目的：评价手术显微镜用于探寻上颌第一恒磨牙mb 2根管口的诊断价值。
PURPOSE: To estimate the diagnostic potential of the dental operating microscope use for locating MB2 orifice in maxillary first molars.
目的研究上颌第一磨牙根管口形态和位置关系，为根管治疗时寻找根管口提供解剖学依据。
Objective To study the shape and location of root canal orifice in maxillary first permanent molar and provide a morphological basis for locating canal orifice in endodontic therapy.
用传统玻璃离子粘固剂修复根管口呈喇叭形残根与不作修复的对照组之间没有显著性差异。
However, there is no obvious difference between non-repaired and residual dental root groups repaired by traditional glass ionic adhesives.
目的：介绍一种由螺旋型根管钻、自行设计的根管口台阶状车针、预成桩核组成的预成桩核系统。
Objective:To introduce a new prefabricated post-and -core system, a helical drilling bit and a prefabricated post-and -core consisting of a root canal orifice bur which was designed by the author.
在根管口段，两组间无显著性差异（P>0.05）。 两组间根管预备时间无统计学差异（P>0.05）。
There was no significant difference between the two groups at the coronal level (P>0.05) as well as preparation time (P>0.05).
在根管口段，两组间无显著性差异（P>0.05）。 两组间根管预备时间无统计学差异（P>0.05）。
There was no significant difference between the two groups at the coronal level (P>0.05) as well as preparation time (P>0.05).
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