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Do dual-thread orthodontic mini-implants improve bone/tissue mechanical retention?

Yang-Sung Lin1, Yau-Zen Chang, Jian-Hong Yu

  • 1*Student, Department of Mechanical Engineering, Chang Gung University, Taoyuan, Taiwan. †Professor, Department of Mechanical Engineering, Chang Gung University, Taoyuan, Taiwan. ‡Associate Professor, School of Dentistry, China Medical University, Taichung, Taiwan. §Professor, Department of Biomedical Engineering, National Yang-Ming University, Taipei, Taiwan.

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Summary

Dual-thread mini-implants with optimized micro thread pitch enhance primary stability and mechanical retention in bone. This design improves implant performance compared to single-thread designs.

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Area of Science:

  • Dental Implantology
  • Biomaterials Engineering
  • Orthodontics

Background:

  • Primary stability is crucial for dental implant success.
  • Optimizing thread design, particularly micro and macro thread pitch relationships, is key to enhancing implant stability.
  • Dual-thread designs offer potential advantages over single-thread designs.

Purpose of the Study:

  • To investigate the impact of pitch relationships in dual-thread mini-implants on primary stability.
  • To compare the performance of dual-thread designs with varying micro-thread pitches against single-thread designs.

Main Methods:

  • Three mini-implant types were tested: single-thread (ST), dual-thread A (DTA), and dual-thread B (DTB).
  • Insertion torque and pull-out strength were measured.
  • Histomorphometric analysis evaluated peri-implant bone defects.

Main Results:

  • Dual-thread A (DTA) showed the smallest maximum insertion torque but significantly greater pull-out strength than single-thread (ST) implants.
  • No significant difference in insertion torque was found between ST and dual-thread B (DTB) implants.
  • Both ST and DTA designs demonstrated good engagement with cortical bone.

Conclusions:

  • A dual-thread mini-implant with an appropriate micro thread pitch, parametrically related to the macro thread pitch, improves primary stability.
  • This optimized dual-thread design enhances mechanical retention in the cortical bone region.
  • The findings suggest that specific dual-thread configurations can lead to superior dental implant stability.