Micro‐shear bond strength of adhesives with different degrees of acidity: Effect on sound and artificially hypermineralized dentin,Microscopy Research and Technique

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Micro‐shear bond strength of adhesives with different degrees of acidity: Effect on sound and artificially hypermineralized dentin
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2019-12-23 , DOI: 10.1002/jemt.23426
Tamíris da Costa Neves ₁ , Cristina Dupim Presoto ₁ , Danielle Wajngarten ₁ , Edson Alves Campos ₂

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This study evaluates the bond strength of four self‐etching adhesive systems with different acidity levels in normal and artificially hypermineralized dentin substrate. Healthy human molars were divided into groups: normal dentin—N (n = 36) and artificially hypermineralized dentin—H (n = 36). Self‐etching adhesive systems Clearfil S³ Bond (n = 9), Optibond All in One (n = 9), Clearfil SE Bond (n = 9), and Adhese (n = 9) were used for both the N and H groups. Transparent cylindrical matrices were positioned on the treated dentin surfaces, filled with composite resin, and light‐cured for 40 s. After the transparent cylindrical matrices were removed, the specimens were stored for 24 hr in a humid environment at 37°C and were subjected to a micro‐shear bond strength test. For each group, a specimen was prepared and evaluated in scanning electron microscope for adhesive interface observation. Normality was confirmed and the two‐way analysis of variance and Games–Howell post‐tests were conducted (α = .05). The data demonstrated an interaction between the adhesive system and type of dentin substrate (p < .01). For normal dentin, all adhesive systems assessed were adequate; however, in the hypermineralized dentin, the Clearfil SE Bond two‐step self‐etching adhesive system with mild pH presented the highest immediate bond strength. There was a predominance of adhesive failures for all adhesive systems in the different dentin substrates evaluated. It was concluded that the self‐etching adhesive systems evaluated were efficient for both substrates, and for the hypermineralized dentin, the Clearfil SE Bond presented a higher bond strength value.

中文翻译：

酸度不同的胶粘剂的微剪切粘结强度：对健全和人工超矿化牙本质的影响

这项研究评估了正常和人工超矿化的牙本质基质中四种具有不同酸度水平的自蚀刻粘合剂体系的粘合强度。健康的人类磨牙分为几组：正常牙本质-N（n = 36）和人工超矿化的牙本质-H（n = 36）。自蚀刻胶粘剂系统Clearfil S ³ Bond（n = 9），Optibond All in One（n = 9），Clearfil SE Bond（n = 9）和Adhese（n= 9）分别用于N和H组。将透明的圆柱状基质放在经过处理的牙本质表面上，填充复合树脂，然后光固化40 s。除去透明圆柱状基体后，将样品在37°C的潮湿环境中保存24小时，并进行微剪切粘结强度测试。对于每组，制备样品并在扫描电子显微镜中评估以观察粘合剂界面。确认正常，并进行了方差和Games-Howell事后检验的双向分析（α = .05）。数据表明，胶粘剂体系与牙本质基质类型之间存在相互作用（p<.01）。对于正常的牙本质，评估的所有粘合系统均足够；但是，在高度矿化的牙本质中，具有中等pH值的Clearfil SE Bond两步自蚀刻胶粘剂系统具有最高的即时粘合强度。在评估的不同牙本质基材中，所有胶粘剂系统的胶粘剂故障占主导地位。结论是，评估的自蚀刻胶粘剂体系对两种基材均有效，而对于超矿化牙本质，Clearfil SE Bond呈现出更高的粘合强度值。

更新日期：2019-12-23

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