The document discusses various developmental disturbances that can affect teeth, including disturbances in size, shape, number, structure, and growth. Regarding size, it describes microdontia (small teeth) and macrodontia (large teeth). Shape disturbances covered include gemination (attempted division of a tooth germ), fusion (union of two tooth germs), concrescence (fusion by cementum after root formation), and dilaceration (sharp bend in a tooth). Other shape anomalies discussed are talon cusp, dens in dente, and dens evaginatus. The document also briefly outlines number, structure, and growth disturbances.
2. Developmental disturbances of
teeth
Size of teeth
Shape of teeth
Number of teeth
Structure of teeth
Growth (Eruption) of teeth
08/08/14 2BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
3. D-D in size of teeth
Microdontia
Macrodontia
08/08/14 3BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
4. D-D in shape of teeth
Gemination
Fusion
Concrescence
Dilaceration
Talon cusp
Dens in dente
Dens evaginatus
Taurodontism
Supernumerary roots
08/08/14 4BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
5. D-D in number of teeth
Anodontia
Supernumerary teeth
Pre-deciduous dentition
Post-permanent dentition
08/08/14 5BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
9. Microdontia
It is described as teeth which are smaller than
normal i.e. outside the usual limits of variation.
Three types:
• True generalized
• Relative generalized
• Involving a single tooth
08/08/14 9BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
10. Microdontia
True generalized type:
• All the teeth are smaller than normal.
• Exceedingly rare.
• Teeth are well formed but small in size.
• Seen in Pituitary dwarfism, Down’s syndrome.
08/08/14 10BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
12. Microdontia
Relative generalized type:
• Normal or slightly smaller than normal teeth.
but the jaws are somewhat larger than normal
– impression of microdontia.
• Inheritance of jaw size from one parent and
tooth size from other parent can lead to this
variations.
08/08/14 12BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
13. Microdontia
Involving a single tooth:
• Also called localized microdontia.
• Rather common.
• Affects mostly the maxillary lateral incisor and third
molars (Congenitally missing teeth too).
• Supernumerary teeth are frequently small in size.
• Can be seen in Facial Hemiatrophy.
08/08/14 13BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
15. Microdontia
Common form in lateral incisors – PEG
laterals.
• The mesial and distal surfaces converge or taper
incisally forming a peg-shaped or cone-shaped crown.
• The roots are frequently shorter than normal.
08/08/14 15BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
17. Macrodontia
It refers to teeth that are larger than normal.
Also called Megalodontia or megadontia.
Three types:
• True generalized macrodontia
• Relative generalized macrodontia
• Macrodontia of single teeth
08/08/14 17BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
18. Macrodontia
True generalized type:
• Extremely rare.
• All the teeth are larger than normal.
• Associated with pituitary gigantism.
08/08/14 18BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
19. Macrodontia
Relative generalized type:
• Some what more common.
• Normal or slightly larger sized teeth in smaller
jaws.
• Hereditary factors.
08/08/14 19BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
20. Macrodontia
Involving a single tooth:
• Relatively uncommon.
• Unknown etiology.
• Tooth may appear normal in every aspect except for
its size.
• Should not confused with fusion of teeth.
• Can be seen in facial hemi-hypertrophy of the face –
the teeth of involved side may be larger than
unaffected side.
08/08/14 20BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
23. Gemination
These are anomalies which arise from an
attempt at division of single tooth germ by
invagination, with resultant incomplete
formation of two teeth.
Hereditary factors may play a role.
Difficulty to delineate this from fusion of a
normal and supernumerary tooth.
08/08/14 23BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
24. Gemination
Seen in deciduous and permanent teeth.
Structure is one tooth with:
• Two completely or incompletely separated crowns.
• Roots are single with a root canal.
Twinning – designate the production of
equivalent structures by division resulting in
one normal and one supernumerary tooth.
08/08/14 24BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
26. Comparison
Gemination - Defined as a single enlarged
tooth or joined tooth in which the tooth count
is normal, when the anomalous tooth is
counted as one.
Fusion - defined as a single, enlarged tooth
or joined tooth in which the tooth count
reveals a missing tooth, when the anomalous
tooth is counted as one.
08/08/14 26BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
27. Fusion
Fused teeth arise through union of two normally
separated tooth germs.
Could be between two normal teeth or a normal tooth
with a supernumerary tooth like mesiodens or
distomolar.
Fusion may be complete or incomplete based on the
stage of tooth development at the time of fusion.
Physical force or pressure produces contact of
developing teeth and their subsequent fusion.
08/08/14 27BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
30. Fusion
Contact occurs before calcification – two teeth
may be completely united to form a single
large tooth.
• Dentin is confluent in true fusion.
Contact after calcification of the crowns, the
roots may be united.
08/08/14 30BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
32. Fusion
Tooth may have separate or fused root canals.
Common in deciduous as well as permanent
teeth.
Clinical problems include esthetics, spacing
and periodontal conditions.
08/08/14 32BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
33. Concrescence
A form of fusion which occurs after root
formation has been completed.
Teeth are united by cementum only.
Due to:
• Traumatic injury.
• Crowding of teeth with resorption of adjacent
interdental bone – contact of two roots – fused by
cementum deposition.
08/08/14 33BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
35. Concrescence
May occur before or after tooth eruption.
Usually involves two teeth. But a case
involving three teeth has been reported.
Diagnosed by radiographic examination.
Should be noted during extraction procedures.
08/08/14 35BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
36. Histopathology
Deposition of excessive cementum over the
original layer of primary cementum.
May be hypocellular or exhibit areas of cellular
cementum resembling bone called
osteocementum.
Polarized light to differentiate dentin and
cementum.
08/08/14 36BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
37. Factors asso.
Local factors:
• Abnormal occlusal trauma
• Adjacent inflammation
• Unopposed teeth – impacted, embedded, without an
antagonist
08/08/14 37BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
38. Factors asso.
Systemic factors:
• Acromegaly and pituitary gigantism
• Arthritis
• Calcinosis
• Paget’s disease of bone
• Rheumatic fever
• Thyroid goiter
• Vitamin A deficiency
08/08/14 38BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
39. Dilaceration
Refers to an angulation or a sharp bend or
curve, in the root or crown of a formed teeth.
