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Bimaxillary dentoalveolar protrusion: traits and orthodontic correction
Daniel A Bills1, Chester S Handelman, Ellen A BeGole
1Department of Orthodontics, College of Dentistry, University of Illinois at Chicago, Chicago, Ill, USA.
The Angle Orthodontist
|May 19, 2005
Summary
Orthodontic treatment using four premolar extractions effectively corrects bimaxillary protrusion by reducing dental and lip protrusion. This study provides evidence supporting this common orthodontic approach for improved facial aesthetics.
Area of Science:
- Dentistry
- Orthodontics
- Cephalometrics
Background:
- Bimaxillary protrusion is a malocclusion characterized by specific cephalometric and soft tissue traits.
- Understanding these traits is crucial for effective orthodontic diagnosis and treatment planning.
Purpose of the Study:
- To investigate the pretreatment cephalometric characteristics of bimaxillary protrusion.
- To evaluate the efficacy of orthodontic correction involving four premolar extractions and anterior teeth retraction.
Main Methods:
- A cohort of 48 ethnically diverse patients with bimaxillary protrusion was analyzed.
- Pre- and posttreatment lateral cephalograms were assessed using 18 linear and angular measurements.
- Paired t-tests were employed to determine the significance of treatment effects.
Main Results:
- Patients exhibited increased incisor proclination, vertical facial pattern, lip procumbency, reduced nasolabial angle, and specific alveolar bone changes.
- Orthodontic treatment with four premolar extractions significantly reduced dental and soft tissue protrusion.
- Cephalometric standards for bimaxillary protrusion were established.
Conclusions:
- Four premolar extractions are a highly successful treatment for bimaxillary protrusion.
- This approach effectively addresses both dental and soft tissue procumbency.
- The findings offer a stronger evidence-based rationale for this orthodontic treatment modality.