Manker A, Solanki M, Tripathi A, Jain M L
Department of Pedodontics and Preventive Dentistry, Sri Aurobindo College of Dentistry, SAIMS, Indore, India.
Department of Pedodontics and Preventive Dentistry, Modern Dental College and Research Centre, Indore, India.
Eur Arch Paediatr Dent. 2020 Apr;21(2):203-213. doi: 10.1007/s40368-019-00474-0. Epub 2019 Sep 5.
To evaluate nickel-titanium rotary systems, ProTaper Universal (PTU), ProTaper Next (PTN), self-adjusting file (SAF), and stainless steel hand K files in deciduous root canals in longitudinal and horizontal sections by three-dimensional reconstruction. Whether there was any difference in shaping ability, transportation, dentine removal, untouched canal surface area, and preparation time among the different groups when used in primary root canals.
Shaping and cleaning of canals in primary molars were done using the four systems, and CBCT and specialized software were used for scanning, image processing, three-dimensional reconstruction, and analysis of pre-operative and post-operative to evaluate the groups for their shaping properties, transportation, amount of dentine removal, untouched canal surface area, and preparation time in primary root canals.
None of the groups reported stripping of canals or instrument failure. SAF demonstrated less removal of dentine as compared to other groups. Hand K files presented with high untouched canal surface area, while it was least with SAF. In addition, rotary files provided faster preparation than hand files, and among the rotary systems, PTN took least time for cleaning and shaping of canals. All the groups were similar in transportation at cervical and apical third.
Under the conditions of this study, SAF seemed to result in more conservative and meticulous removal of dentine. This is desirable to preserve the integrity of thin-walled primary root canals. SAF also showed less untouched canal areas suggesting better contact with the primary canal walls. The rotary file groups required less clinical time which is important in paediatric treatments.
通过三维重建评估镍钛旋转系统（ProTaper Universal，PTU；ProTaper Next，PTN）、自调式锉（SAF）和不锈钢手动K锉在乳牙根管纵剖面和横剖面中的情况。在乳牙根管中使用时，不同组在根管预备能力、根管偏移、牙本质去除量、未触及的根管表面积和预备时间方面是否存在差异。
使用这四种系统对乳磨牙根管进行预备和清理，并使用锥形束计算机断层扫描（CBCT）和专业软件进行扫描、图像处理、三维重建，以及分析术前和术后情况，以评估各组在乳牙根管的预备特性、根管偏移、牙本质去除量、未触及的根管表面积和预备时间。
所有组均未出现根管壁侧穿或器械折断。与其他组相比，SAF去除的牙本质较少。手动K锉的未触及根管表面积较大，而SAF最小。此外，旋转锉比手动锉预备速度更快，在旋转系统中，PTN清理和预备根管所需时间最短。所有组在根管颈段和根尖段三分之一处的根管偏移情况相似。
在本研究条件下，SAF似乎能更保守、细致地去除牙本质。这对于保留薄壁乳牙根管的完整性是可取的。SAF还显示未触及的根管面积较小，表明与乳牙根管壁的接触更好。旋转锉组所需临床时间较少，这在儿科治疗中很重要。
