Plotino G, Grande N M, Porciani P F
Private Practice, Grande, Plotino & Torsello - Studio di Odontoiatria, Rome, Italy.
Int Endod J. 2015 Feb;48(2):199-205. doi: 10.1111/iej.12302. Epub 2014 Jun 28.
To investigate the incidence of fracture and deformation observed on Reciproc instruments after clinical use.
A total of 1696 Reciproc NiTi instruments that were discarded after normal clinical usage over 30 months were collected. Of these 1580 instruments were R25 (93%), 76 were R40 (5%), and 40 were R50 (2%). The treatments included 3780 root canal preparations, 3023 primary treatments and 757 retreatments. Root canal preparation was standardized and followed the manufacturer's directions for the use of Reciproc files without creating prior glide path with hand instruments. In retreatment cases, Reciproc R25 instrument was used to remove all filling material and to complete the preparation. Each instrument was used for shaping only one tooth. All the instruments used were inspected under a microscope to detect signs of fracture or deformation and, if any fracture existed, the length of the files was measured. Data were analysed using a chi-square test with a level of significance set at P < .05.
A total of 8 Reciproc R25 instruments fractured during treatment, which represents 0.47% of the number of instruments used and 0.21% of the root canals treated. Five instruments fractured in primary treatment cases and three instruments during retreatments. Six Reciproc R25 deformed during clinical use (0.35% of the number of instruments used and 0.15% of the root canals treated), four during retreatments and two during primary treatments. The deformation reported was unwinding of the blades, one at 1 mm from the tip and five between 2 and 3 mm from the tip. No deformations or fracture were registered for the Reciproc R40 and R50 instruments.
Root canal instrumentation following the manufacturer's instructions can be performed with Reciproc instruments with a very low incidence of instrument fracture and deformation.
调查临床使用后Reciproc器械上观察到的折断和变形发生率。
收集了在30个月正常临床使用后废弃的1696支Reciproc镍钛器械。其中1580支为R25型（93%），76支为R40型（5%），40支为R50型（2%）。治疗包括3780次根管预备、3023次初次治疗和757次再治疗。根管预备标准化，遵循制造商使用Reciproc锉的说明，不先用手动器械建立引导通道。在再治疗病例中，使用Reciproc R25器械去除所有充填材料并完成预备。每支器械仅用于一颗牙齿的成形。使用的所有器械均在显微镜下检查以检测折断或变形迹象，若存在任何折断，测量锉的长度。采用卡方检验分析数据，显著性水平设定为P <.05。
共有8支Reciproc R25器械在治疗期间折断，占使用器械数量的0.47%，占治疗根管数量的0.21%。5支器械在初次治疗病例中折断，3支在再治疗期间折断。6支Reciproc R25在临床使用期间变形（占使用器械数量的0.35%，占治疗根管数量的0.15%），4支在再治疗期间变形，2支在初次治疗期间变形。报告的变形为锉刃松开，1支在距尖端1 mm处，5支在距尖端2至3 mm处。Reciproc R40和R50器械未记录到变形或折断。
按照制造商说明使用Reciproc器械进行根管预备时，器械折断和变形的发生率非常低。