Due to trauma during tooth formation, the
position of calcified portion of the tooth is
changed and the remaining tooth develops at
an angle.
08/08/14 39BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
41. Dilaceration
Dilaceration in a permanent tooth often follows
traumatic injury (avulsion or intrusion) to the
deciduous predecessor in which the tooth is
driven apically into the jaw.
Can also develop secondary to adjacent cyst,
tumor or odontogenic hamartoma.
08/08/14 41BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
42. Dilaceration
The curve or bend can occur anywhere along the
length of the tooth depending on the amount of tooth
formed at the time of injury.
Can be problematic during extractions – need for
pre-operative radiographs.
08/08/14 42BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
43. Talon cusp
An anomalous structure resembling an eagle’s
talon, projects lingually from the cingulum areas of
a maxillary or mandibular permanent incisor.
This cusp blends smoothly with the lingual tooth
surface except for a deep developmental groove.
Composed of normal enamel, dentin and a horn of
pulp tissue.
08/08/14 43BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
46. Talon cusp
Clinical problems include esthetics, caries
control and occlusal accomodation.
Quite uncommon among the general
population.
May be seen in other somatic and odontogenic
anomalies.
08/08/14 46BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
47. Talon cusp
More prevalent in Rubinstein – Taybi
syndrome.
• Developmental retardation.
• Broad thumbs and great toes.
• Characteristic facial features.
• Delayed or incomplete descendence of testes in males.
• Stature, head circumference and bone age below the 15th
percentile.
08/08/14 47BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
48. Dens in dente
Also called Dens invaginatus, Dilated
composite odontome.
Is a developmental variation thought to arise
as a result of invagination in the surface of a
tooth crown before calcification has occurred.
08/08/14 48BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
49. Dens in dente
Fairly common and extreme variations in
clinical presentation.
The term was initially applied to a severely
invaginated tooth which appeared
radiographically as a tooth within a tooth – it is
a misnomer but continued to be used.
08/08/14 49BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
50. Dens in dente
Caused could be:
• Increased localized external pressure
• Focal growth retardation
• Focal growth stimulation
(in certain areas of the tooth bud)
08/08/14 50BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
51. Dens in dente
Permanent maxillary lateral incisors are most
frequently involved and sometimes, the maxillary
central incisor and some posterior teeth.
Frequently bilateral.
Radicular variety with a radicular invagination results
from infolding of hertwig’s sheath and origin is within
the root after development is complete.
08/08/14 51BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
54. Dens in dente
Mild form – has an accentuation/deep
invagination in the lingual pit area.
Radiographs reveal a pear shaped
invagination of enamel and dentin with a
narrow constriction at the opening on the
surface of the tooth and closely
approximating the pulp in its depth.
Severe form – an invagination that extends
nearly to the apex of the root.
08/08/14 54BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
56. Dens in dente
Food debris can accumulate leading to
caries and pulpal infection.
Bizarre radiographic picture with severe
disturbance in the normal anatomic and
morphologic structure of the teeth.
It should be recognized early and restored
prophylactically. It could be detected in
radiographs even before the tooth erupts.
08/08/14 56BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
57. Dens evaginatus
Also called Leong’s premolar, Evaginated
odontome.
It is a developmental condition that appears
clinically as an accessory cusp or a globule of
enamel on the occlusal surface between the
buccal and lingual cusps of premolars,
unilaterally or bilaterally.
08/08/14 57BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
58. Dens evaginatus
Occurs in persons of mongoloid ancestry –
chinese, japanese, filipinos, eskimos and
american-indians.
Evolves by proliferation and evagination of an
area of the inner enamel epithelium and
subjacent odontogenic mesenchyme into the
dental organ during early tooth development.
08/08/14 58BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
59. Dens evaginatus
May physically resemble talon cusp.
Extra cusp can lead to:
• Incomplete eruption
• Displacement of teeth
• Pulp exposure following occlusal wear or fracture.
08/08/14 59BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
61. Shovel shaped incisors
Predominantly in asians, native americans and
alaskans.
Affects maxillary central and lateral incisors.
Has prominent lateral margins creating a hollowed
lingual surface resembling the scoop of a shovel.
Thickened marginal ridges converge at the cingulum.
There is a deep pit, fissure or dens invaginatus at this
junction.
08/08/14 61BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
62. Taurodontism
Originated by Sir Arthur Keith in 1913 to describe a
dental anomaly in which the body of the tooth is
enlarged at the expense of the roots.
Means bull-like tooth as it is similar to teeth in ungulate
or cud-chewing animals.
It is an enlargement of the body and pulp chamber of a
multi-rooted tooth with apical displacement of the
pulpal floor and bifurcation of the roots.
08/08/14 62BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
63. Taurodontism
Shaw classified it as,
• Hypotaurodont – mildest form
• Mesotaurodont – moderate
• Hypertaurodont – severe form with furcation
near the apices of the roots.
08/08/14 63BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
64. Taurodontism
Causes enumerated by Mangion are:
• Primitive pattern
• Mutation resulting from odontoblastic deficiency during
dentinogenesis of the roots.
Could be due to failure of Hertwig’s epithelial
sheath to invaginate at the proper horizontal
level.
Appears to be genetically controlled and
familial in nature.
08/08/14 64BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
65. Taurodontism
Associated in Neanderthal man.
Occur concomitantly with amelogenesis
imperfecta - hypomaturation-hypoplastic
variety.
Reported in Klinefelter’s syndrome.
08/08/14 65BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
67. Taurodontism
Affect either deciduous or permanent teeth
(more common in permanent teeth).
Usually molars – single/multiple.
Unilateral or bilateral involvement.
No unusual morphology.
08/08/14 67BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
68. Taurodontism
Affected teeth tend to be rectangular in shape.
Pulp chamber is extremely large with greater
apico-occlusal height.
Pulp lacks the usual cervical constriction.
Roots are extremely short.
Furcation near the apices of the roots.
08/08/14 68BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
70. Syndromes asso.
AI – Type IE, IV
Ectodermal dysplasia
Hyper/Hypo phosphatasia
Klinefelter syndrome
Oculo-dental-digital dysplasia
Tricho-dento-osseous syndrome
Down’s syndrome
Sex chromosomal aberrations
08/08/14 70BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
71. Supernumerary roots
Refers to the development of an increased number of
roots on a tooth compared with that described in dental
anatomy.
