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材料和方法 选30颗拔除的无临床损害的尖牙和切牙,使用前在121℃15磅压力下高压灭菌15min,然后存放在2％戊二醛中。拍片确定根管为直的单根管以及根管的完整性。开髓常规预备根管,用Gates Glidden钻(2~#～4~#)扩大根管口,用侧压法进行根管充填。距解剖根尖3～5mm处与牙长轴成45°切除根尖。牙齿等分成三组,用三种方法进行根端预备。第一组为传统预备法加超声波预备。先用直手机在牙长轴根端面制成至少深3mm的窝洞,随后用特制的超声波工作
MATERIALS AND METHODS Thirty unplugged canine and incisors without clinical lesions were selected and autoclaved for 15 min at 121 ° C and 15 lb pressure prior to use and then stored in 2% glutaraldehyde. Film to determine the root canal straight root canal and the integrity of the root canal. Open conventional medullary root canal preparation, with Gates Glidden drill (2 ~ # ~ 4 ~ #) to expand the root canal, lateral pressure method for root canal filling. 3 ~ 5mm from the root tip of the dissection and long axis of the tooth into a 45 ° resection of the root tip. Teeth were divided into three groups, with three methods for root preparation. The first group of traditional preparation plus ultrasonic preparation. First with a straight mobile phone in the tooth root end face made of at least deep 3mm cavity, followed by a special ultrasonic work