Dental set has matrix and patrix with interlocking groove and arm, pin in housing, bolt with front aperture, fitting into recess, and centering bar

摘要

The dental set consists of a matrix (1) fixed to the remaining set of teeth and possessing an omega-sectioned, occlusally open groove (5) into which is inserted a patrix (9) from an occlusal direction with an arm (10) with a cross-section matching that of the groove. The patrix has a closed-ended, cylindrical hollow pin (19) secured in a housing (29) fixed to the replacement tooth. The patrix contains a bolt (24) movably mounted across the arm in which is a front-sided aperture (13) for a centering bar (14) inserted by means of a compression spring. The bolt has a curved end surface (25) for fitting into a recess (8) in the base (7) of the groove.