Effect of Er,Cr:YSGG Laser, Air Abrasion, and Silane Application on Repaired Shear Bond Strength of Composites

Abstract

Use of Er,Cr:YSGG (erbium, chromium: yttrium-scandium-gallium-garnet) laser does not improve the shear bond strength of the repaired resin; however, air abrasion with 50-lm aluminum oxide particles results in higher shear repair bond strength, and therefore is recommended prior to repair. Application of a silane coupling agent does not improve the shear bond strength of the repaired resin. SUMMARYAged resin composites have a limited number of carbon-carbon double bonds to adhere to a new layer of resin. Study objectives were to 1) evaluate various surface treatments on repaired shear bond strength between aged and new resin composites and 2) to assess the influence of a silane coupling agent after surface treatments.Methods: Eighty disk-shape resin composite specimens were fabricated and thermocycled 5000 times prior to surface treatment. Specimens were randomly assigned to one of the three surface treatment groups (n=20): 1) air abrasion with 50-lm aluminum oxide, 2) tribochemical silica coating (CoJet), or 3) Er,-Cr:YSGG (erbium, chromium: yttriumscandium-gallium-garnet) laser or to a notreatment control group (n=20). Specimens were etched with 35% phosphoric acid, rinsed, and dried. Each group was divided into two subgroups (n=10): A) no silanization and B) with silanization. The adhesive agent was applied and new resin composite was bonded to each conditioned surface. Shear bond strength was evaluated and data analyzed using two-way analysis of variance (ANOVA).Results: Air abrasion with 50-lm aluminum oxide showed significantly higher repair bond strength than the Er,Cr:YSGG laser and control groups. Air abrasion with 50-lm aluminum oxide was not significantly different from tribochemical silica coating. Tribochemical silica coating had significantly higher repair bond strength than Er,Cr:YSGG laser and the control. Er,Cr:YSGG laser and the control did not have significantly different repair bond strengths. Silanization had no influence on repair bond strength for any of the surface treatment methods.Conclusion: Air abrasion with 50-lm aluminum oxide and tribochemical silica followed by the application of bonding agent provided the highest repair shear bond strength values, suggesting that they might be adequate methods to improve the quality of repairs of resin composites.

Comparative approach to analyse the effects of different surface treatments on CAD/CAM resin nanoceramics–resin composite repair bond strength

“…An increase in the repair bond strength after the application of the diamond bur and cojet might be due to an increase in the surface roughness of the specimens and an increase in the bonded surface area, which was confirmed by SEM micrographs. Surface roughening has been reported to increase the surface energy and adhesive wettability [35,36]. Depending on these findings, grinding with a dimond bur, which is a quick and easy way of roughening, can be recommended as a pretreatment method for repair of CAD/CAM RNC.…”

“…Surface treatment on the fractured surface of composite resin materials must be performed to obtain high bond strength between the materials. Although there is a great deal of information about the effect of several treatment methods on the bonding strength of composite restorations [18,20,27,[31][32][33][34][35][36][37][38][39][40][41][42], very limited data are available on the use of surface treatment of CAD/CAM resin-based materials [26,37,[43][44][45][46] to enhance their repair bond strength.…”

Effects of Er:YAG Laser Pretreatment with Different Energy Levels on Bond Strength of Repairing Composite Materials

“…Another study examined the reasons for this increased repair bond strength and the effects of laser irradiation on composite resins, and found that a change in the volume of the molten material produced strong expansion forces, which produced projections on the surface of the composite resin structure, and that droplets formed with the removal of molten material. 32 SEM showed that Er:YAG laser irradiation of a composite resin caused irregular pitting of the surface, which increased the surface area and resulted in a better stress distribution at the bonding area. 32 These studies concluded that when the output power decreased, greater adhesion was obtained.…”

Effect of ageing on the micro-tensile bond strength of resin based composite when bonded with resin luting cement

“…Furthermore, many studies have investigated different surface conditioning methods (acid etching, surface roughening, silane applications) to improve the bond strength of aged RBCs. [26][27][28] It would be interesting to investigate the impact of surface treatments of aged RBC restorations and its effect on its l-tbs with RLC's.…”