title: Comparison of skeletal stability after sagittal split ramus osteotomy with and without extraction of the third molar in patients with mandibular prognathism.
abstract: OBJECTIVE
  The purpose of this study was to evaluate, through cephalometric analysis, the skeletal stability following BSSRO performed with and without extraction of the third molar, and to examine the healing of the extraction sockets through computed tomography (CT).
  
  
  METHODS
  Sixty Japanese patients (male: 14, female: 46) diagnosed with mandibular prognathism were included in this study. While 30 patients underwent BSSRO along with extraction of the third molar (extraction group), the other 30 patients underwent BSSRO alone (non-extraction group). Skeletal stability was assessed using axial, frontal, and lateral cephalograms. CT scans were obtained 1 week after surgery and at the 1-year follow-up for all the patients. CT value was measured at the point of the extraction socket on the horizontal plane parallel to the Frankfurt plane using computer software (SimPlant 2011; Materialise Dental, Leuven, Belgium). The region of interest (ROI) was approximately 4 mm(2) and the mean value was recorded. Healing of the extraction sockets was examined through CT 1 year postoperatively.
  
  
  RESULTS
  There were no significant differences between the groups for any of the parameters at any observation interval. In the extraction group, there were significant differences between the values of CT obtained 1 week postoperatively and 1 year postoperatively in the extraction socket (P = 0.0003).
  
  
  CONCLUSIONS
  The results of this study indicate that there is no significant difference in the skeletal stability between BSSRO performed with and without third molar extraction.
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan. Electronic address: amoroi@yamanashi.ac.jp.
authors.forename: Akinori
authors.initials: A
authors.lastname: Moroi
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Kunio
authors.initials: K
authors.lastname: Yoshizawa
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Ran
authors.initials: R
authors.lastname: Iguchi
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Ikawa
authors.initials: I
authors.lastname: Hiroumi
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Kosaka
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Asami
authors.initials: A
authors.lastname: Hotta
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Tsutsui
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Yuriko
authors.initials: Y
authors.lastname: Saita
authors.affiliation: Department of Oral & Maxillofacial Surgery (Chief Professor: Koichiro Ueki), Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi, 409-3898, Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ueki
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery*; D008875:Middle Aged; D008964:Molar, Third / Q000601:surgery*; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods*; D011378:Prognathism / Q000601:surgery*; D014081:Tooth Extraction / Q000379:methods*; D055815:Young Adult
keywords: Extraction of third molar; Sagittal split ramus osteotomy; Skeletal stability