[Studies on the retention capability of push-button attachments].

Of nine pushbutton attachments the force was determined which is necessary for separating the elements from each other, from unused state and in regular intervals up to 44000 times. The initial forces were between 3150 p and 775 p. It appears that forces between 400 and 1000 p should be sufficient for the anchorage of partial dentures. It is suggested that the retentive forces of such retentive elements be standardized. In extracoronal attachments, the use of two abutments soldered together is recommended.