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Quintessence Publishing: Journals: ORTHODONTICS
ORTHODONTICS
The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by
Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

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Publication:
Winter 2010
Volume 11 , Issue 4

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Mini-Implant Behavior To Shear Tensile Forces In The Porcine Mandible

Christopher W. Edwards, DDS/James K. Mah, DDS, MSc, DMSc

Pages: 362368
PMID: 21491003

Aim: To determine the tangential tensile force loading behavior of mini-implants relative to cortical bone thickness in the porcine mandible. Methods: Eighteen mini-implants were placed both anteriorly and posteriorly perpendicular to the bone surface in porcine mandibles and subjected to shear tests using a Universal Testing Machine (Instron). Further, cone beam CT was used to measure cortical bone thickness at each mini-implant site. Results: The shear strength differed significantly between the anterior (mean 89.05 35.9 N) and posterior (mean 179.85 29.01 N) sites. The same was true for the cortical bone thickness (anteriorly, mean 3.59 0.49 mm; posteriorly, mean 4.24 0.5 mm). Conclusion: The shear forces required to dislodge mini-implants were much higher than forces typically applied for orthodontic purposes. Therefore, mandibular cortical bone supporting monocortical orthodontic mini-implants would most likely withstand immediate loading with tangential shear forces. In addition, it seems that mini-implants loaded tangentially continue to exhibit adequate anchorage for orthodontic forces even after they are displaced. World J Orthod 2010;11:362368.

Key words: orthodontic, temporary anchorage device, implant, tensile force

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