Abad-Coronel Cristian, Ruano Espinosa Carolina, Ordóñez Palacios Sofía, Paltán César A, Fajardo Jorge I
CAD/CAM Materials and Digital Dentistry Research Group, Faculty of Dentistry, Universidad de Cuenca, Cuenca 010204, Ecuador.
Faculty of Dentistry, Universidad de Cuenca, Cuenca 010204, Ecuador.
Materials (Basel). 2023 Sep 19;16(18):6269. doi: 10.3390/ma16186269.
The development of digital technologies has allowed for the fabrication of new materials; however, it makes it difficult to choose the best methods to obtain occlusal splints with optimal properties, so it is essential to evaluate the effectiveness of these materials. The aim of the study is to compare the fracture resistance of occlusal splints made of different materials after thermo-mechanical aging.
A total of 32 samples were made from 4 materials (two 3D printed polymeric materials, a PMMA disc for CAD/CAM, and a conventional heat-cured acrylic resin); subsequently, the fracture test was performed using the load compression mode applied occlusally on the splint surface.
Four statistical tests were used (Shapiro-Wilk, Levene's test, ANOVA, and Tukey's HSD test).
The following study showed that there are differences in fracture strength among the four materials investigated, where the highest strength was observed in the milled splint, with a mean of 3051.2 N (newton) compared to the strength of the flexible splint with 1943.4 N, the printed splint with 1489.9 N, and the conventional acrylic splint with 1303.9 N.
The milled splints were the most resistant to fracture. Of the printed splints, the splint made with flexural rigid resin withstood the applied forces in acceptable ranges, so its clinical indication may be viable. Although the results of this research indicated differences in the mechanical properties between the CAD/CAM and conventional fabrication methods, the selection may also be influenced by processing time and cost, since with a CAD/CAM system there is a significant reduction in the production time of the splint material.
数字技术的发展使得新型材料的制造成为可能；然而，这也使得选择获得具有最佳性能的咬合板的最佳方法变得困难，因此评估这些材料的有效性至关重要。本研究的目的是比较不同材料制成的咬合板在热机械老化后的抗断裂性。
用4种材料制作了共32个样本（两种3D打印聚合材料、一个用于CAD/CAM的PMMA盘以及一种传统热固化丙烯酸树脂）；随后，采用在夹板表面咬合施加的载荷压缩模式进行断裂试验。
使用了四种统计检验（夏皮罗-威尔克检验、莱文检验、方差分析和图基HSD检验）。
以下研究表明，在所研究的四种材料中，断裂强度存在差异，其中铣削夹板的强度最高，平均值为3051.2牛顿（N），而柔性夹板的强度为1943.4 N，打印夹板的强度为1489.9 N，传统丙烯酸夹板的强度为1303.9 N。
铣削夹板最抗断裂。在打印夹板中，由抗弯刚性树脂制成的夹板在可接受范围内承受了施加的力，因此其临床应用可能可行。尽管本研究结果表明CAD/CAM与传统制作方法在机械性能方面存在差异，但选择还可能受加工时间和成本的影响，因为使用CAD/CAM系统可显著减少夹板材料的生产时间。
