Pelicans are instruments for extracting teeth and it is generally accepted that they are so named because of the similarity of the claw to the beak of a bird although it appears in different shapes and with variable features. They was used to remove a tooth from the row sideways and with considerable force. The claw went over the tooth and the bolster pressed against the vestibular alveolar bone. To function well two strong and healthy teeth were needed for the bolster to react against. Ouch, more gas please!