May involve any tooth.
Mandibular cuspids and bicuspids may have two roots.
Maxillary and mandibular molars may exhibit additional
roots.
Significant during extraction.
08/08/14 71BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
73. Ectopic enamel
Refers to the presence of enamel in unusual
locations, mainly in the roots of teeth.
Widely known as enamel pearls.
Project from the surface of the root.
08/08/14 73BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
74. Ectopic enamel
Hemispheric structures that consist of,
• Entirely of enamel
• Enamel, dentin and pulp tissue.
Thought to arise from localized bulging in the
odontoblastic layer with prolonged contact between
HERS and dentin leading to enamel formation.
Cervical enamel extensions also occur along the root
surface.
08/08/14 74BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
76. Cervical enamel extensions
Located on the buccal surface of the root
overlying the bifurcation.
Affects the mandibular molars.
Greater prevalence in asians.
08/08/14 76BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
77. Cervical enamel extensions
Correlated with localized loss of periodontal
attachment with furcation involvement.
Associated with development of inflammatory
cysts – Buccal bifurcation cysts.
08/08/14 77BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
80. Anodontia
True anodontia – congenital absence of teeth.
• Total
• Partial
Induced or false anodontia – as a result of
extraction of all teeth.
Pseudo-anodontia – applied to multiple,
unerupted teeth.
08/08/14 80BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
81. Total anodontia
It is a rare condition in which all the teeth are
missing.
May involve both deciduous and permanent
dentition.
Frequently associated with hereditary
ectodermal dysplasia.
08/08/14 81BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
82. True partial anodontia
Also called
• Hypodontia – lack of development of one or more
teeth.
• Oligodontia - Lack of development of six or more
teeth.
Is a common condition involving one or more
teeth.
Any tooth can be congenitally missing.
08/08/14 82BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
84. True partial anodontia
Etiology:
• Familial tendency – point mutations transmitted in
autosomal dominant pattern.
• Missing third molars could be an evolutionary trend
towards fewer teeth.
• It is associated with hereditary ectodermal dysplasia.
• Xray radiation of face during early age – affecting the
sensitive tooth buds.
08/08/14 84BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
85. True partial anodontia
Frequently involved teeth are,
• Third molars (all the 4 may be missing)
• Maxillary lateral incisors
• Maxillary and mandibular second premolars
Bilateral involvement is also seen.
08/08/14 85BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
87. True partial anodontia
In severe partial anodontia - there is bilateral
absence of corresponding teeth.
In hereditary ectodermal dysplasia – few teeth
that are present may be deformed or cone
shaped.
08/08/14 87BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
88. True partial anodontia
Congenitally missing deciduous teeth is an uncommon
condition.
Usually involves,
• Maxillary lateral incisors
• Mandibular lateral incisors
• Mandibular cuspids
The term partial anodontia should be avoided as by
Allen.
08/08/14 88BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
89. Syndromes asso.
Ankyloglossia superior
Crouzon
Down
Ectodermal dysplasia
Ehlers danlos
Hurlers
Sturge-weber
Turner
Incontinentia pigmenti
Ellis von creveld
08/08/14 89BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
90. Hyperdontia
Development of an increased number of teeth
and the additional teeth are termed as
Supernumerary teeth.
08/08/14 90BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
91. Supernumerary teeth
It may closely resemble the teeth of the
belonging group – molars, premolars or
incisors.
It may have no resemblance in size and shape
to the associated tooth.
08/08/14 91BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
94. Supernumerary teeth
It develops from a third tooth bud arising form
the dental lamina near the permanent tooth
bud.
Arises by splitting of the permanent bud itself
(unlikely as the associated permanent tooth is normal in all
aspects).
Hereditary tendency.
08/08/14 94BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
95. Supernumerary teeth
Multiple SN teeth is seen in,
• Cleido-cranial dysplasia
• Gardner’s syndrome – the impacted teeth may lead
to early diagnosis of entire syndrome (malignant
transformation of intestinal polyps).
Most of these SN teeth are frequently
impacted.
08/08/14 95BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
96. Supernumerary teeth
May be found in any location.
90% of occurrence is in the maxilla.
May be erupted or impacted.
08/08/14 96BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
97. Mesiodens
Most common supernumerary tooth.
It is situated between the maxillary central
incisors.
It occurs as,
• Single or paired.
• Erupted or impacted or inverted.
08/08/14 97BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
99. Mesiodens
It is a small tooth with a cone shaped crown
and a short root.
High incidence in caucasian population with
2:1 male predilection (Transmitted as an
autosomal dominant trait).
08/08/14 99BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
100. Fourth molar
Second most common supernumerary tooth.
Situated distal to the third molar.
Usually small, rudimentary tooth but may be of
normal size.
Maxillary 4th
molar is more common than
mandibular 4th
molar.
An accessory fourth molar is called Distomolar
or distodens.
08/08/14 100BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
103. Paramolars
Paramolar is a supernumerary molar,
• Situated buccally or lingually to one of the maxillary
molars.
• Inter-proximally between the first and second molars
• Inter-proximally between second and third molars.
Usually small and rudimentary.
08/08/14 103BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
104. Dental transposition
Normal teeth erupting into an inappropriate
position.
Usually involves the canine and first
premolars.
Canine erupting between two premolars.
Could be confused with supernumerary teeth.
08/08/14 104BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
106. Pre-deciduous dentition
Infants born with structures appearing to be
erupted teeth in the mandibular incisor region.
Arising from,
• An accessory bud of the dental lamina ahead of the
deciduous tooth bud.
08/08/14 106BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
107. Pre-deciduous dentition
Described as hornified, epithelial structures
without roots.
Occurs in the gingiva over the crest of the
ridge
May be easily removed.
08/08/14 107BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
108. Pre-deciduous dentition
Differentiated from true deciduous teeth or natal teeth
described by Massler – which erupts at the time of
birth.
Some consider it as a misinterpretation of dental
lamina cysts of new born,
• Projects above the crest of the ridge.
• White in color.
• Packed with keratin – hornified appearance.
• Easily removed.
08/08/14 108BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
109. Post-permanent dentition
In persons who had all their permanent teeth
extracted and yet had subsequently erupted
several more teeth particularly after insertion of
complete denture.
