Main Instructor 張毓仁
Department / Institution Orthodontic department/Kaohsiung Chung Gung Memorial Hospital
Classification Research report
「Materials and methods」 7 patients with cleft lips and palate (2 boys, 5 girls, age: 11.7±0.5 years) had Le Fort I osteotomy and fixation of the RED device. The distraction protocol was started with 2 turn (1 mm) a day for 4 weeks, and then 2-months consolidation. We used digital software Audex for cephalometric analysis to measure the maxillary position after distraction immediately, at 6 months, and 1 year after distraction.
「Results and discussion」 Skeletal changes were record by following the horizontal and vertical positions of 2 points (ANS, and A point) registered on the maxilla. The average records showed: ANS (horizontal: 19.9±6.2 mm, vertical: 2.4±4.0 mm), A point (horizontal: 18.1±7.8 mm, vertical: 3.0±5.6 mm). After 1 year, ANS shows backward 3 mm and downward 0.6 mm, and A point shows backward 0.9 mm and forward 0.8 mm. The relapse rete were 15.2% in ANS and 5.0% in A point in horizontal direction.
In these cases, the distraction from RED devices with skeletal anchorage reveal great amount of maxilla advancement and shows less relapse rate after 1 year follow up.
Long-tern Follow-up of Maxilla Advancement with Rigid External Distraction Device(RED)