title: Skeletal stability after mandibular setback surgery: comparisons among unsintered hydroxyapatite/poly-L-lactic acid plate, poly-L-lactic acid plate, and titanium plate.
abstract: OBJECTIVE
  The purpose of this study is to compare the time-course changes in condylar long-axis and skeletal stability after sagittal split ramus osteotomy (SSRO) with an unsintered hydroxyapatite (u-HA)/poly-L-lactic acid (PLLA) plate, PLLA plate, or titanium plate.
  
  
  METHODS
  Of 60 Japanese patients diagnosed with mandibular prognathism, 20 underwent SSRO with a u-HA/PLLA plate system, 20 underwent SSRO with a PLLA plate system, and 20 underwent SSRO with a conventional titanium plate system. The time-course changes in condylar long-axis and skeletal stability were assessed by use of axial, frontal, and lateral cephalograms.
  
  
  RESULTS
  Compared with the u-HA/PLLA group, the titanium group showed a significantly greater change in the right condyle angle between initially and 1 month (P = .0105) and intercondylar axes angle between 1 and 3 months (P = .0013). The PLLA group showed a significantly greater change than the titanium group (P = .0043) and u-HA/PLLA group (P = .0002) in terms of ramus inclination between 1 and 3 months; however, there were no significant differences among the 3 groups in the other measurements for each time interval.
  
  
  CONCLUSIONS
  This study suggests that there are no significant differences in postoperative time-course changes among a u-HA/PLLA plate system, PLLA plate system, and conventional titanium plate system.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan. kueki@med.kanazawa-u.ac.jp
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ueki
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Okabe
authors.forename: Mao
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Aya
authors.initials: A
authors.lastname: Mukozawa
authors.forename: Akinori
authors.initials: A
authors.lastname: Moroi
authors.forename: Kohei
authors.initials: K
authors.lastname: Marukawa
authors.forename: Kiyomasa
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Etsuhide
authors.initials: E
authors.lastname: Yamamoto
mesh_terms: D020341:Absorbable Implants; D000293:Adolescent; D000328:Adult; D001672:Biocompatible Materials / Q000737:chemistry*; D001860:Bone Plates; D001863:Bone Screws; D002508:Cephalometry / Q000379:methods; D002680:Chin / Q000473:pathology; D017886:Durapatite / Q000737:chemistry*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology; D019248:Jaw Fixation Techniques / Q000295:instrumentation; D008297:Male; D008334:Mandible / Q000473:pathology / Q000601:surgery*; D008335:Mandibular Condyle / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D008875:Middle Aged; D009295:Nasal Bone / Q000473:pathology; D056948:Orthognathic Surgical Procedures / Q000295:instrumentation / Q000379:methods; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods; D011091:Polyesters / Q000737:chemistry*; D011378:Prognathism / Q000601:surgery; D012189:Retrospective Studies; D012658:Sella Turcica / Q000473:pathology; D014025:Titanium / Q000737:chemistry*; D055815:Young Adult
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; C499699:hydroxyapatite-polylactide; C033616:poly(lactide); D017886:Durapatite; D014025:Titanium