Which of the following descriptions about the normal signs of the intercuspal occlusion is incorrect: ()
A. Each tooth is in contact with two teeth on the opposite jaw
B. Canine relationship is normal.
C. The first molar relationship is neutral.
D. The overbite and overjet relationships of anterior and posterior teeth are normal.
E. The midlines of the upper and lower dentition are aligned with the frenulum of the upper lip.
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As for the intercuspal position, which of the following statements is incorrect: ()
A. It is based on the intercuspal occlusion.
B. It is the position of the mandible to the maxilla during intercuspal occlusion.
C. It changes with the intercuspal occlusion.
D. It is also called the muscle position.
E. It is abbreviated as ICP.
Which of the following statements about retruded contact position is incorrect: ()
A. The mandible moves backward and downward for about 1 mm from the intercuspal position.
B. Everyone has it.
C. There is partial contact of the posterior teeth cusp slope.
D. The condyle is located at the rear part of the mandibular fossa.
E. It is the physiological final position of the mandible.
Which of the following statements about the mandibular postural position is incorrect: ()
A. It is the resting position of the mandible.
B. It is stable and repeatable.
C. It is the position of the mandible when a person sits or stands upright and looks forward, without chewing, swallowing, speaking, nor contact between the upper and lower teeth.
D. There is a 1-3 mm space between the upper and lower incisors.
E. There is no potential activity of the maxillary elevating muscles at this position.
The physiological significance of protrusive occlusal position includes: ()
A. It’s good for protecting the posterior teeth.
B. It’s good for cutting food.
C. It is beneficial to the protection of the TMJ.
D. It is beneficial to the occlusal stability.
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