Quero Isabela Barbosa, Faraoni Juliana Jendiroba, Corsini Fernandes Ana Luísa, Reis Derceli Juliana Dos, Palma-Dibb Regina Guenka
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
J Conserv Dent. 2022 Nov-Dec;25(6):616-620. doi: 10.4103/jcd.jcd_257_22. Epub 2022 Oct 13.
It is still unclear whether the pretreatment for dentin hypersensitivity can interfere with the adhesive-dentin bonding strength. This study aimed to evaluate the effect of pretreatment with a casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) paste and diode laser on the shear bond strength of the etch-and-rinse adhesive system in the adhesive-dentin interface.
Seventy-five bovine root specimens were randomly divided into five experimental groups ( = 15). Samples were eroded by six cycles of immersion in hydrochloric acid solution (0.01M; pH = 1.2) for 20 s each, at 45 min intervals, and treated with: G2 - no treatment, G3 - CPP-ACP, G4 - diode laser (970 nm), and G5 - CPP-ACP + Diode laser. After treatments, the morphology of the specimens was analyzed.
The fracture mode of each group was evaluated after restoration with composite resins in the treated area. Data were analyzed by the one-way ANOVA and Tukey's test ( < 0.05). G3 showed the highest values for shear bond strength; there was no significant difference among G1, G3, and G5 ( > 0.05). The adhesive fracture was predominant for all groups.
The use of desensitizers containing CPP-ACP, associated or not with a diode laser, increased the bond strength of the etch-and-rinse adhesive system on eroded root dentin.
牙本质过敏症的预处理是否会影响牙本质与粘结剂之间的粘结强度仍不明确。本研究旨在评估酪蛋白磷酸肽-无定形磷酸钙（CPP-ACP）糊剂和二极管激光预处理对酸蚀冲洗粘结系统在牙本质粘结界面处剪切粘结强度的影响。
将75个牛牙根标本随机分为5个实验组（每组n = 15）。标本经六个循环的盐酸溶液（0.01M；pH = 1.2）浸泡侵蚀，每次浸泡20秒，间隔45分钟，并进行以下处理：G2 - 不处理，G3 - CPP-ACP处理，G4 - 二极管激光（970 nm）处理，G5 - CPP-ACP + 二极管激光处理。处理后，对标本的形态进行分析。
在处理区域用复合树脂修复后，评估每组的断裂模式。数据采用单因素方差分析和Tukey检验进行分析（P < 0.05）。G3组的剪切粘结强度值最高；G1、G3和G5组之间无显著差异（P > 0.05）。所有组均以粘结剂断裂为主。
使用含CPP-ACP的脱敏剂，无论是否联合二极管激光，均可提高酸蚀冲洗粘结系统在侵蚀牙根牙本质上的粘结强度。
