Gen Dent. 2025 Sep-Oct;73(5):42-47.
ABSTRACT
The aim of this study was to evaluate the shear bond strength and Adhesive Remnant Index (ARI) of ceramic brackets bonded to enamel using a universal adhesive system free of bisphenol A glycidyl methacrylate (Bis-GMA). A total of 100 bovine incisors were divided into 2 groups (n = 50) that received ceramic brackets (Morelli Ceramic or Ice Clear) bonded after acid etching and application of 1 of 5 adhesive systems (n = 10): Adper Single Bond 2, a conventional adhesive system (control group); Scotchbond Universal Plus, a Bis-GMA-free universal adhesive system; and Single Bond Universal, BeautiBond Xtreme, and BeautiOrtho Bond II, all Bis-GMA-containing universal adhesives. Shear bond strength was tested in a universal testing machine (50-kgf load cell; 0.5 mm/min crosshead speed), and the ARI was analyzed under ×20 magnification. Statistical analysis included a generalized linear model with Fisher exact test, Kruskal-Wallis test with post hoc Dunn test, and Mann-Whitney U test; the significance level was set at 5%. No statistically significant differences in shear bond strength were observed among the adhesive systems (P = 0.7821) or their interactions with bracket type (P = 0.5449). A significant difference was found when bracket types were compared (P < 0.0001), with the Morelli Ceramic bracket groups showing the highest bond strengths regardless of the adhesive system used. A significant association between adhesives and the Morelli Ceramic bracket was observed for the ARI score (P = 0.0018), with 100% of specimens in the Scotchbond Universal Plus adhesive group retaining more than half of the resin on the tooth. The Bis-GMA-free universal adhesive system achieved the highest percentage of adhesive retention on the tooth for both bracket types.
PMID:40828557
