PDF(Pubmed)
Abstract：
The introduction of nickel-titanium (NiTi) rotary instruments improved the root canal preparation of the narrow and curved root canals, especially after the introduction of thermomechanical treated (NiTi) alloys that have a high flexibility to prepare the curved canal reducing the common clinical complication, such as fracture, the change of the original shape of the root canal as a result of the change in the curvature of the curved root canal, the change of the working length which caused by the creation of the ledges, canal transporting and zipping especially in medium and highly curved canal. This study aimed to compare the shaping ability of two heat-treated nickel-titanium single file systems using reciprocation motion and rotary motion in curved canals. Materials and methods Thirty extracted human teeth with one curved root at 25 to 56 degrees were used, two NiTi single file systems were used to prepare the curved root canal in two groups: Reciproc R25 (Munich, Germany: VDW) group (n=15) and One Curve (Besancon, France: Micro-Mega) group (n=15). Curved root canal instrumentation outcomes were evaluated using cone-beam computed tomography (CBCT). Kruskal-Wallis with Bonferroni post hoc test was used to assess differences between working length, the angle and radius of curvature after instrumentation. Results There was a significant difference in angle and radius of curvature (-1.83° One Curve, -2.25° Reciproc blue and -0.18 mm One Curve, -0.19 mm Reciproc blue, respectively) (p<0.05) after instrumentation for both One Curve and Reciproc blue groups, and there was no significant difference in working length change (-0.16 mm One Curve, -0.32 mm Reciproc blue) after instrumentation of both One Curve and Reciproc blue groups (p>0.05). Conclusion The Reciproc blue single file system with reciprocation movement and One Curve with continuous movement cause a significant difference in curvature and radius of curved root canal affecting the original shape of the root canal with no significant difference in working length of the curved root canal.
摘要：
镍钛（NiTi）旋转器械的引入改善了狭窄和弯曲根管的根管预备，特别是在引入热机械处理（NiTi）合金后，具有很高的灵活性，以制备弯曲的管道，减少常见的临床并发症，如骨折，由于弯曲根管曲率的变化而导致的根管原始形状的变化，由壁架的创建引起的工作长度的变化，运河运输和拉链特别是在中等和高度弯曲的运河。这项研究旨在比较两种热处理的镍钛单文件系统在弯曲的运河中使用往复运动和旋转运动的成形能力。材料和方法使用30颗拔除的人类牙齿，其中一个弯曲的根部在25至56度，两个NiTi单文件系统用于准备两组弯曲的根管：ReciprocR25（慕尼黑，德国：VDW)组(n=15)和一条曲线(Besancon，法国:Micro-Mega)组(n=15)。使用锥形束计算机断层扫描（CBCT）评估弯曲的根管器械结果。Kruskal-Wallis与Bonferroni事后检验用于评估工作长度之间的差异，仪器后的角度和曲率半径。结果角度和曲率半径存在显著差异(-1.83°一曲线,-2.25°Reciproc蓝色和-0.18mm单曲线，-0.19毫米Reciproc蓝色，分别）（p<0.05），工作长度变化无显著差异(-0.16mmOneCurve,-0.32mmReciproc蓝色）在OneCurve和Reciproc蓝色组的仪器后（p>0.05）。结论具有往复运动的Reciproc蓝色单文件系统和具有连续运动的OneCurve系统导致弯曲根管的曲率和半径存在显着差异，影响了根管的原始形状，而弯曲根管的工作长度没有显着差异。
