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Published on: February 23, 2024
Condylar growth and mandibular positioning with stepwise vs maximum advancement
Urban Hägg1, A Bakr M Rabie, Margareta Bendeus
1Department of Orthodontics, University of Hong Kong, Hong Kong. euohagg@hkusua.hku.hk
Summary
Different Class II malocclusion treatments impact condylar growth and mandibular position. Fixed appliances with stepwise advancement showed greater effects on mandibular prognathism and lower facial height compared to removable ones.
Area of Science:
- Orthodontics
- Craniofacial Biology
Background:
- Class II malocclusion is a common dental issue.
- Effective treatment strategies for Class II malocclusion are crucial for optimal facial development.
Purpose of the Study:
- To compare the effects of three Class II malocclusion treatments on condylar growth and mandibular positioning.
- To evaluate the influence of different functional appliance designs and activation methods.
Main Methods:
- Lateral cephalograms were analyzed from patients treated with headgear-activator (stepwise or maximum mandibular advancement) or headgear-Herbst (stepwise advancement).
- Net treatment effects were calculated using 6-month growth data from matched controls.
- Analysis focused on condylar growth, mandibular prognathism, and lower-facial height.
Main Results:
- Stepwise advancement enhanced mandibular prognathism, particularly with fixed appliances, during the initial therapy phase.
- Lower-facial height increased with stepwise advancement (HGA-S), remained unchanged with maximum jumping (HGA-M), and was restrained by the Herbst appliance (HGH-S).
- Appliance design and activation (stepwise vs. maximum jumping) influenced condylar bone apposition patterns.
Conclusions:
- The method of mandibular advancement, vertical opening, and appliance type (fixed vs. removable) significantly influence condylar growth and mandibular position in Class II malocclusion treatment.
