Posterior tooth selection

By Dr. Vishaal Bhat on Sunday, July 6, 2008 with 0 comments

5 factors of occlusion:

1. Condylar guidance -4. Occlusal plane

2. Incisal guidance -5. Cusp angle

3. Compensating curve

-of the above, the condylar guidance does not change

-of the above, the dentist has control over the incisal guidance, the compensating curve and the cusp angle.

Classification of tooth form:

-anatomic teeth: 30º. 33º & 45º

-semi-anatomic: 20º

-flat or monoplane teeth: 0º

6 advantages to anatomic teeth:

1. Can establish mechanical and physiologic occlusion.

2. Penetrates food more easily.

3. Articulate in harmony with TMJ and masticatory muscles.

4. Resists rotation of denture base through interdigitation with cusps.

5. Better esthetics.

6. Less trauma to underlying tissues.

3 disadvantages to anatomic teeth:

1. Requires and exacting technique.

2. Lateral torque.

3. Relining and rebasing is difficult.

7 advantages to non-anatomic teeth:

1. They don’t lock the mand into one position.

2. They minimize horizontal pressure due to no inclined planes.

3. Closure can occur in more than one position---centric relation can be an arearather than a point.

4. They can easily adapt to Class II & III jaw relationships.

5. They accommodate to changes in vertical and horizontal relations of ridges.

6. Relining and rebasing is easier.

7. They improve denture stability.

3 disadvantages of non-anatomic teeth:

1. Less efficient mastication---do not penetrate food well.

2. Clogging of occlusal surfaces with food occurs.

3. They are esthetically inferior to anatomic teeth.

Category: Prosthodontics Notes



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