Exam 6: Occlusion

The transverse occlusal curve seen from a posterior view is called the curve of Spee.The curve of Wilson refers to the fairly even curve of the buccal cusp tips of posterior teeth when viewed laterally.

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

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.

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

An 11-year-old child presents with wide spaces between mandibular second premolars and permanent first molars.These spaces are typical of

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 on the relationship between maxillary and mandibular canines because the anatomical features of molars are more difficult to interpret.

Class II occlusion is the most common classification of occlusion.

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

The average overjet of primary teeth is 2.0 mm.

A deep bite could result from hyperactive masticatory muscles because such muscular activity could prevent full eruption of posterior teeth.

From a lateral view,most teeth show a slight inclination in which direction?

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

Retruded teeth are lingually inclined.Retruded permanent central incisors are associated with Class III occlusion.

A comparison of 800 Australian aboriginal skulls shows 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.

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

In Class II Division II,one would expect to see

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

The curve of Spee deepens with age.

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