Oberg Carolina, Pochapski Marcia Thais, Farago Paulo Vitor, Granado Carlos Jose Fernandes, Pilatti Gibson Luiz, Santos Fabio Andre
Department of Dentistry, State University of Ponta Grossa, Parana, Brazil.
Gen Dent. 2009 Sep-Oct;57(5):496-501; quiz 502-3, 535-6.
One hundred twelve specimens from bovine incisors were divided into eight groups: Group 1 (treated with 10% strontium chloride gel), Group 2 (treated with 2% sodium fluoride gel), Group 3 (treated with 2% stannous fluoride gel), Group 4 (treated with 5% potassium nitrate gel), Group 5 (treated with 10% potassium nitrate gel), Group 6 (treated with 3% potassium oxalate gel), Group 7 (treated with hydroxyethylcellulose gel), and Group 8 (which received no treatment). Dentinal tubules were exposed after 0.5 mm of deep abrasion using a carbide bur and EDTA gel application. After each treatment, dentin permeability, tubule occlusion, and chemical elements on dentin were analyzed. There was a significant difference among groups in dentin permeability (p < 0.05 ANOVA). Groups 4, 5, and 6 showed the lowest values, while Groups 1, 7, and 8 exhibited the highest. Groups 1, 2, 3, 7, and 8 showed open dentinal tubules, Groups 4 and 5 had partial tubule occlusion, and most of the tubules in Group 6 were obliterated. Energy-dispersive x-rays revealed similar chemical characteristics among the experimental agents used, with traces of strontium, fluoride, sodium, and potassium. Within the limits of the study, 3% potassium oxalate gel showed the best results in terms of dentin permeability and dentinal tubule occlusion.
从牛切牙获取的112个样本被分为八组：第1组（用10%氯化锶凝胶处理），第2组（用2%氟化钠凝胶处理），第3组（用2%氟化亚锡凝胶处理），第4组（用5%硝酸钾凝胶处理），第5组（用10%硝酸钾凝胶处理），第6组（用3%草酸钾凝胶处理），第7组（用羟乙基纤维素凝胶处理），以及第8组（未接受处理）。使用硬质合金车针进行0.5毫米深度的磨损并涂抹乙二胺四乙酸（EDTA）凝胶后，牙本质小管被暴露出来。每次处理后，对牙本质渗透性、小管堵塞情况以及牙本质上的化学元素进行分析。各小组之间在牙本质渗透性方面存在显著差异（方差分析，p < 0.05）。第4、5和6组的值最低，而第1、7和8组的值最高。第1、2、3、7和8组显示牙本质小管开放，第4和5组有部分小管堵塞，第6组的大多数小管被封闭。能量色散X射线显示所用实验试剂具有相似的化学特征，含有微量的锶、氟、钠和钾。在本研究范围内，3%草酸钾凝胶在牙本质渗透性和牙本质小管堵塞方面显示出最佳效果。
