[Experimental study of removable partial denture retention].

This article describes a series of laboratory experiences about the retentive action of different designs of free end removable partial dentures. It reaffirm the classic concept of the better efficiency of the gingival -occlusal arm clasp than the gingival-occlusal ones, the efficiency and benefits of the rough clasp and the important retention of the posterior action clasp. We find also that the classic concepts of direct and indirect retention can be reformulated, in attention than the odem retainers, such as derived from DPI conception, develops an integral concept of retention and a rational system of fixing derived of the retainer design and the abutment preparation.