Fischer Peter, Barbu Horia Mihail, Fischer Caroline Adela Ingrid, Pantea Mihaela, Baciu Florin, Vranceanu Diana Maria, Cotrut Cosmin Mihai, Spinu Tudor Claudiu
Oral Implantology Department, Titu Maiorescu University, 67A Gh. Petrascu Street, 040441 Bucharest, Romania.
Doctoral School, Faculty of Dental Medicine, Titu Maiorescu University, 67A Gh. Petrascu Street, 040441 Bucharest, Romania.
Materials (Basel). 2021 Nov 15;14(22):6887. doi: 10.3390/ma14226887.
The fabrication of fixed dental prostheses using aesthetic materials has become routine in today's dentistry. In the present study, three-unit full zirconia fixed prosthetic restorations obtained by computer-aided design/computer-aided manufacturing (CAD/CAM) technology were tested by bending trials. The prostheses were intended to replace the first mandibular left molar and were manufactured from four different types of zirconia bioceramics (KatanaTM Zirconia HTML and KatanaTM Zirconia STML/Kuraray Noritake Dental Inc.; NOVAZir Fusion float ml/NOVADENT/Dentaltechnik; and 3D PRO Zirconia/Bloomden Bioceramics). In total, sixteen samples were manufactured-four samples per zirconia material. Additionally, the morphology, grain size area distribution, and elemental composition were analyzed in parallelepiped samples made from the selected types of zirconia in three different areas, noted as the upper, middle, and lower areas. The scanning electron microscope (SEM) analysis highlighted that the grain size area varies with respect to the researched area and the type of material. Defects such as microcracks and pores were also noted to a smaller extent. In terms of grain size area, it was observed that most of the particles in all samples were under 0.5 μm, while the chemical composition of the investigated materials did not vary significantly. The results obtained after performing the bending tests showed that a zirconia material with fewer structural defects and an increased percentage of grain size area under 0.5 µm, ranging from ~44% in the upper area to ~74% in the lower area, exhibited enhanced mechanical behavior. Overall, the resulting values of all investigated parameters confirm that the tested materials are suitable for clinical use.
在当今牙科领域，使用美学材料制作固定义齿已成为常规操作。在本研究中，通过计算机辅助设计/计算机辅助制造（CAD/CAM）技术获得的三单位全锆固定修复体进行了弯曲试验。这些修复体旨在替代下颌左侧第一磨牙，由四种不同类型的氧化锆生物陶瓷制成（KatanaTM Zirconia HTML和KatanaTM Zirconia STML/可乐丽诺瑞特牙科公司；NOVAZir Fusion float ml/NOVADENT/牙科技术公司；以及3D PRO Zirconia/布鲁姆登生物陶瓷公司）。总共制作了16个样本，每种氧化锆材料4个样本。此外，对从选定类型的氧化锆制成的平行六面体样本在三个不同区域（分别标记为上部、中部和下部区域）进行了形态学、晶粒尺寸面积分布和元素组成分析。扫描电子显微镜（SEM）分析突出显示，晶粒尺寸面积随研究区域和材料类型而变化。还在较小程度上观察到微裂纹和孔隙等缺陷。在晶粒尺寸面积方面，观察到所有样本中的大多数颗粒都小于0.5μm，而所研究材料的化学成分没有显著变化。进行弯曲试验后获得的结果表明，一种结构缺陷较少且小于0.5μm的晶粒尺寸面积百分比增加的氧化锆材料，在上部区域从约44%到下部区域约74%，表现出增强的力学性能。总体而言，所有研究参数的结果证实所测试的材料适用于临床使用。
