Insertion torque, resonance frequency, and removal torque analysis of microimplants

Kaohsiung Journal of Medical Sciences

卷:32

Ju-Hui Wu¹  Hong-Sen Chen¹  Chun-Ming Chen²  Yu-Chuan Tseng²  Chun-Chan Ting²  Je-Kang Du² 

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

[2] School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan;

关键词: Insertion torque;    Orthodontic microimplant;    Removal torque;    Resonance frequency;   

DOI  :  10.1016/j.kjms.2016.07.007

来源: DOAJ

【 摘 要 】

This study aimed to compare the insertion torque (IT), resonance frequency (RF), and removal torque (RT) among three microimplant brands. Thirty microimplants of the three brands were used as follows: Type A (titanium alloy, 1.5-mm × 8-mm), Type B (stainless steel, 1.5-mm × 8-mm), and Type C (titanium alloy, 1.5-mm × 9-mm). A synthetic bone with a 2-mm cortical bone and bone marrow was used. Each microimplant was inserted into the synthetic bone, without predrilling, to a 7 mm depth. The IT, RF, and RT were measured in both vertical and horizontal directions. One-way analysis of variance and Spearman's rank correlation coefficient tests were used for intergroup and intragroup comparisons, respectively. In the vertical test, the ITs of Type C (7.8 Ncm) and Type B (7.5 Ncm) were significantly higher than that of Type A (4.4 Ncm). The RFs of Type C (11.5 kHz) and Type A (10.2 kHz) were significantly higher than that of Type B (7.5 kHz). Type C (7.4 Ncm) and Type B (7.3 Ncm) had significantly higher RTs than did Type A (4.1 Ncm). In the horizontal test, both the ITs and RTs were significantly higher for Type C, compared with Type A. No significant differences were found among the groups, and the study hypothesis was accepted. Type A had the lowest inner/outer diameter ratio and widest apical facing angle, engendering the lowest IT and highest RF values. However, no significant correlations in the IT, RF, and RT were observed among the three groups.

【 授权许可】

Unknown