Int J Prosthodont. 2024 Feb 21;37(7):5-11. doi: 10.11607/ijp.8376.
The purpose of this study was to investigate the mechanical properties of acrylic resins at different aging times for denture bases manufactured using the conventional method, microwave processing, milling, and 3D printing.
A total of 160 rectangular samples (64 Å~ 10 Å~ 3.3 ± 0.03 mm) were prepared, divided among the four main resin groups, and subdivided into four analysis times (T0, T1, T2, and T3), resulting in 10 samples per subgroup. The samples were stored in distilled water at 37° ± 2°C for 24 hours (T0), then subjected to thermocycling at temperatures of 5° ± 1°C and 55° ± 1°C in different numbers of cycles: 5,000 (T1); 10,000 (T2); and 20,000 (T3). The mechanical properties evaluated were surface microhardness, flexural strength, and modulus of elasticity. Statistical differences between resin groups and aging time were evaluated using two-way analysis of variance (P < .05).
The 3D-printed resin showed the significantly lowest values of microhardness, flexural strength, and modulus of elasticity compared to other resins (P < .001).
The CAD/CAM-milled denture resin showed mechanical properties similar to those of traditional resins (conventional and microwave-processed). The 3D-printing resin did not show adequate mechanical properties for long-term clinical use. Despite this, new studies are developing better properties of this resin for long-term use.
本研究旨在探讨不同老化时间下常规法、微波处理、铣削和 3D 打印制作义齿基托用丙烯酸树脂的力学性能。
共制备 160 个矩形样本（64 Å~ 10 Å~ 3.3 ± 0.03mm），分为 4 个主要树脂组，再细分为 4 个分析时间（T0、T1、T2 和 T3），每组亚组各有 10 个样本。样本在 37°C ± 2°C 的蒸馏水中储存 24 小时（T0），然后在不同循环数的 5°C ± 1°C 和 55°C ± 1°C 下进行热循环：5000 次（T1）；10000 次（T2）；20000 次（T3）。评估的力学性能包括表面显微硬度、弯曲强度和弹性模量。使用双向方差分析（P <.05）评估树脂组和老化时间之间的统计学差异。
与其他树脂相比，3D 打印树脂的显微硬度、弯曲强度和弹性模量值显著较低（P <.001）。
CAD/CAM 铣削义齿树脂的机械性能与传统树脂（常规和微波处理）相似。3D 打印树脂的机械性能不适合长期临床使用。尽管如此，新的研究正在开发这种树脂的更好的长期使用性能。
