Objective To evaluate clinical effects of combined stup-type attachment and ERA-type attachment foro verdenture in dentition defect.

However, for the ERA attachment which is being used more and more in domestic, there are not so many studies that systematically evaluated its mechanism and the effect of f

Objective:To observe ERA crown cover attachment of the long-term effects of teeth to determine ERA crown cover attachment abutment the scope of choice.

Exploitation and clinical appliance of stud type attachments;

Combined clinical appliance of stud type attachments and extracoronal attachments;