왕복회전식 니켈-티타늄 파일을 이용한 근관 형성 시 발생하는 회전력 및 수직력에 대한 평가
Assessment of torque and apical load during root canal preparation using reciprocating nickel-titanium files
유연지, 임범순, 김진우, 백승호, 이인복,
소속 상세정보
유연지 ( Yoo Yeon-Jee ) - 서울대학교 치의학대학원 치과보존학교실
임범순 ( Lim Bum-Soon ) - 서울대학교 치의학대학원 치과생체재료과학교실
김진우 ( Kim Jin-Woo ) - 강릉대학교 치과대학 치과보존학교실
백승호 ( Baek Seung-Ho ) - 서울대학교 치의학전문대학원 치과보존학교실
이인복 ( Lee In-Bog ) - 서울대학교 치의학대학원 치과보존학교실
KMID : 1035320140410010009
Abstract
The purpose of this study was to investigate the torque and apical load generated during root canal preparation using reciprocating nickel-titanium (NiTi) files in reciprocating or continuous rotating motions. Twenty resin blocks with simulated L-shaped canal were pre-prepared and randomly assigned to four experimental groups for canal preparation: Group RPR, Reciproc R25 file in reciprocating motion; Group RPC, Reciproc R25 file in continuous rotating motion; Group WOR, WaveOne Primary file in reciprocating motion; Group WOC, WaveOne Primary file in continuous rotating motion. The apical load and torque generated during canal preparation were recorded using the laboratory-made load-torque measurement device, and analyzed with the torsional properties of the files. When the files were used in reciprocating motion, the number of pecking stroke, the peak apical load and peak reverse apical load were significantly higher (p<0.05), whereas the peak torque was not significantly different (p>0.05). The peak torque and peak reverse apical load in Reciproc R25 were significantly higher than in WaveOne Primary (p<0.05). The peak torque and peak reverse apical load were positively correlated. The two NiTi files showed bi-phasic elastic deformation under torsional stress, and Reciproc R25 maintained elastic property to higher rotational angles compared to WaveOne Primary (p<0.05). The torque values at yield point and maximum point, and toughness value under fracture point were not significantly different between the files (p>0.05). In conclusion, the torque and apical load during canal preparation differed according to the files and rotating method. Within the limitations of the present study, Reciproc R25 showed significantly higher torque and reverse apical load in both reciprocating and continuous rotating motions, thus requires caution in clinical application.
키워드
apical load; NiTi file; reciprocating motion; torque; yield point
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