选择性激光熔融与铸造钛合金卡环的模拟摘戴固位力研究

ObjectiveThis study aimed to determine the effects of 3D printing and casting on the retention force of titanium-alloy clasps by simulating clasp removal and wear by patients to provide a reference for the clinical design and manufacture of clasps.MethodsPreparatory abutment teeth, crowns, and clasps were designed through computer-aided design. The clasps were designed with two undercut depths of 0.25 and 0.75 mm while the other parameters were held constant. The processing technology was divided into three groups. The experimental group used EOSINT and Concept Laser to 3D print the designed data, whereas the control group used casting technology. A total of 36 groups were set. A universal mechanical tester was used to simulate the cycle test of the clasps with a total cycle of 15 000 times. The initial retention force was recorded, and the retention force was recorded every 1 500 times.ResultsBy using the same processing technology, the retention force of the undercut depth of 0.75 mm was greater than that of 0.25 mm. The retention force of the titanium-alloy clasp formed through selective laser melting (SLM) with the same parameters was greater than that of the clasps fabricated through casting. EOSINT and Concept Laser did not have different retentive forces.ConclusionThe retention force of the titanium alloy clasp produced through SLM technology was higher than that of the clasp fabricated through casting. The undercut depth of titanium-alloy clasps machined by casting should be 0.75 mm. Titanium-alloy clasps that can meet clinical requirements can be produced through using digital design, 3D printing, and an undercut depth of 0.25 mm. The retention forces of titanium-alloy clasps fabricated through EOSINT and Concept Laser SLM systems were the same.