不同材料暂时冠戴用后牙龈组织中Ki67、P53蛋白的表达

目的:研究4种常用暂时冠戴用后Ki67、P53蛋白在牙龈组织中的表达,探讨4种暂时冠材料的生物学效应。方法:给犬进行自凝塑料、热凝塑料、DMG-TEMP复合树脂和松风SWIFT-TEMP树脂暂时冠修复,建立实验动物模型。应用免疫组化Envision二步法检测戴冠前、戴冠后1周、2周及1月时Ki67、P53蛋白在牙龈组织中的表达,并观察HE切片。结果:自凝塑料暂时冠和热凝塑料暂时冠戴用后,牙龈组织中Ki67、P53蛋白的阳性表达率逐渐升高,戴冠1周后达到最高,随后逐渐降低;而DMG-TEMP树脂暂时冠和SWIFT-TEMP树脂暂时冠戴用后,Ki67、P53的阳性表达率与空白对照组无统计学差异,随时间延长亦无明显改变。结论:自凝塑料暂时冠和热凝塑料暂时冠戴用后,牙龈组织中Ki67、P53蛋白表达明显,而DMG-TEMP和SWIFT-TEMP树脂暂时冠戴用后表达不明显。4种材料暂时冠并未造成长时期的牙龈上皮细胞异常增殖。

Expression of Ki67 and P53 proteins in gingival tissue after wearing four kinds of temporary crowns

Objective:To study the expression of Ki67 and P53 proteins in gingival tissue after wearing four kinds of temporary crowns.Methods:The experiment animal model was established by temporary prosthesis on dogs' teeth using chemical-curing resin,thermal-curing resin,DMG-TEMP crown material and SWIFT composite resin respectively.The immunohistochemistry Envision method was used to measure the expression of Ki67 and P53 proteins in gingival tissue before tooth preparation,after tooth preparation,1-and 2-week,1 month after wearing the crowns.The teeth without any treatment were surved as control.HE stained gingival tissue slices were observed under microscope.Results:The expression of Ki67 and P53 proteins in gingival tissue increased 1 week after wearing the chemical-curing resin crowns or thermal-curing resin crowns(P<0.01),then decreased gradually.The expression of Ki67 and P53 proteins in DMG-TEMP and SWIFT resin groups was similar to that in control group(P>0.05).No pathological change was observed in all the samples.Conclusion:Chemical-curing resin crowns and thermal-curing resin crowns may increase the expression of Ki67 and P53 proteins in gingival tissue,but DMG-TEMP crowns and SWIFT resin crowns do not.None of the four kinds of temporary crowns may cause abnormal proliferation of gingival epithelia.