Efeito do laser de Er: YAG na resistência de união ao esmalte e à dentina submetidos ao clareamento dental.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The aim of this study was to evaluate the influence of different energy parameters of Er:YAG laser (_= 2.94m) on microtensile bond strength (μTBS) and morphology of bleached bovine teeth in enamel (manuscript 1) and dentin (manuscript 2) to resin composite. For enamel evaluation bovine teeth were bleached (n=30) or not (n=30) with 16% carbamide peroxide, afterwards flattened and divided in two subgroups according Er:YAG irradiation: 25.56 J/cm2 (ablative, contact mode, LA) or 4.42 J/cm2 (sub-ablative, non-contact mode, LB). The slabs were restored with Adper Single Bond 2 and Filtek Z250 (3MESPE), sectioned in hour-glass shape and were subjected to μTBS test. For dentin evaluation, 40 slabs were divided and 2 groups bleached (n=20) or not (n=20) that were flattened to expose dentin, being one group Er:YAG laser irradiated (25.52 J/cm2, focused mode), prepared for μTBS test, failure type. μTBS data were analyzed by two-way ANOVA and Tukey test (_=0.05). Failure mode was determined at a magnification of 100X using a stereomicroscope and one treated slab of each group was selected for scanning electron microscope (SEM) analysis. A high amount of adhesive failure was recorded for bleached and lased enamel surface tested. Based on the results, one can conclude that bleached enamel surface did not show statistical difference from the non-bleached enamel surface for μTBS values. Er:YAG laser irradiation (LA) prior to adhesive procedure on bleached enamel surface had no influence on μTBS and promoted ablation as observed using SEM. On the other hand, Er:YAG laser irradiation (LB) prior to adhesive procedure did not affect the μTBS and did not promote ablation observed under SEM. Bleaching procedure did not affect μTBS values on dentin. Er:YAG laser irradiation with 25.52 J/cm2 prior to bonding did not affect μTBS on dentin of bleached teeth but impaired μTBS of non-bleached teeth and promoted ablation observed under SEM.

ASSUNTO(S)

ablação com laser, laser er:yag, microscopia eletrônica de varredura, microtração, resistência de união, clareamento dental odontologia laser ablation, er:yag laser, scanning electron microscope, microtensile bond strength, dental bleaching

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