Department of Oral Implantology, Discipline of Dental Materials, Faculty of Dental Medicine, University of Medicine and Pharmacy "Grigore T. Popa", 700115 Iași, Romania.
Department of Surgery, Discipline of Pediatric Dentistry, Faculty of Dental Medicine, University of Medicine and Pharmacy "Grigore T. Popa", 700115 Iași, Romania.
Medicina (Kaunas). 2023 May 28;59(6):1042. doi: 10.3390/medicina59061042.
: Acrylic resins remain the materials of choice for removable prosthesis due to their indisputable qualities. The continuous evolution in the field of dental materials offers practitioners today a multitude of therapeutic options. With the development of digital technologies, including both subtractive and additive methods, workflow has been considerably reduced and the precision of prosthetic devices has increased. The superiority of prostheses made by digital methods compared to conventional prostheses is much debated in the literature. Our study's objective was to compare the mechanical and surface properties of three types of resins used in conventional, subtractive, and additive technologies and to determine the optimal material and the most appropriate technology to obtain removable dentures with the highest mechanical longevity over time. : For the mechanical tests, 90 samples were fabricated using the conventional method (heat curing), CAD/CAM milling, and 3D printing technology. The samples were analyzed for hardness, roughness, and tensile tests, and the data were statistically compared using Stata 16.1 software (StataCorp, College Station, TX, USA). A finite element method was used to show the behavior of the experimental samples in terms of the crack shape and its direction of propagation. For this assessment the materials had to be designed inside simulation software that has similar mechanical properties to those used for obtaining specimens for tensile tests. : The results of this study suggested that CAD/CAM milled samples showed superior surface characteristics and mechanical properties, comparable with conventional heat-cured resin samples. The propagation direction predicted by the finite element analysis (FEA) software was similar to that observed in a real-life specimen subjected to a tensile test. : Removable dentures made from heat-cured resins remain a clinically acceptable option due to their surface quality, mechanical properties, and affordability. Three-dimensional printing technology can be successfully used as a provisional or emergency therapeutic solution. CAD/CAM milled resins exhibit the best mechanical properties with great surface finishes compared to the other two processing methods.
: 由于其无可争议的品质，丙烯酸树脂仍然是可摘义齿的首选材料。口腔材料领域的不断发展为今天的从业者提供了多种治疗选择。随着数字技术的发展，包括减法和加法方法，工作流程大大缩短，修复体的精度也提高了。与传统义齿相比，数字方法制作的义齿的优越性在文献中备受争议。我们的研究目的是比较传统、减法和加法技术中使用的三种类型的树脂的机械和表面性能，并确定最佳材料和最合适的技术，以获得随时间推移具有最高机械寿命的可摘义齿。: 对于机械测试，使用传统方法（热固化）、CAD/CAM 铣削和 3D 打印技术制造了 90 个样本。对样本进行硬度、粗糙度和拉伸测试分析，并使用 Stata 16.1 软件（StataCorp，College Station，TX，USA）对数据进行统计比较。使用有限元方法显示实验样本在裂纹形状及其扩展方向方面的行为。为此评估，必须在模拟软件中设计材料，该软件具有与用于获得拉伸试验样本的材料相似的机械性能。: 这项研究的结果表明，CAD/CAM 铣削的样本显示出优越的表面特性和机械性能，与传统的热固化树脂样本相当。有限元分析（FEA）软件预测的传播方向与在实际拉伸试验中观察到的样本相似。: 由于其表面质量、机械性能和可负担性，热固化树脂制成的可摘义齿仍然是一种临床可接受的选择。三维打印技术可以成功用作临时或紧急治疗解决方案。与其他两种加工方法相比，CAD/CAM 铣削的树脂具有最佳的机械性能和出色的表面光洁度。
