Center of Stomatology, Peking University Shenzhen Hospital, Guangdong Province Engineering Research Center of Oral Disease Diagnosis and Treatment, Shenzhen 518036, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2021 Aug 1;39(4):453-457. doi: 10.7518/hxkq.2021.04.012.
This work aimed to evaluate the ability of two kinds of antioxidants, namely, grape-seed extract and sodium ascorbate, in restoring bond strength at the resin-enamel interface after bleaching.
Ten groups of samples with 15 teeth per group were prepared for shear-bond-strength test at the resin-enamel interface after bleaching. The groups were as follows: control; no antioxidant; 2.5%, 5%, 10%, or 15% grape-seed extract; and 2.5%, 5%, 10%, or 15% sodium ascorbate. The peak values of shear bond strength when resin was debonded from teeth and the failure modes under a microscope were recorded. Ten other groups of teeth with two teeth per group were prepared and treated in a similar approach before resin bonding. The samples were cut vertically to the bonding interface. The structures of the bonding interface were compared by scanning electron microscopy.
No statistically significant difference in shear bond strength was found among the no-antioxidant, 2.5% grape-seed extract, and 2.5%, 5%, or 10% sodium ascorbate groups (>0.05), which were statistically significantly lower than the control group (<0.05). Evidence of marginal gap was observed at the resin-enamel interface, and resin tags in enamel were short, poorly defined, and fragmented. No statistically significant difference in shear bond strength was found among 5%, 10%, or 15% grape-seed extract, 15% sodium ascorbate, and control groups (>0.05). No evidence of discontinuity was found at the adhesion interface, and resin tags in enamel were long, well defined, and structurally intact. Failure in the adhesive joint was the major debond mode in all experimental groups.
Immediately after bleaching, the bond strength of dental enamel significantly decreased. Bond strength can be restored by 5% grape-seed extract or 15% sodium ascorbate in 5 min.
本研究旨在评估两种抗氧化剂（葡萄籽提取物和抗坏血酸钠）在漂白后恢复牙釉质-树脂界面黏结强度的能力。
对 10 组（每组 15 个牙齿）经漂白处理后的牙釉质-树脂界面进行剪切黏结强度测试用样本制备。各组分别为：对照组；无抗氧化剂；2.5%、5%、10%或 15%葡萄籽提取物；和 2.5%、5%、10%或 15%抗坏血酸钠。记录树脂从牙齿上脱落后的剪切黏结强度峰值和显微镜下的失效模式。另外 10 组（每组 2 个牙齿）用类似的方法进行样本制备和处理，然后再进行树脂黏结。样本沿黏结界面垂直切割。用扫描电子显微镜比较黏结界面的结构。
无抗氧化剂组、2.5%葡萄籽提取物组和 2.5%、5%或 10%抗坏血酸钠组的剪切黏结强度与对照组相比无统计学差异（>0.05），均显著低于对照组（<0.05）。在牙釉质-树脂界面观察到边缘间隙的证据，牙釉质中的树脂标记短、定义差且呈碎片状。5%、10%或 15%葡萄籽提取物组、15%抗坏血酸钠组和对照组之间的剪切黏结强度无统计学差异（>0.05）。在黏附界面未发现不连续的证据，牙釉质中的树脂标记长、定义明确且结构完整。所有实验组的主要脱粘模式均为黏合接头失效。
漂白后即刻，牙釉质的黏结强度显著降低。5 分钟内，5%葡萄籽提取物或 15%抗坏血酸钠可恢复黏结强度。
