24 0:04:40 Multiple choice question The tooth with the smallest pulp cavity is _________. ()
A. maxillary central incisor
B. maxillary lateral incisor
C. mandibular central incisor
D. mandibular lateral incisor
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25 0:03:56选择题 前磨牙中,双根管发生概率最高的牙齿是:()
A. 上颌第一前磨牙
B. 上颌第二前磨牙
C. 下颌第一前磨牙
D. 下颌第二前磨牙
25 0:03:56 Multiple choice question Among the premolars, which of the following teeth has the highest proportion of having double root canals: ()
A. Maxillary first premolar
B. Maxillary second premolar
C. Mandibular first premolar
D. Mandibular second premolar
26 0:08:09选择题 关于下颌第一磨牙的髓腔形态的描述不正确的是:()
A. 髓室近远中径大于颊舌径大于髓室高度
B. 髓室顶形凹,最凹处约与颈缘平齐
C. 舌侧髓角高度约近牙冠中1/3
D. 颊侧和远中髓角较低,位于牙冠颈1/3或颈缘附近
E. 近中根管为双管型者占13%
26 0:08:09 Multiple choice question Which of the following descriptions about the pulp cavity of the mandibular first premolars is incorrect: ()
A. The mesiodistal diameter of the pulp chamber is larger than the buccolingual diameter, and the buccolingual diameter is larger than the height of the pulp chamber.
B. The roof of the pulp chamber is concave. The bottom of the concavity is nearly at level with the cervical margin.
C. The height of the lingual pulp horn nearly reaches the middle third of the crown.
D. The pulp horns of buccal cusps and distal cusp are relatively low, and are located at cervical third of the crown or near the cervical line.
E. The double-root canals account for 13% among the mesial root canals.
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