MEDLINE Journals

    Parameters affecting primary stability of orthodontic mini-implants.

    Authors
    Wilmes B, Rademacher C, Olthoff G, et al. 
    Source
    J Orofac Orthop 2006 May; 67(3) :162-74.
    Abstract

    Treatment options in orthodontics have been expanded by skeletal anchorage via mini-implants over the last few years. Sufficient primary stability is imperative to minimize implant loss rate. The aim of this study was to quantitatively analyze the factors influencing primary stability: bone quality, implant-design, diameter, and depth of pilot drilling.Thirty-six pelvic bone segments (ilium) of country pigs were dissected and embedded in resin. To determine the primary stability, we measured the insertion torque of five different mini-implant types (tomas-pin [Dentaurum, Ispringen, Germany] 08 and 10 mm, and Dual Top [Jeil Medical Corporation, Seoul, Korea] 1.6 x 8 and 10 mm plus 2 x 10 mm). Twenty-five or 30 implants were inserted into each pelvic bone segment following preparation of the implant sites using pilot drill diameters of 1.0, 1.1, 1.2 and 1.3 mm and pilot drill depths of 1, 2, 3, 6 and 10 mm. Five implants were inserted for reference purposes to establish comparability. Thicknesses of bone compacta were measured via micro-computer tomography.Insertion torques of orthodontic mini-implants and therefore primary stability varied greatly, depending on bone quality, implant-design, and preparation of implant site. Compared with the tomas-pin, the Dual Top screw showed significantly greater primary stability. Torque moments beyond 230 Nmm caused fractures of 9 Dual Top screws.Compacta thickness, implant design and implant site preparation have a strong impact on the primary stability of mini-implants for orthodontic anchorage. Depending on the insertion site and local bone quality, the clinician should choose an optimum combination of implant and pilot-drilling diameter and depth.

    Mesh
    Animals
    Biomechanical Phenomena
    Bone Nails
    Bone Screws
    Equipment Design
    Microcomputers
    Miniaturization
    Orthodontics, Corrective
    Robotics
    Software
    Suture Anchors
    Swine
    Tomography, X-Ray Computed
    Tooth Movement
    Torque
    Language

    eng ger

    Pub Type(s)
    Comparative Study Journal Article
    PubMed ID

    16736117

    Content Manager
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