Park Sung-Kyung, Kim Young-Jae, Shon Won-Jun, You Sung-Yeop, Moon Young-Mi, Kim Hyeon-Cheol, Lee WooCheol
Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, Korea.
Department of Pediatric Dentistry, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, Korea.
Scanning. 2014 Mar-Apr;36(2):246-51. doi: 10.1002/sca.21096. Epub 2013 Apr 29.
The application of the single-file technique using the reciprocating motion is gaining concern in root canal preparation. The purpose of this research is to compare the efficiency of the reciprocating motion-employing files (RECIPROC and WaveOne) by measuring the working time for complete canal shaping, and to evaluate their reusability under scanning examinations. One hundred curved root canals of the extracted molars were used. The working length was determined and the glide path was confirmed using a #15 K-file. Canals shaping was completed to the length either with RECIPROC R25 file (n = 50), or with WaveOne Primary file (n = 50). The time taken for the file to reach the working length was also measured. Each file was repeatedly used in a maximum of 10 canals for comparing the change of the efficiency (shaping time) according to the working length, canal curvature, and number of file re-use. The deformations or surface defects of the files after the in vitro use were observed using a scanning electron microscope (SEM). There was no difference under the SEM between the 2 file groups with no initiation of micro-cracks until they were re-used up to 5 canals. WaveOne Primary file showed significantly shorter working time than RECIPROC R25 (p < 0.05). There was a statistically significant correlation between the working time and three variables. As the working length and the curvature of the canal increased, the shaping time was increased in both file systems. Reusability of these reciprocating instruments might be maximum 5 canals with minimal surface deformations.
使用往复运动的单根管技术在根管预备中日益受到关注。本研究的目的是通过测量完成根管塑形的工作时间来比较采用往复运动的锉（RECPROC和WaveOne）的效率，并在扫描检查下评估它们的可重复使用性。使用了100颗拔除磨牙的弯曲根管。确定工作长度并使用#15 K锉确认引导通路。分别使用RECPROC R25锉（n = 50）或WaveOne Primary锉（n = 50）将根管塑形至该长度。还测量了锉到达工作长度所需的时间。每个锉最多在10个根管中重复使用，以比较根据工作长度、根管弯曲度和锉重复使用次数的效率（塑形时间）变化。使用扫描电子显微镜（SEM）观察体外使用后锉的变形或表面缺陷。在SEM下，两个锉组之间没有差异，直到它们重复使用5个根管才开始出现微裂纹。WaveOne Primary锉的工作时间明显短于RECPROC R25（p < 0.05）。工作时间与三个变量之间存在统计学上的显著相关性。随着工作长度和根管弯曲度的增加，两种锉系统的塑形时间均增加。这些往复式器械的可重复使用性可能最多为5个根管，且表面变形最小。
