Effect of Surface Treatment and Cleaning on Bond Strength to Hybrid Ceramic

Objectives: This In Vitro study measured and compared the micro shear bond strength of a resin cement to a hybrid ceramic with two different surface treatments and cleaning methods.
Methods: 35 Vita Enamic specimens were treated with either hydrofluoric acid 5% (20s, 60s,120s), phosphoric acid 38% (60s), ultrasonic bath (5min) and bonded with silane and resin cement (Bifix QM,VOCO). Specimens were stored at 100% humidity and 37⁰C for 24 hours. Microshear bond strength was tested.
Results: Bond strength values ranged from 9.86 (control) to 20.27 MPa (HF 60s + Phosphoric acid 60s + ultrasonic cleaning (5min distilled water). There was no statistical significance between groups. Detailed values are listed in the table.
Conclusions: Surface treatment did not influence bond strength to hybrid ceramic. However, Hydrofluoric acid etching (60 sec) followed by surface cleaning with phosphoric acid (60s) and ultrasonic bath (5min) provided the highest shear bond strength values.