两种镍钛系统预备根管的有效性与安全性研究  

Comparison of effectiveness and safety between Twisted File technique and ProTaper Universal rotary full sequence based on micro-computed tomography

作　　者：陈晓播[1] 陈晨[1] 梁宇红[1] 

机构地区：[1]北京大学口腔医学院.口腔医院牙体牙髓科,北京100081

出　　处：《北京大学学报（医学版）》2016年第1期101-104,共4页Journal of Peking University:Health Sciences

基　　金：北京大学口腔医院青年科研基金(PKUSS20120201)资助~~

摘　　要：目的:比较两种旋转镍钛系统Twisted File(TF)和Pro Taper Universal(PU)预备根管的有效性和安全性。方法:收集离体磨牙样本20颗(62个根管),随机分成2组,分别使用TF和PU按照推荐程序预备根管至#25/0.08,记录预备时间(使用每支镍钛锉的累加时间)。利用立体显微镜在25倍放大下观察并记录两组牙齿预备前后根尖3 mm区域牙根表面裂纹,应用Micro-CT对预备前后根管形态进行扫描重建分析,比较两组根管预备时间以及根管中心偏移等三维形态变化。结果:TF组每根管的平均预备时间为(0.53±0.14)min,明显短于PU组(2.06±0.39)min(P<0.05)。在根管中段,两实验组根管中心偏移量分别为:TF组(0.070±0.056)mm、PU组(0.097±0.084)mm,差异具有统计学意义(P<0.05)。TF组和PU组在预备过程中均未发生器械折断;根管预备完成后,3D表面重建分析以及立体显微镜下观察,两组均未见牙根裂纹的产生。结论:与PU相比,TF镍钛系统预备磨牙根管所用时间短,效率高;TF根管中段的中心偏移小,成形效果好,优于PU。Objective ： To evaluate the efficacy and security of two type of rotary nickel titanium system （Twisted File and ProTaper Universal） for root canal preparation based on micro-computed tomography （micro-CT）. Methods： Twenty extracted molars （including 62 canals） were divided into two experimen- tal groups and were respectively instrumented using Twisted File rotary nickel titanium system （TF） and ProTaper Universal rotary nickel titanium system （PU） to #25/0.08 following recommended protocol. Time for root canal instrumentation （accumulation of time for every single file） was recorded. The 0 -3 mm root surface from apex was observed under an optical stereomieroscope at 25 x magnification. The presence of crack line was noted. The root canals were scanned with micro-CT before and after root canal preparation. Three-dimensional shape images of canals were reconstructed, calculated and evaluated. The amount of canal central transportation of the two groups was calculated and compared. Results：The shorter preparation time [ （0.53 ±0.14） mini was observed in TF group, while the preparation time of PU group was （2.06 ± 0.39 ） rain （P 〈 0.05 ）. In mid-root level, TF group shaping resulted in less ca- nal center transportation than PU group [ （0. 070± 0. 056） mm vs. （0. 097± 0. 084） mm, P 〈 0.05 ） No instrument separation was observed in both the groups. Cracks were not found in both the groups ei- ther based in micro-CT images or observation under an optical stereomicroscope at 25 x magnification. Conclusion： Compared with ProTaper Universal, Twisted File took less time in root canal preparation and exhibited better shaping ability, and less canal transportation.

关 键 词：镍 钛 合金 根管制备 X线显微体层摄影术 

分 类 号：R781.33[医药卫生—口腔医学]