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.
方法：对135例需要恒磨牙根管再治疗患者的159颗恒磨牙(232个根管)用显微超声技术进行再治疗，按牙位及治疗原因分类，比较成功率。
Methods: the total of 232 root canal in 159 teeth of 135 patients who need root canal retreatment of the permanent molar were treated by using dental operative microscope and ultrasonic technique.
方法：对135例需要恒磨牙根管再治疗患者的159颗恒磨牙(232个根管)用显微超声技术进行再治疗，按牙位及治疗原因分类，比较成功率。
Methods: the total of 232 root canal in 159 teeth of 135 patients who need root canal retreatment of the permanent molar were treated by using dental operative microscope and ultrasonic technique.
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