Introduction to Activator 2 – Functional Orthodontic Appliance for Class II Correction
Activator 2 is an advanced variation of the classical Andresen-Häupl Activator, designed specifically for the treatment of Class II Division 1 malocclusion characterized by a retruded mandible and deep bite.
The appliance provides sagittal control by using a guiding channel and stabilization wires, which reposition the mandible anteriorly, stimulate mandibular growth, and optimize the occlusal relationship through non-invasive orthopedic principles.
Structural Components
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Bimaxillary acrylic body: custom-fitted to the occlusal surfaces of the upper and lower posterior teeth.
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Guiding channel: a mechanical groove that stabilizes the mandible in a forward position during appliance wear.
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Guide wire: ensures sagittal control and limits free mandibular movement compared to the classical Activator.
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Labial bow and anterior springs (optional): provide torque control for upper anterior teeth when needed.
Clinical Indications
Activator 2 is indicated for:
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Skeletal Class II Division 1 malocclusion due to mandibular deficiency.
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Patients with deep overbite and reduced mandibular angle.
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Individuals in the growth spurt phase (ideally 9 to 12 years old).
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Functional therapy cases without major TMJ pathology or craniofacial syndromes.
Mechanism of Action
The therapeutic effect of Activator 2 is based on controlled mandibular posturing and stimulation of condylar growth. When the appliance is in place:
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The mandible is held in an anterior-forward position.
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Functional orthopedic forces stimulate condylar cartilage remodeling and increase mandibular length.
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Upper incisors may retrocline under appliance pressure, while lower incisors are uprighted.
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Posterior vertical eruption is limited, aiding in deep bite correction.
Key Advantages
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Non-invasive and well-tolerated by pediatric patients.
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Removable design allows for better hygiene and wear-time control.
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High efficiency in modifying skeletal discrepancies during active growth.
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Can be followed by fixed appliance phase for occlusal detailing.
Recommended Protocol
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Appliance wear time: 14–16 hours per day, ideally up to 20–22 hours daily.
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Total treatment duration: 9 to 18 months, depending on case severity and growth response.
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Regular monitoring is essential for compliance and functional assessment.
Scientific References
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Graber, T. M., Vanarsdall, R. L., & Vig, K. W. (2012). Orthodontics: Current Principles and Techniques (5th ed.). Elsevier Health Sciences.
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Moyers, R. E. (1988). Handbook of Orthodontics (4th ed.). Year Book Medical Publishers.
Contact Labo Ly Thuong Kiet
Labo Ly Thuong Kiet specializes in high-precision orthodontic appliance fabrication, tailored to exact clinical specifications and patient comfort.
Ms. Dung – 📞 0903.935.908
Mr. Thuan – 📞 0918.155.145
🏢 47 Đường 281 Ly Thuong Kiet, Ward 15, District 11, Ho Chi Minh City
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