Maxillary segmental distraction in children with unilateral clefts of lip, palate, and alveolus.
OBJECTIVE
Alveolar clefts are commonly closed by a bone grafting procedure. In cases of wide clefts the deficiency of soft tissue in the cleft area may lead to wound dehiscence and loss of the bony graft. Segmental maxillary bony transfer has been mentioned to be useful in such cases. Standard distraction devices allow unidirectional movement of the transported segment. Ideally the distraction should strictly follow the dental arch. The aim of this study was to analyze distraction devices that were adapted to the individual clinical situation of the patients. The goal was to achieve a distraction strictly parallel to the dental arch.


METHODS
Six children with unilateral clefts of lip, palate, and alveolus between 12 and 13 years of age were included in the study. The width of the cleft was between 7 and 19 mm. Dental cast models were used to manufacture individual distraction devices that should allow a segmental bony transport strictly parallel to the dental arch. Segmental osteotomy was performed under general anesthesia. Distraction was started 5 days after surgery. All distracters were tooth fixed but supported by palatal inserted orthodontic miniscrews.


RESULTS
In all patients, a closure of the alveolar cleft was achieved. Two patients required additional bone grafting after the distraction procedure. The distraction was strictly parallel to the dental arch in all cases. In 1 case a slight cranial displacement of the transported maxillary segment could be noticed, leading to minor modifications of the following distractors.


CONCLUSIONS
Distraction osteogenesis is a proper method to close wide alveolar clefts. Linear segmental transport is required in the posterior part of the dental arch, whereas in the frontal part the bony transport should run strictly parallel to the dental arch. An exact guided segmental transport may reduce the postoperative orthodontic complexity.
Department of Oral and Maxillofacial Surgery, Medical University Graz, Graz, Austria. wolfgang.zemann@medunigraz.at
Wolfgang
W
Zemann
Margit
M
Pichelmayer
D000293:Adolescent; D000539:Alveolar Process / Q000002:abnormalities* / Q000601:surgery; D001861:Bone Regeneration; D016025:Bone Transplantation / Q000379:methods; D002648:Child; D002971:Cleft Lip / Q000601:surgery*; D002972:Cleft Palate / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000002:abnormalities* / Q000601:surgery; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D056948:Orthognathic Surgical Procedures / Q000295:instrumentation* / Q000379:methods; D019857:Osteogenesis, Distraction / Q000295:instrumentation / Q000379:methods*; D016896:Treatment Outcome