Effect of combinations of surface treatments and bonding agents on the bond strength of repaired composites

Two-Year Interfacial Bond Durability and Nanoleakage of Repaired Silorane-Based Resin Composite

“…Composite repair with silane application is a point of debate in many studies. [20][21][22] Silanes are molecules with two main functional groups: the silanol, which bonds to the silica of the composite filler, and the organofunctional group, which copolymerizes to the methacrylate of the bonding agent. 15,23 The silane also enhances the wetting of the surface for the bonding agent, which is expected to infiltrate more easily through the irregularities created by the surface roughening.…”

“…15,23 The silane also enhances the wetting of the surface for the bonding agent, which is expected to infiltrate more easily through the irregularities created by the surface roughening. Previous researchers, 22,[24][25][26][27] who used silane primer in repairing methacrylate-based resin composite, proved that it had no significant effect in the repair bond strength. On the contrary, some researchers 5,10 confirmed the important role of silane primer when silorane-based resin composite was repaired with methacrylate-based adhesive/ repair composite but not with the silorane-based intermediate adhesive agent/repair composite.…”

Effect of Surface Treatments on Microtensile Bond Strength of Repaired Aged Silorane Resin Composite

“…14 Several methods of surface treatment have been widely used to establish adequate bond strength between aged and new layers of composite, including surface hydrofluoric acid etching, sandblasting with aluminum oxide particles, abrasion with a diamond bur followed by silica coating, and the use of intermediate bonding agents. 2,10,[14][15][16][17] The bonding of new to aged composite mostly depends on micromechanical interaction, but chemical bonding is also to be taken into consideration. [18][19][20] In a clinical situation, there may be no information about the chemical composition of the existing resin composite restorations.…”

Durability of Surface Treatments and Intermediate Agents Used for Repair of a Polished Composite

“…14 Primary bonding to these particles is not likely and probably relies on the micromechanical interlocking produced by roughening with diamond burs [15][16][17] or air abrasion with aluminum oxide. 1,[6][7]9,[18][19] Thus, the effectiveness of surface treatments for recently polished restorations should be a matter of further study.…”

“…In order to guarantee an intimate adaptation of the repair material to polished composite, an intermediate material is required, as the repairing composite does not properly wet the treated resin composite. 8,12,15,17 Hydrophilicity of the intermediate material for bonding may impair durability of the interfacial bond repair, since more hydrophilic adhesives tend to absorb more water over time; 20 however, few attempts have been made to address this issue. 21 Therefore, the current study evaluated the effects of surface treatment and intermediate agent hydrophilicity on the immediate and durability results of the composite repair of recently polished restorations by means of the microtensile bond strength test (µTBS) and silver nitrate uptake (SNU) and the effects of surface treatment on the composite roughness (Ra) and micromorphological features.…”