Abstract
Statement of problem
The popularity of direct metal laser sintering (DMLS) and melting (DMLM) has increased
in dental practice. The layered manufacturing device, the alloy powder, and the layer
thickness may affect the mechanical properties of layer-fabricated metals.
Purpose
The purpose of this in vitro study was to evaluate the mechanical, fractographic,
and compositional properties of metals fabricated by using different layered manufacturing
techniques (DMLS and DMLM), cobalt-chromium (Co-Cr) alloy powders, and layer thicknesses.
Material and methods
A total of 90 dumbbell-shaped test specimens (n=15/group) were fabricated by using
either DMLS or DMLM. Powder alloys used were EOS Co-Cr SP-2 and Keramit NP-S, each
with layer thicknesses of 20 and 30 μm; their mechanical properties were evaluated
by using a test for tensile strength. Three-way ANOVA, Student t test, and 1-way analysis of variance, followed by the Tukey honest significant differences
test were used for statistical analysis (α=.05). The fracture surface was analyzed
by using scanning electron microscopy, and energy dispersive spectroscopy was used
for compositional evaluation.
Results
Different layered manufacturing equipment affected the mechanical properties of the
final objects, but the powder and layer thickness did not affect mechanical properties.
Conclusions
The powder and layer thickness did not affect mechanical properties of the layered
manufactured alloy, but different manufacturing methods did affect the mechanical
properties of the final product.
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Article info
Publication history
Published online: June 28, 2018
Footnotes
Supported by Scientific Research Projects Coordination Unit of Cukurova University project TSA-2016-5518.
Identification
Copyright
© 2018 by the Editorial Council for The Journal of Prosthetic Dentistry.
