da Silva João Maurício Ferraz, da Rocha Daniel Maranha, Travassos Alessandro Caldas, Fernandes Virgílo Vilas Boas, Rodrigues José Roberto
São José dos Campos Dentistry School, São Paulo State University, Brazil.
Eur J Esthet Dent. 2010 Autumn;5(3):288-98.
The objective of the study was to evaluate the effect of immediate polishing, after 24 h and after 1 week, on the surface roughness of two micro-hybrid resins (Esthet-X; Opallis) and one nanoparticle resin (Filtek Z350), as well as verifying maintenance of the polish after 1 year, simulated by means of thermal cycling. Forty-three specimens of each material were made and divided into a control group and three experimental groups. The control group specimens received no surface treatment. Group 1 received finishing with an extra-fine diamond drill and posterior polishing with the systems Enhance and PoGo, immediately after polymerization. Group 2 received the same procedures; however, these were carried out after 24 h of storage. Group 3 received the surface treatment after 7 days of storage. After that, the surface roughness was evaluated by a profilometer. After the initial reading, the specimens were submitted to thermal cycling for 10,000 cycles. After thermal cycling, a new roughness reading was taken. The results showed a higher roughness value for the resin Esthet-X, and the resins Opallis and Z350 presented the same roughness values. As regards the time when polishing was performed, specimens polished immediately after polymerization presented higher roughness values in comparison with the other two periods. After thermal cycling, the statistical analysis showed that the Opallis resin polish had been maintained, whereas for the other two resins, there was a significant reduction in surface smoothness. The surface roughness was influenced by the material and also by the period of polishing; the surface roughness of all tested materials were at a clinically acceptable level.
本研究的目的是评估即时抛光、24小时后抛光和1周后抛光对两种微混合树脂（Esthet-X；Opallis）和一种纳米颗粒树脂（Filtek Z350）表面粗糙度的影响，以及通过热循环模拟验证1年后抛光效果的维持情况。每种材料制作了43个样本，并分为一个对照组和三个实验组。对照组样本未进行表面处理。第1组在聚合后立即用超细金刚石钻头进行修整，并用Enhance和PoGo系统进行后续抛光。第2组接受相同的操作；然而，这些操作在储存24小时后进行。第3组在储存7天后进行表面处理。之后，用轮廓仪评估表面粗糙度。在初始读数后，将样本进行10000次热循环。热循环后，再次读取粗糙度。结果显示，Esthet-X树脂的粗糙度值较高，Opallis树脂和Z350树脂的粗糙度值相同。关于抛光时间，与其他两个时间段相比，聚合后立即抛光的样本粗糙度值更高。热循环后，统计分析表明Opallis树脂的抛光效果得以维持，而对于其他两种树脂，表面光滑度有显著降低。表面粗糙度受材料和抛光时间的影响；所有测试材料的表面粗糙度均处于临床可接受水平。
