Occlusal convergence and strain distribution on the axial surface of cemented gold crowns

S. Asbia, R. Ibbetson, R. L. Reuben

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


The overall thrust of this work is concerned with the performance of the adhesives used to simulate cementation of gold crowns onto nickel chromium dies under static and dynamic compression. A measurement system, based on the mounting of strain gauges on the outer surface of the crowns, has been developed allowing an indirect semi-quantitative estimate of the state of adhesion.

This paper reports an investigation of the effect of increased total occlusal convergence (TOC) of the nickel chromium dies from 12 degrees to 24 degrees with different degrees of cementation, a) un-cemented, b) partially cemented and c) fully cemented.

Four nickel chromium dies (12 degrees TOC) and five nickel chromium dies (24 degrees TOC) for each convergence were fabricated using the lost wax technique. The axial height of all dies was 6mm. Two miniature gauges were installed on opposing axial surfaces of each gold crown 1 mm above the crown margin. Axial loading and unloading of the crowns was repeated five times for each crown and the values for strain recorded.

The results showed an increase in strain at the axial surfaces with increasing TOC, providing useful design information for the durability of restorative crowns. These findings, along with the findings of earlier work are consistent with a simple model of load transfer between the crown and the die.

Original languageEnglish
Title of host publicationMedicine Meets Engineering
Subtitle of host publicationProceedings of the 2nd Conference on Applied Biomechanics Regensburg
EditorsJoachim Hammer, Michael Nerlich, Sebastian Dendorfer
PublisherIOS Press
Number of pages12
ISBN (Electronic)978-1-60750-304-0
ISBN (Print)978-1-58603-828-1
Publication statusPublished - 2008
Event2nd Conference on Applied Biomechanics - Regensburg, Germany
Duration: 13 Jun 200715 Jun 2007

Publication series

NameStudies in Health Technology and Informatics
ISSN (Print)0926-9630
ISSN (Electronic)1879-8365


Conference2nd Conference on Applied Biomechanics


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