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<p>In a super-aging society, there is an increasing number of bedridden and partially or completely edentulous patients, presenting a challenge for conventional dental treatment. While closed magnetic-circuit attachments for implant overdentures are clinically established, an open magnetic-circuit attachment system that generates an attractive force by interposing alveolar mucosa between a denture-embedded magnet and a submucosal keeper has not yet been developed. This study aimed to develop a new open magnetic-circuit type magnetic attachment and a magnetic shielding system to mitigate magnetic-field leakage. A prototype of an open-circuit N55 neodymium magnet (φ4 × 2&#xa0;mm) has been developed. To reduce magnetic-field leakage, shielding devices were fabricated from high-permeability soft-magnetic materials: Sendust and Permalloy B. A 3-spatial magnetic field analyzer was used to measure the spatial distribution of the magnetic field. The results showed that the shielding devices effectively reduced magnetic-field leakage. For the N55 magnet, the maximum magnetic field on the shield surface was 67.6 mT with Sendust and 79.7 mT with Permalloy B, representing a significant reduction relative to the magnet surface values of 389.0 mT and 392.6 mT, respectively. This study demonstrated the effectiveness of the developed open magnetic-circuit magnetic attachment/magnetic shielding system, paving the way for its application in overdentures for dental implants.</p>

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The development of the open magnetic-circuit type magnetic attachment and magnetic shielding system for dental implant overdentures

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Hitoshi Akiyama,
  • Shin Ogura,
  • Maiko Hara,
  • Minori Hatta,
  • Jun Takei,
  • Ryoichi Akama

摘要

In a super-aging society, there is an increasing number of bedridden and partially or completely edentulous patients, presenting a challenge for conventional dental treatment. While closed magnetic-circuit attachments for implant overdentures are clinically established, an open magnetic-circuit attachment system that generates an attractive force by interposing alveolar mucosa between a denture-embedded magnet and a submucosal keeper has not yet been developed. This study aimed to develop a new open magnetic-circuit type magnetic attachment and a magnetic shielding system to mitigate magnetic-field leakage. A prototype of an open-circuit N55 neodymium magnet (φ4 × 2 mm) has been developed. To reduce magnetic-field leakage, shielding devices were fabricated from high-permeability soft-magnetic materials: Sendust and Permalloy B. A 3-spatial magnetic field analyzer was used to measure the spatial distribution of the magnetic field. The results showed that the shielding devices effectively reduced magnetic-field leakage. For the N55 magnet, the maximum magnetic field on the shield surface was 67.6 mT with Sendust and 79.7 mT with Permalloy B, representing a significant reduction relative to the magnet surface values of 389.0 mT and 392.6 mT, respectively. This study demonstrated the effectiveness of the developed open magnetic-circuit magnetic attachment/magnetic shielding system, paving the way for its application in overdentures for dental implants.