title: Changes in posterior airway space and mandibular plane hyoid distance following mandibular advancement DO.
abstract: OBJECTIVE
  To study the changes in posterior airway space (PAS) and mandibular plane hyoid (MPH) distance following mandibular advancement using distraction osteogenesis (DO).
  
  
  METHODS
  A prospective study was conducted at a tertiary care dental center from May 2009 to May 2014. Twenty-five consecutively operated patients of mandibular hypoplasia who underwent mandibular advancement using distraction with at least 12 months follow-up were included in the study. The study group comprised 15 males and 10 females with an age range of 15-30 years (mean 22 years). Presurgical and postsurgical cephalometric changes were compared to determine the changes in PAS and MPH distance.
  
  
  RESULTS
  The mean distraction achieved was 14.50 mm. The mean preoperative MPH was 18.88 mm and mean postoperative MPH was 13.16 mm with a resultant reduction by 32%. Mean preoperative PAS was 6.48 mm and mean postoperative PAS was 11.08 mm. Mean increase in PAS was 75%. Mean preoperative and postoperative SNB values were 75.4° and 79.52°, respectively. The results were statistically analyzed using paired "Student'st-test."
  
  
  CONCLUSIONS
  From this study, it is concluded that statistically significant changes were achieved in MPH and SNB. Although change in PAS was statistically insignificant, it may have clinical applications, especially in the field of Phase II surgical management of obstructive sleep apnea.
authors.affiliation: Army Dental Centre (Research and Referral), New Delhi, India.
authors.forename: Pushpa
authors.initials: P
authors.lastname: Kumari
authors.affiliation: Department of Oral and Maxillofacial Surgery, Army Dental Centre (Research and Referral), New Delhi, India.
authors.forename: S K
authors.initials: SK
authors.lastname: Roy
authors.affiliation: Department of Oral and Maxillofacial Surgery, Army Dental Centre (Research and Referral), New Delhi, India.
authors.forename: Indranil Dev
authors.initials: ID
authors.lastname: Roy
authors.affiliation: Department of Respiratory Medicine, Army Hospital (Research and Referral), New Delhi, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Rajput
authors.affiliation: Department of Orthodontics, Army Dental Centre (Research and Referral), New Delhi, India.
authors.forename: M P
authors.initials: MP
authors.lastname: Prasanna Kumar
authors.affiliation: Department of Orthodontics, Army Dental Centre (Research and Referral), New Delhi, India.
authors.forename: Sanjeev
authors.initials: S
authors.lastname: Datana
authors.affiliation: Army Dental Centre (Research and Referral), New Delhi, India.
authors.forename: Serat
authors.initials: S
authors.lastname: Rahman
keywords: Distraction osteogenesis; mandibular advancement; mandibular plane hyoid distance; posterior airway space