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The Establishment of a Murine Mandibular Molar Extraction Socket Healing Model
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[Casting Nance arch which allowed the upper canine's self-adjustment in the extraction cases].

Fei Qin1, Xiao-qing Ma, Pei-cheng Xu

  • 1Shanghai Xuhui District Dental Center. Shanghai 200032，China.

Shanghai Kou Qiang Yi Xue = Shanghai Journal of Stomatology
|June 23, 2016
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Summary

First premolar extraction aids adolescent canine self-correction. Casting Nance arches effectively maintain upper first molar positions during orthodontic treatment.

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Area of Science:

  • Orthodontics
  • Dental Arch Analysis
  • Adolescent Dental Health

Background:

  • Severe dental crowding often necessitates tooth extraction for effective orthodontic treatment.
  • Maintaining molar anchorage is crucial during space closure and tooth movement in orthodontics.

Purpose of the Study:

  • To evaluate the spontaneous self-adjustment of upper canines following first premolar extraction.
  • To assess the efficacy of a casting Nance arch in preserving the position of upper first molars.

Main Methods:

  • A cohort of 20 adolescents with severely crowded arches and labially displaced upper canines was selected.
  • Upper first premolars were extracted, and custom casting Nance arches were placed on the upper first molars.
  • Measurements were taken, and fixed orthodontic treatment commenced six months post-extraction; data analyzed using Graphpad Prism 6.0.

Main Results:

  • Significant canine self-adjustment was observed, averaging 3.6±0.1 mm (P<0.01).
  • Minimal forward movement of the upper first molars was recorded (0.2±0.16 mm, P>0.05), indicating stable anchorage.

Conclusions:

  • First premolar extraction is a viable strategy promoting canine self-correction in adolescent orthodontic cases.
  • Casting Nance arches serve as an effective appliance for maintaining upper first molar stability during orthodontic treatment.