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Long-term stability of Class II, Division 1, nonextraction cervical face-bow therapy: I. Model analysis
T N Elms1, P H Buschang, R G Alexander
1Baylor College of Dentistry, Dallas, TX 75246, USA.
Summary
Long-term Class II, Division 1 nonextraction therapy using face-bow and full-fixed appliances demonstrates significant stability. Arch widths increased, and while arch length slightly decreased post-retention, overall results remained stable.
Area of Science:
- Orthodontics
- Dental Arch Stability
- Malocclusion Treatment
Background:
- Long-term stability of Class II, Division 1 nonextraction therapy is not well-documented.
- Understanding treatment outcomes is crucial for clinical decision-making.
Purpose of the Study:
- To evaluate the long-term stability of Class II, Division 1 nonextraction therapy.
- To assess changes in dental arch dimensions and occlusal relationships post-retention.
Main Methods:
- Retrospective study of 42 patients treated with face-bow and full-fixed appliances.
- Analysis of pretreatment, posttreatment, and long-term postretention records (average 23.1 years).
Main Results:
- Significant increases in mandibular and maxillary arch widths during treatment.
- Minimal changes in arch width and slight decrease in arch length post-retention.
- Overjet and overbite showed small increases after retention, with minimal relapse in mandibular incisor irregularity.
Conclusions:
- Nonextraction therapy for Class II malocclusion, using the described techniques, is largely stable long-term.
- The findings support the efficacy of this approach for achieving stable orthodontic results.