Maxillary expansion and stability in the orthodontic-surgical treatment of skeletal anterior open bites.
OBJECTIVE
Evaluation of the surgical/orthodontic treatment's stability using rigid internal fixation.


METHODS
Seventeen patients presenting an anterior skeletal openbite, analyzed retrospectively to evaluate stability of surgical-orthodontic treatment using rigid internal fixation: mini plates and screws for maxillary fixation and bicortical screws for the mandible. The surgical procedures were Le Fort I osteotomy and bilateral sagittal split mandibular osteotomy. The patients were classified into 4 groups according to the characteristics described by Ellis (date): Group 1a (n = 4): Class II dental and skeletal malocclusions treated with one piece Le Fort I intrusion osteotomy and bilateral sagittal split mandibular advancement. Group 1 b (n = 4): Class II dental and skeletal malocclusions treated with multisegmental Le Fort I to expand surgically the maxillary width, intrusion osteotomy and bilateral sagittal split mandibular advancement. Group 2a (n = 5): Class III dental and skeletal malocclusions treated with one piece Le Fort I intrusion with/without advancement and bilateral sagittal split mandibular set-back. Group 2b (n = 4): Class III dental and skeletal malocclusions treated with multisegmental Le Fort I, expanding surgically the maxillary width, with/without advancement.
Bianchi
Alberto
A
Oral and Maxillofacial Surgery Unit, S. Orsola-Malpighi Hospital, Bologna. alberto.bianchi@aosp.bo.it
Amadori
Sara
S
Pironi
Marco
M
Marchetti
Claudio
C
D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D005260:Female; D006801:Humans; D019248:Jaw Fixation Techniques / Q000295:instrumentation; D008297:Male; D008312:Malocclusion, Angle Class II / Q000601:surgery / Q000628:therapy; D008313:Malocclusion, Angle Class III / Q000601:surgery / Q000628:therapy; D024343:Open Bite / Q000601:surgery / Q000628:therapy*; D056948:Orthognathic Surgical Procedures; D010155:Palatal Expansion Technique; D012189:Retrospective Studies; D055502:Secondary Prevention; D018709:Statistics, Nonparametric; D055815:Young Adult