Microtensile bond strength analysis of adhesive systems to Er:YAG and Er,Cr:YSGG laser-treated dentin

Abstract

The aim of this in vitro study was to evaluate the effect of different surface treatments (control, diamond bur, erbium-doped yttrium aluminum garnet (Er:YAG) laser, and erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser) on sound dentin surface morphology and on microtensile bond strength (μTBS). Sixteen dentin fragments were randomly divided into four groups (n = 4), and different surface treatments were analyzed by scanning electron microscopy. Ninety-six third molars were randomly divided into eight groups (n = 12) according to type of surface treatment and adhesive system: G1 = Control + Clearfil SE Bond (SE); G2 = Control + Single Bond (SB); G3 = diamond bur (DB) + SE; G4 = DB + SB, G5 = Er:YAG laser (2.94 μm, 60 mJ, 2 Hz, 0.12 W, 19.3 J/cm(2)) + SE; G6 = Er:YAG + SB, G7 = Er,Cr:YSGG laser (2.78 μm, 50 mJ, 30 Hz, 1.5 W, 4.5 J/cm(2)) + SE; and G8 = Er,Cr:YSGG + SB. Composite blocks were bonded to the samples, and after 24-h storage in distilled/deionized water (37 °C), stick-shaped samples were obtained and submitted to μTBS test. Bond strength values (in megapascal) were analyzed by two-way ANOVA and Tukey tests (α = 0.05). G1 (54.69 ± 7.8 MPa) showed the highest mean, which was statistically significantly higher than all the other groups (p < 0.05). For all treatments, SE showed higher bond strength than SB, except only for Er,Cr:YSGG treatment, in which the systems did not differ statistically from each other. Based on the irradiation parameters considered in this study, it can be concluded that Er:YAG and Er,Cr:YSGG irradiation presented lower values than the control group; however, their association with self-etching adhesive does not have a significantly negative effect on sound dentin (μTBS values of >20 MPa).

Effects of Erbium Family Laser on Shear Bond Strength of Composite to Dentin After Internal Bleaching

“…The water molecules among the hydroxyapatite crystals absorb the beams and evaporate; as a result, the internal pressure increases and microexplosions occur leading to substrate ejection and microstructural alterations. 25,28,29 Although several studies have assessed the effects of erbium family lasers on bleached enamel, 3,[30][31][32] to the best of our knowledge no study has compared the effects of Er:YAG and Er,Cr:YSGG lasers on bleached dentin. Based on our results, Er:YAG laser irradiation led to significantly higher bond strength compared to the control group.…”

Shear Bond Strength of Resin Modified Glass Ionomer Filling Material in Primary Molars Prepared by bond prep mode and cutting mode Er,Cr:YSGG Laser

“…Numerous studies have evaluated the immediate bond strengths of current dental adhesive systems to the dental hard tissues irradiated by Er,Cr:YSGG laser, aiming to determine whether Er,Cr:YSGG laser-irradiated dental hard tissues offer a suitable bonding substrate [5][6][7] . Initial studies revealed that irradiation of the dentin using Er,Cr:YSGG laser leads to increase in surface roughness, with open dentinal tubules and no smear layer on the surface, suggesting that the irradiated dentin might provide a favorable substrate for resin bonding 8,9 .…”

Lazer Uygulamalarinin Protez Kai̇de Tami̇ri̇ni̇n Dayanimina Etki̇si̇

“…3,6,20,21,[26][27][28] Er, Cr; YSGG lazerin sert dokularda, mine ve dentin yüzey-lerinde pürüzlendirmek amacıyla kullanımı pek çok araştırmaya konu olmuştur. [29][30][31][32][33][34] Yine literatüre bakıl-dığında Er:YAG, Nd:YAG, KTP ve CO 2 lazerlerin akrilik rezin yüzeyini pürüzlendirmek amacıyla kullanıldığı birçok araştırma olmasına rağmen, [20][21][22][23][24][25] Er,Cr;YSGG lazerin akrilik rezin tamirinde yüzey işlemi olarak kullanıldığı çalışmanın çok az olduğu görülmektedir. Bu çalışmanın amacı; kumlama ve frezleme gibi mekanik yüzey işlemlerinden sonra değişik enerji seviyelerineki Er,Cr;YSGG lazer uygulamasının otopolimerizan akrille yapılan tamirin transvers dayanıma olan etkisini araştırmaktır.…”