Abstract

The purpose of this study was to determine orthodontists' ability to discriminate small differences of simulated apical root resorption (SARR) on extracted teeth, using the output from three cone beam computed tomography (CBCT) machines. Twenty-four unrestored maxillary anterior teeth exhibiting normal morphology, were collected. The teeth were scanned by three CBCT machines: 1) the NewTom 3G (AFP imaging, USA), 2) the iCAT (Imaging Sciences, USA) 3) and the MicroCAT II (Siemens Medical, USA). Using a sandblaster the apical portion of each tooth was reduced in 0.5 mm increments up to a total reduction of 1.5 mm. Each root modification was scanned by each CBCT machine and saved in DICOM format. All DICOM files were rendered with volume rendering software (OsiriX) and saved in a sequence of thirty-six images at 10° increments in QuickTime Virtual Reality (QTVR) format. Three orthodontists assigned as examiners viewed the QTVR files for every tooth in a single-blinded study. The examiners ranked the order of SARR for each tooth from each machine at 0, 0.5, 1.0 and 1.5 mm discrimination levels. Image accuracy obtained from each machine and the examiners' ability to accurately rank the amount of SARR were compared by using a 2-sample binomial test at a significance level of α = .05. The results showed a 9.63% overall percentage of error. There were no statistically significant differences between the examiners' ability to discriminate SARR at 0.5 mm steps within each machine. However, examiner #2 showed a significantly statistical increased ability to discriminate SARR with the NewTom, than the iCAT or the MicroCAT. The results also indicated that there were no statistically significant differences between the examiners ability to discriminate SARR at 0.5 mm steps between each other. However, compared with examiner #3 on the NewTom, examiner #2 was statistically better in correctly identifying the stages of SARR. The pooled data comparing each machine to each other did not show any statistical significant differences. Low error rates in SARR differentiation on extracted teeth at 0.5 mm may indicate that it is feasible to use CBCT in laboratory evaluation of root length changes.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Orthodontics and Dentofacial Orthopedics

School

Graduate Studies

First Advisor

Joseph M. Caruso

Second Advisor

Craig Anderiko

Third Advisor

Jay Kim

Fourth Advisor

Leroy Leggitt

Fifth Advisor

Kitichai Rungcharassaeng

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2007

Date (Title Page)

8-2007

Language

English

Library of Congress/MESH Subject Headings

Root Resorption -- radiography; Cone-Beam Computed Tomography; Dental Scaling

Type

Thesis

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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