5 0:02:02 multiple-choice question 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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6 0:09:55 multiple-choice question The forms of mandibular movements include: ()
A. marginal movement
B. habitual opening and closing movement
C. functional movement
D. masticatory movement
Which of the following teeth can have C-shaped cross section at the root canal?
A. Maxillary first molar
B. Maxillary second molar
C. Maxillary third molar
D. Mandibular first molar
E. Mandibular second molar
Which of the following descriptions about the pulp cavity of the mandibular first premolars is incorrect
A. The mesiodistal diameter of the pulp chamber is larger than the buccolingual diameter, and the buccolingual diameter is larger than the height of the pulp chamber.
B. The roof of the pulp chamber is concave. The bottom of the concavity is nearly at level with the cervical margin.
C. The height of the lingual pulp horn nearly reaches the middle third of the crown.
D. The pulp horns of buccal cusps and distal cusp are relatively low, and are located at cervical third of the crown or near the cervical line.
E. The double-root canals account for 13% among the mesial root canals.
Among the premolars, which of the following teeth has the highest proportion of having double root canals
A. Maxillary first premolar
B. Maxillary second premolar
C. Mandibular first premolar
D. Mandibular second premolar
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