Majority is due to delayed eruption of retained
or embedded teeth.
08/08/14 109BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
110. Post-permanent dentition
Some may represent post-permanent or third
dentition.
But they are actually, multiple supernumerary
unerupted teeth.
It probably develops from a bud of the dental
lamina beyond the permanent tooth germ.
08/08/14 110BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
112. Environmental alterations
Developmental tooth defects
Post developmental structure loss
Discolorations of teeth
Localized disturbances in eruption.
08/08/14 112BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
113. Environmental enamel hypoplasia
Defined as incomplete or defective formation
of the organic enamel matrix of the teeth.
Two types:
• Hereditary – AI
• Caused by environmental factors
08/08/14 113BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
115. Factors associated with enamel
defects
Local factors:
• Local acute mechanical trauma
• Electric burn
• Irradiation
• Local infection
08/08/14 115BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
116. Environmental enamel hypoplasia
Hereditary Environmental
Both deciduous and
permanent teeth are
affected.
Either dentition may be
involved. Sometimes, only a
single tooth.
Only enamel is affected. Both enamel and dentin are
involved.
08/08/14 116BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
117. Amelogenesis imperfecta
Also called hereditary enamel dysplasia, hereditary
brown enamel, hereditary brown opalescent teeth.
It represents a group of hereditary defects of enamel
unassociated with any other generalized defects.
It is entirely an ectodermal disturbance and the
mesodermal components of the teeth are basically
normal.
08/08/14 117BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
118. Amelogenesis imperfecta
In normal development of enamel, three stages can be
appreciated,
• Formative stage – deposition of organic matrix – defective –
Hypoplastic AI.
• Calcification stage – matrix mineralization – defective –
Hypocalcification (Hypomineralization) AI.
• Maturation stage – Crystallites mature and enlarge –
defective – Hypomaturation AI (immature crystallites).
08/08/14 118BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
119. Clinical features
By Witkop and Sauk,
• Hypoplastic – enamel is not formed to full, normal
thickness on newly erupted, developing teeth.
• Hypocalcified – enamel is so soft that it can be
removed by prophylaxis instrument.
• Hypomaturation – enamel can be pierced by an
explorer point under firm pressure and can be lost by
chipping off from the underlying normal dentin.
08/08/14 119BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
122. Clinical features
Extremely variable, clinical presentation.
All teeth of both dentitions affected to some degree.
Crowns may show discoloration varying from yellow to
dark brown.
08/08/14 122BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
123. Clinical features
Enamel may be totally lost or have chalky texture
or cheesy consistency or relatively hard.
Enamel may be smooth or show vertical wrinkles
or grooves.
May be chipped or show depressions with
exposed dentin at its base.
Contact points are open
Occlusal and incisal edges are severely abraded.
08/08/14 123BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
126. Radiographic features
Overall shape of the tooth may not be normal
depending on the,
• Amount of enamel present
• Amount of occlusal and incisal wear
Enamel may be totally absent or seen only on
the cusp tips and inter-proximal surfaces.
It may have similar radiodensity to dentin.
08/08/14 126BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
127. Histologic features
Disturbance in the differentiation and viability
of ameloblasts in hypoplastic type – seen as
defective matrix formation – even total
absence of matrix.
Hypocalcification type shows defects in matrix
structure and mineral deposition.
Hypomaturation type shows alterations in
enamel rods and rod sheath structures.
08/08/14 127BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
128. Hypoplastic/Hypomaturation AI
Has enamel hypoplasia in combination with
hypomaturation.
Both the dentition are affected.
Two patterns based on thickness of enamel
and overall tooth size.
08/08/14 128BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
129. Hypomaturation - Hypoplastic
Enamel hypomaturation is the dominant
feature.
Enamel is yellowish-white to yellowish-brown.
Pits are seen on buccal surface.
Enamel is similar to dentin in density.
Large pulp chambers with varying degrees of
taurodontism.
08/08/14 129BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
130. Hypoplastic - Hypomaturation
Enamel hypoplasia is the dominant feature.
Enamel is thin.
Other features is similar to the forementioned
type.
08/08/14 130BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
131. Tricho-dento-osseous syndrome
Autosomal dominant disorder.
Shows hypoplastic-hypomaturation AI with severe
taurodontism.
Kinky hair at birth which may straighten with age.
Osteosclerosis of the base of skull and mastoid
process.
Mandible exhibits shortened ramus and an obtuse
angle.
Brittle nails.
08/08/14 131BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
132. Environmental enamel hypoplasia
It occurs only when the injury occurs during the
development or more specifically, formative
stage of enamel.
Once the enamel is calcified, no such defect
can be produced.
By correlating the chronology and location of
the defect, the approximate time of injury could
be predicted.
08/08/14 132BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
133. Causes
Nutritional deficiency – Vitamins A, C, D
Exanthematous diseases – Measles, Chicken pox,
Scarlet fever
Congenital syphilis
Hypocalcemia
Birth injury, prematurity, Rh hemolytic disease
Local infection or trauma
Ingestion of chemicals – fluoride
Idiopathic causes.
08/08/14 133BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
134. Clinical features
Mild cases – few small grooves, pits or fissures
on the enamel surface.
Severe – rows of deep pits arranged
horizontally across the surface of the tooth.
Several rows indicate series of injuries.
Most severe – enamel may be absent.
08/08/14 134BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
135. Hypoplasia due to nutritional factors
and exanthematous fevers
Rickets at the time of tooth formation is the
most common cause.
Serious nutritional deficiency or systemic
disease is potentially capable of producing
enamel hypoplasia as the ameloblasts are one
of the most sensitive groups in terms of
metabolic function.
08/08/14 135BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
136. Hypoplasia due to nutritional factors
and exanthematous fevers
Most cases involve teeth that form within the first year
after birth.
Maxillary central and lateral incisors, cuspids (tip of
cuspids forms before the lateral incisor) and first molars are
frequently affected.
Premolars, 2nd
and 3rd
molars are seldom affected –
formation is 3 years or later.
Decay progresses rapidly in hypoplastic teeth.
08/08/14 136BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
137. Hypoplasia due to congenital
syphilis
Has a characteristic, pathognomonic appearance.
Involves the maxillary and mandibular permanent
incisors and first molars.
