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Stability of upper incisor inclination changes in Class II division 2 patients
H Devreese1, G De Pauw, G Van Maele
1Orthodontic Department, School of Dentistry.
European Journal of Orthodontics
|May 8, 2007
Summary
Orthodontic treatment significantly corrected incisor inclination in Class II division 2 patients. Long-term retention showed minimal, clinically irrelevant relapse, independent of retainer type.
Area of Science:
- Orthodontics
- Dental Morphology
- Cephalometrics
Background:
- Class II division 2 malocclusion presents unique challenges in orthodontic treatment, particularly concerning incisor inclination.
- Maintaining incisor position after active correction is crucial for long-term treatment success.
Purpose of the Study:
- To evaluate changes in upper incisor inclination after orthodontic treatment in Class II division 2 patients.
- To assess the long-term stability of incisor inclination following retention.
- To investigate the influence of retention appliance type on stability.
Main Methods:
- A cohort of 61 Class II division 2 patients (mean age 13.4 years) was studied.
- Dental casts and cephalograms were analyzed at three time points: pre-treatment, post-treatment, and 3.5 years post-retention.
- A novel method for measuring incisor inclination on dental casts was developed and validated.
Main Results:
- Orthodontic treatment resulted in a mean incisor inclination change of 15.2 degrees.
- A mean relapse of 2.2 degrees was observed post-retention, deemed clinically insignificant.
- Relapse was not significantly influenced by the type of retention appliance used (Hawley or lingual retainer).
- A minor, clinically irrelevant decrease in lip line height was noted post-treatment.
Conclusions:
- Orthodontic treatment effectively corrects incisor inclination in Class II division 2 patients.
- Long-term stability of incisor inclination is generally good, with minimal relapse.
- Retention appliance type does not appear to significantly impact long-term stability of incisor inclination.
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