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Proportional changes in cephalometric distances during Twin Block appliance therapy
1Department of Oral and Maxillo Facial Surgery and Orthodontics Royal Preston Hospital, Lancashire, UK.
European Journal of Orthodontics
|November 1, 2002
Summary
The Twin Block appliance significantly altered facial growth in young patients, increasing mandibular length and retracting upper incisors. This orthodontic device effectively modified lower face heights, offering valuable insights for treatment planning.
Area of Science:
- Dentistry
- Orthodontics
- Cephalometrics
Background:
- The Twin Block appliance is a common orthodontic device used for treating malocclusions.
- Previous studies have primarily focused on cephalometric angles to assess its effects.
- A need exists to evaluate linear dimensional changes for a more comprehensive understanding.
Purpose of the Study:
- To quantitatively assess the cephalometric changes in facial dimensions induced by the Twin Block appliance.
- To evaluate alterations in linear dimensions rather than traditional cephalometric angles.
Main Methods:
- Lateral cephalometric radiographs of 30 patients (mean age 12.5 years) before and after Twin Block treatment were analyzed.
- Changes were measured as percentage alterations in linear dimensions.
- Control data, matched for age, sex, and treatment duration, were used for comparison.
Main Results:
- Clinically significant increases were observed in lower anterior face height (6.6%) and posterior face height (4.6%).
- Upper incisor retraction (4.9%) and increased mandibular length (Co-B: 3.3%, Co-Po: 2.6%) were also noted.
- Specific increases in mandibular length included Ar-B (3.5%) and Ar-Po (2.2%).
Conclusions:
- The Twin Block appliance produces significant and measurable changes in facial linear dimensions.
- Findings indicate favorable effects on mandibular growth and incisor positioning.
- This study provides a detailed analysis of linear cephalometric changes associated with Twin Block therapy.
