title: Skeletal relapse following sagittal split ramus osteotomy advancement.
abstract: BACKGROUND
  Sagittal split ramus osteotomy (SSRO) is an accepted and standard procedure to address mandibular corpus deficiency. The relapse following the mandibular advancement has a negative impact both on clinician and patient.
  
  
  OBJECTIVE
  To analyse the hard tissue changes and to investigate relapse following SSRO advancement procedure.
  
  
  METHODS
  A retrospective review of 21 patients treated by bilateral SSRO advancement at our institute was conducted. Lateral cephalograms obtained at pre-treatment (T1), pre-surgery (T2), 2 months (T3) and 2 years post-surgery (T4) were evaluated by an independent investigator. The data T2-T3 revealed immediate postoperative changes, and T3-T4 revealed skeletal relapse following surgery after 2 years.
  
  
  RESULTS
  Twelve females and nine males with age ranging from 16 to 24 years underwent mandibular advancement. The mean follow-up period was 2 years 7 months ± 4 months. The mean mandibular advancement at pogonion was 5.1 ± 1.25 mm with significant improvement in SNB, ANB, CoGn, maxillo-mandibular differential and SN:GoPg ratio following surgery. Comparison of the outcomes following surgery revealed that the mean relapse at pogonion was 0.2 ± 0.44 mm. B point, mandibular corpus length, anterior and posterior facial height remained stable with no significant relapse following mandibular advancement.
  
  
  CONCLUSIONS
  Sagittal split ramus osteotomy within the range of mandibular advancement is a stable procedure.
authors.affiliation: Department of Dental Surgery, Armed Forces Medical College, Pune, 411040 Maharashtra India.
authors.forename: Nanda Kishore
authors.initials: NK
authors.lastname: Sahoo
authors.affiliation: Department of Dental Surgery, Armed Forces Medical College, Pune, 411040 Maharashtra India.
authors.forename: Balakrishnan
authors.initials: B
authors.lastname: Jayan
authors.affiliation: 15 Corps Dental Unit, C/O 56 APO, Pune, 903515 India.
authors.forename: Ankur
authors.initials: A
authors.lastname: Thakral
authors.affiliation: Department of Dental Surgery, Armed Forces Medical College, Pune, 411040 Maharashtra India.
authors.forename: Vishvaroop
authors.initials: V
authors.lastname: Nagpal
keywords: Mandibular advancement; Relapse; Sagittal split ramus osteotomy