Erhardt Maria Carolina Guilherme, Lobo Maristela Maia, Goulart Marcelo, Coelho-de-Souza Fabio Herrmann, Valentino Thiago Assuncao, Pisani-Proenca Jatyr, Conceicao Ewerton Nocchi, Pimenta Luiz Andre Freire
Gen Dent. 2014 May-Jun;62(3):56-61.
This article evaluates a pH-cycling model for simulation of caries-affected and caries-infected dentin (CAD and CID, respectively) surfaces, by comparing the bond strength of an etch-and-rinse and a self-etch adhesive system. For both adhesives, bonding to sound dentin (SD) showed that the microtensile bond strength (μTBS) values of SD, CAD, and CID were SD > CAD > CID (P < 0.05). Knoop microhardness number mean values followed the same trend. Adhesive systems were not able to totally penetrate into CAD and CID, forming more irregular resin-dentin interdiffusion zones and atypical resin tags than SD. The tested in vitro pH-cycling caries model allowed the evaluation of specific dentin substrate alterations in response to μTBS. The type of dentin and its histological structure played an important role in etch-and-rinse and self-etch bonding, as lower μTBS values were attained in CAD and CID.
本文通过比较酸蚀冲洗粘结系统和自酸蚀粘结系统的粘结强度，评估了一种pH循环模型，用于模拟受龋影响和感染龋的牙本质表面（分别为CAD和CID）。对于两种粘结剂，与健康牙本质（SD）的粘结显示，SD、CAD和CID的微拉伸粘结强度（μTBS）值为SD>CAD>CID（P<0.05）。努氏显微硬度值平均值遵循相同趋势。粘结系统无法完全渗透到CAD和CID中，与SD相比，形成了更不规则的树脂-牙本质相互扩散区和非典型树脂突。所测试的体外pH循环龋模型允许评估特定牙本质底物变化对μTBS的响应。牙本质类型及其组织结构在酸蚀冲洗粘结和自酸蚀粘结中起重要作用，因为CAD和CID的μTBS值较低。
