An extracted maxillary human premolar was prepared for 3/4 artificial crown. Ten models of the tooth were made and different combinations of auxiliary retentive components were prepared on each model: proximal and lingual grooves, pins and boxes. For each model an artificial crown was cast cemented to it, mechanically tested for retention and graphed. Pins proved more retentive than grooves, being the latter more retentive when placed asymmetrically more than in symmetrical positioning.
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