In vitro comparison of new generation adhesive systems in enamel conditioning with ER: YAG laser: SBS and ARI analysis

Abstract

Bond strength which is as high as that of acid etching under in vitro conditions was provided by the laser which can be used more simply with a shorter clinical time than the acid etching. The aim of this study was to compare different orthodontic adhesives with the efficacy of Er: YAG laser for enamel conditioning. The effects of these adhesives’ types (single component orthodontic adhesives and glass carbomer cement) with lasers have not been studied previously. A total of 80 specimens were etched by irradiation of Er: YAG laser with 1.2-W power at 10 Hz and divided randomly into four groups (n = 20): group 1, bonding with Transbond XT primer with Transbond XT composite; group 2, Biofix; group 3, GC ortho connect; group 4; glass carbomer cement. Metal brackets were then bonded with adhesives. Shear bond strength tests were conducted on them in a universal testing machine after 24 h of water storage. A stereomicroscope was used to calculate the adhesive remnant index (ARI). The statistical analysis of the data was done. The mean and standard deviation of shear bond strength were 11.67 ± 3.22, 9.78 ± 3.68, 7.85 ± 1.90, and 5.06 ± 1.72 MPa in groups 1 to 4, respectively. According to the ARI scores, there was a main mixture of the bond failure modes in all groups. The optimal shear bond strength was yielded by Er: YAG lasers with the mentioned parameters, which may be used as another option for acid etching of the bracket bond to composite with single-component adhesive systems.