Accession Number:

AD0270182

Title:

A STUDY OF FACTORS AFFECTING THE SETTING EXPANSION OF DENTAL GYPSUM MATERIALS

Descriptive Note:

Corporate Author:

OREGON UNIV PORTLAND DENTAL SCHOOL

Personal Author(s):

Report Date:

1962-01-31

Pagination or Media Count:

1.0

Abstract:

The purpose of this project is to determine the factors which affect the setting expansion of dental gypsum material. This progress report covers the work done on one phase of this project namely the investigation of the influence of manipulative and environmental factors on the effective setting expansion of gypsum-base casting investments under conditions of practical usage. The results indicate that the effective setting expansion is significantly influenced by the nature of the asbestos-lined ring and the wax pattern shape and only slightly influenced by manipulative factors such as degree of spatulation and waterpowder ratio. In addition, the prediction of effective setting expansion cannot be made on the basis of linear trough measurements. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE