Objective To evaluate thein vivoretentive forces of mandibular complete overdenture with Magfit attach- ments, as well as the relation between the location of magnetic attachments and the retentive forces of the denture.Methods 5 patients were selected and treated with mandibular complete overdentures retained by Magfit EX600 and MD800 attachments. A strainometerwas used to measure the retentive forces in anterior, central and posterior parts of the overdenture before and after magnets were set. The vertical and anterior-upper 60°retentive forces of the overdenture were measured one month later.Results The retentive forces of the overdentures after setting magnets were significantly greater than that before magnets were set (P0·05). The retentive force in verti- cal direction was greater than that in anterior-upper 60°direction (P
