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Related Experiment Videos

Anchorage loss--a multifactorial response.

Silvia Geron1, Nir Shpack, Samouil Kandos

  • 1Department of Orthodontics, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel. jgeron@zahav.net.il

The Angle Orthodontist
|January 15, 2004
PubMed
Summary

Anchorage loss (AL) during orthodontic treatment is reduced by increased dental crowding and is greater with labial appliances. Other factors like age and extraction site have minor effects.

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Area of Science:

  • Orthodontics
  • Dental Mechanics
  • Craniofacial Biology

Background:

  • Anchorage loss (AL) is a potential complication in orthodontic mechanotherapy.
  • Defining and understanding AL is crucial for effective treatment planning.

Purpose of the Study:

  • To investigate the multifactorial nature of anchorage loss during orthodontic treatment.
  • To identify key factors influencing anchorage loss in patients undergoing premolar extraction space closure.

Main Methods:

  • A study of 87 patients with bilateral maxillary premolar extractions, categorized by extraction site, appliance type, and age.
  • Analysis of serial lateral cephalograms and dental casts to quantify mesial molar movement.
  • Statistical analysis to determine correlations between AL and factors like crowding, overjet, age, extraction site, and appliance type.

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Main Results:

  • Increased dental crowding significantly decreased anchorage loss (r = -0.66, P = .001).
  • Labial edgewise appliances showed significantly greater AL than lingual appliances (P < .05).
  • Age, extraction site, and overjet showed weaker correlations with AL.

Conclusions:

  • Anchorage loss is a multifactorial response influenced primarily by dental crowding and appliance mechanics.
  • Crowding and appliance type are primary determinants of anchorage loss, while age, extraction site, and overjet are secondary factors.