Two new papers in orthodontics and computational mechanics


Two new papers have been appeared this month about computational mechanics and orthodontics: Finite Element Comparison of 10 Orthodontic Microscrews with Different Cortical Bone Parameters and Design Characteristics, Primary Stability and Risk of Fracture of Orthodontic Mini-Implants: Pilot Scan Electron Microscope and Mechanical Studies.

Finite Element Comparison of 10 Orthodontic Microscrews with Different Cortical Bone Parameters by J. Marcé-Nogué, A. Walter, LL. Gil and A. Puigdollers in the International Journal of Oral and Maxillofacial Implants (http://www.quintpub.com/journals/omi/full_txt_pdf_alert.php?article_id=13353) where the influence of geometrical parameters in cortical bone is analysed with a series of computational simulations with FEA Package ANSYS 12.0 to obtain Von Mises stresses and deformations in the MS when they are loaded with a perpendicular traction force of 1 N considering an angle of incidence as a random parameter.

In Design Characteristics, Primary Stability and Risk of Fracture of Orthodontic Mini-Implants: Pilot Scan Electron Microscope and Mechanical Studies.
by A. Walter, H. Winsauer H, J. Marcé-Nogue J, S. Mojal and A.Puigdollers in Medicina Oral Patologia Oral y Cirugia Bucal (http://www.ncbi.nlm.nih.gov/pubmed/23722125), twelve self-drilling OMIs (2 small, 6 medium, 4 large) from 8 manufacturers were tested for their primary stability in simulated medium-high cancellous bone and the risk to fracture in high-density methacrylate blocks. For the assessments of the maximum insertion torque (IT) and torsional fracture (TF) 5 of each OMI were used and for the pull-out strength (POS) 10. The OMIs were inserted with a torque screwdriver (12 sec/360°) until the bottom at 8 mm depth was reached. OMI designs were analyzed with a scan electron microscope (SEM).

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