21 0:07:33 选择题 第二乳磨牙与同颌的第一恒磨牙相比具备以下哪些特点:()
A. 第二乳磨牙的牙冠较第一恒磨牙小,色乳白
B. 第二乳磨牙的牙冠近颈缘明显缩小,牙冠向牙合方缩小,近颈部大而牙合面小
C. 下颌第二乳磨牙的近中颊尖、远中颊尖及远中尖大小相等
D. 同颌一侧牙列上,近中向远中有两个相似的磨牙,近中较小者为第二乳磨牙
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21 0:07:33 Multiple choice question Compared with the permanent first molar on the same jaw, what characteristic does the deciduous second molar have: ()
A. The crown of the deciduous second molar is smaller than that of the permanent first molar, and the color is bluish-white.
B. The crown of the deciduous second molar is significantly constricted near the cervix, and is also constricted towards the occlusal surface, with the cervical region larger than the occlusal region.
C. The mesiobuccal cusp, distobuccal cusp and distal cusp of deciduous mandibular second molar are of the same size.
D. On either side of the same jaw, between the two similar molars in the mesial and distal directions, the smaller one to the mesial is the deciduous second molar.
The tooth with the smallest pulp cavity is _________.
A. maxillary central incisor
B. maxillary lateral incisor
C. mandibular central incisor
D. mandibular lateral incisor
The deciduous teeth and the permanent teeth are similar in the shape of their pulp cavities. But proportionally, the deciduous teeth have the smaller pulp cavities, thinner walls and taller pulp horns than the permanent teeth.
Biting force means
A. the maximal force that the masticatory muscles can exert
B. the actual pressure on the teeth during masticatory movements
C. the actual force generated by the masticatory muscles during masticatory movements
D. the maximal tolerance of periodontal ligament
E. the minimal force required to crush food
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