Fitness of Gutta-percha Cones in Curved Root Canals Prepared with Reciprocating Files Correlated with Tug-back Sensation

• Published in: Journal of endodontics Vol. 41; no. 1; pp. 102 - 105
• Main Authors: Yoon, Heeyoung, DDS, MSD, Baek, Seung-Ho, DDS, MSD, PhD, Kum, Kee-Yeon, DDS, MSD, PhD, Kim, Hyeon-Cheol, DDS, MSD, PhD, Moon, Young-Mi, DDS, MSD, PhD, Fang, Denny Y., DDS, Lee, WooCheol, DDS, MS, PhD
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 2015
• Subjects: Cone fitness; Dental Pulp Cavity - anatomy & histology; Dental Pulp Cavity - diagnostic imaging; Dental Pulp Cavity - drug effects; Dentistry; Endocrinology & Metabolism; Gutta-Percha - chemistry; gutta-percha occupying area; Humans; Nickel; reciprocating file; Root Canal Filling Materials - chemistry; Root Canal Obturation - methods; Root Canal Preparation - instrumentation; Root Canal Preparation - methods; Sensation; Stainless Steel; Titanium; tug-back sensation; X-Ray Microtomography; Cone fitness; tug-back sensation; reciprocating file; gutta-percha occupying area
• ISSN: 0099-2399; 1878-3554
• DOI: 10.1016/j.joen.2014.09.016

Abstract Introduction The purpose of this study was to evaluate the gutta-percha–occupied area (GPOA) and the relationship between GPOA and tug-back sensations in canals instrumented with reciprocating files. Methods Twenty curved canals were instrumented using Reciproc R25 (VDW, Munich, Germany) (group R) and WaveOne Primary (Dentsply Maillefer, Ballaigues, Switzerland) (group W), respectively ( n  = 10 each). The presence or absence of a tug-back sensation was decided for both of #25/.08 and #30/.06 cones in every canal. The percentage of GPOA at 1-, 2-, and 3-mm levels from the working length was calculated using micro–computed tomographic imaging. The correlation between the sum of the GPOA and the presence of a tug-back sensation was also investigated. The data were analyzed statistically at P  = .05. Results A tug-back sensation was present in 45% and 100% canals for #25/.08 and #30/.06 cones, respectively, with a significant difference ( P  < .05). At the 2- and 3-mm levels, #30/.06 cones produced significantly higher GPOA in groups R and W ( P  < .05). The sum of the GPOA score was significantly higher in the samples with a strong tug-back sensation ( P  < .05); however, there was no significant difference between the 2 cone types for this correlation ( P  > .05). Conclusions Under the conditions of this study, the tug-back sensation can be a definitive determinant for indicating higher cone fitness in the curved canal regardless of the cone type.