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RESD - Cusp-Fossa

Cusp-Fossa Relationship

QuestionAnswer
Maxillary Functional Cusp Lingual
Mandibular Functional Cusp Buccal
Definition of a Functional Cusp Cusp that lands in a functional fossa
What % of the population has ideal Cusp-Fossa relationships? What type of relationship does most of the population have? 5%, Rest are cusp-marginal ridge
2 Reasons that Cusp-Fossa is ideal 1) Occlusal forces are near the center of the tooth 2) Less food impaction
What are the two other names for the Functional cusp? 1. Working 2. Supporting
What is the other name for the non-Functional cusp? Guiding cusp
What does FOA stand for? Functional Outer Aspect
What is the FOA? The outer 1-2 mm of the supporting cusp that makes contact with the guiding inclines of the guiding cusps of the opposing teeth when in occlusion
Where are the FOA contacts - A, B, and/or C? A and C
What is doing the work in a cusp-fossa relationship, the tip or the ridges? Cusp Ridges!
What is disclusion? The prevention of contact on either working or non-working sides during excursive movement
Does wax shrink or expand? Shrinks!
Created by: janygb143
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