两种新型镍钛系统对老年人磨牙弯曲根管预备成形能力的效果评价

Comparison of shaping ability of two new nickel titanium rotary system to molars based on microcomputed tomography in the elderly

目的比较两种新型旋转镍钛系统ProTaperNext和WaveOneGold与传统镍钛系统ProTaperUnieversal预备老年人磨牙弯曲根管的效果。方法收集老年人离体磨牙样本30颗(96个根管),随机分成3组,分别使用传统的ProTaperUnieversal镍钛系统(PTU组)及两种新型的WaveOneGold镍钛系统(WOG组)和ProTaperNext镍钛系统(PTN组)预备根管至#25,记录预备时间。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、预备前后体积、表面积变化以及5个水平的中心偏移情况。结果WOG组预备根管时间为(61.0±7.1)s,明显短于PTN组(135.0±8.4)s和PTU组(259.0±8.4)s(F=11.553、P=0.007);3组器械预备完根管后均有明显的体积增加,PTU组体积增加(6.794±2.430)mm^(2),大于WOG组(4.997±2.260)mm^(2)和PTN组(4.554士1.988)mm^(2),差异有统计学意义(F=2.673、P=0.022);WOG组、PTN组和PTU组表面积增加(17.397±6.445)mm^(2)(17.370±6.768)mm^(2)、(18.907±6.545)mm^(2),差异无统计学意义(F=0.063、P=0.805);3组在第1、2、4、5个水平截面的中心偏移距离差异均无统计学意义(均P>0.05)。在第3截面,PTU组中心偏移距离(0.103±0.028)mm,大于PTN组(0.071±0.016)mm和WOG组(0.087土0.025)mm,差异有统计学意义(F=8.007、P=0.005)。结论新型镍钛锉系统ProTaperNext和WaveOneGold系统预备老年人磨牙根管所用时间更短,根管中段的中心偏移更小,更高效且安全。

Objective To compare the effectiveness of two new rotary nickel-titanium systems,ProTaper Next and WaveOne Gold,with the conventional nickel-titanium system,ProTaper Universal,in the preparation of curved root canals in older molar teeth.Methods Thirty molars(96 canals)were divided into 3 experimental groups and instrumented using the ProTaper Universal system(PTU group),WaveOne Gold system(WOG group),and ProTaper Next system(PTN group)up to#25.The root canals were scanned and reconstructed using micro-computed tomography(CT)before and after preparation.Measurements were taken to compare the preparation time,changes in volume and surface area before and after preparation,and center shifts at five levels between the two groups.I Results The WOG group had a shorter preparation time(61.0±7.1)s,compared to the PTN group(135.0±8.4)s and the PTU group(259.0±8.4)s(F=11.553,P=0.007).After root canal preparation,the volume of canals in all three groups significantly increased.The PTU group had the largest increase in volume(6.794±2.430)mm^(2),followed by the WOG group(4.997±2.260)mm^(2)and the PTN group(4.554±1.988)mm,with statistical significance(F=2.673,P=0.022).The surface area of the WOG group,PTN group and PTU group increased by(17.397±6.445)mm^(2),(17.370±6.768)mm^(2)and(18.907±6.545)mm^(2),respectively.However,the difference in surface area was not statistically significant(F=0.063,P=0.805).There was no significant difference in canal center transportation among the three groups(all P>0.05).In the third horizontal section,the PTU group had a higher canal center transportation[(0.103±0.028)mm]compared to the PTN group[(0.071±0.016)mm]and WOG group[(0.087±0.025)mm](F=8.007,P=0.005).Conclusions The ProTaper Next and Wave One Gold systems,which are made of nickel-titanium,offer a faster and safer method for preparing root canals in elderly molars.These systems not only reduce the preparation time but also minimize the center deviation in the middle section of the root canal,thereby enhancing efficiency and safety.