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Dental changes in the mandible during initial Bass appliance therapy
1Department of Orthodontics, Eastman Institutet, Stockholm, Sweden.
European Journal of Orthodontics
|April 29, 1998
Summary
Bass appliance therapy increased lower dental arch space by 1.8 mm over 6 months. This orthodontic treatment resulted in posterior molar movement and slight anterior incisor movement, improving severe Class II malocclusions.
Area of Science:
- Orthodontics
- Dentofacial Orthopedics
Background:
- Severe Class II, division 1 malocclusions present significant challenges in orthodontic treatment.
- Understanding tooth movement is crucial for effective orthodontic therapy.
Purpose of the Study:
- To analyze lower molar and incisor movements during 6 months of Bass appliance therapy.
- To evaluate the change in dental arch space during this treatment period.
Main Methods:
- Analysis of lateral cephalograms and dental casts from 53 patients with severe Class II, division 1 malocclusions.
- Measurement of tooth movement (molars and incisors) and dental arch space changes.
- Comparison with a control group of 16 patients observed for 6 months prior to treatment.
Main Results:
- Lower dental arch space increased by 1.8 mm during 6 months of Bass appliance therapy.
- Lower molars exhibited posterior movement (0.7 mm) and distal tipping (2.4 degrees).
- Lower incisors showed slight anterior movement (0.3 mm) and mesial tipping (0.5 degrees).
Conclusions:
- Bass appliance therapy effectively increases lower dental arch space in patients with severe Class II, division 1 malocclusions.
- The appliance facilitates controlled posterior molar movement and minimal incisor repositioning.