Comparison of Shear-bond Strength of Composite Restoration to Intact Enamel of Primary Incisors Using Different Conditioners and Adhesive Systems

Background: Esthetic demands among patients have led to the introduction of tooth-colored restorations. Composite resins bond to enamel applying acid etch technique. Total etch adhesion systems are still considered as a golden standard among bonding systems. However, clinicians have tendency towards using adhesive systems with a simplified application procedure. The aim of the present study is to compare the shear-bond strength of composite restoration to intact enamel of primary incisors using different conditioners and adhesive systems.Materials and Methods: This experimental study was conducted at Shiraz University of Medical Sciences. 53 teeth were classified into 5 groups based on their bonding procedure. After composite build-up, specimens were placed in a universal testing machine at a cross-head speed of 1mm/min. Inter-group comparison of shear-bond strength to enamel was analyzed employing One-way-ANOVA and Tukey post-hoc test. Data were statistically analyzed using SPSS (Version 17, Chicago, IL, USA).Results: The highest shear-bond strength was related to the second (37% phosphoric acid etching + Margin Bond adhesive system), and the fifth group (37% phosphoric acid etch + Tokuyama Bond Force adhesive system). The lowest bond strength was related to the third group (Tokuyama Bond Force adhesive system alone) (P value = 0.00).Conclusion: Based on the results of the present study, surface pre-treatment with 37% PA accompanied by self-etching adhesive system, increased shear-bond strength in vitro. This method can be further studied in clinical settings.