Objective:

The shear bond strength (SBS) of composite resin cement and color change to enamel bleached with two different concentrations of hydrogen peroxide (HP) bleaching agents in combination with two different laser applications was evaluated.

Materials and Methods:

The Er: YAG laser (λ = 2940 nm) and diode laser (λ = 940 nm) were used with the bleaching agent consisting of 40% HP opalescence (Opalescence Xtra Boost, Ulgen, South Jordan, UT, USA) and 35% HP whiteness (Whiteness HP Blue, FGM Dental Products, Joinville, SC, Brazil). Seventy-two human extracted teeth were randomly divided into two groups: For the 40% HP treatment, 36 specimens were divided into three subgroups: (1) HP agent with no laser treatment, (2) HP agent treated with Er: YAG laser, and (3) HP agent treated with diode laser. The same protocol was performed for the 35% HP. The color change was analyzed using the Commission Internationale de l’ Eclairage (CIE) L*a*b* system and surface roughness was analyzed by an atomic force microscope. The specimens were bonded with resin cement and a shear bond test was performed at 0.5 mm/min. The failure surfaces were evaluated using scanning electron microscope analysis.

Results:

ΔE value of the 40% HP + Er: YAG group was significantly higher than the other groups while diode groups showed the lower SBS values than the control groups (p < 0.05).

Conclusions:

The Er: YAG laser with 40% HP may be effective for the brighter teeth and the use of Er: YAG laser produced higher adhesion between enamel and resin cement than diode laser.

中文翻译：

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用Er：YAG和二极管激光漂白后评估树脂水泥与牙釉质的剪切粘结强度

目的：

结合两种不同的激光应用，评估了复合树脂水泥的剪切粘结强度（SBS）和用两种不同浓度的过氧化氢（HP）漂白剂漂白的牙釉质的颜色变化。

材料和方法：

Er：YAG激光器（λ = 2940 nm）和二极管激光器（λ = 940 nm）与漂白剂一起使用，该漂白剂包括40％的HP乳光（Opalescence Xtra Boost，Ulgen，South Jordan，UT，美国）和35％的HP白度（Whiteness HP Blue，FGM牙科产品，Joinville，SC，巴西）。将72颗人类拔牙随机分为两组：对于40％HP处理，将36个标本分为三个亚组：（1）未经激光处理的HP药剂，（2）用Er：YAG激光治疗的HP药剂， （3）用二极管激光器处理过的HP剂。对35％的HP执行相同的协议。使用国际照明委员会（CIE）L * a * b分析颜色变化*通过原子力显微镜分析系统和表面粗糙度。将样品用树脂胶粘剂粘结，并以0.5mm / min进行剪切粘结测试。使用扫描电子显微镜分析评估破坏表面。

结果：

Δ Ë 40％HP +铒的值：YAG组比其他组显著较高，而二极管组显示下SBS值比对照组（p <0.05）。

结论：

具有40％HP的Er：YAG激光可能对牙齿更亮更有效，并且Er：YAG激光的使用比二极管激光在牙釉质和树脂胶粘剂之间产生更高的附着力。