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Class II malocclusion: mandibular retrusion or maxillary protrusion?
1Orthodontic Department, Eastman Dental Center, Rochester, NY, USA.
The Angle Orthodontist
|January 1, 1995
Summary
Class II skeletal patterns show diverse evaluations for maxillary protrusion and mandibular retrusion. Findings contrast between different cephalometric indicators, highlighting variability in diagnosing skeletal Class II malocclusion.
Area of Science:
- Orthodontics
- Cephalometric analysis
Background:
- Skeletal Class II malocclusion is common.
- Its etiology (mandibular retrusion vs. maxillary protrusion) is debated.
- Accurate diagnosis is crucial for effective orthodontic treatment.
Purpose of the Study:
- To determine if Class II patterns are primarily due to mandibular retrusion or maxillary protrusion.
- To compare the efficacy of various maxillary and mandibular sagittal cephalometric indicators.
- To analyze the diversity in evaluating these skeletal patterns.
Main Methods:
- Utilized the Fishman Skeletal Maturity Assessment (SMA) method for age stratification.
- Employed computerized cephalometric programs for subject selection and indicator comparison.
- Analyzed a sample of skeletal Class II subjects across 11 maturity levels.
Main Results:
- Significant diversity observed in evaluating maxillary protrusion and mandibular retrusion.
- Downs facial angle identified only 27% of the sample with mandibular retrusion.
- Angle NA-FH indicated maxillary protrusion in 56.3% of the sample.
- Results contrast markedly with other cephalometric indicators.
Conclusions:
- Cephalometric indicator selection significantly impacts the diagnosis of Class II skeletal patterns.
- No single indicator reliably identifies the primary cause of Class II malocclusion.
- Further research is needed to standardize diagnostic criteria for skeletal Class II.