Comparative Evaluation Of Shear Bond Strength Of Resin Cement To Lithium Disilicate By Various Surface Treatments - An In-Vitro study
Oral rehabilitation, Prosthodontics, Lithiumdisilicate, Bonding, Sandblasting, Adhesion.
AuthorsAbstractThe popularity of all ceramic restorations has increased in recent years. The placement of ceramic inlays, onlays, veneers and complete crowns have gained more demands. This has lead to greater use of composite resin cement to provide strength for all ceramic restoration and to ensure secure attachment to the tooth. To enhance the bond strength of luting cement to the ceramic, a number of techniques have been reported which mechanically facilitate resin-ceramic bonding. Advances in adhesive dentistry have resulted in the introduction of surface conditioning methods such as airborne abrasion with aluminium oxide, glass beads etc to improve bond strength. Etching the inner surface of a restoration with hydrofluoric acid is also a recommended method to increase bond strength. The clinical success of ceramic restoration is heavily dependent on the luting cement and cementation procedure. The present study evaluates improvement of the bond strength between lithium disilicate and adhesive cements by various surface treatments, which include sand blasting with aluminium oxide, sand blasting with glass beads, and acid etching with hydrofluoric acid. The shear bond strength thus obtained using these variables are compared with one another.
AIMTo evaluate and compare the effect of different surface treatments on the shear bond strength between lithium disilicate ceramic and composite resin cement. MATERIALS AND METHOD 64 Samples of lithium disilicate of size 10×10×2 mm was made. This lithium disilicate block was embedded in an acrylic block. 64 specimens were equally divided into 4 groups. Group A-Without surface treatment, Group BSand blasting with aluminium oxide, Group C- Sand blasting with glass beads, and Group D- Acid etching with Hydrofluoric acid. A mould of polyethylene was made for attaining uniform size and shape of composite resin cement. This mould was placed at approximate centre of the lithium disilicate specimen. The base and catalyst paste of composite resin cement were mixed and placed into this mould. Then the resin cement is light cured for 40 seconds and mould gently removed from the test specimen. Shear bond strength between composite resin cement and lithium disilicate was measured by mounting the sample in a jig of universal testing machine.
RESULTSHAPIRO- WILK TEST was used for testing the normality assumption of quantitative data. One way ANOVA followed by Tukey’s post Hoc test was used for association between variables. Probability value (p<0.05) was considered statistically significant. The mean and standard deviation of the control group was 187.68±1.37. For specimen treated with aluminium oxide the mean and standard deviation turned out to 228.66 ±3.898, where as for those treated with glass bead it was 175.43±5.24. Specimens treated with hydrofluoric acid showed mean and standard deviation 271.01±3.50. The •••••••••••••••••••••••••••••••• ejprd.org - Published by Riset Publication Services LLC
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