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[Mandible function in taking construction bite for activator].

M Irie

    Gifu Shika Gakkai Zasshi = the Journal of Gifu Dental Society
    |June 1, 1989
    PubMed
    Summary
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    This study investigated the functional effects of Andresen-type activator treatment in children with anterior crossbite, analyzing muscle activity and jaw movements. Findings indicate that activator forces and jaw positioning vary based on hyoid bone movement direction and patient type.

    Area of Science:

    • Orthodontics and Dentofacial Orthopedics
    • Biomechanics of Masticatory System
    • Craniofacial Growth and Development

    Context:

    • Anterior crossbite in mixed dentition presents challenges for normal craniofacial development.
    • The Andresen-type activator is a common functional appliance used to correct such malocclusions.
    • Understanding the biomechanical effects on masticatory muscles and skeletal structures is crucial for treatment efficacy.

    Purpose:

    • To evaluate the functional effects of construction bite for Andresen-type activators.
    • To assess positional changes of the mandible and hyoid bone.
    • To analyze surface electromyography (EMG) of the anterior temporal (TA) and masseter (MM) muscles during treatment.

    Summary:

    • 14 subjects with anterior crossbite were studied using cephalometric radiographs, electric force scales, and EMG.

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  • Patients were categorized based on hyoid bone movement (Groups O and D) and hyoid-mental spine distance (Types A, B, C).
  • Results showed significant differences in condylar pathways and jaw opening velocity between groups, with Type OC requiring greater force. EMG activity increased in Group D with the activator.

    • Impact:

    • Provides insights into the biomechanical adaptations occurring during activator therapy for anterior crossbite.
    • Highlights the influence of hyoid bone displacement patterns on treatment response.
    • Informs clinical decisions regarding activator use and patient selection for improved outcomes in mixed dentition.