Öztürk Elif, Bolay Şükran, Hickel Reinhard, Ilie Nicoleta
Department of Restorative Dentistry, Faculty of Dentistry, Hacettepe University , Ankara , Turkey.
Acta Odontol Scand. 2015;73(7):503-7. doi: 10.3109/00016357.2014.996185. Epub 2015 Feb 2.
The aim of this study was to evaluate the micro-mechanical properties of a light-cured resin cement in four different shades when polymerized through a leucite-reinforced glass-ceramic in different shades and thicknesses.
A light-cured resin cement in four different shades (HV+1, HV+3, LV-1 and LV-3) was selected for this study. The specimens were cured by using a LED-unit (Bluephase®, IvoclarVivadent) for 20 s under a leucite-reinforced glass-ceramic (IPS Empress® CAD, IvoclarVivadent) in two different shades (A1 and A3) of different thicknesses (1 and 2 mm). Specimens cured directly, without an intermediate ceramic, served as control. The specimens were stored after curing for 24 h at 37°C by maintaining moisture conditions with distilled water. Micro-mechanical properties (indentation modulus, E; Hardness, HV; creep, Cr) of the resin cements were measured with an automatic microhardness indenter (Fisherscope H100C, Germany). Twenty groups were included (n = 3), while 10 measurements were performed on each specimen. Data were statistically analyzed by using one-way ANOVA and Tukey's post-hoc test, as well as a multivariate analysis to test the influence of the study parameters.
Significant differences were observed between the micromechanical properties of the tested resin cements (p < 0.05). The resin cement shade showed the highest effect on the micromechanical properties (Partial-eta squared (ηP(2))-E = 0.45, ηP(2)-HV = 0.59, ηP(2)-Cr = 0.29) of the resin cement, followed by ceramic thickness (ηP(2)-E = 0.38, ηP(2)-HV = 0.3, ηP(2)-Cr = 0.04) and ceramic shade (ηP(2)-E = 0.2, ηP(2)-HV = 0.26).
Resin cement shade is an important factor influencing the mechanical properties of the material. Light shades of a resin cement express higher E and HV as well as lower Cr values compared with the darker ones.
本研究旨在评估一种光固化树脂水门汀在通过不同颜色和厚度的白榴石增强玻璃陶瓷聚合时,四种不同颜色下的微观力学性能。
本研究选用了四种不同颜色(HV+1、HV+3、LV-1和LV-3)的光固化树脂水门汀。使用LED装置(Bluephase®,义获嘉伟瓦登特公司)在两种不同颜色(A1和A3)、不同厚度(1毫米和2毫米)的白榴石增强玻璃陶瓷(IPS Empress® CAD,义获嘉伟瓦登特公司)下对样本进行20秒的固化。直接固化、无中间陶瓷层的样本作为对照。固化后的样本在37°C下用蒸馏水保持湿度条件储存24小时。使用自动显微硬度压头(德国Fisherscope H100C)测量树脂水门汀的微观力学性能(压痕模量,E;硬度,HV;蠕变,Cr)。共纳入20组(n = 3),每个样本进行10次测量。数据采用单因素方差分析和Tukey事后检验进行统计学分析,以及多变量分析以检验研究参数的影响。
在所测试的树脂水门汀的微观力学性能之间观察到显著差异(p < 0.05)。树脂水门汀的颜色对其微观力学性能影响最大(偏 eta 平方(ηP(2))-E = 0.45,ηP(2)-HV = 0.59,ηP(2)-Cr = 0.29),其次是陶瓷厚度(ηP(2)-E = 0.38,ηP(2)-HV = 0.3,ηP(2)-Cr = 0.04)和陶瓷颜色(ηP(2)-E = 0.2,ηP(2)-HV = 0.26)。
树脂水门汀的颜色是影响材料力学性能的重要因素。与深色树脂水门汀相比,浅色树脂水门汀表现出更高的E和HV值以及更低的Cr值。