Permeability and microleakage of Class II resin composite restorations.
Permeability and microleakage of Class II resin composite restorations.
复制标题
II 类树脂复合修复体的渗透性和微渗漏。
DOI：
10.1016/0300-5712(94)90147-3
复制
发表时间：
1994
影响因子：
4.4
通讯作者：
Pashley,DH
中科院分区：
文献类型：
--
作者：
Prati,C;Tao,L;Simpson,M;Pashley,DH
本研究的目的是评估随时间推移，大II类（MOD）牙列微渗漏的变化。使用了三种不同的牙本质粘结剂和后部树脂复合物的组合，这些组合以前曾显示出前景：Vitrebond/Scotchbond 2加P50、Tripton加Occlusin和Clearfil Photo Bond加Clearfil Photo Posterior。传统的II类洞准备在新鲜提取的第三磨牙。所有牙龈边缘终止于牙骨质-釉质交界处。在0.069 MPa压力下，使用与每个牙齿的髓室连接的流体压力装置来评估渗透性和边缘渗漏。分别于戴入后2、15、45、150 min，戴入后1、2、7、14 d，戴入后1、2、3个月，热循环后，戴入后10个月，咬合负荷后，检测微渗漏。最后，将所有标本暴露于硝酸银溶液中，以染料渗透法测量微渗漏。所有材料植入后即刻的微渗漏均高于植入后1-2天。在4-8周后，所有澄清剂都表现出增加的渗透性，这表明吸湿膨胀不足以跟上澄清剂的水解降解。无论是热循环或咬合应力增加微渗漏的牙列。
The aim of this study was to evaluate the variations in microleakage of large Class II (MOD) restorations over time. Three different combinations of dentine bonding agents and posterior resin composites which had previously shown promise were used: Vitrebond/Scotchbond 2 plus P50, Tripton plus Occlusin and Clearfil Photo Bond plus Clearfil Photo Posterior. Conventional Class II cavities were prepared in freshly extracted third molars. All gingival margins were terminated at the cemento-enamel junction. A fluid-under-pressure apparatus connected with the pulp chamber of each tooth was used to evaluate the permeability and marginal leakage of the restorations at 0.069 MPa. Microleakage was tested after insertion of restorations at 2, 15, 45, 150 min, after l, 2, 7, 14 days, after 1, 2, 3 months, after thermal cycling and 10 months later, after occlusal loading. Finally, all specimens were exposed to silver nitrate solution to measure microleakage as dye penetration. Immediately after insertion of the restorations, all the materials showed a higher microleakage than after 1–2 days. After 4–8 weeks, all the restorations exhibited an increased permeability suggesting that hygroscopic expansion was not sufficient to keep pace with hydrolytic degradation of the restorations. Neither thermocycling or occlusal stresses increased the microleakage of the restorations.