Evaluation Of Microleakage In Class II Cavity Preparation Restored Using Zirconomer As Liner And Composite Resin In Closed-Sandwich Technique

Pradhnya Nikhade
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Abstract

Introduction : Microleakage in class II restoration mostly occur due to masticatory stresses and thermal changes which leads to secondary or recurrent caries. To overcome this problem of marginal leakage, Glass Ionomer cement base was used to substantially replace the composite resin restorative material in the proximal box.This technique is known as “composite-laminated GIC” or “sandwich” restoration. In the traditional “closed sandwich” technique there is placement of the zirconomer at the base of the proximal box so as it falls just short of the external cavo surface. This procedure offers no protection from proximal caries until failure of the dentine bonding agent.Materials and method : Twenty-six sound healthy teeth with absence of caries, restoration, cracks and white spots were selected.The proximal box was 4 mm wide bucco-lingually; whereas, the pulpal and axial walls measured to be 2 mm deep. After placement of the Zirconomer at the base of the proximal box such that it falls just short of the external cavo surface, etching and bonding of Zirconomer was done. Composite resin was placed in the proximal box and occlusal surface, leaving the zirconomer encased within the preparation. Samples were then processed for thermocycling. With the help of modelling wax, the apexes of the root were sealed to prevent the ingress of dye. The samples were then coated with nail varnish, applying two coats around all surfaces of teeth leaving 2 mm of the marginal area around the restorations. Immersion of sample was then done in methylene blue dye. Samples were then washed under running water for one minute and then air dried. In next step restorations were sectioned longitudinally through the centre of the tooth. They were sectioned by using diamond disc along with water as coolant. Sections were examined at 32x magnification under a stereomicroscope. SEM observations at the gingival margins of the specimens restored with closed sandwich technique depicted less satisfactory marginal adaptation. Conclusion : It can be concluded that none of the technique tested are free of microleakage. Zirconomer placed in the gingival floor of class II composite restoration may be a practical method to reduce microleakage.
用锆合金作为衬垫和复合树脂封闭夹层技术修复II类腔体微泄漏的评价
II类修复中的微渗漏多是由于咀嚼应力和热变化导致继发或复发龋病。为了克服这一边缘渗漏问题,在近端盒中使用玻璃离子水泥基来替代复合树脂修复材料。这种技术被称为“复合层压GIC”或“三明治”修复。在传统的“封闭三明治”技术中,在近端盒的底部放置锆合金,使其刚好低于外部腔表面。在牙本质粘结剂失效之前,这种方法不能防止近端龋齿。材料与方法:选择无龋、无修复、无裂纹、无白斑的健康牙齿26颗。近端盒体宽4 mm;而牙髓和轴壁的深度为2mm。在近端盒底部放置锆合金后,使其刚好低于外腔表面,进行锆合金的蚀刻和粘合。复合树脂被放置在近端盒和咬合表面,留下锆聚体包裹在制剂中。然后对样品进行热循环处理。在造型蜡的帮助下,根尖被密封以防止染料进入。然后将样品涂上指甲油,在牙齿的所有表面涂上两层指甲油,在修复体周围留下2mm的边缘区域。然后将样品浸入亚甲基蓝染料中。然后将样品在自来水下冲洗一分钟,然后风干。在接下来的步骤中,修复体通过牙齿的中心纵向切片。它们是用菱形圆盘和水作为冷却剂进行切割的。切片在32倍体视显微镜下检查。在封闭三明治技术修复的标本牙龈边缘的扫描电镜观察显示,边缘适应不太令人满意。结论:所有检测方法均存在微渗漏。在II类复合修复的龈底放置锆合金可能是一种减少微渗漏的实用方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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