3种黏结剂黏结釉质的界面微渗漏研究

Interfacial microleakage between dental adhesives and enamel

目的:评价3种牙齿黏结剂黏结釉质后界面微渗漏情况。方法:离体尖牙或前磨牙60个,在牙齿的唇颊面磨出直径3mm的釉质平面,用黏结剂(Prime&Bond NT,XenolⅢ,Adper Prompt)黏结釉质平面,并用复合树脂覆盖。24h后在黏结部位中部,以垂直于黏结界面和牙齿长轴的方向切一细槽,深度超过黏结界面。将每种黏结剂黏结的牙齿分为2组,每组10个,其中一组的牙齿进行10000次冷热循环,另一组浸于37℃水中。在牙齿的表面涂指甲油,然后将牙齿浸于500g/L的氨化硝酸银溶液中,24h后取出,再浸于显影液中,8h后取出。将牙齿纵向并垂直于黏结面切成两半,在测量显微镜下测量剖面银从细槽处沿黏结界面渗入的深度,最后在扫描电子显微镜下观察黏结界面处银渗漏情况。结果:Prime&BondNT的未冷热循环组与冷热循环组的银渗漏深度无显著差异(P>0.05),XenolⅢ及Adper Prompt的冷热循环组的银渗漏深度显著大于未冷热循环组(P<0.01)。3种黏结剂间相比,Prime&BondNT的银渗漏显著小于XenolⅢ及Adper Prompt(P<0.01)。结论:自酸蚀黏结剂黏结釉质的密合性差于酸蚀-冲洗型黏结剂,形成的黏结界面的耐老化性能也不好。

AIM： To evaluate marginal adaptation of three dental adhesives. METHODS： A flat enamel surface of 3mm in diameter was prepared on the facial surface of 60 extracted cuspid or bicuspid teeth. Dental adhesives （Prime＆Bond NT, Xenol III, Adper Prompt） were applied and the composite was bonded to the flat surface. A slot was cut through the center of the flat surface perpendicularly to the bonding interface, with a depth in excess of the interface. The teeth bonded by the same adhesive were divided into two groups, one group was subjected to thermocycling （ 10000 , 5 -55℃ ）, another in water. After coated with nail varnish （except the slot）, all teeth were immersed in a solution of 50% buffered silver nitrate and then in a developing solution, followed by secting perpendicularly to the bonded interface and the slot. The silver penetration along the bonded interface was measured under measuring microscope. RESULTS： Prime＆Bond NT presented significantly less leakage than Xenol Ⅲ and Adper Prompt after either water storage or thermocycling （P 〈 0.01 ）. With Prime＆Bond NT, the leakage depth showed no difference between water storage and thermocycling. Xenol Ⅲ and Adper Promp exhibited no difference in leakage depth. CONCLUSIONS ： Marginal adaptation in enamel bonded by acid - etching and rinse adhesive is superior to that by self - etching adhesive.