Abstract

Although the indirect method for preparing dental castings has been in use for over forty-five years, very little information has appeared in dental literature relative to its accuracy. The development of a precise and quantitative method for determining the adaptation of wax patterns or castings was necessary before such an evaluation could be considered valid. It was felt the Mercury Micromeasurement test, devised in 1958 by Hollenback, should meet these requirements. A description of the test had been published. However, at the time the project was begun, no data had appeared in the literature.

In order to establish a standard for accuracy of wax pattern adaptation, a total of fifty-six wax patterns were formed for a master die using three different waxing technics. The tooth used as a master die was a one and one-half dimension, ivorine, maxillary first molar with a typical M.O.D. preparation cut in it. After mercury micromeasurement the wax patterns were readapted by use of two types of swagers and reevaluated.

A three-surface preparation similar to the one in the master die was cut in a clear plastic tooth in order to visually ascertain the approximate distribution of mercury left under seated wax patterns and castings.

The accuracy of the indirect method was determined by comparison of the adaptation of given wax patterns in. The following is a brief summary of the more significant findings of this study:

  1. No clinically significant difference was found in the adaptation of wax patterns formed by three commonly used technics.
  2. The volume of the space between a die and a well adapted wax pattern should be less than two cubic millimeters before swaging and less than one cubic millimeter after swaging, when the technics used in this study are followed. Measurements on normal sized teeth, it will be recognized, should be less than two-thirds of the amounts found in these measurements.
  3. Roughness of cavity walls adversely effects the adaptation of wax patterns.
  4. The accuracy of the indirect method for preparing dental castings was found to be very good under controlled conditions.

Department

Dentistry

School

Graduate Studies

First Advisor

George M. Hollenback

Second Advisor

Melvin R. Lund

Third Advisor

Robert W. Woods

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1961

Date (Title Page)

6-1961

Language

English

Library of Congress/MESH Subject Headings

Dental Casting Technique

Type

Thesis

Page Count

vi; 27

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

Download

Share

COinS