Anteriors – “Hutchinson’s teeth”
Posteriors – “Mulberry molars, Moon’s molars,
Fournier’s molars”.
08/08/14 137BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
138. Clinical features
Upper central incisor is screw-driver shaped.
Mesial and distal surfaces of the crown tapers and
converges towards the incisal edge of the tooth.
Incisal edge is usually notched – could be due to
the absence of central tubercle or calcification
center.
08/08/14 138BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
140. Clinical features
Crowns of first molars are irregular.
Enamel of the occlusal surface and occlusal third
of the tooth appears to be an agglomerate mass of
globules.
Crown is narrower on the occlusal surface than at
the cervical margins.
All the patients do not exhibit dental findings.
08/08/14 140BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
142. Hypoplasia due to hypocalcemia
Tetany - due to reduction in blood level of
calcium – due to vitamin D deficiency and
hypo-parathyroidism.
Calcium level falls to 6-8mg/dl and can affect
the devloping tooth.
Hypoplasia is of the pitting variety.
08/08/14 142BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
143. Hypoplasia due to birth injuries
Neonatal line or ring – described by Schour(1936) is
present in deciduous teeth and first permanent molars.
Considered as a hypoplastic defect in enamel and
dentin due to trauma or environmental change at the
time of birth.
More common in premature infants and in Rh
hemolytic diseases.
Can even involve prenatal enamel – due to GI
disturbances or other illnesses in the mother.
08/08/14 143BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
144. Hypoplasia due to local trauma
or infection
Only a single tooth is involved – permanent
maxillary incisors or maxillary/mandibular
premolar.
Single teeth are frequently referred as Turner’s
teeth and the condition is called as Turner’s
hypoplasia.
Mild, brownish discoloration to severe pitting.
08/08/14 144BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
145. Hypoplasia due to local trauma
or infection
The periapical infection of a carious deciduous
tooth can disturb the developing ameloblastic
layer of the succeeding permanent tooth
producing hypoplastic crown.
Severity of the hypoplasia depends on the,
• Severity of the infection
• Degree of tissue involvement
• Stage of permanent tooth development at the time of
infection.
08/08/14 145BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
146. Hypoplasia due to local trauma
or infection
Similar hypoplasia can follow trauma to the
deciduous tooth when the tooth is driven into the
alveolus and damages the developing permanent
successor.
Usually affects the labial surface of maxillary
anteriors.
Seen as yellowish or brownish stain or pigmentation
of enamel on the labial surface or as a pitted
hypoplasia.
Could be due to disturbance in matrix formation or
calcification.
08/08/14 146BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
147. Hypoplasia due to trauma
08/08/14 147BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
148. Hypoplasia due to anti-
neoplastic therapy
Secondary changes due to therapeutic
radiation or chemotherapy.
Under the age of 5 years.
Hypodontia, microdontia, radicular hypoplasia
and enamel hypoplasia.
Reduced alveolar bone development.
08/08/14 148BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
149. Hypoplasia due to fluoride –
Mottled enamel
Variety of enamel hypoplasia.
First described by G.V. Black and
Frederick.S.Mckay in 1916 – Colarado brown
stain.
Exhibited a geographic distribution and due to
the water supply.
Later, the causative agent was found to be
flourine.
08/08/14 149BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
150. Etiology
Ingestion of fluoride containing drinking water
during the time of tooth formation.
Severity of hypoplasia increases with
concentration of fluoride in water.
Little mottling at 0.9 to 1.0 ppm of Fluoride.
08/08/14 150BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
151. Pathogenesis
Due to disturbance of ameloblasts during the formative
stage of tooth development.
Exact nature of cell injury is not known but the enamel
matrix is defective or deficient.
Findings may be related to individual variations to
fluoride intake.
High levels of fluoride interferes with calcification of the
matrix.
08/08/14 151BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
152. Clinical features
Questionable changes - white flecks or
spotting of enamel.
Mild changes – white, opaque areas involving
more of tooth surface.
Moderate and severe changes – pitting and
brownish staining of the surface. Tendency of
enamel to wear or fracture.
Corroded surface of the affected teeth.
08/08/14 152BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
155. Intrinsic stains
Congenital erythropoietic porphyria – reddish
brown – red fluorescence under Wood’s light.
Alkaptonuria – bluish black – asso. with
Ochronosis
Hyperbilirubinemia in erythroblastosis fetalis,
biliary atresia – green discoloration –
cholorodontia.
Tetracycline – bright yellow to dark brown –
bright yellow fluorescence in uv light.
08/08/14 155BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
158. Dentinogenesis imperfecta
Called Hereditary opalescent dentin, Capdepont’s
teeth.
Only the mesodermal portion of the odontogenic
apparatus is affected.
Dentin is defective.
Could be due to hereditary factors
Can be seen in association with osteogenesis
imperfecta.
08/08/14 158BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
159. Classification by Shields
Type I – DI that always occur with OI – autosomal
dominant.
Type II – DI that never occurs with OI – hereditary
opalescent dentin – autosomal dominant – 1 in
8000.
Type III – DI – Brandy wine type – similar to I and
II along with multiple pulp exposures in deciduous
teeth – autosomal dominant.
08/08/14 159BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
160. Clinical features
Varied presentations.
Deciduous teeth are more severely affected in
Type I.
Both the dentitions are equally affected in Type
II and III.
Gray to brownish violet or yellowish brown with
a characteristic translucent or opalescent hue.
08/08/14 160BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
162. Clinical features
Enamel may be lost early on incisal and
occlusal surfaces due to the abnormal DEJ.
DEJ lacks the usual scalloping.
Dentin is attrited rapidly.
Occlusal surfaces of affected teeth are
severely flattened.
08/08/14 162BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
165. Radiographic features
Total or partial obliteration of the pulp chambers and
root canals by continued formation of dentin in Type I
and II.
Seen in both dentitions.
Roots may be short and blunted.
The cementum, alveolar bone and periodontal bone
appear normal.
08/08/14 165BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
166. Radiographic features
Type III shows marked variation.
Witkop describes it as Shell teeth.
Originally described by Rushton as a dentinal
disturbance with normal enamel, extremely thin dentin
and enormous pulp chambers.
Roots are extremely short.
08/08/14 166BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
167. Histologic features
Type I and II emphasizes a pure mesodermal
disturbance. Type III is not adequately documented.
