title: Evaluation of the hard and soft tissue changes after maxillary advancement with rigid external distractor in unilateral cleft lip and palate induced maxillary hypoplasia.
abstract: BACKGROUND
  Midfacial growth retardation in cleft lip and palate (CLP) cases, is seen in all the three dimensions. Conventionally these cases are managed by orthographic surgery which has a high rate of relapse. The application of the distraction osteogenesis (DO) has revolutionized the management protocol. The aim of the study was to evaluate the efficacy of rigid external distractor (RED) in management of cleft induced maxillary hypoplasia.
  
  
  METHODS
  Ten cases of unilateral CLP between 11 and 20 years of age having gross midfacial deficiency and those who have undergone presurgical orthodontic treatment were included in the study. The cases were operated for Le Fort 1 osteotomy and application of RED. DO was carried out through transnasal traction wires. Clinico-radiological evaluation of presurgical and 1, 6 and 12 months post distraction parameters were statistically analysed by application of paired 't'-test.
  
  
  RESULTS
  There were 4 males and 6 females with a mean age of 15.1 years. The mean distraction carried out was 14.95 mm. There was a significant improvement in all the hard and soft tissue parameters except SNB. Facial profile improvement and stable occlusion was achieved in all the cases.
  
  
  CONCLUSIONS
  Midfacial DO using RED is a versatile procedure where the maxilla can be moved in multiple planes to achieve a functional, aesthetic and occlusal balance. Keeping in view of the significant relapse rate the clinicians are required to plan 15-20% excess amount of distraction.
authors: Professor & Head, Dept of Dental Surgery, Armed Forces Medical College, Pune 411040, India.
authors: N K
authors: NK
authors: Sahoo
authors: Associate Professor, Dept of Dental Surgery, Armed Forces Medical College, Pune 411040, India.
authors: B
authors: B
authors: Jayan
authors: Senior Specialist, Dept of Dental Surgery, Armed Forces Medical College, Pune 411040, India.
authors: I D
authors: ID
authors: Roy
authors: Assistant Professor, Army Dental Centre (R&R), Delhi Cantt 110010, India.
authors: Ajay
authors: A
authors: Desai
keywords: Cleft lip and palate (CLP); Distraction osteogenesis (DO); Rigid external distractor (RED)