渗透树脂与流体树脂封闭牙本质小管的实验研究

Experimental study on the sealing of dentin tubules by penetrating resin or fluid resin

目的:观察渗透树脂与流体树脂在自酸蚀粘接及全酸蚀粘接条件下对暴露牙本质小管的封闭效果。方法:将60颗健康离体牙随机分为4组(n=15),在不同粘接条件下对暴露的牙本质进行粘接,A组采用Icon-Etch酸蚀,渗透树脂Icon-Infiltrant粘接;B组采用SE-Bond酸蚀粘接,Icon-Infiltrant粘接;C组采用SE-Bond酸蚀粘接,流体树脂FiltekTMZ350XT粘接;D组采用格鲁玛酸酸蚀,Prime&Bond NT和FiltekTMZ350XT粘接,扫描电镜观察各组树脂粘接面形态,测量混合层、粘接剂层的平均厚度及树脂突的平均长度。结果:渗透树脂与流体树脂一样在暴露牙本质表面形成紧密嵌合,D组混合层厚度最厚,C组的粘接剂层最厚,而A组渗入到牙本质小管中的树脂突最长,有统计学差异(P<0.05)。结论:渗透树脂可渗透入暴露的牙本质小管形成树脂突,封闭牙本质小管,其作用优于自酸/全酸粘接的流体树脂。

Objective： To study the sealing effect of penetrating resin and fluid resin on the exposed dentin with self-etching and total-etching methods,respectively. Methods： 60 fresh extracted teeth were randomly divided into 4 groups（ n = 15）. The enamel layer at the tooth neck was cut off,the dentin layer was exposed and adhered with penetrating resin Icon-Infiltration following Icon-Etch etching（ group A）,Icon-Infiltration following SE-Bond etching（ group B）,FiltekTMZ350 X following SE-Bond etching（ group C） and Prime Bond NT combined with Filtek（TM）Z350 XT following Gluma acid etching（ group D）,respectively. The morphological change of the dentin-resin interface was examined by the scanning electron microscope. The thickness of adhensive layer hybrid layer and the length of resin tag were measured. Data were statistically analysed. Results： Tight adhesion layer was observe in all groups. The hybrid layer of the adhesive interface of group D was thicker than that of other groups（ P〈0. 05）; the resin tags in the dentin tubules of group A were longer than those of other groups（ P〈0. 05）; the bonding agent layer of group C was the thickest（ P〈0. 05）. Conclusion： The penetrating resin can form more effective protection layer on the exposed dentin surface and longer resin tags pernertrating into the dentin tubules than self-etch / total-etch bond system with fluid resin.