various technique for selection of posterior teeth in complete denture

1. Posterior teeth selection
Dr vikram kumar
MDS.BHU

2. FORM OF POSTERIOR TEETH
• 1.SIZE AND NUMBER OF POSTERIOR
TEETH
• 2.FORM OF POSTERIOR TEETH
• 3.SHADE OF POSTERIOR TEETH

3. SIZE OF POSTERIOR TEETH
•Buccolingual width.
• Mesiodistal length.
• Occlusogingival height

4. • The buccolingual width of the artificial teeth should be
decreased so that the buccal and lingual surfaces slope out
from the occlusal surface to provide a proper path of
escapement of food duringmastication.
• If the buccolingual width increases, the forces acting on the
denture will also increase, leading to increase in the rate of
ridge resorption.
• Broader teeth encroach into the tongue space leading to
instability of the denture.
Buccolingual width.

5. Occluso-gingival Height
Decreased inter-arch distance that
will compromise on the occluso-
gingival height of the prosthetic
teeth
Good inter-arch space to
place teeth with high occluso-
gingival height

6. Mesiodistal Length
• Combined length of all the posterior teeth on that side of the arch does
not exceed the distance between the canine and the retromolar pad
• Posterior teeth should not be placed over steep anteroposterior ridge
slope as this would lead to forward displacement of the denture. the
teeth should not be placed over displaceable
• Tissues like the retromolar pad as it will cause tipping of the denture
during function
• In cases with inadequate mesiodistal length, the premolar can be
omitted.

7. Mesiodistal length of the edentulous ridge

8. .FORM OF POSTERIOR TEETH
Factors that control the selection of the form of a tooth:
• Condylar inclination
• Height of the residual ridge: Shallow cusped teeth go better
with shallow ridges
• Patient’s age: Teeth with shallow cusps are preferred in
older people.
• Ridge relationship: 0degree or monoplane teeth are
preferred for cases with posterior cross bite or severe class
II relationship

9. Condylar inclination
(a)Shallow condylar guidance will
require teeth with shallow (lower)
cuspal angle
(b) Steep condylar guidance will require
teeth with higher cuspal angulation to
produce occlusal balance

10. Height of the residual ridge
Deep/steep cusp teeth should be
used over steeper and taller
ridges
Shallow cusped teeth should be used over
shallow ridges
Monoplane teeth are preferred to attain
good occlusal harmony in severe class II
ridge relationships

11. Occlusal form decided on the type of occlusion.
• Occlusal form decided on the type of occlusion.
• • Types of teeth to be used :-
• 1. Balancing in centric and eccentric –cusp form tooth
• 2. Disocclude during eccentric jaw movements -monoplane
teeth
3. Arranged in a plane and balanced only in centric-
monoplane is used

12. Morphologically teeth can be
classified as:
• Cusp teeth
• — Anatomic teeth
• — Semi-anatomic or modified cusp or low
cusp teeth
• • Cuspless teeth
• • Special forms

13. Anatomic teeth
• These teeth resemble normal newly-erupted teeth.
• They provide the best aesthetics and are the most
commonly used type of artificial teeth.
• The cusps resemble normal dentition with an angle of
33degree.
• Anatomic teeth with 30degree cuspal angulation are also
available and are commonly known as Pilkington-Turner
teeth

15. Advantages of anatomic teeth
• 1.Aesthetically acceptable
• 2.More efficient- there by reducing the
• forces
• 3.They can arranged in balance
• Disadvantages of anatomic teeth
• 1.More horizontal forces during function
• 2.Fast bone resorbtion
• 3.Cannot be used in severly resorbed cases

16. Semi-anatomic Teeth
• They are also known as modified-cusp or low-cusp
teeth.
• They may have 20degree or 10degree cuspal
angulation.
• 10degree semi-anatomic teeth are commonly
known as functional or anatoline teeth
• They are used in cases with mild discrepancies in
jaw relation.
• They are more flexible to arrange than anatomic
teeth but they are not as flexible as nonanatomic
teeth.

17. Semi-anatomic Teeth

18. Cusp less Teeth
• They are also known as 0degree, flat, or monoplane teeth.
• They have no cuspal angulation hence are very flexible to
set.
• It is easy to set non-anatomic teeth in balanced occlusion.
Cuspless teeth can be used for the following occlusal
schemes:
• • Bilateral balance with a compensating curve.
• • Three-point balance with a balancing ramp.
• • Flat plane-balance in centric only.

19. Advantages of non anatomic teeth
• 1.Comfortable
• 2.Greater range of motion (in parafunctional jaw habits)
• 3.Less horizontal and or torqueing forces
• 4.Can be used in severely resorbed ridges and patients
with poor neuro-muscular coordination
• • Disadvantages of non anatomic teeth
• 1.They look unnatural
• 2.Less cutting efficiency

20. SHADE OF POSTERIOR TEETH
• The shade of posterior teeth should
harmonize to shade of anterior teeth
• As bulk influences shade of teeth so lighter
shade for bicuspids if it is used as aesthetic
purpose.
• Slightly lighter than posterior teeth but not
lighter than anterior teeth

21. Squint test
Squint test: It is used to check and
compare the colour of the teeth with the
colour of the face.
The dentist should partially close his eyes
to reduce light and compare artificial teeth
of different shades with the colour of the
face

22. MATERIAL COMPOSITION OF
POSTERIOR TEETH
• Both porcelain and acrylic are used
Upper and lower posterior teeth can be
• Both porcelain
• Both acrylic

23. Acrylic teeth
1.Limited interarch distance
2.Maxillary single denture against natural
dentition
3.Maxillary single denture opposing partial
denture
4.Opposing natural teeth with gold occlusal
surfaces

24. Porcelain teeth
• They have vey good esthetics
• High translucency
• Does not wear
• Long life

25. • SINGLE MAXILLARY COMPLETE
DENTURE:-
• TEETH SET USED ARE ACRYLIC TEETH
OPPOSING NATURAL DENTITION
• GOLD TEETH OR INSERTS CAN ALSO BE
USED BUT PORCELAIN IS NEVER USED.

26. • HIGHLY RESORBED RIDGES:-
• • MONOPLANE TEETH OR NON ANATOMIC
TEETH IS USED

27. THANKU