Occlusal Relationships and Functional Occlusion

Question 1

Define ideal occlusion.

Answer 1

A theoretical occlusion based on the morphology of the teeth.

Question 2

Define normal occlusion.

Answer 2

An occlusion which satisfies the requirements of function and aesthetics but in which there are minor irregularities of individual teeth.

Question 3

Define malocclusion.

Answer 3

An occlusion in which there is a malrelationship between the arches in any of the planes of space or in which there are anomalies in tooth position beyond the limits of normal.

Question 4

What is Angle’s molar classification?

Answer 4

The ideal molar relationship: mesiobuccal cusp of maxillary 1st molar with the anterior buccal groove of the opposing 1st mandibular molar.

Question 5

What are Andrew’s 6 keys of occlusion?

Answer 5

• Class I molar relationship
• Crown angulation: each tooth slightly distally inclined
• Crown inclination: gingival portion of the labial surface of the crown is lingual to the incisal portion
• No rotations of the teeth
• No spaces, only tight contact points present
• Flat curve of Spee (occlusal plane)

Question 6

What is Roth’s philosophy?

Answer 6

Suggested functional occlusal goals

Question 7

What are Roth’s functional occlusal goals?

Answer 7

• Change from centric relation to centric occlusion should be a simple hinge movement
• Occlusal forces should be equal on all posterior teeth and directed down their long axes
• The maxillary anterior teeth should meet the lowers evenly, and disclude the posterior teeth on protrusion
• Canines should disclude the posterior teeth in lateral mandibular movements