Treatment of a horizontal open bite with an invisible multiloop appliance in a girl with tooth trauma.

This case report presents the treatment of a girl with a Class II horizontal open bite and severe crowding with an invisible appliance. She had been in a severe traffic accident at 5 years 10 months of age. Her teeth, especially the mandibular right lateral incisor, canine, and first premolar had ankylosed, and their roots were severely resorbed and fused to the alveolar bone.