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Updated: Jul 9, 2026

The Establishment of a Murine Maxillary Orthodontic Model
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Scissors-bite correction on second molar with a dragon helix appliance.

Sung Won Yun1, Won Hee Lim, Deuck Ryong Chong

  • 1Division of Orthodontics, Department of Dentistry, Ewha Woman's University, Seoul, Korea.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|December 11, 2007
PubMed
Summary

A new Dragon Helix appliance effectively corrects scissors-bite (a malocclusion) using indirect skeletal anchorage. This innovative approach overcomes issues like anchorage loss seen in conventional orthodontic treatments.

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Area of Science:

  • Orthodontics
  • Biomaterials Engineering

Background:

  • Scissors-bite (malocclusion) correction requires precise tooth movement, often involving intrusion and palatal tipping of extruded, buccally flared teeth.
  • Conventional orthodontic methods for scissors-bite correction face challenges including frequent bonding failures and compromised anchorage retention.

Observation:

  • A novel 'dragon helix' spring appliance, integrated with an indirect skeletal anchorage system, was employed for scissors-bite correction.
  • This appliance design is characterized by its simplicity, compact size, and purported effectiveness in facilitating controlled tooth movement.

Findings:

  • The dragon helix appliance demonstrated successful correction of scissors-bite in the reported case.
  • The appliance facilitated efficient and controlled tooth movement, addressing the specific biomechanical requirements of intruding and tipping the affected teeth.

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Implications:

  • The dragon helix appliance offers a promising alternative for orthodontic treatment of scissors-bite, potentially improving treatment outcomes.
  • This approach may reduce the incidence of common complications associated with conventional methods, such as anchorage loss and appliance failure.