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.
结果：乳牙根管预备后疼痛的发生率为7.83%，根充后疼痛的发生率为10 . 4 3%。
RESULTS: The incidence of pain after root canal preparation and fillings was 7.83% and 10.43% respectively.
目的探索适合乳牙根管充填的材料。方法用两种根管充填材料对乳前牙进行根管治疗。
Objective To investigate the therapeutic effect of FR paste used for root canal filling of deciduous teeth.
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