Evaluation the Effect of Trichloroethylene on the Metal-Ceramic Bonding

The aim of the study is to evaluate the effect of trichloroethylene (TCE) on the metal-ceramic bond of ‎additively manufactured and casting Co-Cr alloys. For this purpose, 84 disc-shaped (r=12 mm, h=1 mm) ‎specimens were prepared for two experimental groups (n=42) with different fabrication techniques; casting ‎and additively manufactured with Co-Cr. Before ceramic application, the disc specimens divided into two ‎subgroups (n=21): Casting and cleaned with TCE (CT), casting and not cleaned with TCE (C), additively ‎manufactured and cleaned with TCE (AT), additively manufactured and not cleaned with TCE (A). Ceramic ‎‎(h=4 mm, r=6 mm) was applied to the disc specimens (n=20) and their shear bond strength (SBS) was ‎measured. The surface morphology of disc (n=1; for each subgroup) specimens before and after TCE ‎application was analyzed with a scanning electron microscope (SEM). Results were statistically analyzed with ‎‎1-way ANOVA and the Bonferroni multiple comparisons tests (α=0.05). Significant differences were found in ‎SBS of the CT, C, AT, and A groups. CT group (21.74±1.66 MPa) showed a significantly higher SBS value ‎than the C (18.65±2.11 MPa), AT (19.07±1.75 MPa) and A (18.52±1.94 MPa) groups (p<0.001). In ‎conclusion the application of the TCE increased the metal-ceramic bond of casting Co-Cr alloy. Although the ‎results were not statistically significant the TCE also increased the bond of additively manufactured Co-Cr ‎alloy.