Tavares L N, Ferraz D C, Dolenkei K K, Zancopé K, Almeida Silva A C, Raposo L H
Lucas do Nascimento Tavares, DDS, MSc, PhD, School of Dentistry, Federal University of Uberlândia, MG, Brazil.
Danilo Cassiano Ferraz, DDS, MSc, PhD, School of Dentistry, Federal University of Uberlândia, MG, Brazil.
Oper Dent. 2025 May 1;50(3):333-344. doi: 10.2341/24-133-L.
This study compared four CAD/CAM lithium disilicate-reinforced glass ceramic systems (IPS e.max CAD, Rosetta SM CAD, T-lithium CAD, and IRIS CAD) regarding their crystalline and microstructural characteristics, thermal properties, mechanical strength, and bonding to a resin cement.
The crystalline and morphological characteristics of the ceramic microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), thermal behavior was assessed via differential thermal analysis (DTA). Mechanical properties were evaluated using a biaxial flexural strength test, and bonding to a resin cement was measured with a microshear strength test at distinct storage times. Data were evaluated using analysis of variance and Tukey HSD tests (α = 0.05).
High peak positions corresponding to standard lithium metasilicate and lithium disilicate with similar intensities were observed for all ceramics in the XRD analysis. SEM morphological analysis showed differences in crystal characteristics among the ceramics after HF etching. The DTA thermograms showed a crystallization process ranging from 812-872°C among the different ceramic systems. The IRIS system showed the lowest flexural strength values, while bond strengths to resin cement remained comparable among materials, regardless of storage time.
Most lithium disilicate ceramic systems demonstrated acceptable characteristics in the tests performed, except for IRIS, which showed shortcomings in crystal morphology and mechanical strength, along with inconsistent thermal behavior. These findings underscore the importance of careful material selection to ensure durable dental restorations.
本研究比较了四种计算机辅助设计/计算机辅助制造（CAD/CAM）锂二硅酸盐增强玻璃陶瓷系统（IPS e.max CAD、Rosetta SM CAD、T-锂CAD和IRIS CAD）的晶体和微观结构特征、热性能、机械强度以及与树脂水门汀的粘结情况。
通过X射线衍射（XRD）和扫描电子显微镜（SEM）研究陶瓷微观结构的晶体和形态特征，通过差示热分析（DTA）评估热行为。使用双轴弯曲强度试验评估机械性能，并在不同储存时间通过微剪切强度试验测量与树脂水门汀的粘结情况。数据采用方差分析和Tukey HSD检验进行评估（α = 0.05）。
XRD分析中，所有陶瓷均观察到与标准偏硅酸锂和锂二硅酸盐相对应的高强度峰位。SEM形态分析显示，氢氟酸蚀刻后陶瓷的晶体特征存在差异。DTA热重曲线显示，不同陶瓷系统的结晶过程温度范围为812 - 872°C。IRIS系统的弯曲强度值最低，而不同材料与树脂水门汀的粘结强度在不同储存时间下保持相当。
除IRIS外，大多数锂二硅酸盐陶瓷系统在测试中表现出可接受的特性，IRIS在晶体形态和机械强度方面存在不足，热行为也不一致。这些发现强调了谨慎选择材料以确保持久牙科修复体的重要性。
