Abstract
Repair in resin-based composite is a procedure that has shown good results, when properly indicated. In cases of fracture or stainning, the total removal of the restoration can cause unnecessary wear on the dental element. This study evaluated the aging effect on the bond strength of a universal adhesive containing silane, and/or application of silane separately for composite repairs. Resin composite blocks were thermocycled and divided according to adhesion protocol (n=10): silane(Sil), conventional adhesive(CA), universal adhesive(UA), Sil+CA(SilCA), and Sil+UA(SilUA). Layers of resin composite were added and blocks were sectioned and divided into 2 subgroups: 24h and 4 months of water storage. Microtensile bond strength test was performed and data were statistically analyzed (a = 0.05). After 4months of aging SilCA and SilUA showed a significant bond strength reduction, while for UA the bonding remained stable.
Highlights
In fractures cases or color changes, complete removal of resin-based restorations may result in additional loss of dental tissue, which it could be avoided by performing a repair, a conservative technique consisting of removing only the unsatisfactory part of the restoration and adding a new resin composite (Imbery et al, 2014). its success depends on proper case selection, material, and technique
After 24 h, the application of only silane coupling agent resulted in significantly lower bond strength (16.6 ± 3.33), indicating the relevance of using adhesive system
Tests performed after 4 months of water storage showed a significant decrease in bond strength values for Sil (13.3 ± 2.12), Sil + CA (SilCA) (29.0 ± 2.49) and Sil + UA (SilUA) (30.8 ± 3.96) groups
Summary
In fractures cases or color changes, complete removal of resin-based restorations may result in additional loss of dental tissue, which it could be avoided by performing a repair, a conservative technique consisting of removing only the unsatisfactory part of the restoration and adding a new resin composite (Imbery et al, 2014). its success depends on proper case selection, material, and technique (da Costa et al, 2021).The use of silane coupling agent in repairs has been reported as important for obtaining improved adhesive interface (de Rosatto, Roscoe, Novais, Menezes & Soares, 2014; Staxrud & Dahl, 2015; Mendes et al, 2020). A recent study suggest that the application of the adhesive with or without the silane improve the bond strength of repairs in resin-based composite (Chen, Chen, Wu & Du, 2021). Silane has been added to provide broader indications, such as adhesion to dental ceramics and repair of resin composites (Elias et al, 2015). Some studies verified that a universal adhesive showed similar bond strength compared to separate use of silane or an adhesive system; the bonding stability was not evaluated (Staxrud & Dahl, 2015; Fornazari, Wille, Meda, Brum & Souza, 2017)
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