In Vitro Composite Bond Strength to Laser Treated Enamel (original) (raw)

Abstract

ABSTRACT Objective: To determine the effect of self-etch adhesives and various laser conditioning methods on composite bond strengths to enamel. Methods: Extracted human teeth were divided into one of the following enamel surface conditioning groups: Laser/Er,Cr:YSGG (L), Laser + Excavation (LE), Laser + Excavation + Acid-etch (LEA) and a Bur Treatment Control (C). The conditioning groups were further divided into three self-etch adhesive subgroups: One-up Bond (OB), Bond Force (BF), and AdheSE One (AO). Adhesives were applied to conditioned enamel according to the manufacturer's instructions and bonded to composite (cylinder d =2.3mm) using a standard halogen curing light. Specimens were stored at 37C at 100% humidity for 24 hours and subjected to shear bond testing. Two-way ANOVA and Tukey's post hoc test for comparison of means were calculated at the 0.05 level of significance. Results: Means (SD) of enamel bond strengths (MPa) were: Adhesives Method OB BF AO Laser 10.1 (3.6) 11.7(4.3) 12.8(4.6) Laser + Excavation 10.4(3.5) 9.4(3.1) 11.8(3.8) Laser + Excavation + Acid Etch 19 (7.3) 15.5(5.2) 17.6(5.4) Bur Control 17.1(4.4) 15.1(3.4) 11.5(4.1) No significant difference in main effects among adhesives (p=0.46) was found. However, a significant difference was found for methods (p<0.01) and main effect interactions (p=0.046). Among method groups, LEA showed significantly higher bond strengths than L and LE (p<0.01), but not compared to the control (p=0.063). Conclusions: Enamel bond strength showed variable outcomes among adhesives dependent on laser conditioning methods. When treating enamel with a laser, the LEA technique showed high bond strengths on the same level as a bur control. Supported in part by Tokuyama Dental Corp. -------------------------

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