The enamel is normal in appearance.
Dentin has irregular tubules with large areas of
uncalcified matrix.
Tubules are larger in diameter and lesser in number.
08/08/14 167BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
168. Physical and chemical features
Water content is increased – 60% above
normal.
Inorganic content is less than that of normal
dentin.
Density, Xray absorption and hardness of
dentin is low.
Micro-hardness of dentin is close to
cementum – rapid attrition.
08/08/14 168BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
169. Histologic features
Cellular inclusions probably odontoblasts can be seen
in dentin.
The odontoblasts with limited ability to form well-
organized dentinal matrix, appear to degenerate
readily and get entrapped within the matrix.
Pulp chamber is obliterated by continuous dentin
deposition.
08/08/14 169BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
170. Dentin dysplasia
Called Rootless teeth.
Rare disturbance in dentin formation characterized by
normal enamel but atypical dentin formation with
abnormal pulp morphology.
First described by Ballschmiede (1920) – spontaneous
exfoliation of multiple teeth.
Rushton (1939) designated it as dentin dysplasia.
08/08/14 170BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
171. Classification
Shields:
• Type I – dentin dysplasia
• Type II – anomalous dysplasia of dentin
Witkops:
• Type I – Radicular dentin dysplasia – More common.
• Type II – Coronal dentin dysplasia
08/08/14 171BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
173. Clinical features
Radicular DD
Both dentitions are
affected.
Appear clinically normal
in morphology and color.
Slight amber
translucency.
Normal eruption pattern.
Extreme mobility of teeth
and premature exfoliation
due to abnormally short
roots.
Coronal DD
Both dentitions are
affected.
Deciduous teeth are
yellow, brown or bluish-
grey opalescent
appearance as DI.
Permanent dentition is
normal.
In both dentitions, roots are short, blunt, conical or similarly malformed.
08/08/14 173BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
177. Radiographic features
Radicular DD
Pulp chambers and root
canals are completely
obliterated in deciduous teeth.
Crescent shaped pulpal
remnant in the pulp chamber
of permanent teeth.
Obliteration of permanent
teeth occurs pre-eruptively.
Periapical radiolucencies of
apparently, intact teeth.
Coronal DD
Pulp chambers of deciduous
teeth are obliterated.
Permanent teeth shows
abnormally, large pulp
chamber in the coronal
portion of the tooth – thistle
tube in shape. Radio-opaque
foci resembling pulp stones
may be found.
Obliteration does not occur
before eruption.
Periapical radiolucencies do
not occur.
08/08/14 177BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
178. Histologic features
Radicular DD
A portion of coronal dentin is
usually normal.
Pulp is obliterated by calcified,
tubular dentin, ostodentin and
fused denticles.
Normal dentinal tubule
formation appears to be
blocked and dentin forms
around obstacles – Lava
flowing around boulders.
EM – cascades of dentin due
to repeated attempts of root
formation.
Coronal DD
Coronal dentin is relatively
normal.
Deciduous teeth shows
amorphous and atubular
dentin in the radicular
portion.
Permanent teeth has
multiple pulp stones or
denticles.
08/08/14 178BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
179. Dentin dysplasia
Systemic diseases with DD like alterations are
• Calcinosis universalis
• Rheumatoid arthritis
• Vitaminosis D
• Sclerotic bone
• Skeletal anomalies
• Tumoral calcinosis
08/08/14 179BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
180. Fibrous dysplasia of dentin – DD I
Autosomal dominant disorder
Clinically normal teeth
Has a radio-dense, intra-pulpal material (fibrotic dentin)
filling the pulp chambers and canals.
Small foci of radiolucency can be seen in the pulp (D/D
– DI)
No crescent pulp chambers and no decrease in root
length (D/D – DD)
08/08/14 180BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
181. Pulpal dysplasia – DD II
Develops in teeth that are normal clinically.
Affects both dentitions.
Radiographs reveal thistle-tube shaped pulp
chambers and multiple pulp stones.
08/08/14 181BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
182. Regional odontodysplasia
Also called odontodysplsia, odontogenic
dysplasia, Ghost teeth and Odontogenesis
imperfecta.
Unusual dental anomaly in which one or
several teeth in a localized area are affected.
08/08/14 182BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
183. Causes
Somatic mutation
Latent virus residing in the odontogenic epithelium which
becomes active during tooth development.
Local vascular defects.
Abnormal migration of neural crest cells
Local trauma or infection
Hyperpyrexia
Malnutrition
Medications during pregnancy
Radiation therapy
Somatic mutation
08/08/14 183BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
184. Regional odontodysplasia
Maxillary teeth are frequently involved –
permanent incisors and cuspids.
Mandibular anteriors may be affected.
Both the dentitions are affected.
Show a delayed or total failure of eruption.
Irregular in shape with defective mineralization.
08/08/14 184BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
186. Radiographic features
Marked reduction in radiodensity – teeth
assumes a ghost appearance.
Both enamel and dentin appear very thin.
Pulp chamber is extremely large.
08/08/14 186BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
188. Histologic features
Marked reduction in the amount of dentin.
Widening of predentin layer.
Large areas of interglobular dentin.
Irregular trabecular pattern of dentin.
Reduced enamel epithelium around non-erupted teeth
show many irregular, calcified bodies – focal
collections of basophilic enamel like calcifications
called Enameloid conglomerates.
08/08/14 188BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
189. Other pathologies in asso.
Ectodermal dysplasia
Epidermal nevi
Hypophosphatasia
Hydrocephalus
Ipsilateral facial hypoplasia
Neurofibromatosis
Orbital coloboma
Rhesus incompatibility
Vascular nevi
08/08/14 189BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
190. Dentin hypocalcification
Caused by environmental factors affecting
mineralization.
There is failure in the fusion of calcium
globules during mineralization, leaving
interglobular areas of uncalcified matrix.
Globular dentin can be easily detected in
ground and decalcifed sections.
Hypocalcified dentin is softer.
08/08/14 190BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
192. Tooth wear
Termed tooth surface loss – normal
physiologic process that occurs with
aging
4 causes (inter-related)
• Attrition
• Abrasion
• Erosion
• Abfraction
08/08/14 192BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
193. Attrition
Loss of tooth structure caused by tooth
to tooth contact during occlusion and
mastication.
