Department of Orthodontics, Nihon University School of Dentistry.
Section of Orthodontics, Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo.
J Oral Sci. 2024 Apr 16;66(2):107-110. doi: 10.2334/josnusd.23-0303. Epub 2024 Feb 23.
To investigate the elemental composition, corrosion resistance, and mechanical properties of computer-aided design and computer-aided manufacturing (CAD-CAM) retainers versus conventional fixed retainers (FRs).
Eight different retainer wires were investigated. Energy dispersive X-ray spectroscopy was used to determine the elemental composition. Leakage was analysed according to ISO 10271:2020 guidelines. Hardness was tested using the Vickers method with a load of 0.3 kg. The tensile force and tensile strength were evaluated. Multiple comparisons among wires of hardness, tensile force, and strength were conducted using the Welch t-test, with Bonferroni correction.
Nickel was present in all wires. The CAD-CAM-FR wire, which contained more nickel than the other wires, had no measurable leakage. The gold-plated wires had the highest total leakage, but did not exceed the ISO standard limit. The hardness of the stainless-steel twisted wires was the highest and that of the CAD-CAM-FR wire was the lowest. The tensile strength of the CAD-CAM-FR wire was significantly lower than that of the other wires and similar to the other twisted-wire retainers.
The CAD-CAM-FR wire is likely to have high corrosion resistance and flexibility due to its low hardness.
研究计算机辅助设计和计算机辅助制造（CAD-CAM）保持器与传统固定保持器（FRs）的元素组成、耐腐蚀性和机械性能。
研究了 8 种不同的保持器丝。使用能量色散 X 射线光谱法确定元素组成。根据 ISO 10271:2020 指南分析泄漏。使用 0.3kg 负载的维氏方法测试硬度。评估拉伸力和拉伸强度。使用 Welch t 检验和 Bonferroni 校正对硬度、拉伸力和强度的丝进行多组比较。
所有丝中均含有镍。CAD-CAM-FR 丝的镍含量高于其他丝，无可测量的泄漏。镀金丝的总泄漏量最高，但未超过 ISO 标准限值。不锈钢扭丝的硬度最高，CAD-CAM-FR 丝的硬度最低。CAD-CAM-FR 丝的拉伸强度明显低于其他丝，与其他扭丝保持器相似。
由于 CAD-CAM-FR 丝的硬度低，因此其耐腐蚀性和柔韧性可能较高。
