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Lower arch perimeter preservation using the lingual arch

J Rebellato1, S J Lindauer, L K Rubenstein

  • 1Department of Orthodontics, Medical College of Virginia, Virginia Commonwealth University, Richmond, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|November 5, 1997
PubMed
Summary

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The mandibular lingual arch helps maintain lower arch perimeter during dental development. However, this benefit comes with a slight increase in lower incisor protrusion.

Area of Science:

  • Orthodontics
  • Dentofacial Orthopedics

Background:

  • Maintaining arch perimeter during mixed-to-permanent dentition transition is crucial for preventing malocclusion.
  • The mesial migration of first permanent molars can lead to arch length discrepancies.

Purpose of the Study:

  • To evaluate the effectiveness of a mandibular lingual arch in preserving arch perimeter.
  • To assess whether the lingual arch prevents mesial molar migration or causes incisor proclination.

Main Methods:

  • Randomized controlled trial with 30 patients (14 treatment, 16 control).
  • Analysis of study models, cephalograms, and tomograms at baseline and end of study.
  • Comparison of mandibular first molar and incisor positional changes and arch dimensions between groups.

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Main Results:

  • Statistically significant differences observed in molar and incisor positions and arch dimensions.
  • The lingual arch group showed reduced arch perimeter loss compared to the control group.
  • A slight increase in mandibular incisor proclination was noted in the treatment group.

Conclusions:

  • The mandibular lingual arch is effective in reducing arch perimeter loss during the mixed to permanent dentition transition.
  • This space maintenance comes at the cost of minor mandibular incisor proclination.