Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Yokohama, Japan.
Department of Dental Technician Training Institute, Tsurumi University Dental Hospital, Yokohama, Japan.
J Prosthodont Res. 2020 Oct;64(4):468-477. doi: 10.1016/j.jpor.2020.01.001. Epub 2020 Feb 13.
Laboratory and clinical assessment of cast titanium dentures were reported, little is known about additive manufacturing (AM) frameworks. This study evaluated in vitro AM titanium alloy clasps for clinical use.
After scanning the stainless steel dies to simulate the first molar, an Akers clasp was designed by CAD. AM clasp specimens were manufactured using laser sintering and AM machines from CP titanium grade 2 (CPTi), Ti-6Al-4V (Ti64), and Ti-6Al-7Nb (Ti67) powders. As controls, cast titanium clasps were conventionally made with same three titanium alloys. After nondestructive inspection and surface element analysis, surface roughness, fitness accuracy, initial retentive forces, and changes in retentive forces were measured.
Although few porosities and little contamination of AM clasps were confirmed, the AM clasp arm and tip indicated slightly worse fitness accuracy as compared to cast clasps. The initial retentive forces of all titanium clasps showed appropriate retentive forces within the acceptable ranges, AM clasps tended to have lower decreases in retentive forces with up to 10,000 insertion/removal cycles as compared to those of the cast clasps.
AM titanium clasps would be acceptable for clinical use similar to that of cast titanium clasps.
报告了铸造钛义齿的实验室和临床评估情况，而对于增材制造（AM）支架知之甚少。本研究评估了用于临床的 AM 钛合金卡环。
扫描不锈钢模具以模拟第一磨牙后，通过 CAD 设计阿克（Akers）卡环。使用激光烧结和 AM 机从 CP 钛 2 级（CPTi）、Ti-6Al-4V（Ti64）和 Ti-6Al-7Nb（Ti67）粉末制造 AM 卡环标本。作为对照，用相同的三种钛合金常规制作铸造钛卡环。在进行无损检测和表面元素分析后，测量表面粗糙度、适配精度、初始固位力以及固位力的变化。
尽管 AM 卡环的孔隙率和污染较少，但 AM 卡环臂和尖端的适配精度略差于铸造卡环。所有钛卡环的初始固位力均显示出适当的固位力，在可接受的范围内，与铸造卡环相比，AM 卡环在 10,000 次插入/取出循环内的固位力下降趋势较低。
AM 钛卡环可与铸造钛卡环一样，可接受临床使用。
