title: Pre-arthroplastic and simultaneous mandibular distraction for correction of facial deformity in temporomandibular joint ankylosis.
abstract: BACKGROUND
  In cases of temporomandibular joint (TMJ) ankylosis, interposition arthroplasty allows return of functional jaw movements. In order to improve the facial appearance, distraction osteogenesis is the treatment of choice, and may be timed either as a pre-arthroplastic, simultaneous or post-arthroplastic procedure. This study was planned to compare the treatment outcomes of pre-arthroplastic distraction (PAD) and simultaneous arthroplastic distraction (SAD) to establish the better treatment modality in terms of improvement in function and aesthetics.
  
  
  METHODS
  This prospective randomized experimental study included 20 children and adolescents suffering from facial deformity due to long standing unilateral TMJ ankylosis. They were randomly allocated to the two surgical groups with ten in each group.
  
  
  RESULTS
  Both groups resulted in good facial symmetry and aesthetics. Initially, during the distraction period, mouth opening of SAD group scored less than that of PAD group but became comparable in 30 days. More pain at the distraction site and over the normal TMJ was observed in PAD group. The excursive movements were almost comparable in both the groups.
  
  
  CONCLUSIONS
  We conclude that both procedures are effective in correcting the post-ankylotic deformity and improving function. Although PAD has better control over movement of the distracting segment, the contralateral TMJ may experience pain. SAD requires a shorter management period but is associated with a temporary decrease in function. Also, control of distraction may be difficult and chances of reankylosis are always there.
authors.affiliation: Resident, Department of Oral & Maxillofacial Surgery, King George Medical University, Lucknow, India.
authors.forename: A L
authors.initials: AL
authors.lastname: Chellappa
authors.affiliation: Professor, Department of Oral & Maxillofacial Surgery, King George Medical University, Lucknow, India.
authors.forename: D
authors.initials: D
authors.lastname: Mehrotra
authors.affiliation: Resident, Department of Oral & Maxillofacial Surgery, King George Medical University, Lucknow, India.
authors.forename: K
authors.initials: K
authors.lastname: Vishwakarma
authors.affiliation: Resident, Department of Oral & Maxillofacial Surgery, King George Medical University, Lucknow, India.
authors.forename: N
authors.initials: N
authors.lastname: Mahajan
authors.affiliation: Resident, Department of Oral & Maxillofacial Surgery, King George Medical University, Lucknow, India.
authors.forename: D P
authors.initials: DP
authors.lastname: Bhutia
keywords: Distraction; Pre-arthroplastic; Simultaneous; Temporomandibular joint