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目的探讨抗氧化剂(抗坏血酸钠和抗坏血酸钠加吐温-80)对人离体牙漂白后树脂修复体微渗漏影响。方法取40颗离体上颌中切牙,行根管治疗后随机分成4组,每组均为10颗。第1组行牙漂白术之后,进行树脂修复。第2组行牙漂白术后,用1 0%抗坏血酸钠处理,最后进行树脂充填。第3组行牙漂白术后,用1 0%抗坏血酸钠和0.2%吐温-80处理,再行树脂充填。第4组不行牙漂白术直接进行树脂修复。处理好后所有标本给予5~55℃热循环1 000次,并用品红进行染色,于体视显微镜下观测微渗漏状况。结果第1组达到了最高的渗漏值,第2组的渗漏值较高,第3组渗漏值较低,第4组渗漏值最低。第1组与第2组渗漏值比较,差异无统计学意义(P>0.05)。第2组与第3组渗漏值相比较,差异有统计学意义(P<0.05)。第3组与第4组渗漏值比较,差异有统计学意义(P<0.05)。结论抗氧化剂可降低行牙漂白术后进树脂修体的微渗漏值。其中新型抗氧化剂(抗坏血酸钠加吐温-80)的效果更加显著。
Objective To investigate the effect of antioxidants (sodium ascorbate and sodium ascorbate plus Tween-80) on microleakage of resin restorations after human teeth tooth bleaching. Methods 40 maxillary central incisors were obtained. After root canal treatment, they were randomly divided into 4 groups with 10 in each group. Group 1 teeth dental bleaching, the resin repair. Group 2 teeth after bleaching, with 10% sodium ascorbate treatment, the final resin filling. Group 3 teeth after bleaching, with 10% sodium ascorbate and 0.2% Tween -80 treatment, and then resin filling. Group 4 no dental bleaching directly resin repair. After treatment, all the specimens were given 1000 cycles of 5 ~ 55 ℃ thermal cycle, and were stained with magenta to observe the microleakage under stereomicroscope. Results Group 1 reached the highest leakage value, group 2 had higher leakage, group 3 had lower leakage and group 4 had the lowest leakage. There was no significant difference in leakage between group 1 and group 2 (P> 0.05). There was significant difference in the leakage value between the second group and the third group (P <0.05). There was significant difference between the third group and the fourth group (P <0.05). Conclusion Antioxidants can reduce the microleakage of resinous prostheses after tooth bleaching. One of the new antioxidants (sodium ascorbate plus Tween -80) effect is more pronounced.