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功能性Ⅲ类错牙合畸形又名假性Ⅲ性合畸形是安氏Ⅲ类错颌畸形的一种。 FR －Ⅲ型矫治器常用于矫治功能性Ⅲ类错牙合畸形，尤其适用于儿童。本文对 FR－Ⅲ在矫治功能性Ⅲ类错牙合畸形方面的应用进行详细论述。“,” Functional class III malocclusion deformity is also know n as false III of class Ⅲ malocclusion a deformity .FR - Ⅲ appliance is commonly used in the treatment of functional class III malocclusion ,especially suitable for children .This paper discusses in detail the ap-plication of FR - in the treatment of functional class III malocclusion .