倒敞法技术用于弯曲根管的预备

Initial Clinic Research on Curved Canal Preparation by Reverse Flaring Technique

目的 评价倒敞法预备中等弯曲度根管 (弯曲度为 30°～ 6 0°)的效果。方法 选择 2 0 0 1年 11月～ 2 0 0 3年 8月在四川大学华西口腔医院牙体牙髓科因牙髓炎或根尖周炎就诊 ,需作根管治疗患者的 4 8颗下颌第一磨牙为研究对象。患牙近中根弯曲度按Schineider法计算为 30°～ 6 0°。其中实验组 2 7颗患牙采用倒敞法预备根管 ,对照组 2 1颗患牙采用逐步后退法预备根管。比较两组预备方法在根管预备中及预备后达到根管工作长度的例数。结果 ①实验组初尖锉测量达到根管工作长度的例数显著高于对照组 (χ2 =4 70 4 ,P <0 0 5 ) ,②实验组主尖试充测量达到根管工作长度的例数也显著高于对照组 (χ2 =7 75 9,P <0 0 5 )。结论 在中等弯曲根管预备中 ,倒敞法优于逐步后退法 ,值得在临床推广应用。

Objective Curved canal preparation is much difficult in root canal therapy(RCT). Step back technique and routine technique are still regular methods in curved canal preparation. The purpose of this study was to introduce a new method—reverse flaring technique, and to investigate its preparation efficiency in intermediate-curvature canals.Methods 48 cases of lower first molars RCT were collected, which were first treated because of pulpitis or apical periodontitis in West China College of Stomatology, Sichuan University from Nov. 2001 to Aug. 2003, mesial canal curvature was intermediate (30 °～60 °), determined by Schineider method. Cases were divided into two groups, in reverse flaring technique group, canal preparation in 27 cases were finished by reverse flaring technique, 21 cases by step back technique as control. In working length determination and fitting master cone stages, cases in two groups which fit full working length were recorded, determined by radiogragh, and analyzed by χ+2 test.Results In working length determination stage, cases which fit full working length in reverse flaring technique group were significantly more than that of step back technique group (P<0.05), in fitting master cone stage, cases which fit full working length in reverse flaring technique group were also significantly more than that of step back technique group(P<0.05).Conclusion In working length determination stage, cases which fit full working length in reverse flaring technique group were significantly more than that of step back technique group (P<0.05), in fitting master cone stage, cases which fit full working length in reverse flaring technique group were also significantly more than that of step back technique group(P<0.05).