More noticeable with age
If it affects esthetics or function, it must
be considered pathologic.
08/08/14 193BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
194. Attrition
Tooth destruction can be accelerated by,
• Poor quality or absent enamel
• Fluorosis
• Environmental or hereditary enamel hypoplasia
• Dentinogenesis imperfecta
• Premature contacts (Edge to edge
conclusion)
• Intra oral abrasives, erosion and grinding
habits.
08/08/14 194BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
195. Attrition
Can occur in both deci & perm teeth
• Incisal and occlusal surfaces
• Lingual surfaces of maxi antrs
• Labial surfaces of mandi antrs
Seen as large, flat, smooth and shiny
wear facets.
Inter-proximal loss – shortening of arch
length
08/08/14 195BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
196. Attrition
Pulp exposure and dentin sensitivity are
rare
• Slow loss of tooth structure
• Apposition of reparative dentin within the pulp
chamber.
08/08/14 196BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
197. Abrasion
Pathologic loss of tooth structure or
restoration secondary to action of an
external agent.
• Tooth brushing – abrasive paste with
horizontal brushing stroke.
• Pencils, tooth picks, pipe stems, bobby pins,
08/08/14 197BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
198. Abrasion
When tooth wear is accelerated by
chewing an abrasive substance between
opposing teeth, called Demastication.
Has features of both attrition and
abrasion
Caused by chewing tobacco, biting
thread..
08/08/14 198BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
199. Abrasion
Has a variety of patterns depending on the
cause.
Seen as horizontal cervical notches on the
buccal surface of exposed radicular cementum
and dentin
Sharply defined margins with a hard, smooth
surface.
Greatest on prominent teeth – cuspids,
bicuspids and teeth adjacent to edentulous
areas.
08/08/14 199BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
201. Erosion
Loss of tooth structure caused by a chemical
process beyond that associated with bacterial
interaction with the tooth.
Exposure to excessive acid –
• foods/drinks,
• chewable vit.C/aspirin
• Chronic involuntary/voluntary regurgitation
• Industrial environment exposure
Erosion from dental exposure to gastric
secretions is termed perimolysis.
08/08/14 201BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
202. Erosion
Tooth loss does not correlate with functional
wear pattern
Commonly affects facial surfaces of maxi antrs
Shallow, spoon shaped depressions in cervical
portion of the crown
Active erosion reveals a clean, unstained
surface
Inactive sites become stained and discolored.
08/08/14 202BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
203. Erosion
Edges of metallic restorns would be at a higher
level than the tooth structure.
Concave depression of dentin surrounded by
an elevated rim of enamel.
Buccal cusps are replaced by ski-slope like
depressions.
Can proceed rapidly and result in dentinal
sensitivity or pulp exposure.
08/08/14 203BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
204. Erosion
Facial surfaces of maxi antrs – dietary
sources of acid.
Incisal portions of antrs in both arches –
external source.
Palatal surface of antrs, occ surface of
postrs – gastric regurgitation
08/08/14 204BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
205. Abfraction
Loss of tooth structure that results from
repeated tooth flexure caused by occlusal
stresses.
Dentin is able to withstand greater tensile
stress than enamel.
Eccentric occlusal forces – tensile stress
concentrated at cervical fulcrum – flexure can
disrupt the chemical bonds of enamel crystals
– can lose by erosion or abrasion.
08/08/14 205BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
206. Abfraction
Wedge shaped defects limited to the cervical
area of the teeth
Deep, narrow and V shaped
Affect a single tooth with adjacent unaffected
teeth
Almost exclusively on the facial surface
More prevalent in bruxism
Higher freq in mandibular dentition – ling
orientation – more susceptible to tensile
stresses.
08/08/14 206BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
208. Internal and external resorption
Accomplished by cells located in the
dental pulp – internal resorption
Accomplished by cells located in the
periodontal ligament – external
resorption
08/08/14 208BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
209. Internal and external resorption
Internal resorption
Relatively rare.
Follow injury to
pulpal tissues.
Continues as long as
vital pulp tissue
remains.
Usually
asymptomatic.
External resorption
Extremely common
Mostly root
resorption – mild
Susceptibility to
resorption is inherent
for each patient.
08/08/14 209BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
212. C/F
Resorption of dentin/cementum can
occur at any site that contacts vital soft
tissue.
2 main patterns,
• Inflammatory – resorbed dentin replaced by
inflamed granulation tissue,
• Replacement or metaplastic - resorbed dentin
replaced by bone or cementum-like bone.
08/08/14 212BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
213. Inflammatory resorption
More common in cervical areas.
Resorption continues as long as vital
pulp remains.
Coronal pulp is necrotic.
Apical portion remaining vital.
Area of destruction – uniform, well
circumscribed, symmetric radiolucent
enlargement of pulp chamber or canal.
08/08/14 213BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
214. Inflammatory resorption
When it affects the coronal pulp, crown shows
a pink discoloration (Pink tooth of Mummery)
when vascular resorption approaches the
surface.
When it occurs in the canal, original outline of
the canal is lost and a balloon-like radiographic
dilation of canal.
Transient changes occur in traumatized teeth,
recently undergone orthodontic or periodontal
therapy.
08/08/14 214BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
215. Replacement resorption
Mostly involves apical or midportions of the root.
Portions of pulpal dentinal walls are resorbed.
Enlargement of canal is filled with a material that is less
radio-dense than the surrounding dentin.
Partial obliteration of the canal.
Outline of destruction is less defined – moth eaten loss of
tooth structure
If it overlies the pulp canal, retention of unaltered canal
through the area of the defect.
08/08/14 215BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
216. Other clinical entities
External and internal resorption can
present various forms.
Cervical pattern of external resorption id
rapid and called Invasive Cervical
resorption.
Several teeth are involved in Multiple
Idiopathic root resorption.
08/08/14 216BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
217. Histopathology
Inflammatory resorption
Vascular pulp tissue with increased
cellularity and collagenization.
Adjacent to dentin, numerous
multinucleated dentinoclasts
Infl infiltrate has lymphocytes, histiocytes
and PMNs
08/08/14 217BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
218. Histopathology
Replacement resorption
Numerous multinucleated dentinoclasts
Areas of resorption are repaired by deposition
of osteodentin.
