Abstract
Objectives:To evaluate the effect of silane application and silane heat treatment on lithium-disilicate ceramic when bonded to composite resin.Methods:Twelve blocks of lithium-disilicate (LD) ceramic were fabricated and bonding surfaces were etched using 9.5% hydrofluoric acid (90 seconds). Three experimental groups resulted from the various surface treatment combinations, which included, no silane application (NS) (controls), silane application (S) and silane heat treatment (HS) (100°C for 5 minutesutes). Ceramic and composite resin blocks were bonded using an adhesive resin and light cured restorative composite as a luting agent, under standard conditions. A total of 90 specimen sticks (8 x 1mm²) were subjected to micro-tensile bond strength testing. The means of micro-tensile bond strength (µ-tbs) of the study groups were analyzed using t-test and ANOVA. The tested specimens were analyzed for mode of failure using scanning electron microscopy (SEM).Results:The highest µ-tbs value (42.6 ±3.70 MPa) was achieved for LD ceramics with heat-dried silane. Both silane application and heat treatment of silane resulted in significant (p<0.05) improvements in micro-tensile bond strength of LD ceramics when bonded to resin composite.Conclusions:The application of silane and its heat treatment showed significant improvement in bond strength of lithium disilicate ceramic when bonded to composite.
Highlights
Development of resin-bonded all-ceramic restoration has led to their extensive use as veneers, crowns, inlay and onlays
A glass ceramic based on lithium disilicate (LD) (SiO2– Li2O) crystals has been developed to extend the use of resin-bonded ceramic restorations for bridge construction
The lowest μ-tbs value was obtained for Group A, with no silane application (NS) 34.95(±3.12) Mpa
Summary
Development of resin-bonded all-ceramic restoration has led to their extensive use as veneers, crowns, inlay and onlays. A glass ceramic based on lithium disilicate (LD) (SiO2– Li2O) crystals has been developed to extend the use of resin-bonded ceramic restorations for bridge construction. This pressed glassceramic has an improved flexural strength and fracture toughness as compared to others (leucite reinforced ceramics) and demonstrates abrasion resistance, chemical durability and optical properties well within the dental standards.[1] it has gained support for its use in fabrication of 3-unit bridges for posterior region up to the second premolar.[1,2,3]. It is hypothesized that heat treatment after silane application would improve the bond strength of lithium disilicate ceramics. The present study was aimed to evaluate the influence of silane heat treatment on the microtensile bond strength (μ-tbs) of lithium disilicate ceramics
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