Abstract
Statement of problem
A recently introduced presintered cobalt-chromium (Co-Cr) alloy for metal ceramic
restorations can be efficiently processed with computer-aided design/computer-aided
manufacturing (CAD/CAM) techniques. However, little or no reliable study data are
available regarding the bonding ability of porcelain to milled Co-Cr alloys.
Purpose
The purpose of this study was to evaluate the shear bond strength of veneering porcelain
to the presintered Co-Cr alloy and to a conventional castable alloy.
Material and methods
Ninety-six cylindrical cores (6.8 mm in diameter, 9 mm in height) were made of millable
alloy (Ceramill Sintron) and castable alloy (4-all) by means of CAD/CAM or casting,
48 cores for each alloy. Four types of veneering porcelain were fired or pressed to
the cores; these specimens had dimensions of 4×4×3 mm. After firing, the specimens
were put in resin molds, fixed in a universal testing machine, and subjected to a
shear force test. Loading was applied to each specimen through the attached crosshead
at a constant drive speed of 0.5 mm/min until fracture occurred. Shear bond strengths
(MPa) were calculated by dividing the maximum failure force over the cross-sectional
area of each specimen. Failure patterns of the specimens were also investigated and
characterized as adhesive, cohesive, or mixed. One-way ANOVA and the Duncan post hoc
test were used to analyze statistically significant differences between groups (α=.05).
Results
The means of the shear bond strengths of (millable) Ceramill Sintron were similar
to or higher than those of (castable) 4-all cores. The shear bond strength was significantly
lower for Press-To-Metal veneer than for the other fired veneers in the test (P<.001). The pattern of failure in most specimens was mixed, except for Press-To-Metal
veneer, where cohesive failure occurred.
Conclusions
The bonding ability of the traditional castable alloy was similar to that of the presintered
millable Co-Cr alloy.
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Article info
Publication history
Published online: February 10, 2015
Identification
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© 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