Deposits of inflamed granulation tissue and
areas of replacement with woven bone.
Extensive bone replacement can lead to
ankylosis.
08/08/14 218BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
220. Introduction
There is a marked variation in biologic eruption
of deciduous and permanent dentition.
It is difficult to assess when the eruption date
of the given person is outside the limits of the
normal range.
Some cases have extremities of normality and
can be considered as a pathology.
08/08/14 220BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
221. Premature eruption
Deciduous teeth that have erupted into the oral
cavity in infants at birth called Natal teeth.
If it erupts prematurely within the first 30 days
of life, it is Neonatal teeth.
Usually one or two teeth erupt early – often
mandibular deciduous incisors.
08/08/14 221BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
222. Premature eruption
Reason is unknown.
Hormonal influences like hyperthyroidism, adrenal
glands and gonadism, for tooth eruption are also
considered.
These teeth are often well formed, normal in all
aspects but may exhibit mobility.
It should be retained though nursing difficulties
may be experienced.
08/08/14 222BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
223. Premature eruption
Permanent teeth erupt prematurely as a
sequel to the premature loss of deciduous
teeth.
Seen when only a single deciduous teeth is
lost with subsequent eruption of the
succedaneous tooth.
08/08/14 223BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
224. Eruption sequestrum
Anomaly associated with tooth eruption in
children.
Described by Starkey and Shafer.
It is a tiny, irregular spicule of bone overlying
the crown of an erupting permanent molar,
found just prior to or immediately following the
emergence of the tip of the cusps through the
oral mucosa.
08/08/14 224BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
225. Etiology
As the molar teeth erupt through the bone, they can
separate a small osseous fragment from the
surrounding bone similar to a cork screw.
In most cases, the fragment undergoes complete
resorption before eruption.
If the bony spicule is large or the eruption is rapid,
complete resorption cannot occur and hence, it is
observed.
08/08/14 225BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
226. Clinical features
The child may complain of slight soreness in the
area during function.
The spicule directly overlies the central occlusal
fossa but is within the soft tissue.
It may be seen lying in a tiny depression over the
crest of the ridge.
As the tooth erupts, the fragment of bone
completely sequesters through the mucosa and is
lost.
08/08/14 226BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
227. Radiographic features
It can be recognized even before the tooth
eruption.
Seen as a tiny, irregular opacity overlying the
central occlusal fossa but separated from the
tooth itself.
08/08/14 227BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
228. Delayed eruption
In deciduous and permanent teeth, it is difficult to
assess unless a gross variation is present.
Caused by,
• Systemic conditions like rickets, cretinism,
cleidocranial dysplasia.
• Local factors like fibromatosis gingivae.
Treatment of the primary condition may lead to
eruption of the teeth.
08/08/14 228BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
230. Multiple unerupted teeth
Uncommon condition with delayed eruption of teeth.
• Deciduous teeth may be retained or
• Deciduous teeth would be shed but the permanent
teeth would have failed to erupt (Pseudo-
anodontia).
Radiographs may be normal but the eruptive forces
would be lacking.
In association with cleidocranial dysplasia.
08/08/14 230BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
231. Embedded and Impacted teeth
Embedded teeth are individual teeth which are
unerupted usually because of a lack of eruptive force.
Impacted teeth are prevented from eruption by some
physical barrier in the eruption path like,
• Lack of space – crowding, premature loss of deciduous
teeth.
• Rotation of tooth buds.
08/08/14 231BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
232. Embedded and Impacted teeth
Any tooth may be impacted – usually
mandibular third molars (22%), maxillary third
molars (18%) and maxillary cuspids (0.9%),
premolars and supernumerary teeth.
Mandibular teeth are more severely impacted
than maxillary teeth.
08/08/14 232BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
234. Impacted mandibular third molars
Classified based on the position,
• Mesioangular
• Distoangular
• Vertical
• Horizontal
• Inverted
• Deflected buccally or lingually
• Even seen in the lower border of ramus.
08/08/14 234BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
236. Impacted mandibular third molars
It is important to determine whether it is a complete or
partial impaction.
Completely impacted tooth is one which lies completely
within the bone and has no communication with the
oral cavity. It cannot become infected or carious.
Partially impacted tooth is not completely encased in
bone but lies partially in soft tissue. Oral
communication could be through a periodontal pocket
leading to infection or carious involvement.
08/08/14 236BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
237. Impacted maxillary teeth
Maxillary third molars can show similar variations of
mandibular third molars.
Maxillary cuspids can be impacted from horizontal to
vertical directions.
Horizontally impacted teeth may impinge on the roots
of anteriors or premolars.
It can be placed labially or palatally.
08/08/14 237BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
238. Complications
Infection
Resorption of adjacent roots.
Periodic pain and even trismus.
Referred pain from impacted tooth.
Dentigerous cyst and ameloblastomatous change.
May undergo resorption from the crown and gets
replaced by bone.
08/08/14 238BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
240. Ankylosed deciduous teeth
Also called Submerged teeth, Infraocclusion,
Secondary retention, Submergence, Reimpaction
and Reinclusion.
Usually deciduous mandibular second molars with
variable degree of root resorption can become
ankylosed to bone.
08/08/14 240BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
241. Ankylosed deciduous teeth
This prevents exfoliation and subsequent
replacement by permanent teeth.
After the eruption of adjacent teeth, these
ankylosed teeth appears to be submerged from
the level of occlusion.
08/08/14 241BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
242. Ankylosed deciduous teeth
The submerged appearance could be due to
• Continued growth of the alveolar process
• Crown height of deciduous tooth is less than
that of adjacent permanent teeth.
It has a solid sound on percussion when compared
to the dull, cushioned sound of normal teeth.
08/08/14 242BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
245. Ankylosed deciduous teeth
Even with extreme root resorption, teeth lack
mobility.
Diagnosis is suspected clinically and confirmed
with radiographs.
There is partial absence of the periodontal
ligament with areas of apparent blending between
the root of the tooth and alveolar bone.
08/08/14 245BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}
246. Complications
Development of malocclusion
Local periodontal disturbance
Dental caries of both the ankylosed tooth and
adjacent teeth.
08/08/14 246BY DR. AATISH PAWAR M.D.S
{ORAL PATHOLOGY}