Effect of Surface Pretreatments on the Microtensile Bond Strength of Lithium-Disilicate Ceramic Repaired with Composite Resin

Abstract

The aim of this study was to evaluate the influence of ceramic surface treatments and silane drying temperature on the microtensile bond strength (μTBS) of a resin composite to a lithium disilicate ceramic. Twenty blocks (7x7x5 mm) of lithium disilicate-based hotpressed ceramic were fabricated and randomly divided into 4 groups: G1: acid etching with 9.5% hydrofluoric acid for 20 s and drying silane with room-temperature air; G2: acid etching with 9.5% hydrofluoric acid for 20 s and drying silane with 45 ± 5 °C warm air; G3: airborne-particle abrasion with 50 μm aluminum oxide particles and drying silane with 45 ± 5 °C warm air; G4: airborne-particle abrasion with 50 μm aluminum oxide particles and drying silane with air at room-temperature. After treatments, an adhesive system (Single Bond 2) was applied, light-cured and direct restorations were built up with a resin composite (Filtek Z250). Each specimen was stored in distilled water at 37 °C for 24 h and cut into ceramic-composite beams with 1 mm 2 of cross-sectional area for μTBS testing. Statistical analysis was performed with one-way ANOVA and StudentNewman-Keuls test (α=0.05). μTBS means (S.D.) in MPa were: G1: 32.14 (7.98), G2: 35.00 (7.77) and G3: 18.36 (6.17). All specimens of G4 failed during the cutting. G1 and G2 presented significantly higher μTBS than G3 (p<0.05). There was no statistically significant difference between G1 and G2 (p>0.05). As far as the bond strength is concerned, surface pretreatment of lithium-disilicate ceramic with hydrofluoric acid and silane application can be used as an alternative to repair ceramic restorations with composite resin, while surface pretreatment with sandblasting should be avoided.

Surface treatments for repair of feldspathic, leucite- and lithium disilicate-reinforced glass ceramics using composite resin

“…Additionally, it was observed that the success of surface treatment depends on the ceramic type. For the lithium disilicate-reinforced glass ceramic, the etching with hydrofluoric acid promoted the highest µTBS values, which is in agreement with Colares et al (10). This ceramic has the lowest vitreous proportion among the ceramics tested in this study.…”

“…Bonding components are also required for the adhesion to restorative material. Traditionally, surface treatment for ceramics involves roughening with diamond burs (7)(8)(9), etching with hydrofluoric acid (8,(10)(11)(12) or tribochemical process based on silica-coated aluminumoxide particles (11)(12)(13)(14)(15)(16)(17). For restorative material bonding, use of silane is recommended for glasses and porcelains in order to obtain a mesh of siloxane with the silica on the ceramic surface, to improve the bond strength between the ceramic and luting material and to increase the surface energy for adhesive application (18).…”

Effect of surface treatments on shear bond strength of resin composite bonded to CAD/CAM resin-ceramic hybrid materials

“…Bonding components are also required for the adhesion to a restorative material 18. Roughening with diamond burs,19 etching with hydrofluoric acid,2021 and sandblasting21 are the surface treatments recommended for ceramics. Silane is also used for ceramics in order to strengthen the bond between the ceramic and cement.…”

“…It can increase the surface energy for adhesive application 22. Although the intraoral repair process for ceramic restorations has been widely investigated in the literature,182123242526 limited information is available on the surface treatments and intraoral repair protocol for CAD/CAM resin-ceramic hybrid materials 1327. The aim of this in-vitro study is to evaluate the effect of surface treatments on SBS of resin composite bonded to thermocycled and non-thermocycled CAD/CAM resin-ceramic hybrid materials and to determine the effect of surface treatments on the surface roughness of these hybrid ceramics.…”

The effect of heat treatments applied to superstructure porcelain on the mechanical properties and microstructure of lithium disilicate glass ceramics

“…Surface treatments such as sandblasting and acid etching alter the surface topography by creating micro-and nano-scale porosities of varying depth and width 32) . The resultantaltered surface topography increases the surface area for micromechanical bonding with resin cements [33][34][35] . In the majority of the studies carried out, the effect of different numbers of firing and pressing on the color, surface roughness, hardness and microstructure of LDCs has been examined.…”