The experimental study of the effect of the hybrid instrumentation method with ProTaper and ProFile on the change of root canal area and distance from the canal to the root surface after canal shaping.

Kim,  Seok-Min; Park,  Dong-Sung

J Korean Dent Assoc > Volume 45(6); 2007 > Article

The Journal of The Korean Dental Association 2007;45(6):362-369.
Published online June 30, 2007.

ProTaper와 ProFile을 사용한 Hybrid instrumentation method의 근관 형성 전, 후 근관 단면적과 근관벽에서 치근외면까지 최단거리의 변화에 미치는 영향에 대한 실험적 연구

김석민¹, 박동성²

^¹성균관대학교 의과대학 삼성서울병원 치과보존과
^²성균관대학교 의과대학 삼성서울병원 치과보존과

The experimental study of the effect of the hybrid instrumentation method with ProTaper and ProFile on the change of root canal area and distance from the canal to the root surface after canal shaping.

Seok-Min Kim¹, Dong-Sung Park²

¹Department of Conservative Dentistry, Samsung Medical Center, Sungkyunkwan University School of Medicine
²Department of Conservative Dentistry, Samsung Medical Center, Sungkyunkwan University School of Medicine

Abstract

The aim of this study was to investigate the effect of the hybrid instrumentation method with ProTaper and ProFile on the change of root canal area and distance from the canal to the root surface after canal shaping. The mesial canals of twenty extracted mandibular first molars having 10-20°Delta curvature were scanned using X-ray microcomputed tomography (XMCT)-scanner before root canals were instrumented. They were divided into four groups (n=10 canals ter group). In Group 1, root canals were instrumented by the step-back technique with stainless steel K-Flexofile after coronal flaring. The remainders were instrumented by the crown-down technique with, ProTaper system (Group 2), ProFile (Group 3) or ProTaper (Group 4). All canals were prepared up to size 25 at the end-point of preparation and scanned again. Pre- and post-operative cross-sectional images of 1, 3, 5, and 7 mm from the apical foramen were compared. For each level, change of cross-sectional canal are and distance to the nearest external root surface was calculated using Adobe Photoshop 6.0 and image software program. In the change of cross-sectional area, Group 4 was less than Group 2 at 3 mm and 5 mm level (p<0.05). In the difference of the distance from the canal to the root surface after canal shaping, Group 4 was least among the other groups at 7 mm level (p<0.05). According to the results, the methods using ProFile or K file only and the hybrid instrumentation technique using ProTaper and ProFile are more appropriate methods of canal preparation than ProTaper system for narrow of curved canals.

Key Words: Hybrid instrumentation technique;ProFile;ProTaper;X-ray micro-computed tomography;