개방교합을 보이는 골격성 III급 성장기 환자에서 Facemask 치료 후 FR III를 이용한 치료 치험례

A 6-year-old boy presented skeletal Cl III vertical facial type, and reversed overjet and anterior open bite. He received orthopedic treatment using a rapid palatal expansion appliance with Facemask. After 1 year of facemask therapy, he showed improvement in anteroposterior Skeletal relation with a normal overjet. However, the vertical relationship worsened a little, and anterior open bite still remained. FR III was used as an orthopedic retainer with lip seal training. After 1 year and 8 months, the skeletal Class I relationship was well maintained, and vertical relationship improved with decrease of the mandibular plane angle and gonial angle. This case report presents and discusses the effect of FR III as an active retainer after facemask treatment.