J Adhes Dent. 2021;23(1):47-56. doi: 10.3290/j.jad.b916831.
To study the effect of the varnish type, application time and surface polishing on the shear bond strength (SBS) of a universal adhesive in healthy and demineralized bovine enamel.
432 bovine primary central incisors were assigned to 18 groups according to enamel mineralization [healthy and demineralized], topical varnish [Clinpro White Varnish (CWV; 3M Oral Care) and Profluorid (PFV, Voco)], remineralization time [24 h or 21 days] and polishing or not of the enamel surface. Adhesion was tested using Futurabond M (Voco)+ and GrandioSO (Voco). Sheer bond strength (SBS) was measured and the fracture mode studied. The statistical analysis was performed using two-way ANOVA, Tukey's test, and Pearson's chi-squared test.
In healthy bovine enamel, CWV reduced SBS at 24 h and 21 days; polishing significantly improved SBS. PFV increased SBS in healthy enamel at 21 days and demineralized enamel at 24 h and 21 days; polishing had no effect on SBS. The application time and polishing of the enamel surface affected the behavior of varnishes with respect to SBS. There was a correlation between the type of fracture and the degree of mineralization as well as the timepoint of varnish application.
Remineralization of demineralized enamel with fluoride varnishes permits the recovery of the bond strength obtained in healthy enamel. Of the two varnishes studied, PFV had the highest SBS and more uniform behavior, regardless of the application timepoint, degree of mineralization, and surface treatment of the enamel..
研究釉质类型、施涂时间和表面抛光对通用粘结剂在健康和脱矿牛牙釉质剪切粘结强度（SBS）的影响。
根据牙釉质矿化情况[健康和脱矿]、局部釉质涂料[Clinpro White Varnish（CWV；3M Oral Care）和 Profluorid（PFV，Voco）]、再矿化时间[24 小时或 21 天]和牙釉质表面是否抛光，将 432 颗牛原发性中央切牙分为 18 组。使用 Futurabond M（Voco）+和 GrandioSO（Voco）进行粘结测试。测量纯剪切粘结强度（SBS）并研究断裂模式。采用双向方差分析、Tukey 检验和 Pearson 卡方检验进行统计分析。
在健康的牛牙釉质中，CWV 在 24 小时和 21 天降低 SBS；抛光显著提高 SBS。PFV 在 21 天的健康牙釉质和 24 小时和 21 天的脱矿牙釉质中增加 SBS；抛光对 SBS 无影响。牙釉质表面的施涂时间和抛光影响了釉质涂料对 SBS 的作用。断裂类型与矿化程度以及釉质涂料施涂时间点之间存在相关性。
用氟化物釉质对脱矿牙釉质进行再矿化可以恢复健康牙釉质获得的粘结强度。在所研究的两种釉质涂料中，PFV 具有最高的 SBS 和更均匀的性能，无论施涂时间点、矿化程度和牙釉质表面处理如何。
