Abstract

Introduction: Cone-beam computed tomography (CBCT) scans may be used to measure mesial-distal (MD) tooth width for orthodontic diagnosis and treatment planning. Purpose: The objective of this study was to determine if MD tooth measurements from unsegemented CBCT scans in the axial, sagittal, and coronal planes or from a panoramic reconstruction correlate and agree with respective measurements made on study models. Material and Methods: Using stone models of 30 subjects, reference MD tooth measurements were made using digital calipers. From CBCT scans, five different methods of measuring MD width were used and compared to the reference: (1) points chosen from orthogonal planar views using a custom plugin for OsiriX, (2) points chosen from a simple panoramic image made in OsiriX and (3) Dolphin, and finally, (4) points from a detailed panoramic image made in OsiriX and (5) Dolphin. Statistical Analysis: An Intra-class correlation (ICC) was used to compare resulting MD measurements from the five different measurement methods to the model measurements. Ten subjects were re-measured for reliability using Cronbach's Alpha. Box-whisker plots were used to visualize results. Results: At a statistically significant level, measurements made from reconstructed panoramic films and from orthogonal planar views show high correlation and agreement with reference measurements. A detailed panoramic cut line produced more accurate measurements than a simple cut line. Anterior tooth measurements were more variable. Conclusions: MD tooth widths can be accurately measured from CBCT scans. Care must be taken in how panoramic slices are constructed and how the data is measured.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Orthodontics and Dentofacial Orthopedics

School

School of Dentistry

First Advisor

Caruso, Joseph

Second Advisor

Batesole, Mark

Third Advisor

Leggitt, V. Leroy

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

January 2011

Date (Title Page)

9-1-2011

Language

English

Library of Congress/MESH Subject Headings

Cone-beam Computed Tomography; Tooth; Tomography Scanners; Radiography, Dental, Digital

Subject - Local

Mesial-Distal Tooth Measurements; Unsegmented CBCT

Type

Thesis

Page Count

73 p.

Digital Format

Application/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 & Dissertations

Collection Website

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

Repository

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

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