Evaluation of apical canal shapes produced sequentially during instrumentation with stainless steel hand and Ni-Ti rotary instruments using Micro-computed tomography.
10.5395/JKACD.2011.36.3.231
- Author:
Woo Jin LEE
1
;
Jeong Ho LEE
;
Kyung A CHUN
;
Min Seock SEO
;
Yeon Jee YOO
;
Seung Ho BAEK
Author Information
1. Department of Conservative Dentistry and Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea. shbaek@snu.ac.kr
- Publication Type:Original Article ; Randomized Controlled Trial
- Keywords:
LightSpeed;
Master apical file;
Micro CT, ProFile;
Stainless steel K-file;
Transportation
- MeSH:
Dental Pulp Cavity;
Dentin;
Hand;
Humans;
Molar;
Nickel;
Stainless Steel;
Titanium;
Tooth;
Tooth Apex;
Transportation;
X-Ray Microtomography
- From:Journal of Korean Academy of Conservative Dentistry
2011;36(3):231-237
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
OBJECTIVES: The purpose of this study was to determine the optimal master apical file size with minimal transportation and optimal efficiency in removing infected dentin. We evaluated the transportation of the canal center and the change in untouched areas after sequential preparation with a #25 to #40 file using 3 different instruments: stainless steel K-type (SS K-file) hand file, ProFile and LightSpeed using microcomputed tomography (MCT). MATERIALS AND METHODS: Thirty extracted human mandibular molars with separated orifices and apical foramens on mesial canals were used. Teeth were randomly divided into three groups: SS K-file, Profile, LightSpeed and the root canals were instrumented using corresponding instruments from #20 to #40. All teeth were scanned with MCT before and after instrumentation. Cross section images were used to evaluate canal transportation and untouched area at 1- , 2- , 3- , and 5- mm level from the apex. Data were statistically analyzed according to' repeated nested design'and Mann-Whitney test (p = 0.05). RESULTS: In SS K-file group, canal transportation was significantly increased over #30 instrument. In the ProFile group, canal transportation was significantly increased after preparation with the #40 instrument at the 1- and 2- mm levels. LightSpeed group showed better centering ability than ProFile group after preparation with the #40 instrument at the 1 and 2 mm levels. CONCLUSIONS: SS K-file, Profile, and LightSpeed showed differences in the degree of apical transportation depending on the size of the master apical file.
