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A New Implantation Method for Orthodontic Anchor Screws: Basic Research for Clinical Applications.

Reiko Tokuyama-Toda1, Hirochika Umeki1, Shinji Ide1

  • 1Department of Oral Medicine and Stomatology, School of Dental Medicine, Tsurumi University, 2-1-3, Tsurumi, Tsurumi-Ku, Yokohama 230-8501, Kanagawa, Japan.

Biomedicines
|March 29, 2023
PubMed
Summary

Removing oral mucosa around implanted anchor mini-screws reduces stress on the bone and screw. This direct bone contact enhances the stability of mini-screws, preventing dislodgement.

Keywords:
FEM analysisimplantation methodmini-screworthodontic anchor screwsvon Mises stress

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Area of Science:

  • Orthodontics
  • Biomaterials Engineering
  • Surgical Procedures

Background:

  • Implanted anchor mini-screws are crucial for orthodontic anchorage.
  • The positional relationship between the screw head and alveolar bone can influence screw stability.
  • A gap created by oral mucosa may affect stress distribution.

Purpose of the Study:

  • To investigate how the gap between the mini-screw head and alveolar bone affects stress.
  • To determine if eliminating this gap improves the stability of implanted anchor screws.
  • To evaluate the impact of surgical modification on stress loads.

Main Methods:

  • Histological examination of mini-screws placed in rabbit palates to assess the gap.
  • Finite element analysis to compare stress distribution in 'contact' versus 'gap' groups.
  • Evaluation of cortical bone thickness and load strength effects.

Main Results:

  • Histology confirmed an oral mucosa gap in conventional procedures; removal eliminated the gap.
  • Finite element analysis showed significantly higher stress on bone and screw in the 'gap' group compared to the 'contact' group.
  • Cortical bone thickness and load strength did not significantly alter stress patterns between groups.

Conclusions:

  • Eliminating the oral mucosa gap by ensuring direct bone contact reduces stress on both the alveolar bone and the anchor screw.
  • This surgical approach of direct bone contact can enhance the stability of implanted mini-screws and prevent undesirable dislodgement.