Abstract
Statement of problem
A high metal-ceramic bond strength is important for successful dental restorations.
However, studies on the evaluation of the bond strength of porous metal–ceramic restorations
compared with conventional ones are scarce.
Purpose
The purpose of this in vitro study was to compare the bond strength of a porous metal–ceramic
structure with conventional metal-ceramic restorations.
Material and methods
Ten porous specimens were fabricated by selective laser sintering (SLS) according
to the International Organization for Standardization 9693-1:2012, 10 specimens without
porosity by SLS, and 10 cobalt-chromium (Co-Cr) cast specimens without porosity. The
ceramic was applied with the pressing method. A 3-point bend test was performed with
a universal testing machine, and the data were statistically analyzed by using 1-way
analysis of variance (α=.05).
Results
The mean ±standard deviation bond strength of the porous group fabricated by SLS was
the lowest (35.6 ±9.1 MPa), that of the group without porosity in the casting method
was 43.5 ±7.8 MPa, and that of the group without porosity fabricated by SLS was the
highest (47.7 ±4.5 MPa); these were statistically similar (P=.058).
Conclusions
Although the porous structure reported the lowest bond strength among the 3 sets of
test specimens, its bond strength was higher than the International Standards Organization
standard of 25 MPa.
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Article info
Publication history
Published online: September 05, 2020
Footnotes
Supported by the Basic Science Research Program through the National Research Foundation (NRF) of Korea, funded by the Ministry of Education (Grant No. 2017R1D1A1B03035688), the Technology development Program (C0511440) funded by the Ministry of SMEs and Startups (MSS, Korea), and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2018R1A5A7023490).
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
