超声波与传统慢速手机后牙根尖倒预备的比较研究  

COMPARISON BETWEEN SLOW-SPEED HANDPIECE AND ULUTRASONIC INSTRUMENT IN POSTERIOR TEETH ROOT-END PREPARATION

作　　者：张平娟[1] 陈文霞[1] 曾启新[1] 谢方方[1] 

机构地区：[1]广西医科大学口腔医学院牙体牙髓科,南宁530021

出　　处：《广西医科大学学报》2010年第3期386-389,共4页Journal of Guangxi Medical University

基　　金：广西科技厅青年基金资助项目(No.桂科青0339025);广西研究生教育创新计划资助项目(No.2006105981003M09)

摘　　要：目的:比较超声波和传统慢速手机在后牙进行根尖倒预备对根切面的影响。方法:32例附有颌骨和牙周组织,含两个主根管的下颌第一磨牙近中根,随机均分成2组,分别采用两种处理方式进行倒预备:(1)超声波组:超声波配金刚砂尖Berutti与镍钛尖RE2。(2)慢速手机组:慢速手机配No.2圆钻。扫描电镜下对比观察倒预备前、后的根切面环氧树脂模型,评价微裂数目、类型及管腔边缘质量。采用SPSS13.0软件包行KruskalWallisTest。结果:超声波组的微裂数目明显少于慢速手机组,差异有统计学意义(P=0.002);超声组与慢速手机组之间微裂类型差异无统计学意义(P=0.929);超声波组的管腔边缘质量优于慢速手机组,差异有统计学意义(P=0.029)。结论:超声根尖倒预备技术用于后牙具有明显的优越性和可行性。Objective：To evaluate the effects of posterior teeth retrograde preparation on ultrasonic retrotips and traditional slow-speed handpiece. Methods：Thirty-two rnesial roots of the mandibular first molars with two canals, mature root apices, and periodontal tissue were assigned randomly to 2 groups of 16 each. The root end preparations were made respectively using ultrasonic diamond tip Berutti and NiTi tip RE2 and slow-speed handpiece with No. 2 round bur. The preoperative and postoperative epoxy resin replicas were examined under scanning electron microscope for further evaluating the number and type of the micro- cracks, the quality of cavity margin. Kruskal Wallis Test of SPSS13.0 was used,and a P values less than 0.05 were considered to be significant. Results：The number of micro-crack in ultrasonic group was signifi- cantly less than that in slow-speed handpiece group（ P =0. 002）. The type of micro-cracks has no significant difference between the two groups（ P =0. 929）. The quality of cavity margin in the ultrasonic group was significant better than that in the slow-speed handpiece group（ P=0. 029）. Conclusion：Ultrasonic instrument is feasible in the posterior teeth root-end preparation.

关 键 词：超声器械 第一磨牙 根尖倒预备 

分 类 号：R781.05[医药卫生—口腔医学]