Methods 60 human premolars were selected and divided into six groups by random.
方法收集离体人前磨牙60个，随机分成6组。
Methods:28 human premolars extracted for orthodontic reasons were collected for the experiment. Every premolar was split vertically into medial and distal haves.
方法：收集临床上因正畸需要拔除的前磨牙28颗，将每个牙齿分为近中和远中两个邻面标本。
Objective To investigate root canal curvatures of human maxillary first premolars in buccolingual directions.
目的研究上颌第一前磨牙根管颊舌向的弯曲情况。
Objective To compare the fracture resistance and failure modes of endodontically treated human upper premolars restored with different postcore systems.
目的比较不同桩修复离体牙对修复体整体抗折强度的影响。
Objective To compare the fracture resistance and failure modes of endodontically treated human upper premolars restored with different postcore systems.
目的比较不同桩修复离体牙对修复体整体抗折强度的影响。
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