Milling cutter for dental implantation with protection of maxillary sinus has thin pilot tip advancing ahead of broad cutting tip and spring-loaded into forward position

摘要

The shank (5) of the pilot needle drill (6) slides in a blind bore in the main milling cutter (7). It is pushed forward by a coil spring (4) and guided by a further spring (14) with a bolt (17) sliding in a groove (16,18). The main cutter has tip cutters (9) and side cutters (10). It is liquid-cooled with internal passages (11) and has calibration marks (12,13) on the sides.