Kleitches A J, Lemon R R, Jeansonne B G
Department of Endodontics, Louisiana State University School of Dentistry, USA.
J Tenn Dent Assoc. 1995 Jan;75(1):31-4.
This study evaluated the coronal microleakage of endodontic access preparations restored with glass ionomer cement (GIC), composite resin (CR), or the "sandwich" (GIC/CR) techniques. The size of access preparation for 32 freshly extracted maxillary premolars was standardized by using a stainless steel template. The teeth were randomly divided into three experimental groups of 10 teeth and one group of two control teeth. Group One: light cured glass ionomer cement, Vitra Bond (3M Dental Products Division, St. Paul, MN). Group Two: composite resin, Silux Plus (3M Dental Products Division, St. Paul, MN). Group Three: "sandwich" technique, consisting of a 3 mm glass ionomer cement base and composite resin restoring the remaining access. The restorative materials were placed incrementally and cured from the facial, lingual and occlusal planes for 20-second intervals. The teeth were thermocycled for 24 hours, immersed in methylene blue dye for 48 hours, and then sectioned to measure dye penetration. This study differed substantially from similar leakage studies. The "sandwich" (GIC/CR) and the composite resin restorations allowed significantly less coronal leakage than the glass ionomer cement restorations. Although not statistically significant, less leakage was measured with the "sandwich" restoration than the composite resin restoration.
本研究评估了用玻璃离子水门汀（GIC）、复合树脂（CR）或“三明治”（GIC/CR）技术修复的根管口预备的冠部微渗漏情况。使用不锈钢模板将32颗新鲜拔除的上颌前磨牙的根管口预备尺寸标准化。将牙齿随机分为三个实验组，每组10颗牙，以及一组两颗对照牙。第一组：光固化玻璃离子水门汀，Vitra Bond（3M牙科产品部，明尼苏达州圣保罗）。第二组：复合树脂，Silux Plus（3M牙科产品部，明尼苏达州圣保罗）。第三组：“三明治”技术，由3毫米厚的玻璃离子水门汀基底和复合树脂修复剩余的根管口组成。修复材料逐层放置，并从颊面、舌面和咬合面进行固化，每次固化20秒。将牙齿进行24小时的热循环处理后，浸泡在亚甲蓝染料中48小时，然后进行切片以测量染料渗透情况。本研究与类似的渗漏研究有很大不同。“三明治”（GIC/CR）和复合树脂修复体的冠部渗漏明显少于玻璃离子水门汀修复体。虽然差异无统计学意义，但“三明治”修复体的渗漏量比复合树脂修复体少。
