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http://dx.doi.org/10.4041/kjod.2012.42.1.4

Effect of surface anodization on stability of orthodontic microimplant  

Karmarker, Sanket (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Yu, Won-Jae (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Kyung, Hee-Moon (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Publication Information
The korean journal of orthodontics / v.42, no.1, 2012 , pp. 4-10 More about this Journal
Abstract
Objective: To determine the effect of surface anodization on the interfacial strength between an orthodontic microimplant (MI) and the rabbit tibial bone, particularly in the initial phase aft er placement. Methods: A total of 36 MIs were driven into the tibias of 3 mature rabbits by using the self-drilling method and then removed aft er 6 weeks. Half the MIs were as-machined (n = 18; machined group), while the remaining had anodized surfaces (n = 18; anodized group). The peak insertion torque (PIT) and the peak removal torque (PRT) values were measured for the 2 groups of MIs. These values were then used to calculate the interfacial shear strength between the MI and cortical bone. Results: There were no statistical differences in terms of PIT between the 2 groups. However, mean PRT was significantly greater for the anodized implants ($3.79{\pm}1.39$ Ncm) than for the machined ones ($2.05{\pm}1.07$ Ncm) (p < 0.01). The interfacial strengths, converted from PRT, were calculated at 10.6 MPa and 5.74 MPa for the anodized and machined group implants, respectively. Conclusions: Anodization of orthodontic MIs may enhance their early-phase retention capability, thereby ensuring a more reliable source of absolute anchorage.
Keywords
Orthodontic microimplant; Anodization; Self drilling; Interfacial shear strength;
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