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
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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
Which of the following does not belong to the root system? ().
A. The root canal
B. The intercanal anastomoses
C. The lateral branches of root canal
D. The apical ramification
E. The pulp cavity
24 0:04:40选择题 髓腔体积最小的是:()
A. 上颌中切牙
B. 上颌侧切牙
C. 下颌中切牙
D. 下颌侧切牙
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