Tagtekin Dilek Arslantunali, Yanikoglu Funda Caliskan, Bozkurt Funda Ozturk, Kologlu Burcu, Sur Haydar
Department of Operative Dentistry, Faculty of Dentistry, Marmara University, Izzet Aksalur Cad. Konaklar Mah, 10/A Daire:1, Yenilevent, Istanbul 80620, Turkey.
Dent Mater. 2004 Jun;20(5):487-97. doi: 10.1016/j.dental.2003.06.004.
The objective of this in vitro study was to evaluate surface roughness, hardness and wear resistance of an Ormocer (Admira), polymerized by a plasma arc system. A secondary objective was to investigate two placement technique bulk or incremental layers.
Blocks from Admira and Amelogen (a microhybrid composite) were prepared in cylinders, 3 mm in diameter, and 2 and 5 mm in thickness (bulk or incrementally placed) and polymerized by a plasma arc and a conventional light system. Surface roughness measurements were taken by a Surface Profilometer on the top of the specimens. Vickers hardness measurements, with a load of 600mN were taken on the top and bottom of 2 mm and top, intermediate and bottom of 5 mm thick specimens. For the wear test, specimes (8 mm in diameter and 2 mm in thickness) of Admira, Amelogen and amalgam were tested in a ball-on design, by circular movements of the antagonist (alumina ball; diameter 10 mm) under 10 N load. For the statistical evaluation of the results of surface roughness, microhardness and wear test; a paired samples t-test and Kruskal-Wallis analysis of variance test, were performed.
Admira showed highest hardness values in all polymerization types at the top surface and this was statistically significant (p < 0.05). These highest hardness values were obtained with conventional polymerization (81.84 +/- 1.167 VHN). Meanwhile, the wear resistance of Admira was found to be higher than Amelogen (Wd(admira) = 0.024 +/- 0.00149 mm3; Wd(amelogen) = 0.032 +/- 0.00075 mm3). However, Admira demonstrated the highest surface roughness value compared to Amelogen, with plasma arc 5 s (0.65 +/- 0.023 microm). Amelogen was found to have the lowest surface roughness value with conventional 40 s (0.45 +/- 0.012 microm).
The results indicated that Ormocer, which was developed by Ormocer technology, demonstrated higher microhardness and wear resistance when compared to a hybrid composite; however, the polishability of Ormocer needs further investigation. Also the selection of visible light activated composite resins exhibited higher surface microhardness values when polymerized with conventional rather than with plasma arc.
本体外研究的目的是评估经等离子弧系统聚合的一种硅氧烷陶瓷（Admira）的表面粗糙度、硬度和耐磨性。第二个目的是研究两种放置技术——整体层或增量层。
将Admira和釉原蛋白（一种微混合复合材料）制成直径3mm、厚度2mm和5mm（整体或增量放置）的圆柱体，通过等离子弧和传统光系统进行聚合。用表面轮廓仪测量试样顶部的表面粗糙度。在2mm厚试样的顶部和底部以及5mm厚试样的顶部、中间和底部进行维氏硬度测量，载荷为600mN。对于磨损试验，将Admira、釉原蛋白和汞合金的试样（直径8mm、厚度2mm）采用球盘设计进行测试，在10N载荷下，通过对抗物（氧化铝球；直径10mm）的圆周运动进行。对于表面粗糙度、显微硬度和磨损试验结果的统计评估，进行了配对样本t检验和Kruskal-Wallis方差分析检验。
Admira在所有聚合类型的顶面均显示出最高硬度值，且具有统计学意义（p<0.05）。这些最高硬度值是通过传统聚合获得的（81.84±1.167维氏硬度）。同时，发现Admira的耐磨性高于釉原蛋白（Wd(Admira)=0.024±0.00149mm³；Wd(釉原蛋白)=0.032±0.00075mm³）。然而，与釉原蛋白相比，Admira在等离子弧照射5s时表面粗糙度值最高（0.65±0.023μm）。釉原蛋白在传统照射40s时表面粗糙度值最低（0.45±0.012μm）。
结果表明，由硅氧烷陶瓷技术开发的硅氧烷陶瓷与混合复合材料相比，具有更高的显微硬度和耐磨性；然而，硅氧烷陶瓷的可抛光性需要进一步研究。此外，可见光活化复合树脂在采用传统方法而非等离子弧聚合时，表现出更高的表面显微硬度值。
