Evaluation of the Microstructural Characteristics of Bone Surrounding Anchor Screws Placed under a Horizontal Load by Exploring the Orientation of Biological Apatite Crystals and Collagen Fiber Anisotropy

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  • Matsumoto Takaaki
    Oral Health Science Center, Tokyo Dental College Department of Orthodontics, Tokyo Dental College
  • Matsunaga Satoru
    Oral Health Science Center, Tokyo Dental College Department of Anatomy, Tokyo Dental College
  • Kasahara Masaaki
    Department of Dental Materials Science, Tokyo Dental College
  • Kasahara Norio
    Department of Histology and Developmental Biology, Tokyo Dental College
  • Nakano Takayoshi
    Division of Materials & Manufacturing Science, Graduate School of Engineering, Osaka University
  • Ishimoto Takuya
    Division of Materials & Manufacturing Science, Graduate School of Engineering, Osaka University
  • Nishii Yasushi
    Department of Orthodontics, Tokyo Dental College

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<p>The objective of this study was to carry out quantitative evaluations of the microstructural characteristics of bone surrounding anchor screws placed under a horizontal load and the microstructural characteristics of bone on the compressed and non-compressed sides of anchor screws by investigating the orientation of biological apatite (BAp) crystals and collagen fiber anisotropy. Anchor screws were implanted in the femurs of adult rats. They were divided into those placed under a horizontal load (horizontal loading group, n = 4), those not placed under a horizontal load (unloaded group, n = 4), and a sham group of rats that did not undergo femoral anchor screw implantation. In addition to histological observations, BAp crystal orientation and collagen fiber anisotropy were also analyzed. Osteocytes adjacent to anchor screws on the compressed side in the horizontal loading group were rounder in shape than those in normal femurs, the unloaded group, and on the non-compressed side in the horizontal loading group. Collagen fibers showed anisotropy on the non-compressed side in the horizontal loading group. BAp crystals also showed a uniaxial preferential orientation in the direction of traction on the compressed side in the horizontal loading group. These results demonstrated that the osteogenesis of bone around anchor screws placed under a sustained horizontal load gave this bone structural characteristics that differed in some respects from those of normal bone. They also showed that this bone acquired micro/nanostructural characteristics adapted to its new mechanical environment.</p>

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