上颌第一磨牙(maxillary first molar)约在6岁左右萌出,故称其为“六龄牙”,是上颌牙弓中体积最大的牙。
目的研究上颌第一磨牙近中颊根第二根管的临床发现率。
Aim To investigate the clinical incidence of the second mesiobuccal root canal of maxillary first molars.
结果在64颗隐裂牙中,有28颗发生于上颌第一磨牙。
Results of 64 cracked teeth, 28 appeared in maxillary first molar.
目的:分析上颌第一磨牙根管弯曲位置、方向及弯曲度。
Objective: To analyse the root canal curvature frequency, position, direction and degree of the maxillary first molars.
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