Abstract
Objective: The objective of this study was to evaluate the combination effect of surface treatments and bonding agents on bond strength of repairs on aged composite resin. Materials and Methods: One hundred twenty microhybrid composite units (Filtek Z250) aged in distilled at 37ºC water for six months were submitted to different surface treatment prior to resin repairs. Ten specimens were randomly divided into 12 groups: non-treated/no bonding agent (negative control), sandblasting /no bonding agent, silane/no bonding agent, non-treated/ etch-and-rinse; non-treated/one-step self-etch; non-treated/ two-step self-etch; sandblasting/etch-and-rinse; sandblasting/one-step self-etch; sandblasting/two-step self-etch; silane coupling agent/etch-and-rinse; silane coupling agent/ one-step self-etch; silane coupling agent/two-step self-etch. Microshear testing was performed to bond strength assessment. Results: Two-way ANOVA and Tukey’s test (?=0.05) demonstrated significant difference between the surface treatments and adhesive systems. Only no treated surface/etch-and-rinse group showed lower bond strength values when compared to other groups. Conclusion: The considered surface treatments were capable to increase the effectiveness of the repair in composite resin when using the adhesive etch-and-rinse.
Highlights
The concept ‘Minimally Invasive Dentistry’ can be defined as maximal preservation of healthy dental structures [1]
Repair on failed composite restorations as an alternative to replacement can be considered as a minimal invasive procedure [3] in an attempt to prolong the lifetime of aged dental composite and to postpone the beginning of “the repeat restoration cycle” [4]
All repair protocols resulted in a statistically significantly higher bond strength compared to the negative control
Summary
The concept ‘Minimally Invasive Dentistry’ can be defined as maximal preservation of healthy dental structures [1]. This concept in restorative dentistry is closely linked to the development of adhesive dental materials [2]. Repairs in composite resin can be considered the treatment of choice for superficial discolorations in existing restorations, small secondary caries or in cases where the complete removal of an extensive restoration could cause damages to healthy dental structure [5]. Despite advancements in dental adhesive procedures, the replacement of resin-based composite restorations is a continuing dilemma in restorative dentistry. The major reason to repair aesthetic restorations is a preservation of dental structure and reduction of potential harmful effects on the pulp [6]
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