Journal of Dental Research, Vol 65, 1173-1178, Copyright © 1986 by International & American Associations for Dental Research Online Journals
Influence of metal thickness on stress distribution in metal-ceramic crowns
K. J. Anusavice, B. Hojjatie and P. H. Dehoff
The objective of this study was to calculate the stress distribution
induced in anterior metal-ceramic crowns fabricated with either gold-alloy
or nickel-alloy copings of reduced thickness using plane stress analyses.
Two-dimensional finite element models of three crown designs were subjected
to a simulated biting force of 200 N which was distributed over porcelain
near the lingual metal-ceramic junction. Based on plane stress analyses,
the maximum tensile and compressive stresses in porcelain for the three
cases were 29.5 MPa and 123.1 MPa, respectively. The highest tensile
strains in porcelain for veneered Ni-Cr and Au-Pd copings with conventional
dimensions were 0.016% and 0.014%, respectively. The maximum stresses and
strains in porcelain for the crowns with a conventional coping thickness
(0.3 mm) and a reduced coping thickness (0.1 mm) were not significantly
different. All values were below the critical failure values of porcelain.
