Incisor crossbite and repaired unilateral cleft lip and palate: changes in jaw movement and temporalis muscle activity before and after edgewise treatment--case report.
OBJECTIVE
To examine the changes in jaw movement and temporalis muscle activity of a patient with unilateral cleft lip and palate before and after edgewise treatment.


METHODS
Clinical case study.


METHODS
University dental hospital, department of orthodontics.


METHODS
A 12-year 3-month-old male with incisor crossbite, molar malocclusion, and repaired unilateral cleft lip and palate who had completed first-phase orthodontic treatment.


METHODS
This patient was treated with an edgewise appliance. Jaw movement and temporalis muscle activity during the chewing of a hard gummy jelly were recorded at 2 kHz from the sixth to the twentieth stroke before edgewise treatment and after a retention period of 2 years.


RESULTS
Optimum intercuspation of teeth was achieved. The reversed crossing jaw-movement pattern before treatment changed to a normal grinding after treatment. The posterior temporalis muscle on the chewing side exhibited an earlier burst than the contralateral one during chewing at the post-treatment stage, as is observed in cases with good occlusion.


CONCLUSIONS
Improvement in the occlusion using an edgewise appliance is necessary for acquiring a good masticatory function in patients with incisor crossbite, molar malocclusion, and cleft lip and palate.
Miyawaki
S
S
Department of Oral and Maxillofacial Surgery, Nara Medical University, Japan.
Takada
K
K
D002648:Child; D002971:Cleft Lip / Q000601:surgery*; D002972:Cleft Palate / Q000601:surgery*; D003766:Dental Occlusion; D004576:Electromyography; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology*; D008297:Male; D008310:Malocclusion / Q000503:physiopathology / Q000628:therapy*; D008334:Mandible / Q000503:physiopathology*; D008409:Mastication / Q000502:physiology; D008963:Molar / Q000473:pathology; D009967:Orthodontic Appliances; D018704:Orthodontic Retainers; D013703:Temporal Muscle / Q000503:physiopathology*; D014087:Tooth Movement Techniques