Objective. This study compared tooth length measurements made on cone beam computed tomography (CBCT) scans and 3-Tesla (3T) magnetic resonance (MR) scans performed with and without an alginate bite registration surrounding the crowns of the teeth. Materials and Methods. One CBCT scan, one MR scan with alginate bite registration, and one MR scan without bite registration were performed on 12 subjects. The alginate bite registration was used to provide a proton-rich material to surround proton-poor teeth in an attempt to improve visualization of teeth. DICOM formatted images from each of the three scans for each subject were oriented in all three planes of space. Slices of 4 mm thickness were made through all permanent teeth. Tooth length measurements were made from the slices. Results. The presence of alginate bite registration during MR scans made it impossible to determine tooth lengths on MR images. Tooth lengths measured from CBCT and MR scans without alginate bite registration were very highly correlated. For 336 measurements (N = 336) the correlation coefficient was found to be 0.953 (p < 0.001). Conclusions. 1.) Alginate is not a useful material in increasing visualization of teeth on MR scans. 2.) Tooth length measurements made on MR scans are highly correlated with tooth length measurements made on CBCT scans.

LLU Discipline

Orthodontics and Dentofacial Orthopedics


Orthodontics and Dentofacial Orthopedics


School of Dentistry

First Advisor

Leggitt, V. Leroy

Second Advisor

Farrage, James

Third Advisor

Rynearson, R. David

Degree Name

Master of Science (MS)

Degree Level


Year Degree Awarded


Date (Title Page)




Library of Congress/MESH Subject Headings

Tooth - Radiography; Cone-Beam Computed Tomography; Magnetic Resonance Imaging; Imaging - three dimensional;

Subject - Local

Alganite bite registration; Tooth length measurements; Dental Materials



Page Count


Digital Format


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.


Loma Linda University Electronic Theses and Dissertations

Collection Website



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