Neiva I F, de Andrada M A, Baratieri L N, Monteiro Júnior S, Ritter A V
Federal University of Santa Catarina, School of Dentistry, Florianopolis, Brazil.
Oper Dent. 1998 Nov-Dec;23(6):282-9.
The purpose of this in vitro study was to compare marginal leakage of class 2 light-cured composite resin restorations, with different insertion and polymerization techniques. Fifty sound premolars extracted for prosthetic purposes were used in the study. Conservative class 2 (MOD) preparations were made in all teeth, with one proximogingival margin on enamel and the other on cementum. All the preparations and restorations were performed by the same operator utilizing the same restorative materials. After restoration the teeth were thermocycled and their gingival margins exposed to a dye. Results showed that the kind of matrix system had no significant influence upon the degree of marginal leakage on enamel. On cementum, oblique and horizontal incremental insertion and polymerization techniques using the collimator cone exhibited the least leakage, while the clear matrix band/reflective wedge technique presented the greatest leakage.
本体外研究的目的是比较采用不同充填和聚合技术的二类光固化复合树脂修复体的边缘微渗漏情况。该研究使用了50颗因修复目的而拔除的健康前磨牙。所有牙齿均制备成保守二类（MOD）洞形，一个近龈边缘位于釉质，另一个位于牙骨质。所有的制备和修复均由同一名操作者使用相同的修复材料完成。修复后对牙齿进行热循环处理，并将其龈边缘暴露于染料中。结果显示，基质系统类型对釉质边缘微渗漏程度无显著影响。在牙骨质上，使用准直仪锥体的斜向和水平分层充填及聚合技术渗漏最少，而透明基质带/反光楔技术渗漏最多。
