dentures, removable partial dentures, shammasm, removable prosthodontics

2. Introduction and
Components of a Removable
Partial Denture

3.  Memorize and recall various
terminologies related to removable
partial dentures.
 List the indications of removable
partial dentures.
 Explain the components of RPD.

4. REMOVABLE
PROSTHODONTICS
 It is devoted to replacement of
missing teeth and contiguous tissues
with prosthesis designed to be
removed by the wearer.
 It includes two disciplines: removable
complete denture prosthodontics and
removable partial denture
prosthodontics.

5. missing teeth and contiguous
tissues

6. TERMINOLOGY

7. REMOVABLE
PROSTHODONTICS
 The branch of prosthodontics
concerned with the replacement of
teeth and contiguous structures for
edentulous or partially edentulous
patients by artificial substitutes
that are readily removable from
the mouth.

8. REMOVABLE PARTIAL
DENTURE PROSTHESIS
Any prosthesis that replaces
some teeth in a partially
dentate arch.
It can be removed from the
mouth and replaced at will.

9. Types of removable partial
dentures
 Interim removable partial dentures
 Transitional removable partial
dentures
 Treatment removable partial
dentures

10.  An interim removable partial
denture is a provisional prosthesis
intended to improve esthetics and
function until a more definitive form
of treatment can be given.

11.  A transitional removable partial denture
may be used when loss of additional
teeth is expected, but immediate
extraction is not advisable.
 Artificial teeth may be added to a
transitional removable partial denture as
natural teeth are extracted.

13.  A treatment denture may be used as a
carrier for treatment material, as a
protective covering for a surgical site, or
as a matrix for soft tissue healing.
 In most instances, treatment dentures
are used along with tissue conditioners.

16.  Interim, transitional, and treatment
prostheses are intended for short-term
applications and should never be used
for prolonged treatment.
 The use of such prostheses over
extended periods may cause irreparable
damage to a patient's remaining teeth,
soft tissues, and bone.

17. Abutment: a tooth, a portion
of a tooth, or that portion of a
dental implant that serves to
support and/or retain a prosthesis.

18. Fixed Partial Denture
Abutments

22.  Retainer: is the portion of a
fixed or removable partial
denture that attaches the
prosthesis to an abutment.

23.  An abutment is part of the patient's oral
cavity (eg, a tooth or implant), while a
retainer is part of the prosthesis.

25.  Retention may be defined as
resistance to displacement away from
the teeth and soft tissues of the
dental arch.

26.  Support may be defined as
resistance to displacement toward
the teeth and soft tissues of the
dental arch.

27.  Stability may be defined as
resistance to displacement in a
mediolateral or anteroposterior
direction.

28. How will you treat this patient?

29. Removable Partial Denture = R.P.D Fixed Partial denture = F.P.D
Implant

31. How will you treat this patient?

32. How will you treat this patient?

33. How will you treat this patient?

34. Indications for
RPD

35.  Long-span edentulous
area: RPD preferred for
longer edentulous spaces.

37.  No abutment tooth
posterior to the edentulous
space: When there is no tooth
posterior to the edentulous
space to act as an abutment, a
RPD is preferred.

38.  Reduced periodontal support for
remaining teeth: In mouths where
bony support for the remaining teeth
has been severely compromised, the
abutments may be unable to support
FPD. In such cases RPD is preferred.

40. Periodontally
weak teeth

41.  Need for cross-arch stabilization:
When stabilization of the remaining teeth
is needed to balance mediolateral and
anteroposterior forces (eg, after treatment
of advanced periodontal disease), cross-
arch stabilization frequently is required.

42.  A fixed partial denture can provide
excellent anteroposterior stabilization,
but limited mediolateral stabilization.
Because removable partial dentures
are bilateral prostheses, cross-arch
stabilization is enhanced.

44. Unilateral RPD
Dangerous
Avoid
aspiration

46.  Excessive bone loss within the
residual ridge: When trauma,
surgery, or abnormal resorptive
patterns have caused excessive
bone loss, a clinician also must deal
with replacement of ridge contours.
A properly contoured RPD will
support the lips and cheeks, and to
reestablish desirable facial contours.

49. Excessive loss of residual bone

51.  Physical or emotional problems
of the patient: The lengthy
preparation and construction
procedures for FPD’s can be
exhausting, especially for patients
with physical or emotional problems.
In many instances, RPD is indicated
to minimize patient-dentist contact
time.

52.  Esthetics of primary concern:
It is often possible to attain a more
pleasing appearance by using a
RPD. This is true when the
practitioner must simulate the
appearance of diastemata, dental
crowding, dental rotation, or
extreme changes in the soft tissue
architecture.

54.  Immediate need to replace
extracted teeth: The replacement
of teeth immediately following
extraction is done using a RPD.

55.  Patient desires: Patients
sometimes insist on removable
prostheses in place of fixed
prostheses (1) to avoid operative
procedures on sound, healthy
teeth; (2) to avoid the placement
of one or more implants; and (3)
for economic reasons.

