三种机用镍钛器械对中度弯曲根管成型能力的分析

发布时间：2018-06-30 00:16

本文选题：根管预备 + 镍钛器械　；参考：《新疆医科大学》2017年硕士论文

【摘要】：目的:比较Protaper next、Waveone、Twisted File Adaptive(TFA)三种机用镍钛器械对中度弯曲透明树脂模拟根管的成型能力的影响,为临床应用提供实验依据。方法:选取80个中度弯曲(20°)树脂模拟根管按随机数字表法等分为4组,即TFA组(T组)、Waveone组(W组)、Protaper next组(P组)与不锈钢K挫组(K组),每组20个根管,分别采用Twisted File Adaptive(TFA)挫、Waveone挫、Protaper next挫及不锈钢K挫进行根管预备,记录根管预备时间,测定预备后根管工作长度,扫描仪获取预备前后树脂模拟根管图像,使用Adobe PhotoshopCS5.0和ImageJ软件进行图像重叠并分别测量根管弯曲度的变化、根尖偏移情况,记录轴中心率,从相距根尖孔1mm处开始作为一个观测点,分别取3个观测点,即:选择树脂模拟根管距离根尖孔3、5、7mm。统计学分析计量资料采用单因素方差分析,两两比较采用Dunnett分析和t检验,检验水准?=0.05。结果:(1)W组根管预备时间最短,T组次之,K组最长,四组比较差异有统计学意义(P0.05)。4种器械预备后根管工作长度变化值差异无统计学意义(P0.05);(2)距根尖孔3、5、7 mm截面,T组偏移量最小,与其他各组对比差异有统计学意义(P0.05),W组次之,K组偏移量最大(P0.05),T组轴中心率最高,其次为W组、P组,K组最低,四组轴中心率对比差异有统计学意义(P0.05);(3)预备前,各组弯曲度对比差异无统计学意义(P0.05),预备后,各组弯曲度均降低,以K组弯曲度降低最为明显,T组弯曲度变化幅度最小。结论:TFA镍钛机用器械对中度弯曲树脂模拟根管成型能力好,弹性性能高,韧度强,中心定位能力较高,偏移较少。
[Abstract]:Objective: to compare the effects of three kinds of machine Ni-Ti instruments on the formability of medium bending transparent resin to simulate root canal, and to provide experimental basis for clinical application. Methods: 80 moderately curved (20 掳) resin simulated root canals were randomly divided into 4 groups: TFA group (T group), Waveone group (W group), Protaper next group (P group) and stainless steel K frustration group (K group), with 20 root canals in each group. Root canal preparation was performed with Twisted File Adaptive (TFA) Waveone Protaper next cadaver and stainless steel K cadaver respectively. The root canal preparation time was recorded, the working length of root canal was measured, and the simulated root canal images were obtained by scanners before and after preparation. Adobe Photoshop CS5.0 and ImageJ software were used to perform image overlap and to measure the change of root canal curvature, root tip deviation and axis center rate respectively. From the point of 1mm distance from the apical foramen to the root tip, three observation points were selected, respectively. That is to say, selecting resin to simulate the root canal distance from the apical foramen 3 to 5, 7 mm. The measurement data of statistical analysis were analyzed by single factor ANOVA, Dunnett analysis and t test were used in the comparison, the test level was 0. 05%. Results: (1) the shortest root canal preparation time in group W was the longest in group K, and the difference among the four groups was statistically significant (P0.05). There was no significant difference in the working length of root canal between group W and group T (P0.05); (2). Compared with other groups, the difference was statistically significant (P0.05) the deviation of group K was the largest (P0.05), the rate of axial center of group T was the highest, and that of group W was the lowest (P0.05); (3). There was no significant difference in the curvature of each group (P0.05). After preparation, the curvature of each group decreased, especially in group K the most obvious decrease in the curvature of T group was the smallest. Conclusion the wee TFA Nickel-Titanium Machine has the advantages of good forming ability, high elasticity, high toughness, high center location ability and less deviation to the medium bending resin for simulating root canal formation.
【学位授予单位】：新疆医科大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R781.05

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