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Purpose: The aim of this study was to evaluate the influence of the enamel treatment with Er:YAG laser on the bond strength of self-etching adhesives. Materials and methods: One-hundred bovine incisors were ground to obtain flat enamel surfaces. The bond area was delimited with 3 mm diameter adhesive tape. Specimens were divided in two groups: Group L: Enamel surface received Er:YAG laser application (Kavo KEY 3) at 300 mJ/6 Hz in sweeping mode for 30 seconds; Group N: Enamel surface received no additional treatment. Each group was divided into five subgroups according to self-etching adhesive: SE N/CL—19.55(±3.78)a; N/OU—15.57(±2.85)ab; N/XE—15.32(±4.00)b; L/CL— 13.91(±2.54)b; L/OU—13.16(±2.17)bc; L/XE—9.74(±1.65)cd; N/SE L/FB—8.30(±2.27)d; L/S&E—6.56(±1.55)d. Conclusion: It was concluded that the enamel surface treatment with Er:YAG laser reduced the bond strength significantly for most of the self-etching adhesives tested.

Influence of Er: Yag Laser on Shear Bond Strength of Self-etching Adhesives to Bovine Enamel: In vitro Study