Influence of Different Ceramics on Resin Cement Knoop Hardness Number
Influence of Different Ceramics on Resin Cement Knoop Hardness Number
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DOI：
10.2341/07-155
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发表时间：
2008-11-01
影响因子：
2.2
通讯作者：
Santos, P. H.
中科院分区：
文献类型：
--
作者：
Borges, G. A.;Agarwal, P.;Santos, P. H.
本研究评价了：1）不同陶瓷对光衰减的影响，所述光衰减可影响树脂粘固剂在聚合后立即和24小时的显微硬度，所述显微硬度以努普硬度数（KHN）测量，和2）不同活化模式的影响（直接光激活，通过陶瓷和化学活化的光活化）。树脂水泥Rely X ARC（3 M ESPE）在覆盖有聚酯膜的特氟隆模具中制备直径为5.0mm、厚度为1.0mm的试样。使用XL 2500固化装置（3 M ESPE）以650 mW/cm（2）直接光活化骨水泥40秒，通过Duceram Plus（DeguDent）、Cergogold（DeguDent）、IPS Empress（Ivoclar）、IPS Empress 2（Ivoclar）、Procera的陶瓷盘进行光活化。（NobelBiocare）、In Ceram Alumina（Vita）和Cercon（DeguDent），具有1.2mm厚度或在不施加光的情况下化学活化。将树脂粘固剂试样弄平，并使用HMV 2显微硬度测试仪（Shimadzu），在离照射表面100针处施加50 g的载荷15秒，并在37 ℃下储存24小时后立即获得KHN。对每个样本进行10次测量，每次每组3个样本。将数据提交至ANOVA和Tukey检验（p=0.05）。树脂水门汀的KHN值不仅受活化方式的影响，还受活化后测试时间的影响。与直接活化即刻和24小时相比，化学活化和通过所有陶瓷的树脂骨水泥的平均KHN显示出统计学显著较低的值。除直接激活外，激活后24小时的KHN始终上级激活后即刻测试。最不透明的陶瓷导致最低的KHN值。
This study evaluated: 1) the effect of different ceramics on light attenuation that could affect microhardness, measured as the Knoop Hardness Number (KHN), of a resin cement immediately and 24 hours after polymerization and 2) the effect of different activation modes (direct light-activation, light activation through ceramics and chemical activation) on the KHN of a resin cement.Resin cement Rely X ARC (3M ESPE) specimens 5.0 mm in diameter and 1.0 nun thick were made in a Teflon mold covered with a polyester film. The cement was directly light activated for 40 seconds with an XL 2500 curing unit (3M ESPE) with 650 mW/cm(2), light activated through ceramic discs of Duceram Plus (DeguDent), Cergogold (DeguDent), IPS Empress (Ivoclar), IPS Empress 2 (Ivoclar), Procera. (NobelBiocare), In Ceram Alumina (Vita) and Cercon (DeguDent), having a 1.2 mm thickness or chemically activated without light application. The resin cement specimens were flattened, and KHN was obtained using an HMV 2 microhardness tester (Shimadzu) with a load of 50 g applied for 15 seconds 100 pin from the irradiated surface immediately and after storage at 37 degrees C for 24 hours. Ten measurements were made for each specimen, with three specimens for each group at each time. The data were submitted to ANOVA and Tukey's test (p=0.05). The KHN of the resin cement was not only affected by the mode of activation, but also by the post-activation testing time. The mean KHN of the resin cement for chemical activation and through all ceramics showed statistically significant lower values compared to direct activation immediately and at 24 hours. The KHN for 24 hours post-activation was always superior to the immediate post-activation test except with direct activation. The most opaque ceramics resulted in the lowest KHN values.