OCCLUSION

Question 1

DEFN of group function

Answer 1

multiple contact relations between max and mand teeth in lateral movements on working side, whereby simultaneous contact of several teeth acts as a group to distribute occlusal forces

• excursive contact occurs between posterior teeth on only the laterotrusive side whereas no contact on the mediotrusive side
• in protrusive movement, no posterior tooth contacts occur

Question 2

defn of mutually protected articulation

Answer 2

is an occlusal scheme in which posterior teeth prevent excessive contact with the anterior teeth in MI, and anterior teeth disengage the posterior in all mandibular excursive movements (GPT 5th ed)

features:
- uniform contact of all teeth around the arch when the mandiblar condylar processes are in their most superior position
- contact of all stable posterior teeth with vertically directed resultant forces
- CR coincident with MI
- no contact of posterior teeth in lateral or protrusive movements
- harmonizing of anterior tooth contacts with functional mandibular movements