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KMID : 0361920110410040268
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Korean Journal of Orthodontics
2011 Volume.41 No. 4 p.268 ~ p.279
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Influence of surface treatment on the insertion pattern of self-drilling orthodontic mini-implants
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Kim Sang-Cheol
Kim Ho-Young
Lee Sang-Jae
Kim Cheol-Moon
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Abstract
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Objective:The purpose of this study was to compare self-drilling orthodontic mini-implants of different surfaces, namely, machined (untreated), etched (acid-etched), RBM (treated with resorbable blasting media) and hybrid (RBM + machined), with respect to the following criteria: physical appearance of the surface, measurement of surface roughness, and insertion pattern.
Methods:Self-drilling orthodontic mini-implants (Osstem implant, Seoul, Korea) with the abovementioned surfaces were obtained. Surface roughness was measured by using a scanning electron microscope and surface-roughness-testing machine, and torque patterns and vertical loadings were measured during continuous insertion of mini-implants into artificial bone (polyurethane foam) by using a torque tester of the driving-motor type (speed, 12 rpm).
Results:The mini-implants with the RBM, hybrid, and acid-etched surfaces had slightly increased maximum insertion torque at the final stage (p ＜ 0.05). Implants with the RBM surface had the highest vertical load for insertion (p ＜ 0.05). Testing for surface roughness revealed that the implants with the RBM and hybrid surfaces had higher Ra values than the others (p ＜ 0.05). Scanning electron microscopy showed that the implants with the RBM surface had the roughest surface.
Conclusions:Surface-treated, self-drilling orthodontic mini-implants may be clinically acceptable, if controlled appropriately.
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KEYWORD
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Orthodontic mini-implant, RBM surface treatment, Self-drilling, Insertion pattern
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