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Long-term stability of Class II, Division 1, nonextraction cervical face-bow therapy: II. Cephalometric analysis
Summary
Long-term stability of Class II, Division 1 nonextraction therapy is largely achievable. Proper patient selection and compliance are key to maintaining treatment objectives and minimizing relapse.
Area of Science:
- Orthodontics
- Dental Traumatology
- Craniofacial Biology
Background:
- Class II, Division 1 malocclusion is a common dental issue.
- Nonextraction therapy is a treatment option for this condition.
- Understanding long-term stability is crucial for treatment success.
Purpose of the Study:
- To evaluate the long-term stability of Class II, Division 1 nonextraction therapy.
- To analyze cephalometric changes and relapse patterns after treatment.
Main Methods:
- A cohort of 42 patients with Class II, Division 1 malocclusion treated with cervical face-bows and fixed appliances was studied.
- Pretreatment, posttreatment, and postretention cephalometric records were analyzed.
- Long-term stability was assessed over an average of 11.6 years postretention.
Main Results:
- The ANB angle decreased by 2 degrees during treatment, primarily due to a decrease in the SNA angle.
- Lower incisors proclined 2.3 degrees and molars tipped back 4 degrees during treatment.
- Relapse was observed in lower incisor retroclination (5:1 ratio of proclination to retroclination) and molar uprighting (3:1 ratio).
Conclusions:
- Nonextraction therapy for Class II malocclusion can achieve largely stable outcomes.
- Proper patient selection, compliance, and achievement of treatment objectives are essential for long-term stability.
- Monitoring and managing incisor proclination and molar tipping are important to minimize relapse.