Universidade de Taubaté (UNITAU), Departamento de Odontologia , Taubaté , SP , Brasil .
Universidade de Brasília (UnB), Faculdade de Ciências da Saúde , Departamento de Odontologia , Brasilia , DF , Brasil .
J Appl Oral Sci. 2023 Oct 27;31:e20230224. doi: 10.1590/1678-7757-2023-0224. eCollection 2023.
This study aimed to evaluate whether the use of desensitizing dentifrices containing obliterating agents can affect bond strength of eroded/abraded dentin.
A total of 100 dentin samples were obtained from human molars. The teeth were cut into 3 mm-thickness discs and allocated in five groups (n=20), according to the toothpaste used: WoF - abrasion with fluoride-free toothpaste (Cocoricó); Arg - toothpaste containing arginine (Colgate Sensitive Pro-Relief); Nov - calcium sodium phosphosilicate toothpaste (Sensodyne Repair and Protect); SnF - fluoride-containing toothpaste (AmF/SnCl2/SnF2 - Elmex Erosion); and Control (no erosive/abrasive process). The erosive/abrasive cycle consisted of immersion in citric acid (1%, pH 2.6, 5 min, 4×/day) and abrasion (2×/day, 120-20 sec abrasion, 100 sec immersion) with each toothpaste. During intervals, samples were immersed in artificial saliva. This cycle was performed for five days. Two resin cylinders (2 mm in diameter) were constructed on each sample for the shear bond strength test using a universal adhesive system. The self-etch and etch-and-rinse (Scotchbond Universal) strategies were employed, each in half of the total sample (n=10). Bond strength (MPa) was measured in a shear test and failure modes were assessed with a stereomicroscope. Statistical analysis was performed using the two-way analysis of variance (ANOVA) and Tukey tests (p<0.05).
A statistically significant difference was found between the adhesive strategies tested (p<0.001), with the self-etching form showing higher values than the etch-and-rinse. Moreover, no significant differences were observed between the tested toothpastes (p=0.750) and interactions (p=0.438).
The use of toothpaste containing obliterating agents does not affect bond strength to dentin subjected to erosive/abrasive conditions when a universal adhesive is used. However, the self-etch strategy might be preferred for eroded/abraded dentin.
本研究旨在评估使用含有封闭剂的脱敏牙膏是否会影响酸蚀/磨损牙本质的粘结强度。
从人磨牙中获得 100 个牙本质样本。将牙齿切成 3 毫米厚的圆盘，并根据使用的牙膏分为五组（n=20）：WoF - 无氟牙膏（Cocoricó）磨损；Arg - 含精氨酸牙膏（Colgate Sensitive Pro-Relief）；Nov - 钙钠磷硅酸钠牙膏（Sensodyne Repair and Protect）；SnF - 含氟牙膏（AmF/SnCl2/SnF2 - Elmex Erosion）；Control - 无酸蚀/磨损过程。酸蚀/磨损循环包括在柠檬酸（1%，pH 2.6，5 分钟，每天 4 次）中浸泡和用每种牙膏进行磨损（每天 2 次，120-20 秒磨损，100 秒浸泡）。在间隔期间，样品浸入人工唾液中。该循环进行五天。在每个样本上构建两个树脂圆柱体（直径 2 毫米），用于使用通用粘结系统进行剪切粘结强度测试。采用自酸蚀和酸蚀-冲洗（Scotchbond Universal）两种策略，每个样本各半（n=10）。在剪切试验中测量粘结强度（MPa），并使用立体显微镜评估失效模式。使用双向方差分析（ANOVA）和 Tukey 检验（p<0.05）进行统计分析。
测试的粘结策略之间存在统计学显著差异（p<0.001），自酸蚀形式的粘结强度高于酸蚀-冲洗。此外，测试的牙膏（p=0.750）和相互作用（p=0.438）之间没有观察到显著差异。
在使用通用粘结剂时，使用含有封闭剂的牙膏不会影响酸蚀/磨损牙本质的粘结强度。然而，对于酸蚀/磨损牙本质，自酸蚀策略可能更受欢迎。
