Abstract

Many orthodontists use commercial orthodontic laboratories for the processing of their impressions including preparation of the impression for pouring, model retrieval, final trim, and labeling. It was studied, by way of random sample survey, what materials and methods were most commonly utilized in 100 offices of members of the American Association of Orthodontics. This survey data was analyzed and used to establish a protocol to study differences in dimensions of models made from impressions that were poured immediately, versus those that were stored and picked up at the office the same day they were taken, and those that were shipped via mail for processing at a different location. Additionally it studied how closely the processed initial (T-1) models conformed to the ABO published specifications. The data indicates that there are statistically significant differences depending on the way the models were processed but that these differences were of a size (~0.14nim) that under most circumstances would not be clinically significant for diagnosis and treatment planning of most orthodontic cases. None of the models were noticeably distorted. The data also suggest that the majority of the T-1 models were statistically significantly different than the published ABO guidelines. Under the conditions studied it appeared that each way of processing could yield acceptable models for diagnosis and treatment planning.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

V. Leroy Leggitt

Second Advisor

Joseph M. Caruso

Third Advisor

Carlos Munoz

Fourth Advisor

Willis Schlenker

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1998

Date (Title Page)

9-1998

Language

English

Library of Congress/MESH Subject Headings

Alginates; Dental Impression Materials

Type

Thesis

Page Count

vi; 24

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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