1. OCCLUSION
IN
PROSTHODONTICS
Dr. Aeysha Siddika
FCPS (Trainee)
Department of prosthodontics
Faculty of Dentistry
BSMMU

2. OCCLUSION
The static relationship between the
incising or masticating
surfaces of the maxillary or mandibular
teeth or tooth
analogues.

3. MUTUALLY PROTECTED OCCLUSION
An occlusal scheme in which the posterior teeth
prevent excessive contact of the anterior teeth
in maximum intercuspation, and the anterior
teeth disengage the posterior teeth in all
mandibular excursive movements.
CENTRIC POSITION PROTRUSIVE POSITION LATERAL POSITION
Working Nonworking
Only posterior tooth make
contact.
Anterior tooth have a
space of minimum 30
microns.
Canine and posterior teeth
disclude .
Mesial inclines of
mandibular first premolar
buccal cusps may contact.
Maxillary
canine
guide the
mandible.
Posterior
teeth
disclude.
No tooth
contacts.

4. MUTUALLY PROTECTED OCCLUSION
In lateral position, working side In protrusive position

5. ADVANTAGES OF MUTUALLY
PROTECTED OCCLUSION
1) Minimum amount of tooth contact is
involved and this makes for better
penetration of the food.
2) The force is closer to the long axis of each
tooth.
3) The arrangement of the marginal, transverse
and oblique ridges so that they have a
shearing action, which makes for a much
more chewing apparatus.

6. GROUP FUNCTION
Multiple contact relations between the maxillary
and mandibular teeth in lateral movements on
the working side whereby simultaneous
contact of several teeth acts as a group to
distribute occlusal forces.
CENTRIC POSITION PROTRUSIVE POSITION LATERAL POSITION
Working Nonworking
Posterior tooth make
contact.
Anterior teeth may or
may not contact.
Canine and posterior
teeth disclude .
Teeth contact
(mostly desirable
canine, premolar,
mesiobuccal cusp
of 1st molar)
No tooth
contacts.

7. GROUP FUNCTION

8. ADVANTAGES OF GROUP FUNCTION
OCLUSION
1) Lateral pressure are distributed to all working
side tooth.
2) Long centric, so allow some freedom of
movement in an anteroposterior direction.

9. BALANCED OCCLUSION
The bilateral, simultaneous, anterior, and
posterior occlusal contact of teeth in centric
and eccentric positions.
CENTRIC POSITION PROTRUSIVE POSITION LATERAL POSITION
Working Nonworking
Anterior and posterior
teeth contact
All maxillary and
mandibular teeth
contact
Posterior teeth
make contact
Posterior
teeth make
contact.

10. BALANCED OCLUSION
In lateral position, working side In lateral position, balancing side

11. ADVANTAGES OF BALANCED
OCCLUSION
1) Help to seat the denture in a stable position
during function.
2) Patients do not upset the normal static,
stable, and retentive position of their
dentures.
3) In balanced occlusion, the denture bases are
stable during bruxing activity.

12. OCCLUSION IN NATURAL DENTITION
• Posterior disclusion on protrusion
• Disclusion on non working side during lateral
movement.
• Occlusion on working side (either canine
guided/group function) during lateral
movement.

13. DESIRABLE OCCLUSION FOR
COMPLETE DENTURE
1) Stability of occlusion in centric relation.
2) Balanced for all eccentric contacts bilaterally
for all eccentric mandibular movements
The balancing arrangement
in centric occlusion, buccal
view.
In working occlusion,
buccal view.
In balancing position,
buccal view

14. 3) Control of horizontal forces by buccoligual cusp
height reduction according to the residual ridge
resistance form and interarch distance.

15. 4) Functional lever balance by favorable tooth to
ridge crest position

16. 5) Unlocking the cusp mesiodistally to allow for
gradual but inevitable settling of the bases due to
tissue deformation and bone resorption.
6) Cutting and shearing efficiency of the occlusal
surface (sharp cusps or ridges).
7) Anterior clearance of teeth during mastication.
Minimum occlusal contact between the upper
and lower teeth to reduce pressure during
function.

17. DESIRABLE OCCLUSION FOR RPD
**Simultaneous bilateral contacts of opposing posterior
teeth must occur in centric occlusion.
1)Kennedy class-I-
>>> Mandibular RPD opposed by natural dentition.
Contact on working side
No contact on balancing side.

18. >>>Maxillary RPD opposing natural dentition or
mandibular bilateral distal extension RPD
Simultaneous contact on working
and non working side.
In lateral position, nonworking sideIn lateral position, working side

19. >>>Mandibular RPD opposed by maxillary complete denture-
During lateral movement, both working and balancing
side make contact.Not necessarily balanced in protrusion.
In lateral position, nonworking side
In lateral position, working side
In protrusive position

20. 2)Kennedy class-II
Contact on working side
No contact on balancing side.
In lateral position, nonworking sideIn lateral position, working side

21. 3) Kennedy class-III
similar to occlusion in harmonious natural
dentition

22. 4) Kennedy class-IV
Contact in intercuspal position
No contact in eccentric position

23. DESIRABLE OCCLUSION FOR FPD
**Similar as occlusion in natural dentition
Either mutually protected or group
function occlusion.
**In the following cases, desirable occlusion should
be group function
-Periodontally compromised supporting
anterior teeth.
-Missing canine
-Angle class-II and class-III malocclusion
-Crossbite

24. DESIRABLE OCCLUSION FOR
OSSTEOINTEGRATED PROSTHESIS
1) Full-arch fixed prosthesis
Bilateral balanced occlusion with opposing complete
denture
Group function occlusion or mutually protected
occlusion with shallow anterior guidance when opposing
natural dentition
Freedom in centric (1–1.5mm)
2) Overdenture
Bilateral balanced occlusion using lingualized
occlusion
Monoplane occlusion on a severely resorbed ridge

25. 3) Posterior fixed prosthesis
Anterior guidance with natural dentition
Group function occlusion with compromised
canines
Centered contacts, narrow occlusal tables, flat cusps
Cross bite posterior occlusion when necessary
4) Single implant prosthesis
Anterior or lateral guidance with natural dentition
Light contact at heavy bite and no contact at light
bite
Centered contacts (1–1.5mm flat area)
Increased proximal contact

26. References:
1) JUNHEI FUJIMOTO: CONTEMPORARY FIXED PROSTHODONTICS.
2) HERBERT T. SHILINBURG, FUNDEMENTAL OF FIXED
PROSTHODONTICS.
3) SUMAIYA HOBO: OSSEOINTEGRATION AND OCCLUSAL
REHABILITATION
4) SHELDON WINKLER: ESSENTIALS OF COMPLETE DENTURE
PROSTHODONTICS.
5) DEEPAK NALLASWAMY VEERAIYAN: TEXTBOOK OF
PROSTHODONTICS
6) SOME INFORMATION FROM INTERNATE