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Maxillary anterior alignment stability in Class I and Class II malocclusions treated with or without extraction
Willian Juarez Granucci Guirro1, Karina Maria Salvatore Freitas2, Guilherme Janson3
1a Orthodontic graduate student, Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.
The Angle Orthodontist
|April 7, 2015
Summary
Long-term stability of maxillary incisor alignment after orthodontic treatment for Class I and Class II malocclusions is similar whether or not teeth were extracted. Treatment approach did not significantly impact postretention outcomes.
Area of Science:
- Orthodontics
- Dental Arch Stability
- Malocclusion Treatment
Background:
- Maxillary incisor alignment stability is crucial for long-term orthodontic treatment success.
- Understanding the impact of extraction versus non-extraction on stability in different malocclusion types is essential.
Purpose of the Study:
- To compare the postretention stability of maxillary incisor alignment in subjects with Class I and Class II malocclusion.
- To evaluate differences between treatments with and without extractions.
Main Methods:
- 103 subjects with initial maxillary anterior irregularity >3 mm were divided into four groups based on malocclusion type (Class I/II) and treatment (extraction/non-extraction).
- Dental casts were analyzed at pretreatment, posttreatment, and long-term posttreatment to assess incisor irregularity and arch dimensions.
- Statistical analysis involved one-way ANOVA and Tukey tests for intergroup comparisons.
Main Results:
- Relapse of maxillary crowding and arch dimensions was similar across all treatment groups in the long-term posttreatment period.
- No significant differences in long-term stability were observed between extraction and non-extraction groups for Class I or Class II malocclusions.
Conclusions:
- Maxillary anterior alignment changes in Class I and Class II malocclusions demonstrate comparable long-term posttreatment stability regardless of whether extractions were performed.
- Orthodontic treatment approach (extraction vs. non-extraction) does not appear to influence the long-term stability of maxillary incisor alignment.
