一步抛光系统对纳米复合材料表面粗糙度和显微硬度的影响。

The influence of one-step polishing systems on the surface roughness and microhardness of nanocomposites.

作者信息

Korkmaz Yonca, Ozel Emre, Attar Nuray, Aksoy Gokhan

机构信息

Department of Conservative Dentistry, School of Dentistry, Baskent University, Ankara, Turkey.

出版信息

Oper Dent. 2008 Jan-Feb;33(1):44-50. doi: 10.2341/07-28.

DOI:10.2341/07-28

PMID:18335732

Abstract

OBJECTIVES

This in vitro study evaluated the surface roughness and microhardness of nanocomposites that contain nanoparticles and a microhybrid composite finished and polished with two different one-step polishing systems and a conventional multi-step polishing system.

METHODS AND MATERIALS

The materials evaluated were Filtek Supreme XT, Grandio, Ceram X, Aelite Aesthetic Enamel, Tetric EvoCeram and Filtek Z250. A total of 240 specimens (10-mm in diameter, 2 mm thick) were fabricated for both tests (n=120 each test) in a plexiglass mold covered with a Mylar strip. After polymerization, five specimens per group received no polishing treatment and served as the control for both tests. For each composite group (n=15), the specimens were randomly divided into three polishing systems: PoGo, OptraPol and Sof-Lex. All polishing systems were applied according to the manufacturers' instructions after being ground wet with 1200 grid silicon carbide paper. The surface roughness values were determined using a profilometer. The microhardness measurements were performed using a digital microhardness tester (load 500 g; dwell time 15 seconds). The data were analyzed using the one-way ANOVA test at a significance level of 0.05 for both tests. Multiple comparison was performed with the Duncan Multiple Range test.

RESULTS

The smoothest surfaces were achieved under Mylar strips in all composite groups (p<0.05). There were no statistically significant differences between polishing systems in the Filtek Supreme XT, Ceram X, Aelite Aesthetic Enamel and Grandio groups for surface roughness (p>0.05). In the Tetric EvoCeram group, Sof-Lex exhibited the highest roughness values. No statistically significant differences were evaluated between polishing systems (p>0.05); whereas, the surfaces under Mylar Strip showed statistically significant lower values than the polished surfaces in terms of microhardness (p<0.05).

CONCLUSION

One-step polishing systems may be successfully used for polishing nanocomposites.

摘要

目的

本体外研究评估了含有纳米颗粒的纳米复合材料以及用两种不同的一步抛光系统和传统多步抛光系统进行修整和抛光后的微混合复合材料的表面粗糙度和显微硬度。

方法和材料

评估的材料有Filtek Supreme XT、Grandio、Ceram X、Aelite Aesthetic Enamel、Tetric EvoCeram和Filtek Z250。在覆盖有聚酯薄膜条的有机玻璃模具中制备了总共240个试样（直径10毫米，厚2毫米）用于两项测试（每项测试n = 120）。聚合后，每组五个试样不进行抛光处理，作为两项测试的对照。对于每个复合材料组（n = 15），试样被随机分为三种抛光系统：PoGo、OptraPol和Sof-Lex。在用1200目碳化硅砂纸湿磨后，所有抛光系统均按照制造商说明使用。使用轮廓仪测定表面粗糙度值。使用数字显微硬度测试仪进行显微硬度测量（载荷500克；保压时间15秒）。两项测试的数据均使用单因素方差分析进行分析，显著性水平为0.05。采用邓肯多重极差检验进行多重比较。

结果

在所有复合材料组中，聚酯薄膜条下的表面最光滑（p<0.05）。在Filtek Supreme XT、Ceram X、Aelite Aesthetic Enamel和Grandio组中，各抛光系统之间的表面粗糙度无统计学显著差异（p>0.05）。在Tetric EvoCeram组中，Sof-Lex的粗糙度值最高。各抛光系统之间未评估出统计学显著差异（p>0.05）；然而，就显微硬度而言，聚酯薄膜条下的表面显示出统计学上显著低于抛光表面的值（p<0.05）。