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Incremental versus maximum bite advancement during twin-block therapy: a randomized controlled clinical trial
Phil Banks1, Jean Wright, Kevin O'Brien
1Burnley General Hospital, Burnley, United Kingdom. philbanks_burnly@yahoo.com
Summary
Incremental bite advancement using the Twin-block appliance showed no benefits over maximum advancement for treating Class II Division 1 malocclusion. Patient age and operator influenced compliance and treatment duration, not the advancement method.
Area of Science:
- Orthodontics
- Dentofacial Orthopedics
Background:
- Class II Division 1 malocclusion is a common dental issue.
- The Twin-block appliance is frequently used for its treatment.
Purpose of the Study:
- To compare the effectiveness of incremental versus maximum bite advancement with the Twin-block appliance.
- To assess treatment outcomes and patient compliance.
Main Methods:
- A randomized controlled trial involving 203 patients (10-14 years old) across 3 UK hospitals.
- Two groups: standard Twin-block (edge-to-edge bite) and incremental Twin-block (2mm initial and 6-weekly advancements).
- Data collected at the start and end of Twin-block treatment.
Main Results:
- Incremental bite advancement offered no discernible advantages in treatment process or outcome.
- Patient compliance was affected by operator and patient age.
- Treatment duration varied based on operator and initial overjet.
Conclusions:
- Incremental bite advancement with the Twin-block appliance is not superior to maximum advancement for Class II Division 1 malocclusion.
- Operator and patient factors significantly influence treatment variables.