PhD Student, School of Dental Medicine, University of Zagreb, Zagreb, Croatia.
Full Professor, Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia.
J Prosthodont. 2020 Jul;29(6):524-528. doi: 10.1111/jopr.13175. Epub 2020 Apr 20.
To evaluate and compare the mechanical properties (flexural strength and surface hardness) of different materials and technologies for denture base fabrication. The study emphasized the digital technologies of computer-aided design/computer-aided manufacturing (CAD/CAM) and three-dimensional (3D) printing.
A total of 160 rectangular specimens were fabricated from three conventional heat-polymerized (ProBase Hot, Paladon 65, and Interacryl Hot), three CAD/CAM produced (IvoBase CAD, Interdent CC disc PMMA, and Polident CAD/CAM disc), one 3D-printed (NextDent Base), and one polyamide material (Vertex ThermoSens) for denture base fabrication. The flexural strength test was the three-point flexure test, while hardness testing was conducted using the Brinell method. The data were analyzed using descriptive and analytical statistics (α = 0.05).
During flexural testing, the IvoBase CAD and Vertex ThermoSens specimens did not fracture during loading. The flexural strength values of the other groups ranged from 71.7 ± 7.4 MPa to 111.9 ± 4.3 MPa. The surface hardness values ranged from 67.13 ± 10.64 MPa to 145.66 ± 2.22 MPa. There were significant differences between the tested materials for both flexural strength and surface hardness. There were also differences between some materials with the same polymerization type. CAD/CAM and polyamide materials had the highest flexural strength values. Two groups of CAD/CAM materials had the highest surface hardness values, while a third, along with the polyamide material, had the lowest. The 3D-printed materials had the lowest flexural strength values.
Generally, CAD/CAM materials show better mechanical properties than heat-polymerized and 3D-printed acrylics do. Nevertheless, a material's polymerization type is no guarantee of its optimal mechanical properties.
评估和比较不同材料和技术制作义齿基托的机械性能（弯曲强度和表面硬度）。本研究强调了计算机辅助设计/计算机辅助制造（CAD/CAM）和三维（3D）打印的数字技术。
共制作了 160 个矩形试件，分别来自三种常规热聚合材料（ProBase Hot、Paladon 65 和 Interacryl Hot）、三种 CAD/CAM 制作材料（IvoBase CAD、Interdent CC 盘 PMMA 和 Polident CAD/CAM 盘）、一种 3D 打印材料（NextDent Base）和一种聚酰胺材料（Vertex ThermoSens）。弯曲强度测试采用三点弯曲测试，硬度测试采用布氏硬度法。使用描述性和分析性统计（α=0.05）对数据进行分析。
在弯曲测试中，IvoBase CAD 和 Vertex ThermoSens 试件在加载过程中没有断裂。其他组的弯曲强度值范围为 71.7±7.4 MPa 至 111.9±4.3 MPa。表面硬度值范围为 67.13±10.64 MPa 至 145.66±2.22 MPa。两种聚合类型的材料在弯曲强度和表面硬度方面均存在显著差异。同一聚合类型的材料之间也存在差异。CAD/CAM 和聚酰胺材料具有最高的弯曲强度值。两组 CAD/CAM 材料具有最高的表面硬度值，而第三组和聚酰胺材料具有最低的表面硬度值。3D 打印材料的弯曲强度值最低。
总体而言，CAD/CAM 材料的机械性能优于热聚合和 3D 打印丙烯酸材料。然而，材料的聚合类型并不能保证其具有最佳的机械性能。
