It is a kind of clasp which is often used to free the abutment of the missing tooth, and has the function of stress interruption. In this case, because the distal bracket is not connected with the base, the force is directly transmitted to the mucosa and jaw through the artificial tooth and the base, thus reducing the burden of the abutment and playing the role of stress interruption. This design is helpful to protect abutment, reduce abutment stress, improve abutment stability and maintain the health of surrounding tissues. Pull-back clasp is a common equipment in the field of dental restoration and denture, which improves the effect of dental restoration and the oral health of patients to a certain extent.