Gibreel Mona, Perea-Lowery Leila, Vallittu Pekka K, Garoushi Sufyan, Lassila Lippo
Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku.
City of Turku, Welfare Division.
Dent Mater J. 2022 Nov 30;41(6):916-922. doi: 10.4012/dmj.2022-100. Epub 2022 Oct 27.
The aim of this in vitro study was to evaluate the wear and surface hardness of nine materials for conventional manufacturing, subtractive milling, and 3D printing of occlusal splints, as well as to evaluate the differences in wear and surface hardness between rigid and flexible 3D-printed occlusal splint materials. Two-body wear and Vickers hardness tests were performed. The vertical wear depth and Vickers hardness values were statistically analyzed. Vertical wear depth and surface hardness values were statistically significant among the investigated materials (p<0.05). The lowest vertical wear depth was observed for the heat-cured resin (27.5±2.4 μm), PMMA-based milled material (30.5±2.8 μm), and autopolymerizing resin (36.7±6.3 μm), with no statistical difference (p<0.05). Flexible 3D-printed and CAD-CAM milled polycarbonate-based splint materials displayed lower surface hardness and higher wear than the PMMA-based materials. PMMA-based splint materials displayed the most consistent surface hardness and wear resistance regardless of the manufacturing technology.
本体外研究的目的是评估用于传统制造、减法铣削和3D打印咬合板的九种材料的磨损和表面硬度，以及评估刚性和柔性3D打印咬合板材料在磨损和表面硬度方面的差异。进行了双体磨损和维氏硬度测试。对垂直磨损深度和维氏硬度值进行了统计分析。在研究的材料中，垂直磨损深度和表面硬度值具有统计学意义（p<0.05）。热固化树脂（27.5±2.4μm）、基于PMMA的铣削材料（30.5±2.8μm）和自凝树脂（36.7±6.3μm）的垂直磨损深度最低，无统计学差异（p<0.05）。与基于PMMA的材料相比，柔性3D打印和CAD-CAM铣削的基于聚碳酸酯的夹板材料显示出较低的表面硬度和较高的磨损。无论制造技术如何，基于PMMA的夹板材料显示出最一致的表面硬度和耐磨性。
