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KMID : 0362720100480110819
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Journal of the Korean Dental Association
2010 Volume.48 No. 11 p.819 ~ p.828
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Berlin standard activator in the treatment of growing patients with mandibular deficiency: Case report
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Lee Seung-Youp
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Abstract
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Activator is a removable functional appliance used for correcting the skeletal Class II malocclusion in children with the mandibular deficiency. Berlin standard activator modified from Andresen activator has following characters; do not cover the palatal surface for tongue space, relief on lingual surface of mandibular incisors and resin capping 1/3-1/2 of crown height on mandibular incisors for preventing labioversion of mandibular incisors, L-hook between maxillary lateral incisor and canine for anterior high pull headgear, relief on mandibular posterior bite block for differential eruption of posterior teeth. Two cases presented here had a mandibular deficiency and slight maxillary protrusion. First case (an 11-year-old girl) treated with Berlin standard activator and anterior high pull headgear for 13 months followed by fixed orthodontic appliance for another 29 months. Second case (a 12-year-old boy) treated with Berlin standard activator for 6 months followed by fixed appliance for another 24 months. Treatment results showed a significant improvement in sagittal skeletal and occlusal relationship without premolar extraction. Mandibular condyles were concentric in TMJ fossa, and masticatory muscle activities were normalized after treatment. In the retention period facial harmony and occlusal stability was maintained.
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KEYWORD
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Class II, Activator, Headgear, Mandibular deficiency, Mandibular growth
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