三种连续旋转单支锉对弯曲根管成形能力的比较研究

A Comparative Study on the Shaping Ability in Curved Root Canals of Three Different Rotary Single File Instruments.

目的:通过比较三种连续旋转单支锉M3-L铂金2018款,锋将Ez-one和OneShape预备根管后根管偏移程度和角度的变化,评估其对L形单弯树脂模拟根管的成形能力,为其临床应用提供实验依据。方法:将30个L形单弯树脂模拟根管随机分为三组,分别使用M3-L、Ez-one、OneShape预备根管,数码相机采集预备前后根管图像,Adobe Photoshop CC 2018软件图像重叠后,Image View软件测量预备后10个观测水平的内、外壁树脂去除量、根管偏移及根管弯曲度。采用SPSS 28.0软件进行统计分析,三组均数间比较采用单因素方差分析,不同组间根管成形能力采用LSD两两比较。结果:根管预备后,三组树脂弯曲根管的弯曲角度均有所减少,组间差异无统计学意义(P>0.05)。中心定位能力的结果显示,在距根尖1 mm处,M3-L组的中心定位力显著优于Ez-one组(P<0.05),OneShape组与Ez-one组均向弯曲外侧偏移,而M3-L组向弯曲内侧偏移。在距根尖2~6 mm处,M3-L组的偏移量与OneShape组及Ez-one组相比具有统计学意义,且在2 mm处Ez-one组偏移量最小,中心定位能力较好(P<0.05)。而在3、4测量点处OneShape组表现出了最小的偏移量,在第7、8测量点处OneShape组偏移量最大,在第8、9测量点,M3-L组表现出了最小的偏移量,在9、10测量点Ez-one组的偏移程度均大于M3-L组与OneShape组。结论:在根管弯曲段Ez-one与OneShape成形能力较好,M3-L根尖偏移量较少,三种镍钛器械均能够很好地维持根管原始走向,表现出了较好的成形能力。

Objective Compare the effect of M3-L platinum 2018,Feng jiang Ez-one and OneShape file on the change in canal transportation and angle of curvature and evaluate the shaping ability by the three different rotary nickel-titanium files in simulated curved canal in resin blocks,and to provide experimental basis for its clinical application.Methods Thirty single-curved lear resin canal blocks were divided into 3 groups with 10 in each group randomly.Three kinds of Ni-Ti rotary files were used to prepare the canal blocks.Standardized photographs of pre-and post-instrumentation were superimposed by Adobe Photoshop CC 2018 software.Measurements were taken of the quantity of resin removed from the inner and outer walls of the curvature at 10 levels,curvature angles and transportation of the canal.SPSS 28.0 software was used for statistical analysis,one-way Anova was used among the 3 groups,and LSD was used to compare the shaping ability of different groups.Results After root canal preparation,the angle of curvature of resin curved root canals decreased in the three groups,and there was no signifi cant diff erence between the groups(P>0.05).Center positioning ability:The centering ability of M3-L group was signifi cantly better than that of Ez-one group(P<0.05)at the distance of 1 mm from the apical.Both the OneShape and Ez-one moved toward the lateral side of the curve,while the M3-L moved toward the medial side of the curve.At 2-6 mm,the transportation of M3-L group was statistically significant compared with OneShape and Ez-one,at 2 mm,Ez-one was the smallest and the center positioning ability was better(P<0.05),while at 3 and 4 measurement points,the off set of OneShape was the smallest.At 7 and 8 measurement points,OneShape had the largest off set,and at 8 and 9 measurement points,the M3-L showed the smallest off set.At 9 and 10 measurement points,the off set of EZ-one was greater than that of M3-L and OneShape.Conclusion Ez-one and OneShape have good shaping ability in the curved root canal,and M3-L has less apical deviation.The three kinds of Niti instruments can maintain the original direction of root canal and show good shaping ability.