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Arch-width changes in extraction vs nonextraction treatments in matched Class I borderline malocclusions.
Claudio Herzog1, Dimitrios Konstantonis2, Nikoleta Konstantoni3
1Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, Faculty of Medicine, University of Zurich, Zurich, Switzerland.
Summary
Orthodontic treatment involving first premolar extraction in borderline Class I cases significantly reduced arch perimeters and intermolar widths. Intercanine widths remained unchanged between extraction and nonextraction groups.
Area of Science:
- Orthodontics
- Dental Arch Analysis
- Craniofacial Development
Background:
- Class I malocclusion presents diverse treatment considerations.
- Borderline cases require careful evaluation for extraction decisions.
- Understanding post-treatment arch dimension changes is crucial for stability.
Purpose of the Study:
- Identify borderline Class I extraction and nonextraction patients.
- Investigate post-treatment changes in dental arch width and perimeter.
- Compare treatment outcomes between extraction and nonextraction groups.
Main Methods:
- Discriminant analysis identified a borderline Class I subsample (n=62).
- Patients were divided into extraction (n=31) and nonextraction (n=31) groups.
- Digital scanning assessed maxillary and mandibular intercanine/intermolar widths and perimeters.
Main Results:
- Extraction group showed increased intercanine width but decreased intermolar width and arch perimeters.
- Nonextraction group showed increased arch widths; perimeters were maintained.
- Significant differences observed in intermolar widths and arch perimeters between groups.
Conclusions:
- Extraction of four first premolars in borderline Class I cases leads to reduced intermolar width and arch perimeter.
- Intercanine width showed no significant difference between extraction and nonextraction groups.
- Findings aid in predicting treatment outcomes for borderline Class I patients.