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Objective: Using a twin block appliance to treat overjet problem in growing child. Methods: Twin-block consists of maxilla and mandible blocks bite with retention 0.7 mm adams clasped on permanent first molars and 0.9 mm balls clasped placed on maxillary and mandibular incisors embrasures. Passive maxillary bow labial used for anterior retention and control the incisors proclination. Lateral expansion of maxillary arch was achieved by expansion screw–controlled once a week. The patient was instructed to use appliance for 24 hours a day, wear and remove the maxillary and mandibular twin-block by himself, activate the screw expansion twice a week and followed up every three weeks. The patient was also instructed to oral hygiene maintenance especially around the covered acrylic plate region. Results: Patient’s profile shapes was improved after 7 months treatment. Crowding mandible reduced by proclination of mandibular incisor, normal occlusion with optimum overbite as well as overjet could be achieved. Conclusions: Twin block appliances was successfully treat the overjet problem in this patient.

Overjet problems at the growing child, case report using the twin block appliance