Shear Bond Strength of Different Adhesive Systems on Enamel Prepared by Er: YAG LASER
Authors: Patrícia T. Pires, João C. Ferreira, Álvaro F. Azevedo, Sofia Arantes-Oliveira, Walter R. Dias, Paulo R. Melo
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To evaluate Shear Bond Strength (SBS) values of different dental adhesives on Er:YAG laser prepared enamel and bur prepared enamel, one hundred and fifty bovine incisors were randomly assigned to SBS tests on enamel (n=15) in ten different groups. Groups 1 to 5 were prepared with Er:YAG laser. Groups 6 to 10 were mechanical prepared. Followed by: Group 1 and 6 – 37% phosphoric acid (PA) + ExciTE®; Group 2 and 7 – AdheSE®; Group 3 and 8 – FuturaBond® NR; Group 4 and 9 – ExciTE®; Group 5 and 10 – Xeno® V. After the adhesive systems samples were subjected to thermal cycling, SBS were performed in an universal testing machine at 5mm/min. Data were treated with two-way ANOVA, and post-hoc test (Student knewman keuls) (p<0,05). Chi-squared statistical tests were used to evaluate the type of fractures. Mean SBS values were Group 1– 47,17+/-6,25MPa; Group 2–29,10+/-5,21MPa; Group 3–23,32+/ -5,93MPa; Group 4 - 32,56+/-6,36MPa; Group 5– 24,43+/-6,76 MPa; Group 6- 26,12+/-6,32 MPa; Group 7– 14,77+/-3,47MPa, Group 8– 21,03+/-7,44MPa, Group 9– 3,25+/-2,91MPa; Group 10– 16,38+/-7,64 MPa. Statistical analysis of the data revealed that different preparation methods yielded significantly different shear bond strengths. Er:YAG laser preparation of enamel yielded higher bond strengths compared with traditional preparation.