DOI

10.17077/etd.18xp6r8n

Document Type

Thesis

Date of Degree

Spring 2017

Degree Name

MS (Master of Science)

Degree In

Oral Science

First Advisor

Peters, Ove A.

Second Advisor

Teixeira, Fabricio B.

First Committee Member

Williamson, Anne E.

Second Committee Member

Johnson, William T.

Abstract

The TRUShape 3D Conforming File (TRUShape), a novel, S-shaped nickel-titanium (NiTi) rotary file, was developed to facilitate cleaning and shaping of irregular-shaped root canals. The purpose of this study was to evaluate the shaping ability of TRUShape compared to Vortex Blue (VB) when used in non-round, oval-shaped root canals by micro-computed tomography (MCT).

Thirty single-rooted human mandibular premolar teeth with radiographically similar root canal size and curvature were randomly allocated to two groups (N=15), and mechanically prepared with TRUShape or VB. Each tooth was submitted to MCT at 20 μm resolution at three time intervals: before shaping, and after shaping to an intermediate apical size 30 and a final apical size 40. Three-dimensional data sets were superimposed and evaluated for root canal volume, surface area, and treated surface. Matched axial slices in the apical, middle, and coronal root thirds were evaluated for area, roundness, and canal transportation expressed as center of mass shift (CMS). Data were statistically analyzed using parametric and non-parametric tests.

Root canal volumes increased similarly and significantly overall (p< 0.001; from an initial volume of 7.3±3.5 mm3 to an intermediate volume of 8.7±3.1 mm3 and a final volume of 9.9±3.0 mm3). Treated canal surface was significantly larger in the TRUShape group at both apical sizes 30 and 40 with 72±15% vs. 55±23% and 85±12% vs. 71±20% non-static voxels for TRUShape and VB, respectively (p< 0.05). Canal transportation was less than 100 μm in all but 8 out of 90 cross sections and was not significantly different between groups.

This MCT study demonstrated the TRUShape 3D Conforming File to be effective in the mechanical preparation, specifically, the surface treatment, of single-rooted premolars with non-round, oval-shaped root canals.

Funding was provided by the American Association of Endodontists (AAE) Foundation and the Department of Endodontics at the University of Iowa, College of Dentistry.

Public Abstract

Endodontic treatment aims to prevent or eliminate apical periodontitis, an inflammatory disease caused by an infected root canal system. Central to endodontic treatment is chemo- mechanical root canal preparation: mechanical enlargement and shaping combined with chemical disinfection of the root canal system. An ever-changing armamentarium is used to perform and evaluate chemo-mechanical root canal preparation, “preparation” for short. The TRUShape 3D Conforming File is a novel instrument, whose unique design, an S-curve in the instrument’s long axis, may enhance preparation of non-round root canals. The purpose of this study was to evaluate the preparation ability of TRUShape compared to Vortex Blue (VB), an established endodontic instrument, when used in non-round root canals by three-dimensional (3D) analysis, namely micro-computed tomography (MCT)./

Thirty extracted, single-rooted human teeth with similar root canal size and curvature were assigned to two groups (N=15): TRUShape or VB. Root canals were prepared according to manufacturer’s instructions. Each specimen was scanned using a desktop MCT unit at three time intervals: pre-, mid-, and post-preparation. Two- and three-dimensional data sets were generated. Root canal volume and prepared or “treated” surface, and each instrument’s ability to remain centered in the root canal during preparation were statistically analyzed.

Root canal volumes increased similarly and significantly overall in the TRUShape and VB groups. Treated root canal surface was significantly larger in the TRUShape group. There was minimal difference in files’ centering ability.

This MCT study demonstrated the TRUShape 3D Conforming File to be effective in mechanical root canal preparation of single-rooted teeth with oval-shaped root canals.

Keywords

cleaning and shaping, mandibular premolars, mechanical preparation, micro-computed tomography, oval-shaped root canals, TRUShape

Pages

xii, 58 pages

Bibliography

Includes bibliographical references (pages 55-58).

Copyright

Copyright © 2017 Lauren Elizabeth Jensen

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