Abstract
Statement of problem
Most studies evaluating dental laser sintering systems have focused on the marginal
accuracy of the restorations. However, the bond strength at the metal-ceramic interface
is another important factor that affects the survival of restorations, and currently,
few studies focus on this aspect.
Purpose
The purpose of this in vitro study was to compare the porcelain bond strength of cobalt-chromium
(Co-Cr) metal frameworks prepared by using the conventional lost-wax technique, milling,
direct metal laser sintering (DMLS), and laser cusing, a direct process powder-bed
system.
Material and methods
A total of 96 metal frameworks (n=24 in each group) were prepared by using conventional
lost-wax (group C), milling (group M), DMLS (group LS), and direct process powder-bed
(group LC) methods according to International Organization for Standardization standard
ISO 9693-1. After porcelain application, a 3-point bend test was applied to each specimen
by using a universal testing machine. Data were statistically analyzed using 1-way
ANOVA and Tukey honest significant difference tests (α=.05). Failure types at the
metal-ceramic interfaces were examined using stereomicroscopy. Additionally, 1 specimen
from each group was prepared for scanning electron microscopy analysis to evaluate
the surface topography of metal frameworks.
Results
The mean bond strength was 38.08 ±3.82 MPa for group C, 39.29 ±3.51 MPa for group
M, 40.73 ±3.58 MPa for group LS, and 41.24 ±3.75 MPa for group LC. Statistically significant
differences were observed among the 4 groups (P=.016). All groups, except for LS, exhibited adhesive and mixed type bond failure.
Conclusions
Both of the laser sintering methods were found to be successful in terms of metal-ceramic
bond strength.
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Article info
Publication history
Published online: March 23, 2017
Identification
Copyright
© 2016 by the Editorial Council for The Journal of Prosthetic Dentistry.
