Abstract
In this study, we analyzed the clinical factors and mechanical parameters for predicting orthodontic mini-implant (OMI) failure in the mandible, which has different properties from the maxilla. A patient-specific finite element analysis was applied to 32 OMIs (6 failures and 26 successes) implanted between the mandibular second premolars and first molars used for anchorage. The peak stress and strain parameters were calculated for each sample. A logistic regression of the failure (vs. success) of OMIs on the mechanical parameters in the models was conducted. In addition, the influence of clinical factors on the mechanical parameters considered to be related to OMI failure was examined by a regression analysis. The mechanical parameter which best predicts OMI failure in the mandible was found to be a minimum principal strain of between 0.5 to 1.0 mm from the OMI surface (R2 = 0.8033). The results indicate the patient's bone density, distance between the OMIs and adjacent root, and vertical implantation angle of the OMIs are potential clinical predictors of OMI failure in the mandible.
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This study was supported by the Research Institute of Applied Mechanics, Kyushu University.
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Toriya, T., Kitahara, T., Hyakutake, H. et al. Analysis for Predictors of Failure of Orthodontic Mini-implant Using Patient-Specific Finite Element Models. Ann Biomed Eng 51, 594–603 (2023). https://doi.org/10.1007/s10439-022-03067-z
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DOI: https://doi.org/10.1007/s10439-022-03067-z