Guelmann M, Fuks A B, Holan G, Grajower R
Department of Pedodontics, Hebrew University, Hadassah Faculty of Dental Medicine, Jerusalem, Israel.
ASDC J Dent Child. 1989 Jul-Aug;56(4):277-82.
The aims of this in vitro investigation were: 1) to assess marginal leakage around three types of class II restorations, using: a) a composite resin with a glass ionomer lining; b) a glass ionomer cerment with composite resin coverage; c) a glass ionomer cermet without composite resin coverage and 2) to study the effect of thermocycling on marginal defects, by means of radiographs and SEM micrographs of the margins. Fifty-eight class II cavities were prepared in extracted primary molars. The teeth were divided into three groups and restored as follows: Group A--Ketac Bond (liner) and P-30; Group B--Ketac Silver and P-30(sandwich); Group C--Ketac Silver only. The restored teeth were thermocycled and marginal leakage was assessed from the degree of dye penetration on the sections. Dye penetration at the occlusal margins increased in the sequence A less than B less than C. The differences between group C and Groups A and B were statistically significant. Severe penetration of the dye was observed at the cervical margins with no statistically differences between the groups. Deterioration of margins due to thermocycling was observed for all groups, but these defects were not evident on the radiographs. Ketac Silver with and without composite coverage did not prevent marginal leakage when utilized in class II restorations in vitro.
1）使用以下材料评估三类II类修复体周围的边缘渗漏情况：a）带有玻璃离子衬层的复合树脂；b）覆盖有复合树脂的玻璃离子水门汀；c）未覆盖复合树脂的玻璃离子金属陶瓷；2）通过边缘的X线片和扫描电子显微镜照片研究热循环对边缘缺陷的影响。在拔除的乳磨牙上制备了58个II类洞。将牙齿分为三组并进行如下修复：A组——使用Ketac Bond（衬层）和P-30；B组——使用Ketac Silver和P-30（夹层）；C组——仅使用Ketac Silver。对修复后的牙齿进行热循环处理，并根据切片上染料渗透程度评估边缘渗漏情况。咬合边缘的染料渗透程度按A组小于B组小于C组的顺序增加。C组与A组和B组之间的差异具有统计学意义。在颈部边缘观察到染料严重渗透，各组之间无统计学差异。所有组均观察到由于热循环导致边缘恶化，但这些缺陷在X线片上不明显。在体外II类修复中使用有复合覆盖层和无复合覆盖层的Ketac Silver均不能防止边缘渗漏。
