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Extra-oral retraction mechanics: a review
1Department of Orthodontics, Faculty of Dentistry, Khon Kaen University, Thailand. keigod@mail.kku.ac.th
Australian Orthodontic Journal
|July 6, 2004
Summary
This review questions conventional wisdom on how different extra-oral retraction vectors affect the maxillary dental arch and maxilla. Current research lacks the rigorous design for definitive conclusions on orthodontic and orthopaedic effects.
Area of Science:
- Orthodontics
- Craniofacial Biology
- Biomechanics
Background:
- Extra-oral retraction is used in orthodontics and orthopaedics to modify maxillary and dental arch position.
- Understanding the centers of resistance is crucial for predicting treatment outcomes.
- Conventional clinical approaches utilize various vector types (cervical, straight, high-pull).
Purpose of the Study:
- To review the literature on the centers of resistance of the maxillary molars, dental arch, and maxilla.
- To evaluate the effects of different extra-oral retraction vectors (orthodontic and orthopaedic).
- To question established clinical assumptions regarding vector efficacy.
Main Methods:
- Systematic literature review.
- Analysis of studies investigating maxillary molar, dental arch, and skeletal anchorage.
- Evaluation of biomechanical principles related to extra-oral force systems.
Main Results:
- Literature demonstrates variability in reported centers of resistance.
- The precise effects of cervical-, straight-, and high-pull vectors are not consistently defined.
- Existing studies often lack the necessary controls and methodologies for clear interpretation.
Conclusions:
- Published research on extra-oral retraction vectors and their effects on the maxillary complex is inconclusive.
- Further methodologically rigorous studies are required to establish definitive clinical guidelines.
- Current understanding of biomechanical responses to different vectors needs substantial revision.