J Adv Prosthodont.  2018 Feb;10(1):25-31. 10.4047/jap.2018.10.1.25.

Metal-ceramic bond strength between a feldspathic porcelain and a Co-Cr alloy fabricated with Direct Metal Laser Sintering technique

Affiliations
  • 1Department of Biomaterials, Dental School, National and Kapodistrian University of Athens, Greece. trpapad@dent.uoa.gr
  • 2Department of Dental Technology, Technological Institute of Athens, Greece.

Abstract

PURPOSE
The aim of the present study was to record the metal-ceramic bond strength of a feldspathic dental porcelain and a Co-Cr alloy, using the Direct Metal Laser Sintering technique (DMLS) for the fabrication of metal substrates.
MATERIALS AND METHODS
Ten metal substrates were fabricated with powder of a dental Co-Cr alloy using DMLS technique (test group) in dimensions according to ISO 9693. Another ten substrates were fabricated with a casing dental Co-Cr alloy using classic casting technique (control group) for comparison. Another three substrates were fabricated using each technique to record the Modulus of Elasticity (E) of the used alloys. All substrates were examined to record external and internal porosity. Feldspathic porcelain was applied on the substrates. Specimens were tested using the three-point bending test. The failure mode was determined using optical and scanning electron microscopy. The statistical analysis was performed using t-test.
RESULTS
Substrates prepared using DMLS technique did not show internal porosity as compared to those produced using the casting technique. The E of control and test group was 222 ± 5.13 GPa and 227 ± 3 GPa, respectively. The bond strength was 51.87 ± 7.50 MPa for test group and 54.60 ± 6.20 MPa for control group. No statistically significant differences between the two groups were recorded. The mode of failure was mainly cohesive for all specimens.
CONCLUSION
Specimens produced by the DMLS technique cover the lowest acceptable metal-ceramic bond strength of 25 MPa specified in ISO 9693 and present satisfactory bond strength for clinical use.

Keyword

Direct Metal Laser Sintering (DMLS); Metal-ceramic bond strength; Three-point bending test; Co-Cr dental alloy

MeSH Terms

Alloys*
Dental Porcelain*
Elastic Modulus
Microscopy, Electron, Scanning
Porosity
Alloys
Dental Porcelain
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