Relationship between the angulation of temporary anchoring devices and their displacement. Experimental study
Keywords:
mini-implant, anchorage, stabilityAbstract
The purpose of this study is to assess how the insertion angle influence the stability mini-implant when loaded with 200 cNe in this study, 2 mini-screws were implanted in male rabbits’ (n=25) tibia in a 6 weeks interval between the first one and the second one. The second mini-implants were placed at different angles with respect to the cortical bone: -20° in the direction of the force e (Group I), perpendicular to the force (Group II) and 30° in the opposite direction of the force (Group III). These experimental implants were immediately loaded (right tibias). The Tad`s on the left tibias were regarded as control. The animals were sacrificed six weeks after the first surgery. Linear distances between the two Tad`s were measured with a digital caliper at the time of placement, and after the sacrifice, then were compared. The displacements were: Group I, 2.96 mm ±1.05; Group II, 0.27 mm ±0.36; and Group III, 0.29 mm ±0.26. The controls remained. The values for the micro-implants of Group I showed statistically significant differences (p≤0.05) compared to Groups II y III. Based on these data, we can conclude that mini-implants inclined towards the direction of the force applied induce more displacement than the ones placed perpendicular to the force or in the opposite direction of the force.
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