Effects of four Ni-Ti preparation techniques on root canal geometry assessed by micro computed tomography
Effects of four Ni-Ti preparation techniques on root canal geometry assessed by micro computed tomography
复制标题
DOI：
10.1046/j.1365-2591.2001.00373.x
复制
发表时间：
2001-04-01
影响因子：
5
通讯作者：
Laib, A
中科院分区：
文献类型：
--
作者：
Peters, OA;Schönenberger, K;Laib, A
目的 本研究的目的是使用三维重建的人上颌磨牙根管，比较四种制备技术对根管体积和表面积的影响。此外，μ CT 数据用于描述与四种制备技术相关的形态参数。方法学使用微型计算机断层扫描仪分析拔除的上颌磨牙的根管。使用 Ni-Ti - K-Files、光速仪器、Profile .04 和 GT 旋转仪器在根管准备之前和之后扫描标本。使用专门开发的软件计算去除的牙本质体积、根管矫直度、未改变面积的比例和根管运输的差异。 结果 根管内器械增加了根管的体积和表面积，制备好的根管比未制备的根管明显更圆、直径更大并且更直。然而，所有仪器技术都使 35% 或更多的根管表面积保持不变。虽然所研究的三种根管类型之间存在显着差异，但在仪器类型方面发现的差异非常小。结论 在 mu CT 系统的限制内，所使用的四种根管仪器技术之间几乎没有差异。相比之下，根管解剖结构变化的强烈影响被证明，需要使用 3D 技术进行进一步研究，以充分了解根管预备的生物力学方面。
Aim The aim of this study was to compare the effects of four preparation techniques on canal volume and surface area using three-dimensionally reconstructed root canals in extracted human maxillary molars. In addition, mu CT data was used to describe morphometric parameters related to the four preparation techniques.Methodology A micro computed tomography scanner was used to analyse root canals in extracted maxillary molars. Specimens were scanned before and after canals were prepared using Ni-Ti - K-Files, Light speed instruments, Profile .04 and GT rotary instruments. Differences in dentine volume removed, canal straightening, the proportion of unchanged area and canal transportation were calculated using specially developed software.Results Instrumentation of canals increased volume and surface area, Prepared canals were significantly more rounded, had greater diameters and were straighter than unprepared canals. However, all instrumentation techniques left 35% or more of the canals' surface area unchanged. Whilst there were significant differences between the three canal types investigated, very few differences were found with respect to instrument types.Conclusions Within the limitations of the mu CT system, there were few differences between the four canal instrumentation techniques used. By contrast, a strong impact of Variations of canal anatomy was demonstrated, Further studies with 3D-techniques are required to fully understand the biomechanical aspects of root canal preparation.