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.
V. Leroy Leggitt
Joseph M. Caruso
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Alginates; Dental Impression Materials
Loma Linda University Libraries
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.
Agnetta, Robert, "A Comparison in Processing of Alginate Orthodontic Impressions by Commercial Labs" (1998). Loma Linda University Electronic Theses, Dissertations & Projects. 1317.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives