Date of Award

1-1-2014

Embargo Period

1-1-2025

Document Type

Thesis

Degree Name

Master of Science in Dentistry

Department

Oral Rehabilitation

Additional Department

Endodontics

College

College of Dental Medicine

First Advisor

Marc E. Levitan

Second Advisor

Joseph E. Assad

Third Advisor

Robert P. Bethea

Abstract

Introduction: A common critique of using thermoplasticized obturators is the incidence of overextension. It would be of benefit to clinicians to have a technique for canal preparation that would allow for predictable length control. This study compared straight canals instrumented to a size 40 file using a 0.04 standardized taper preparation (STP) with a varied taper preparation (VTP) by evaluating the extension of GuttaCore® (GC) obturators (Dentsply Tulsa Dental, Tulsa, OK). Methods: Eighty extracted mature human premolars with single straight canals were randomly divided into 2 experimental groups (n = 40). Group 1 was instrumented to size 40/.04 at working length (WL) with STP. Group 2 was instrumented to size 40/.02 at WL with VTP. Both groups were obturated with a size 40 GC obturator per manufacturer's instructions. Extension of material in relation to WL was evaluated and assessed ordinally. Statistically significant differences were determined by a two-group chi-square test with a two-sided p-value set at P = .05 and with a Fisher's exact test of equal proportions. Results: Significant differences in extrusion existed between groups 1 and 2 when controlling for type of apical preparation (P = .0005). Group 1 (VTP) resulted in 47.2% incidence of overextension whereas group 2 (STP) resulted in 10.5% overextension of obturating material. Conclusion: The results indicate that when filling straight canals with GC obturators the canal can be instrumented using a varied tapered canal preparation with a low likelihood of overextension.

Rights

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