Effects of repetitive insertion/removal and occlusal load on the retentive force of rest plate-I bar clasps made by selective laser melting.

IF 1.9 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE Dental materials journal Pub Date : 2024-11-09 DOI:10.4012/dmj.2024-271

Yuki Uekubo, Yoshimitsu Kato, Keita Tomono, Mitsuo Kato, Juro Wadachi, Shinji Takemoto, Shuichiro Yamashita

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Abstract

The objective of this study was to investigate the effects of repetitive removal/insertion and a load equivalent to the occlusal force on the retentive force of rest plate-I bar (RPI) clasps fabricated by selective laser melting (SLM) on powder bed fusion. RPI clasp fabricated by SLM and casting were evaluated to the retentive force by repetitive removal/insertion (SLM-RI and Cast-RI), and the retentive force of RPI clasp by SLM was also evaluated by repetitive removal/insertion under load (SLM-L). SLM-RI group was kept superior retentive force during repetitive removal/insertion than Cast-RI group. SLM-L group showed the decrease of retentive force, and all specimens fractured during less than 7,000 repetitive removal/insertion. In SLM-L, the fracture of RPI clasp occurred at minor connector due to stress concentration. In conclusion, the RPI clasp by SLM demonstrated the superior retentive force and fitting for repetitive removal/insertion, yet improvements were necessary to withstand a load equivalent to occlusal force.

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选择性激光熔化法制作的托板 I 型杆卡扣的重复插入/拔出和咬合负荷对其固位力的影响。

本研究的目的是探讨重复去除/插入和相当于咬合力的载荷对粉末床熔融上选择性激光熔化（SLM）制造的托板-I杆（RPI）扣的保持力的影响。采用 SLM 和铸造法制造的 RPI 扣通过重复取出/插入（SLM-RI 和 Cast-RI）对固位力进行了评估，采用 SLM 制造的 RPI 扣还通过在负载下重复取出/插入（SLM-L）对固位力进行了评估。与 Cast-RI 组相比，SLM-RI 组在重复取出/插入过程中保持了更高的牵引力。SLM-L 组的保持力有所下降，所有试样在少于 7000 次重复取出/插入过程中均发生断裂。在 SLM-L 组中，由于应力集中，RPI 扣的断裂发生在次要接头处。总之，采用 SLM 技术的 RPI 扣在重复摘戴/插入时表现出更优越的固位力和贴合性，但要承受与咬合力相当的负荷，还需要进行改进。

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来源期刊

Dental materials journal 医学-材料科学：生物材料

CiteScore

4.60

自引率

4.00%

发文量

102

审稿时长

3 months

期刊介绍： Dental Materials Journal is a peer review journal published by the Japanese Society for Dental Materials and Devises aiming to introduce the progress of the basic and applied sciences in dental materials and biomaterials. The dental materials-related clinical science and instrumental technologies are also within the scope of this journal. The materials dealt include synthetic polymers, ceramics, metals and tissue-derived biomaterials. Forefront dental materials and biomaterials used in developing filed, such as tissue engineering, bioengineering and artificial intelligence, are positively considered for the review as well. Recent acceptance rate of the submitted manuscript in the journal is around 30%.