Exam 6: Occlusion

Class III occlusion is also known as mesioclusion because the mesiobuccal cusp of the mandibular first molar is mesial to the buccal groove of the maxillary first molar.

In ideal occlusion the mandibular first molar is stolarized because neither its mesial nor distal contact areas are open.

When the maxilla outgrows the mandible, a class II occlusion often results.

Dr. P. R. Begg described a dental classification system based on the relationship of the permanent first molars.

In class I occlusion the mesiobuccal cusp of the maxillary first molar occludes with the buccal groove of the mandibular first molar.

The curve of Spee deepens with age.

Occlusion must be evaluated bilaterally. An individual might have a class I on one side and a class III on the other side.

Protrusion of the maxillary anterior teeth can be caused by tongue thrusting because improper tongue placement during swallowing exerts powerful pressure against lingual surfaces of anterior teeth.

Centric relation refers to the position of the retruded mandible to the maxilla.

An open bite refers to

Tongue thrusting can cause an overbite.

A comparison of 800 Australian aboriginal skulls show that class III occlusions were more successfully passed on through genetics than other occlusal patterns. Such analysis revealed that the prognathic profile and mesially protruded class III mandible provided superior strength in incising and grinding food.

Class II occlusion is the most common classification of occlusion.

In class II, division II, one would expect to see

Each structure acts as an internal force in determining tooth alignment EXCEPT one. Which one is the EXCEPTION?

When a maxillary canine contacts its opposing antagonist before any other teeth occlude, it is described as anterior coupling. When one tooth hits ever so slightly more than the others, premature contact is occurring.

Classification of occlusion by the Angle system primarily relies upon the relationship between maxillary and mandibular canines because the anatomical features of molars are more difficult to interpret.

A premature contact can be associated with each of the following EXCEPT one. Which one is the EXCEPTION?

Each of the following is a possible manifestation of a class III occlusion EXCEPT one. Which one is the EXCEPTION?

A crossbite occurs between only one maxillary tooth and one mandibular tooth because when more teeth are involved the condition is called overbite.