Abad-Coronel Cristian, Calle Carolina, Abril Gabriela, Paltán César A, Fajardo Jorge I
CAD/CAM Materials and Digital Dentistry Research Group, Faculty of Dentistry, Universidad de Cuenca, Cuenca 010107, Ecuador.
Faculty of Dentistry, Universidad de Cuenca, Cuenca 010101, Ecuador.
Polymers (Basel). 2023 Apr 1;15(7):1761. doi: 10.3390/polym15071761.
The aim of this study was to evaluate and compare the fracture resistance of temporary restorations made of polymethylmethacrylate (PMMA), graphene-modified PMMA (GRA), acetal resin (AR) and polysulfone (PS) obtained by a subtractive technique (milling) using a computer-aided design and manufacturing (CAD/CAM) system of a three-unit fixed dental prosthesis (FDP).
Four groups of ten samples were fabricated for each material. Each specimen was characterized by a compression test on a universal testing machine, all specimens were loaded to fracture and the value in Newtons (N) was recorded by software connected to the testing machine. The fracture mode was evaluated on all samples using a stereomicroscope.
There were statistically significant differences ( value < 0.005) between PMMA and the other three materials (PMMA: 1302.71 N; GRA: 1990.02 N; RA: 1796.20 N; PS: 2234.97). PMMA presented a significantly lower value than the other materials, and PS showed the highest value. GRA and RA presented a similar range of values but they were still higher than those of PMMA.
GRA, RA and PS are presented as valid options within the range of interim milled restorative materials and as alternatives to PMMA.
本研究的目的是评估和比较通过减材技术（铣削）使用计算机辅助设计和制造（CAD/CAM）系统制作的三单位固定义齿（FDP）的临时修复体的抗折强度，这些临时修复体由聚甲基丙烯酸甲酯（PMMA）、石墨烯改性聚甲基丙烯酸甲酯（GRA）、乙缩醛树脂（AR）和聚砜（PS）制成。
每种材料制作四组，每组十个样本。每个样本在万能试验机上进行压缩试验，所有样本加载至断裂，通过连接到试验机的软件记录牛顿（N）值。使用体视显微镜评估所有样本的断裂模式。
PMMA与其他三种材料之间存在统计学显著差异（ 值<0.005）（PMMA：1302.71 N；GRA：1990.02 N；RA：1796.20 N；PS：2234.97）。PMMA的值显著低于其他材料，PS的值最高。GRA和RA的值范围相似，但仍高于PMMA。
在临时铣削修复材料范围内，GRA、RA和PS是有效的选择，可作为PMMA的替代品。
