Crestal Bone Loss Using Different Stud Attachments in Distal Extension Cases

Abstract

Lack of support, stability and retention are the main problems of Kennedy class I cases restored with conventional RPD due to lack of distal abutment. There is lever action resulting from difference in resiliency between the mucoperiosteum and the periodontal ligament, this difference lead to destructive forces on abutments and supporting structures. A rotational movement usually occurs around the fulcrum of the terminal abutments when Functional occlusal load is applied on distal-extension removable partial denture. These phenomenons not only decrease the denture function and cause the patient's discomfort, but also traumatize the supporting tissues of the dentures. (1,2). Lack of stability, minimal retention, periodontally compromised abutment teeth, and unaesthetic clasps are limitation of conventional, nonimplantsupported RPD. These limitations frequently are accompanied by discomfort, accelerated tooth loss,