Bortolotto Tissiana, Monaco Carlo, Onisor Ioana, Krejci Ivo
Division of Cariology and Endodontics, School of Dentistry, University of Geneva, 19, Rue Barthélemy-Menn, CH-1205 Geneva, Switzerland.
Int J Dent. 2010;2010:101095. doi: 10.1155/2010/101095. Epub 2010 Jun 21.
The purpose of this paper was to investigate, by means of marginal adaptation and fracture strength, three different types of single retainer posterior fixed partial dentures (FPDs) for the replacement of a missing premolar. Two-unit cantilever FPDs were fabricated from composite resin, feldspathic porcelain, and fiber-reinforced composite resin. After luting procedures and margin polishing, all specimens were subjected to a Scanning Electron Microscopic marginal evaluation both prior to and after thermomechanical loading with a custom made chewing simulator comprising both thermal and mechanical loads. The results indicated that the highest score of marginal adaptation, that is, the closest score to 100% of continuous margins, at the tooth-composite resin interface was attained by the feldspathic porcelain group (88.1% median), followed by the fiber-reinforced composite resin group (78.9% median). The worse results were observed in the composite resin group (58.05% median). Fracture strength was higher in feldspathic porcelain (196N median) when compared to resin composite (114.9 N median). All the fixed prostheses made of fiber-reinforced composite resin detached from the abutment teeth before fracturing, suggesting that the adhesive surface's retainer should be increased.
本文的目的是通过边缘适应性和断裂强度，研究三种不同类型的单固位体后牙固定局部义齿（FPD）用于替换缺失前磨牙的情况。两单位悬臂式FPD由复合树脂、长石质瓷和纤维增强复合树脂制成。在粘结程序和边缘抛光后，所有标本在使用包含热和机械负荷的定制咀嚼模拟器进行热机械加载之前和之后，都进行了扫描电子显微镜边缘评估。结果表明，长石质瓷组在牙齿-复合树脂界面处获得了最高的边缘适应性评分，即最接近连续边缘100%的评分（中位数为88.1%），其次是纤维增强复合树脂组（中位数为78.9%）。在复合树脂组中观察到较差的结果（中位数为58.05%）。与树脂复合材料（中位数为114.9 N）相比，长石质瓷的断裂强度更高（中位数为196 N）。所有由纤维增强复合树脂制成的固定修复体在断裂前都从基牙上脱落，这表明应增加粘结面的固位力。
