Occlusion I - Comprehensive Guide to Optimal Functional Occlusion Criteria

Define occlusion

- act or process of closure/being closed or shut off

- static relationship btw. incising or masticating surfaces of maxillary and mandibular teeth

Define MIP

- complete intercuspation of opposing teeth independent of condylar position

Define centric occlusion

- occlusion of opposing teeth when mandible is in centric relation

True/False: centric occlusion always conincides with MIP

False

Define centric slide

- movement of mandible while in CR

- from initial occlusal contact into MIP

What is the average length of centric slide?

A) 1.00 mm

B) 1-1.25 mm

C) 1.25-1.50 mm

D) 1-2 mm

B) 1-1.25 mm

All of the following are criteria for optimal functional occlusion EXCEPT one. Which one is the exception?

A) orthopedicallly stable TMJ

B) optimal functional tooth contacts

C) disocclusion of posterior teeth in mandibular eccentric movement

D) disocclusion of anterior teeth in mandibular eccentric movement

D) disocclusion of anterior teeth in mandibular eccentric movement

What is the orthopedically stable TMJ position

- condyles in centric relation

- elevator muscles + superior lateral ptyergoids are firing

- inferior pterygoids + supra/infrahyoids are relaxed

True/False: more posterior contacts than anterior contacts are optimal

True

What are the teeth able to withstand horizontal forces?

A) incisors

B) canines

C) premolars

D) molars

B) canines

True/False: when CO doesn't equal MIP, this results in a stable TMJ

False

True/False: co-contraction is a sign of a stable TMJ

False

What is the most common muscle involved in co-contraction?

A) superior lateral pterygoid

B) inferior lateral pterygoid

C) medial pterygoid

D) masseter

B) inferior lateral pterygoid

True/False: optimal functional posterior contacts results in oblique force on the teeth

False

True/False: more force is generated on an object if it's further away from the TMJ (ex. between the anterior teeth)

False

What are the worst teeth to control eccentric contact forces?

A) anterior teeth

B) posterior teeth

B) posterior teeth

What are the best teeth to control eccentric contact forces?

A) incisors

B) canines

C) premolars

D) molars

B) canines

Rank the occlusion schemes from worst to best

A) bilateral balanced occlusion - group function occlusion - canine guided occlusion

B) group function occlusion - bilateral balance occlusion - canine guidance occlusion

C) canine guided occlusion - bilateral balanced occlusion

D) canine guided occlusion - group function occlusion - bilateral balanced occlusion

A) bilateral balanced occlusion - group function occlusion - canine guided occlusion

Rank the occlusion schemes from best to worst

A) bilateral balanced occlusion - group function occlusion - canine guided occlusion

B) group function occlusion - bilateral balance occlusion - canine guidance occlusion

C) canine guided occlusion - bilateral balanced occlusion

D) canine guided occlusion - group function occlusion - bilateral balanced occlusion

D) canine guided occlusion - group function occlusion - bilateral balanced occlusion

True/False: canine guided occlusion is characterized by only opposing canines on working side contacts in mandibular lateral excursion

True

What is the most ideal group in group function occlusion?

canines, premolars, MB cusp on maxillary first molar

True/False: bilateral balanced occlusion is ideal in health occlusion

False

In bilateral balanced occlusion

A) only canines touch in centric and excursive movement

B) canines, premolars, and the MB cusp on the maxillary first molar touch in centric and excursive movement

D) all teeth touch bilaterally in centric and excursive movement

D) all teeth touch bilaterally in centric and excursive movement