ABSTRACT
Objectives: To assess the bond strength of LD ceramics with resin composite material and surface conditioning using Er:YSGG laser and HF acid
Methods: Thirty LD ceramic [Emax, Ivoclar vivadent] discs were prepared using hot pressing technique and treated with hydroflouric acid [Group-1-HF acid] [9%] [n=10] and Er- yttrium, scandium, gallium and garnet laser [Group-2-ER-YSGG laser] [Waterlase iPlus, 10 Hz and power of 0.5 W, pulse duration of 230 micro s] [n=10]. Ten specimens were left untreated to be included as controls [Group-3-Control]. All the specimens were treated with Adper Single Bond adhesive [3MESPE, St. Paul, MN, USA]. Multicore buildups [3mmx3mm] were performed using a rubber mold on the ceramic surfaces and cured using LED light-curing unit for 140 sec. All specimens were tested using shear bond test and failure modes were assessed with a stereomicroscope and scanning electron microscope. Data was analysed using ANOVA and Tukey Kramer multiple comparisons test
Results: The maximum and minimum shear bond strength values were achieved in HF Acid specimens [Group-1] [28.15 +/- 4.72 MPa] and control specimens [13.47 +/- 3.14 MPa] respectively. Specimens treated with HF acid showed significantly higher bond strength in comparison to laser treated and control specimens [p<0.01]. Laser treated specimens had significantly higher bond strength as compared to controls [p<0.01]
Conclusions: Hydrofluoric [HF] acid treatment showed significantly better outcomes than YSGG laser surface treatment