Date of Award

2016

Document Type

Thesis

Degree Name

Master of Science in Dentistry

Department

Oral Rehabilitation

College

College of Dental Medicine

First Advisor

Timothy Rohde

Second Advisor

Joseph E. Assad

Third Advisor

Robert P. Bethea

Abstract

Introduction: The aim of this in vitro study was to compare the incidence of unacceptable fill lengths in canals of various sizes that were prepared with the WaveOne (WO) files (small: 21/.06; medium: 25/.08; large: 40/.08) and obturated with the corresponding thermoplastic carrier-based obturators. Methods: Extracted, mature, patent, human incisors with a single, straight canal (<20°) were instrumented according to manufacturer’s instructions until there were 20 samples per file size. The groups included: Group S: WO size “small”, Group M: WO size “medium”, Group L: WO size “large” (n=20 with 80% power). Samples were then obturated with corresponding WO thermoplasticized carrier-based obturators per manufacturer’s instructions. Extension of gutta-percha was assessed radiographically and clinically under a dental operating microscope by two calibrated examiners. Results were statistically analyzed using the Fisher’s exact test and a significance value of P =.05. Results: Radiographically, the incidence of overextension was 35%, 30%, and 60% for Groups S, M, and L, respectively. The incidence of acceptable fill lengths was 65%, 70%, and 40% for Groups S, M, and L, respectively. Clinically, the incidence of overextension was 50%, 60%, and 55% for Groups S, M, and L, respectively. The incidence of acceptable fill length was 50%, 40%, and 45% for Groups S, M, and L, respectively. No sample was considered underextended, regardless of the method of assessment. There was no statistically significant difference in the incidence of overextension for the various canal sizes, based on both radiographic and clinical assessment. Radiographic assessment tended to underestimate the incidence of overextension as compared to clinical assessment. Conclusions: Canal size did not have a significant effect on the incidence of overextension when using the WaveOne file system and thermoplasticized carrier-based obturators.

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