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KMID : 0361920120420010004
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Korean Journal of Orthodontics
2012 Volume.42 No. 1 p.4 ~ p.10
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Effect of surface anodization on stability of orthodontic microimplant
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Karmarker Sanket
Yu Won-Jae
Kyung Hee-Moon
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Abstract
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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). Th e peak insertion torque (PIT) and the peak removal torque (PRT) values were measured for the 2 groups of MIs. Th ese values were then used to calculate the interfacial shear strength between the MI and cortical bone.
Results: Th ere were no statistical differences in terms of PIT between the 2 groups. However, mean PRT was signifi cantly greater for the anodized implants (3.79 ± 1.39 Ncm) than for the machined ones (2.05 ± 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.
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KEYWORD
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Orthodontic microimplant, Anodization, Self drilling, Interfacial shear strength
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