title: Stability of maxillary advancement using rigid fixation and porous-block hydroxyapatite grafting: cleft palate versus non-cleft patients.
abstract: This study was undertaken to evaluate the stability of maxillary advancement using bone plates for skeletal stabilization and porous block hydroxyapatite (PBHA) as a bone graft substitute for interpositional grafting in cleft and non-cleft patients. The records of 74 patients (41 females, 33 males) who underwent Le Fort I maxillary advancement using rigid fixation and PBHA interpositional grafting were evaluated retrospectively. All patients also underwent simultaneous sagittal split mandibular ramus osteotomies. Patients were divided into 2 groups for study purposes: group 1 consisted of 17 cleft palate patients and group 2 consisted of 57 non-cleft patients. Each group was further subdivided into 2 subgroups based on the concurrent vertical positioning of the maxillary incisors: groups 1a and 2a, where the maxilla underwent 3 mm or more of inferior repositioning, and groups 1b and 2b, where the maxilla underwent minimal vertical change (< or = 1 mm). Presurgery, immediate postsurgery, and longest follow-up lateral cephalometric tracings were superimposed and analyzed to calculate surgical change and long-term stability of results by assessing horizontal and vertical changes at point A, incisor superius, and the mesial cusp tip of maxillary first molar. The average follow-up time in group 1 was 37.9 months (range 12 to 136) and in group 2 was 28.77 months (range 17 to 88). Average maxillary advancement at point A was: group 1a, 5.4 mm; group 1b, 5.25 mm; group 2a, 5.48 mm; group 2b, 5.46 mm. Average relapse at point A was: group 1a, -0.75 mm; group 1b, -1 mm; group 2a, -0.47 mm; group 2b, -0.48 mm. Average horizontal and/or vertical relapse at the central incisors and first molars was 1 mm or less in group 1 and less than 0.5 mm in group 2. Although there was a slightly greater relapse in group 1, no statistically significant difference was observed between the groups. Maxillary advancement with Le Fort 1 osteotomies using rigid fixation and interpositional PBHA grafting during bimaxillary surgery is a stable procedure with good predictability in cleft and non-cleft patients, regardless of the direction of vertical maxillary movement.
authors.affiliation: Baylor College of Dentistry, Baylor University Medical Center, Dallas,Texas, USA.
authors.forename: P
authors.initials: P
authors.lastname: Mehra
authors.forename: L M
authors.initials: LM
authors.lastname: Wolford
authors.forename: J K
authors.initials: JK
authors.lastname: Hopkin
authors.forename: V
authors.initials: V
authors.lastname: Castro
authors.forename: R
authors.initials: R
authors.lastname: Frietas
mesh_terms: D000293:Adolescent; D000328:Adult; D001672:Biocompatible Materials / Q000627:therapeutic use*; D001860:Bone Plates; D018786:Bone Substitutes / Q000627:therapeutic use*; D002508:Cephalometry; D002972:Cleft Palate / Q000601:surgery*; D017886:Durapatite / Q000627:therapeutic use*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000473:pathology / Q000601:surgery*; D008875:Middle Aged; D008963:Molar / Q000473:pathology; D010027:Osteotomy / Q000379:methods; D019340:Osteotomy, Le Fort / Q000295:instrumentation*; D012008:Recurrence; D012189:Retrospective Studies; D013223:Statistics as Topic; D014716:Vertical Dimension
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes; D017886:Durapatite