The RPA clasp assemblies are more favorable for protecting the bucco lingual alveoli of the terminal abutments and the residual ridge from resorption than the RPI and RPC clasp assemblies.

• RPA型卡环设计较RPI和传统三臂卡环设计更利于维护末端基牙颊舌侧牙槽骨以及剩余牙槽嵴的健康