Long-term effectiveness and treatment timing for Bionator therapy

Area of Science:

• Orthodontics
• Pediatric Dentistry
• Craniofacial Growth

Background:

• Class II malocclusion requires timely intervention for optimal results.
• The Bionator appliance is commonly used for Class II correction.
• Understanding the long-term effects and ideal treatment timing is crucial.

Purpose of the Study:

• To evaluate the long-term effects of Bionator treatment for Class II malocclusion.
• To determine the optimal timing for initiating Bionator therapy based on skeletal maturity.
• To compare treatment outcomes with untreated controls.

Main Methods:

• Analysis of lateral cephalograms from 23 Class II patients treated with Bionator followed by fixed appliances.
• Grouping patients based on cervical vertebral maturation (CVM) into early and late treatment groups.
• Comparison of cephalometric changes between treated and untreated control groups.

Main Results:

• Bionator therapy followed by fixed appliances is most effective and stable when initiated during the pubertal growth spurt (CVM stage II).
• Treatment during the pubertal peak resulted in an average of 5.1 mm greater mandibular elongation compared to controls.
• Significant increases in mandibular ramus height and a backward direction of condylar growth were observed in the optimally timed treatment group.

Conclusions:

• The optimal time to initiate Bionator treatment for Class II malocclusion is at CVM stage II, coinciding with the pubertal growth spurt.
• Early intervention during peak growth maximizes mandibular skeletal changes and leads to stable, long-term results.
• This treatment protocol enhances mandibular growth and contributes to favorable craniofacial development.