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Related Experiment Videos

Uprighting molars without extrusion.

W C Shellhart1, L J Oesterle

  • 1Division of Orthodontics, University of Colorado School of Dentistry, Denver 80262, USA.

Journal of the American Dental Association (1939)
|March 23, 1999
PubMed
Summary
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Orthodontic molar uprighting can now be achieved without extrusion using a modified helical uprighting spring. This technique offers a beneficial alternative for dental practitioners seeking precise molar control.

Area of Science:

  • Orthodontics
  • Biomaterials Engineering

Background:

  • Molar uprighting is a common orthodontic procedure.
  • Unintended molar extrusion can complicate treatment outcomes.
  • Existing appliances, like the helical uprighting spring, often induce extrusion.

Purpose of the Study:

  • To review and compare molar uprighting with and without extrusion.
  • To present a modified helical uprighting spring strategy for non-extrusive uprighting.

Main Methods:

  • Review of existing orthodontic literature on molar uprighting.
  • Analysis of the biomechanical forces generated by helical uprighting springs.
  • Description of a modification to the helical uprighting spring to prevent extrusion.

Main Results:

Related Experiment Videos

  • The helical uprighting spring commonly used exerts an extrusive force.
  • A modified appliance design can achieve molar uprighting without extrusion.
  • Understanding the biomechanics allows for targeted appliance modification.

Conclusions:

  • Dental practitioners can achieve molar uprighting without extrusion.
  • The modified helical uprighting spring offers a precise alternative.
  • Appropriate appliance selection and use are key to successful non-extrusive uprighting.