Grossman E S, Sparrius O
MRC/University of the Witwatersrand, Dental Research Institute, Johannesburg, South Africa.
J Prosthet Dent. 1990 Nov;64(5):519-22. doi: 10.1016/0022-3913(90)90120-2.
Cervical cavities were prepared in the dentin of intact, extracted premolars and randomly restored with four combinations of three bonding agents and two composite resins. After storage in water, thermocycling, and exposure to a fluorescent dye, specimens exhibiting gross marginal leakage and sealing were selected. The tooth was decalcified and the surface of the composite resin restorations opposite the cavity wall and floor were examined for adaptation between restoration and cavity surface. Both leaking and sealed specimens displayed well-replicated bur indentations on the resin surface, indicating adaptation between cavity surface and restoration. Porosities and voids were present on all restorations, but no single feature was identified that was responsible for sealing or leakage. Although suitable contact was achieved in all cases between the restoration and dentinal cavity, this did not indicate that the restoration could sustain a seal under the experimental conditions of this study.
在完整拔除的前磨牙牙本质中制备颈腔，并随机用三种粘结剂和两种复合树脂的四种组合进行修复。在水中储存、热循环以及暴露于荧光染料后，选择表现出明显边缘渗漏和密封的标本。牙齿脱钙后，检查复合树脂修复体与腔壁和腔底相对的表面，以观察修复体与腔表面之间的贴合情况。渗漏和密封的标本在树脂表面均显示出复制良好的钻针压痕，表明腔表面与修复体之间贴合良好。所有修复体上均存在孔隙和空洞，但未发现导致密封或渗漏的单一特征。尽管在所有情况下修复体与牙本质腔之间都实现了合适的贴合，但这并不表明修复体在本研究的实验条件下能够保持密封。
