Effect of Surface Treatments on Bond Strength of Ceramic İnlays

The aim of this study was to evaluate the influence of different surface  treatments on microtensile bond strength of ceramic inlays.

Method:

Ninety six non-carious human molar teeth were used in this study. Standardized class I preparations were made in all teeth. Teeth were randomly assigned to 4 groups of 24 each ceramic systems (Finesse, IPS Empress Esthetics, IPS Empress e-Max, Zirkonzahn prettau). Then each group were further divided into 8 groups. 1) Control, 2) 50µm Al₂O₃, 3) etched with % 9 HF, 4) experimental hot etching 30 min, 5) Nd: YAG laser irradiation, 6) Nd:YAG laser+50µm Al₂O₃particle, 7) Nd:YAG laser+% 9 HF, 8) Nd:YAG laser+ experimental hot etching. Cementation procedures followed a standard protocol. After cementation procedures, specimens were stored in distilled water at 37°C for 24 hours. The teeth were sectioned both mesial-distally and buccal-lingually along their long axis into three 1.2X1.2 mm wide I-shaped sections. The specimens were then subjected to microtensile testing at a crosshead speed of 1 mm/min, and the maximum load at fracture was recorded. Two-way analysis of variance and Tukey multiple comparisons tests were used to evaluate the results (p<.05). Fractured surfaces were examined with a stereomicroscope (X20) and classified as adhesive, mixed, or cohesive.

Result:

Airborne particle abrasion with 50µm Al₂O₃demonstrated higher bond strength for all ceramic groups. Etched with %9 HF acid showed higher bond strength for Finesse, IPS Empress Esthetics, IPS Empress e-Max. Experimental hot etching showed higher bond strength for Finesse. Nd: YAG laser irradiation demonstrated no significant difference between control groups.

Conclusion:

Within the limitation of this in vitro study, it can be asssumed that 50µm Al₂O_3, %9 HF acid demonstrated higher bond strength in all ceramic groups.