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Second Class Functional Treatment: Andreasen Activator vs Twin Block.

Giulia Baccaglione1, Elisa Rota2, Maurizio Ferrari2

  • 1Department of Medicine and Surgery, University of Milano Bicocca, Monza, Italy.

International Journal of Clinical Pediatric Dentistry
|August 4, 2020
PubMed
Summary
This summary is machine-generated.

This study compared the Andreasen Activator and Clark's Twin Block functional appliances for treating Class II malocclusion. Both devices advanced the mandible and improved facial aesthetics, with functional appliances yielding more skeletal than dental changes.

Keywords:
Andreasen activatorCephalometricsII classMalocclusionMandibleProspective longitudinal clinical studyTwin block

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Area of Science:

  • Orthodontics
  • Craniofacial Growth
  • Dental Biomaterials

Background:

  • Class II malocclusion is a common dental anomaly.
  • Functional appliances are used to correct skeletal discrepancies.
  • Comparing treatment outcomes of different functional appliances is crucial for clinical decision-making.

Purpose of the Study:

  • To compare the dental and skeletal effects of the Andreasen Activator and Clark's Twin Block.
  • To analyze changes in the sagittal and vertical planes using cephalometric analysis.
  • To evaluate treatment outcomes in patients with Class II division 1 malocclusion and normal or deep bite.

Main Methods:

  • Randomized controlled trial with 20 patients (8 female, 12 male).
  • Patients were divided into two groups, treated with either Andreasen Activator or Clark's Twin Block for approximately 18 months.
  • Cephalometric analysis of lateral radiographs assessed skeletal (angular and linear) and dental parameters before and after treatment.

Main Results:

  • Both functional appliances significantly increased mandibular length and sagittal advancement, with no significant changes in the maxilla.
  • The Andreasen Activator primarily improved overjet and overbite.
  • The Twin Block showed significant improvements in overjet, overbite, and upper incisor angulation, indicating greater dental compensation.

Conclusions:

  • Both Andreasen Activator and Twin Block effectively advance the mandible and increase its size in Class II patients.
  • Functional treatments yielded more pronounced skeletal than dental changes, particularly during peak pubertal growth.
  • These findings suggest functional appliances are effective in correcting skeletal Class II malocclusion with improved facial aesthetics.