The mandibular growth and dysfunction in a patient who has been unsuccessfully treated for a severe functional cross-bite are analysed clinically, electromyographically and cephalometrically. The analysis showed that although the occlusal dysfunction was present throughout the active growth period no asymmetric condylar growth changes occurred. The dento-alveolar process was, however, affected by the abnormal mandibular function. Orthodontic treatment of functional cross-bite should be carried out early so that growth may proceed in harmony with a balanced occlusion.
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