57. Effects of loss of teeth

58. Components of a RPD
 1. Major connectors
 2. Minor connectors
 3. Rests
 4. Direct retainers
 5. Indirect retainers (CLASS I AND
CLASS II ONLY)
 6. Denture bases
 7. Teeth

59. PARTS OF A RPD

61. 1. Major Connector: that part of
a RPD that joins the components
on one side of the arch to those on
the opposite side.

62. 2. Minor Connector: that
connecting link between the major
connector and the other units of the
prosthesis, such as the clasp,
indirect retainers, occlusal rests, or
cingulum rests.

63. 3. Rests: that unit of a RPD that
rests on a tooth surface to provide
vertical support is called a rest.

64. The prepared surface of an abutment
to receive the rest is called the rest
seat.

65. Rests are designated by the
surface of the tooth prepared to
receive them (occlusal rest,
cingulum rest, and incisal rest).

66. 4. Direct Retainer: that
component of a RPD used to
retain and prevent dislodgment of
the prosthesis.

67. 5. Indirect Retainer: that component
of a RPD that resists rotational
displacement of an extension base away
from the supporting tissues.

69. 6. Denture Base: the part of a
denture that rests on the tissues
and to which teeth are attached.

70. 7. Teeth: Porcelain, acrylic and
metal

71. Questions
?????????
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72. CLASSIFICATION OF
PARTIALLY
EDENTULOUS
ARCHES

73.  Explain about Kennedy’s classification of
partially edentulous arches.
 List Applegate’s rules to govern the
application of Kennedy system.
 Compare between tooth supported and
tooth-tissue supported RPD.

74. There are more than 65,000
combinations of standing
teeth and edentulous spaces
which may be encountered
in each arch.

75. Requirements of an
acceptable method of
classification
The classification of a
partially edentulous arch
should satisfy the following
requirements:

76. 1. It should permit immediate
visualization of the type of
partially edentulous arch that
is being considered.
2. It should permit immediate
differentiation between the
tooth-supported and tooth-
tissue supported RPD.

77. 3. Serve as a guide to the
type of design to be used.
4. It should be universally
acceptable.

78. Dr. Edward Kennedy proposed
this classification in 1923 and is
the most popular classification.
This system is based on the
relationships of the edentulous
spaces to the abutment teeth.
Kennedy's Classification

79. Class I
Bilateral
edentulous
areas located
posterior to the
remaining
natural teeth.

80. Class II
A Unilateral
edentulous
area located
posterior to
the
remaining
natural
teeth.

81. Class III
A Unilateral
edentulous
area with
natural teeth
remaining both
anterior and
posterior to it.

82. Class IV
A single, but
bilateral
(crossing the
midline),
edentulous area
located anterior
to the remaining
natural teeth.

83.  Class I arches are most common
while class IV arches were least
common.

84. Modification spaces
 Each Kennedy classification, except
Class I, refers to a single edentulous
area. Additional areas of edentulism
may occur within a dental arch.
Kennedy referred to each additional
edentulous area—not each additional
missing tooth—as a modification
space.

85.  Dr Kennedy included the number
of modification areas in the
classification (eg, Class I,
Modification 1; Class II,
Modification 3).

86.  While the Kennedy system provided a
method for classification of partially
edentulous arches, there was some
uncertainty regarding its application.
In 1954, Dr O. C. Applegate provided
the following rules to govern
application of the Kennedy system:
Applegate’s rules – to govern the
application of Kennedy system

87. Applegate’s rules for classification
Rule 1: Classification should
follow rather than precede
extractions that might alter the
original classification.

89. Rule 2: If the 3rd
molar is
missing and not to be replaced,
it is not considered in the
classification.

91.  Rule 3: If a 3rd
molar is present
and is to be used
as an abutment, it
is considered in
the classification.

92.  Rule 4: If a 2nd
molar is missing
and is not to be
replaced, it is not
considered in the
classification.

93. Rule 5: The
most posterior
edentulous
area(s) always
determines the
classification.

94. Rule 6: Edentulous areas
other than those
determining the
classification are referred to
as modification spaces and
are designated by their
number.

95. Modification areas

96. Modification areas

97. Rule 7: The extent of the
modification is not
considered, only the
number of additional
edentulous areas.

99. Rule 8: There
can be no
modification
areas in class
IV arches.

100. A- CL IV
B- CL II MOD
2
C- CL I MOD
1
D- CL III MOD
3
E- CL III MOD
1
F- CL III MOD
1
G- CL IV
H- CL II
I- CL III MOD
6

101. Tooth supported RPD
A partial denture
that receives
support from the
natural teeth at each
end of the
edentulous space.
Also called as
bounded saddle.

102. Tooth supported RPD

103. Tooth-tissue supported RPD
The denture base that
extends posteriorly
and is supported by
teeth at one end only.
Also called distal
extension partial
dentures or free end
saddle.

104. Tooth-tissue supported RPD

105. Questions
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