Which of the following teeth have the cross-shaped developmental grooves? ()
A. Maxillary first molar.
B. Mandibular first molar.
C. Maxillary second molar.
D. Mandibular second molar.
E. Mandibular second premolar.
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Which of the following teeth show two and a half cusps from the buccal aspect? ()
A. Maxillary first molar.
B. Mandibular first molar.
C. Maxillary second molar.
D. Mandibular second molar.
E. Third molars.
The atrophy of the gingiva from the direct impaction of the food is caused by ().
A. the irregular shape of the crown
B. the normal crest of curvature of the crown
C. the under-contouring curvature of the crown
D. the over- contouring curvature of the crown
E. none of the above
The disused atrophy of the gingiva from the lack of the food massage on the gingiva is caused by ().
A. the non-contouring curvature of the crown
B. the over-contouring curvature of the crown
C. the under-contouring curvature of the crown
D. the normal crest of curvature of the crown
E. the irregular shape of the crown
23 0:11:53选择题 根管系统不包括:()
A. 根管
B. 管间吻合
C. 根管侧支
D. 根尖分歧
E. 髓腔
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