Where does attrition frequently take place in a tooth? ()
A. labial surface, occlusal surface
B. incisal margin, occlusal surface
C. incisal margin, tooth cervix
D. incisal ridge, occlusal surface, proximal surface
E. None of the above.
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The function of masticatory movement can be summarized into three stages: ()
A. protruding, retruding, and lateral movements
B. cutting, crushing and grinding movements
C. forward and backward, opening and closing, lateral movements
D. opening, food positioning, chewing movements
E. centric occlusion, small open occlusion, back to centric occlusion
The characteristic() of the chewing cycle is (): ()
A. both procedural and repetitive
B. only repetitive
C. only procedural
D. sometimes procedural, sometimes repetitive
E. neither of them
Which of the following statements is a characteristic of the normal chewing cycle: ()
A. There is no obvious momentary stop of mandibular movements during occlusal contacts.
B. The shape of the chewing cycle is unstable.
C. The speed of the chewing cycle varies a lot.
D. There is no rhythm in the movement.
E. The path is tear-shaped.
There are several common masticatory movements, except for: ()
A. alternative bilateral chewing
B. chewing on both sides
C. anterior teeth chewing
D. chewing on the left side
E. chewing on the right side
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