Journal Article

Bone response to orthodontic loading of endosseous implants in the rabbit calvaria: early continuous distalizing forces

Z Majzoub, M Finotti, F Miotti, R Giardino, NN Aldini and G Cordioli

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 21, issue 3, pages 223-230
Published in print June 1999 | ISSN: 0141-5387
Published online June 1999 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/21.3.223
Bone response to orthodontic loading of endosseous implants in the rabbit calvaria: early continuous distalizing forces

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The purpose of this experimental study was to evaluate the effect of early orthodontic loading on the stability and bone-implant interface of titanium implants in a rabbit model. Twenty-four short threaded titanium fixtures were inserted in the calvarial mid-sagittal suture of 10 rabbits. Two weeks following insertion, 20 implants (test group) were subjected to continuous distalization forces of 150 g for a period of 8 weeks. The remaining four implants (control group) were left unloaded for the same follow-up interval. Clinically, all implants except for one test fixture were stable, and exhibited no mobility or displacement throughout the experimental loading period. Histologically, all stable implants were well-integrated into bone. No differences could be found between the pressure and tension surfaces of the test implants relative to bone quality and density within a range of 1000 μm from the fixture surface. Similarly, qualitative differences were not observed between the apical and coronal portions of test fixtures. Morphometrically, a mean percentage bone-to-implant contact of 76.00 ± 18.73 per cent was found at the test pressure sides, 75.00 ± 11.54 per cent at the test tension sides, and 68.00 ± 15.55 per cent at the control unloaded surfaces. No statistically significant differences in the percentage of bone-to-metal contact length fraction were found between test pressure surfaces, test tension surfaces, and unloaded control surfaces. Marginal bone resorption around the implant collar or immediately beneath it was found in roughly the same percentage of analysed sites in the test and control fixtures. In contrast, slight bone apposition was demonstrated at the implant collar on the test pressure surfaces, while no apposition ro resorption were observed in the test tension zones. This study suggests that short endosseous implants can be used as anchoring units for orthodontic tooth movement early in the post-insertion healing period.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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