When the mandible is in ICO, which teeth opposite to the mandibular canines? ()
A. (3)
B. (2)
C. (3) and (4)
D. (2) and (3)
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which of the following descriptions about incisal path inclination is correct? ()
A. It is proportional to the over bite occlusion.
B. It is inversely proportional to the overjet
C. It is the angle formed by the incisal path and the occlusal plane.
D. All of the above are correct.
正常覆盖时,上颌切牙切缘到下颌切牙唇面的距离是:( )
A. 7 mm以上
B. 5~7 mm
C. 3~5 mm
D. 3 mm以内
When the mandible is in the normal intercuspal occlusion, the cusp tips of maxillary canines are facing ()
A. the mesial margins of mandibular canines
B. the cusp tips of mandibular canines
C. the distal margins of mandibular canines
D. the buccal cusps of mandibular first premolars
E. There is no clear mark.
Which teeth are essential for building a normal occluding relation so that they should be reserved from extraction? ()
A. Canines
B. First premolars
C. Second premolars
D. First molars
E. Second molars
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