Comparison of the centering ratio and canal curvature reduction according to the apical preparation size using various NiTi rotary instruments

Kwak,  Sang-Won; Park,  Jeong-Kil; Hur,  Bock; Kim,  Hyeon-Cheol

J Korean Dent Assoc > Volume 47(7); 2009 > Article

The Journal of The Korean Dental Association 2009;47(7):435-443.
Published online July 31, 2009.

근단부 성형 크기에 따른 다양한 전동 니켈티타늄 파일의 중심 변위율 및 만곡도 감소 비교

곽상원¹, 박정길², 허복³, 김현철⁴

^¹부산대학교 치의학전문대학원 치과보존학교실
^²부산대학교 치의학전문대학원 치과보존학교실
^³부산대학교 치의학전문대학원 치과보존학교실
^⁴부산대학교 치의학전문대학원 치과보존학교실

Comparison of the centering ratio and canal curvature reduction according to the apical preparation size using various NiTi rotary instruments

Sang-Won Kwak¹, Jeong-Kil Park², Bock Hur³, Hyeon-Cheol Kim⁴

¹Department of Conservative Dentistry, School of Dentistry, Pusan National University
²Department of Conservative Dentistry, School of Dentistry, Pusan National University
³Department of Conservative Dentistry, School of Dentistry, Pusan National University
⁴Department of Conservative Dentistry, School of Dentistry, Pusan National University

Abstract

The purpose of this study was to compare the centering ratio and reduction of canal curvature according to the preparation sizes of #30, #40 and #50 using three rotary NiTi instruments which have different shaft tapers. Seventy-two simulated root canals in clear resin blocks (Endo Training Bloc; Dentsply Maillefer, Ballaigues, Switzerland) were divided as following 3 groups according to the file system; the 24 canal blocks prepared with each of ProTaper Universal system (Group P), LightSpeed eXtra system (Group L), and K3 (Group K). The pre- and post-instrumented root canals were scanned and superimposed to evaluate and calculate the centering ratio and reduction of canal curvature. Mean scores of each group were statistically analyzed using one-way ANOV A and Duncan's multiple range test for post-hoc comparison. The results were as followings: 1. Group L showed better centering ratio, followed by K and P. And all experimental groups generally showed increasing tendency of centering ratio as the apical size was increasing from #30 to #50, except at 1 mm level of group P where showed reducing tendency of centering ratio. The smaller the ratio, the better the instrument remained centered in the canal. 2. Group P showed more decrease of canal curvature at all apical shaping size (p < 0.05). Under the conditions of this study, the shaft design could affect the quality of canal shaping and the smooth taperless flexible (LightSpeed) shaft design was capable of preparing canals with good morphological characteristics in curved canals.

Key Words: LightSpeed eXtra;ProTaper Universal;K3;shaft taper;centering ratio;Canal curvature;