Faculty of Dentistry, Ain Shams university, Cairo, Egypt.
Clin Exp Dent Res. 2022 Feb;8(1):248-256. doi: 10.1002/cre2.496. Epub 2021 Sep 25.
To evaluate the micro-shear bond strength of two resin cements to aged laser bleached enamel after the application of three different desensitizing agents.
Forty extracted human central and lateral incisors were prepared and bleached using laser activation bleaching protocol. The teeth were assigned randomly into four groups for desensitization; G1: No post-bleaching treatment, G2: GC MI Paste Plus, G3: Hydroxyapatite nanoparticles (n-HAP) and G4: Flor-Opal. Specimens were subjected to aging for 6 months. All groups were subdivided into two subgroups according to the resin cements used (dual-curing resin cement and light-curing resin cement).
Flor-Opal groups showed the highest statistically significant micro-shear bond strength (MSBS), followed by GC MI Paste Plus and n-HAP groups with no statistically significant difference between them. The light-curing resin cement had statistically higher MSBS than dual-curing resin cement in case of no-post bleaching treatment and n-HAP groups, and no statistical difference in case of GC MI Paste Plus and Flor-Opal groups.
Usage of desensitizing agents containing, CPP-ACP, n-HAP or fluoride after laser bleaching can enhance the bond strength of the resin cements to enamel.
The composition of the desensitizing agents applied after laser bleaching could interfere in bond strength values.
评价三种不同脱敏剂处理后激光漂白牙釉质的微剪切粘结强度。
制备 40 颗人离体中切牙和侧切牙，采用激光激活漂白方案进行漂白。将牙齿随机分为 4 组进行脱敏处理：G1：无后漂白处理；G2：GC MI Paste Plus；G3：纳米羟基磷灰石(n-HAP)；G4：Flor-Opal。标本经过 6 个月的老化处理。所有组均根据所使用的树脂水门汀（双固化树脂水门汀和光固化树脂水门汀）进一步分为两个亚组。
Flor-Opal 组显示出最高的微剪切粘结强度（MSBS），其次是 GC MI Paste Plus 和 n-HAP 组，它们之间没有统计学差异。与无后漂白处理和 n-HAP 组相比，光固化树脂水门汀的 MSBS 显著高于双固化树脂水门汀；而在 GC MI Paste Plus 和 Flor-Opal 组中，两者之间没有统计学差异。
激光漂白后使用含有 CPP-ACP、n-HAP 或氟化物的脱敏剂可以增强树脂水门汀与牙釉质的粘结强度。
激光漂白后应用的脱敏剂成分可能会干扰粘结强度值。
