Effect of repetitive pecking at working length for glide path preparation using G-file
하정홍, 전효진, Abed Rashid El, 장석우, 김성교, 김현철,
소속 상세정보
하정홍 ( Ha Jung-Hong ) - Kyungpook National University School of Dentistry Department of Conservative Dentistry
전효진 ( Jeon Hyo-Jin ) - Pusan National University School of Dentistry Department of Conservative Dentistry
( Abed Rashid El ) - Dubai Health Authority Department of Dentistry Endodontic Unit
장석우 ( Chang Seok-Woo ) - Kyung hee University School of Dentistry Department of Conservative Dentistry
김성교 ( Kim Sung-Kyo ) - Kyungpook National University School of Dentistry Department of Conservative Dentistry
김현철 ( Kim Hyeon-Cheol ) - Pusan National University School of Dentistry Department of Conservative Dentistry
KMID : 1034420150400020123
Abstract
Objectives: Glide path preparation is recommended to reduce torsional failure of nickel-titanium (NiTi) rotary instruments and to prevent root canal transportation. This study evaluated whether the repetitive insertions of G-files to the working length maintain the apical size as well as provide sufficient lumen as a glide path for subsequent instrumentation.
Materials and Methods: The G-file system (Micro-Mega) composed of G1 and G2 files for glide path preparation was used with the J-shaped, simulated resin canals. After inserting a G1 file twice, a G2 file was inserted to the working length 1, 4, 7, or 10 times for four each experimental group, respectively (n = 10). Then the canals were cleaned by copious irrigation, and lubricated with a separating gel medium. Canal replicas were made using silicone impression material, and the diameter of the replicas was measured at working length (D0) and 1 mm level (D1) under a scanning electron microscope. Data was analysed by one-way ANOVA and post-hoc tests (p = 0.05).
Results: The diameter at D0 level did not show any significant difference between the 1, 2, 4, and 10 times of repetitive pecking insertions of G2 files at working length. However, 10 times of pecking motion with G2 file resulted in significantly larger canal diameter at D1 (p < 0.05).
Conclusions: Under the limitations of this study, the repetitive insertion of a G2 file up to 10 times at working length created an adequate lumen for subsequent apical shaping with other rotary files bigger than International Organization for Standardization (ISO) size 20, without apical transportation at D0 level.
키워드
Apical size; G file; Glide path; Nickel-titanium rotary file; Transportation
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