Özet:

Objectives: Shear bond strength (SBS) of repaired resin-based CAD/CAM blocks with a resin composite is evaluated in this in-vitro study. Materials and Methods: Resin-based CAD/CAM blocks (Hc Block, Shofu; Cerasmart, GC corp.; Lava Ultimate, 3M; Brilliant Crios, Coltene) were used (n=10). Specimens were prepared and aged with thermocycling. Specimens were roughened by using diamond burs and adhesive agent (OptiBond Universal, Kerr) was applied. Resin composite material was placed onto the roughened surface by using silicone molds for the repair procedure. After 24 hours, second thermocycling procedure was applied and loaded in an AGS-X Universal testing machine (Shimadzu; crosshead speed of 1 mm/min) until failure occurred. Leica MZ 75 stereomicroscope (Leica Microsystems; x20 magnification) was used for the determination of failure type. Kruskal Wallis, Kolmogorov-Smirnov and Fisher’s Exact tests was used for statistical analysis (p<0.05). Results: Failure type differences were not statistically significant for the tested groups (p<0.05); however, multiple comparisons for the Cerasmart-Lava Ultimate and Cerasmart-Hc Block groups showed statistically significant differences (p<0.05). The highest SBS was measured for the Hc Block group (12.2±7.6 MPa) whereas the lowest was for the Cerasmart group (5.1±4.8 MPa). Conclusions: Within the limitations of this study, the resin-based CAD/CAM block type affected the repair SBS value and the bond strength obtained in Cerasmart blocks repaired with Harmonize composite was lower than those obtained in the other three CAD/CAM blocks.

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