超声波与传统慢速手机后牙根尖倒预备窝洞壁清洁度的评价

Evaluation of the cavity cleaning of ultrasonic instruments and slow-speed handpiece in posterior teeth root-end preparation

目的:比较超声波和传统慢速手机在离体后牙进行根尖倒预备窝洞壁清洁度的差异。方法:近中根含2个主根管的离体下颌第一磨牙32颗,随机分为2组,每组16颗,分别采用2种处理方式进行根尖倒预备。超声波组用超声波配金刚砂尖Berutti与镍钛尖RE2,慢速手机组用慢速手机配2#圆钻。扫描电镜下评价窝洞壁碎屑和玷污层。采用SPSS 13.0软件包对数据进行Kruskal Wallis秩和检验。结果:超声波倒预备的窝洞壁碎屑和玷污层显著少于慢速手机(P<0.05)。结论:超声波对后牙进行根尖倒预备能获得较清洁的窝洞。

PURPOSE： To compare the cleanliness of root end preparations by using ultrasonic instrumentation and slow-speed handpiece. METHODS： Thirty-two mesial roots of the first mandibular molars with two canals and mature root apices were assigned randomly to 2 groups, each group bad 16 teeth. 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. Root end cavities were examined under scanning electron microscope for further evaluation of the superficial debris and smear layer of the root end preparations. SPSS 13.0 software package was used for Kruskal Wallis test. RESULTS： Ultrasonic preparation had significantly less superficial debris and smear layer than slow-speed handpiece preparation （P〈0.05）. CONCLUSIONS： Ultrasonic instrument creates cleaner surfaces for root end cavities than slow-speed bandpiece preparation in posterior teeth root end preparation. Supported by Youth Fund from Bureau of Science and Technology of Guangxi Zhuang Autonomous Region （0339025）and Innovation Project of Guangxi Postgraduate Education （2006105981003M09）.