Evaluation of mechanical strengths of three types of mini-implants in artificial bones

Kaohsiung Journal of Medical Sciences

Ju-Hui Wu¹  Hong-Sen Chen¹  Chun-Ming Chen²  Yu-Chuan Tseng²  Chun-Chan Ting² 

[1] Faculty of Oral Hygiene, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan;School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan;

关键词: Anchor area;    Infrazygomatic mini-implant;    Insertion torque;    Removal torque;    Resonance frequency;   

DOI  :  10.1016/j.kjms.2016.11.001

来源: DOAJ

【 摘 要 】

We investigates the effect of the anchor area on the mechanical strengths of infrazygomatic mini-implants. Thirty mini-implants were divided into three types based on the material and shape: Type A (titanium alloy, 2.0×12 mm), Type B (stainless steel, 2.0×12 mm), and Type C (titanium alloy, 2.0×11 mm).The mini-implants were inserted at 90° and 45° into the artificial bone to a depth of 7 mm, without predrilling. The mechanical strengths [insertion torque (IT), resonance frequency (RF), and removal torque (RT)] and the anchor area were measured. We hypothesized that no correlation exists among the mechanical forces of each brand. In the 90° tests, the IT, RF, and RT of Type C (8.5 N cm, 10.2 kHz, and 6.1 N cm, respectively) were significantly higher than those of Type A (5.0 N cm, 7.7 kHz, and 4.7 N cm, respectively). In the 45° test, the RFs of Type C (9.2 kHz) was significantly higher than those of Type A (7.0 kHz) and Type B (6.7 kHz). The anchor area of the mini-implants was in the order of Type C (706 mm2)>Type B (648 mm2)>Type A (621 mm2). Type C exhibited no significant correlation in intragroup comparisons, and the hypothesis was accepted. In the 90° and 45° tests, Type C exhibited the largest anchor area and the highest mechanical strengths (IT, RF, and RT) among the three types of mini-implants. The anchor area plays a crucial role in the mechanical strength of mini-implants.

【 授权许可】

Unknown