title: Comparison of Intraoperative Blood Loss and Postoperative Pain After Two Different Anterior Mandibular Osteotomies.
abstract: OBJECTIVE
  The aim of this study was to compare intraoperative blood loss and postoperative pain in patients undergoing 2 different procedures for the treatment of bimaxillary protrusion with chin deficiency: anterior subapical osteotomy (ASO) of the maxilla (ASO Mx), ASO of the mandible (ASO Md), and genioplasty (Gep); and ASO Mx, bilateral parasymphyseal osteotomy (BPsO) of the mandible (BPsO Md), and Gep.
  
  
  METHODS
  A 10-cm visual analog scale (VAS) was used to evaluate postoperative pain >2 days in 32 patients who underwent orthognathic surgery. According to osteotomy of mandible, patients were divided into 2 groups: 15 in the ASO group and 17 in the BPsO group. Patient- and operation-related factors (age, blood loss, operation time, and pre and postoperative blood parameters) were assessed, and postoperative pain using VASs were compared between both groups.
  
  
  RESULTS
  Patient- and operation-related factors showed no significant difference in both groups. Mean operation time and blood loss were 406.67 minutes and 388.67 mL in the ASO group, and 447.35 minutes and 365 mL in the BPsO group. Mean VAS scores on the first and second postoperative days were 3 and 1.4 cm in the ASO group, and 2.82 and 1.76 cm in the BPsO group, also indicating no significant between-group differences.
  
  
  CONCLUSIONS
  Intraoperative blood loss and postoperative pain control following orthognathic surgery were within acceptable parameters, with no significant differences between the ASO and BPsO procedures.
authors.affiliation: *Department of Oral and Maxillofacial Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University †Faculty of Oral Hygiene, College of Dental Medicine, Kaohsiung Medical University ‡Department of Family Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
authors.forename: Chun-Ming
authors.initials: CM
authors.lastname: Chen
authors.forename: Chen-Yi
authors.initials: CY
authors.lastname: Lee
authors.forename: Yen-Chun
authors.initials: YC
authors.lastname: Liu
authors.forename: Kun-Jung
authors.initials: KJ
authors.lastname: Hsu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016063:Blood Loss, Surgical; D001803:Blood Transfusion / Q000379:methods; D004906:Erythrocyte Count; D005260:Female; D063172:Genioplasty / Q000379:methods; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D008297:Male; D063168:Mandibular Osteotomy / Q000379:methods*; D063166:Maxillary Osteotomy / Q000379:methods; D061646:Operative Time; D056948:Orthognathic Surgical Procedures / Q000379:methods; D010147:Pain Measurement / Q000379:methods; D010149:Postoperative Pain / Q000209:etiology*; D055815:Young Adult
chemical_list: D006454:Hemoglobins