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In Vivo Evaluation of Immediately Loaded Stainless Steel and Titanium Orthodontic Screws in a Growing Bone

Abstract : The present work intends to evaluate the use of immediate loaded orthodontic screws in a growing model, and to study the specific bone response. Thirty-two screws (half of stainless steel and half of titanium) were inserted in the alveolar bone of 8 growing pigs. The devices were immediately loaded with a 100 g orthodontic force. Two loading periods were assessed: 4 and 12 weeks. Both systems of screws were clinically assessed. Histological observations and histomorphometric analysis evaluated the percent of ‘‘bone-to-implant contact’’ and static and dynamic bone parameters in the vicinity of the devices (test zone) and in a bone area located 1.5 cm posterior to the devices (control zone). Both systems exhibit similar responses for the survival rate; 87.5% and 81.3% for stainless steel and titanium respectively (p = 0.64; 4-week period), and 62.5% and 50.0% for stainless steel and titanium respectively (p = 0.09; 12-week period). No significant differences between the devices were found regarding the percent of ‘‘bone-to-implant contact’’ (p = 0.1) or the static and dynamic bone parameters. However, the 5% threshold of ‘‘bone-to-implant contact’’ was obtained after 4 weeks with the stainless steel devices, leading to increased survival rate values. Bone in the vicinity of the miniscrew implants showed evidence of a significant increase in bone trabecular thickness when compared to bone in the control zone (p = 0.05). In our study, it is likely that increased trabecular thickness is a way for low density bone to respond to the stress induced by loading.
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https://hal.archives-ouvertes.fr/hal-02379487
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Submitted on : Monday, November 25, 2019 - 4:56:34 PM
Last modification on : Saturday, June 27, 2020 - 3:08:38 AM

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Kerstin Gritsch, Norbert Laroche, Jeanne-Marie Bonnet, Patrick Exbrayat, Laurent Morgon, et al.. In Vivo Evaluation of Immediately Loaded Stainless Steel and Titanium Orthodontic Screws in a Growing Bone. PLoS ONE, Public Library of Science, 2013, 8 (10), pp.e76223. ⟨10.1371/journal.pone.0076223⟩. ⟨hal-02379487⟩

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