Effect of Different Surface Designs on the Rotational Resistance and Stability of Orthodontic Miniscrews: A Three-Dimensional Finite Element Study

Sensors

SongHee Oh¹  Seong-Hun Kim²  Kyu-Rhim Chung²  Jin-Young Choi²  Jaehee Cho³  Gerald Nelson⁴ 

[1] Department of Oral and Maxillofacial Radiology, Graduate School of Dentistry, Kyung Hee University, Seoul 02447, Korea;Department of Orthodontics, Graduate School of Dentistry, Kyung Hee University, Seoul 02447, Korea;Department of Orthodontics, Graduate School of Medicine, Korea University, Seoul 02841, Korea;Division of Orthodontics, Department of Orofacial Science, University of California, San Francisco, CA 94143, USA;

关键词: implant;    macrostructural modification;    osseointegration;    surface treatment;   

DOI  :  10.3390/s21061964

来源: DOAJ

【 摘 要 】

High orthodontic forces and various directions of applied forces can be associated with loosening of the screw anchorage in the bone. Screw designs have been modified to increase the stability of the miniscrews. This research evaluates the influence of three-designs on the stability of orthodontic miniscrews. A conventionally cylinder-type miniscrew design (Bio-Action screw, Jin-Biomed co., Bucheon, Korea) was set as a control, and three conditions were studied based on modifications of this control design. Condition-1 has narrowed threads in the upper part of the screw; Condition-2 has a notch at the middle part; and Condition-3 has the combination of Condition-1 and Condition-2. The moment required to unwind the miniscrew to five degrees is tested, and the moment generated at the cortical bone and the trabecular bone were calculated with finite element analysis. Compared to the control, all three conditions showed a higher moment required to unwind the miniscrew and a higher moment generated at the cortical bone. At the trabecular bone, condition-2 and -3 showed higher moment than the control, and condition-1 showed similar moment to the control. Condition-3 required a higher overall moment to unwind the miniscrew. These findings validate the design modifications used to increase the rotational resistance.

【 授权许可】

Unknown