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Main Instructor 張毓仁
Department / Institution Orthodontic department/Kaohsiung Chung Gung Memorial Hospital
Classification Research report
「Objective」 In 1997, Polley and Figueroa first introduced the use of RED to treat patients with maxillary hypoplasia by using the dental splint fixed. However, the side effects from dental anchorage advice has been widely discussed. Therefore, the aim of this study is to present the long-tern stability result of LeFort I distraction osteogenesis using RED with transcutaneous skeletal anchorage.
「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)