A Comparison in Processing of Alginate Orthodontic Impressions by Commercial Labs

<p>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.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Dentistry

Year

1998

Author dc:creator

• Agnetta, Robert

Contributors dc:contributor

• V. Leroy Leggitt
• Joseph M. Caruso
• Carlos Munoz
• Willis Schlenker

• Orthodontics and Orthodontology
• Alginates; Dental Impression Materials

Statement dc: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.

Language dc:language

English

Repository record dc:identifier

https://scholarsrepository.llu.edu/etd/1317

OAI identifier oai:identifier

oai:scholarsrepository.llu.edu:etd-2794