Dental impression tray plastics shell space takes molding mass and is supported by metal supporting shell so shells lock together via grooves and flanges when latched home.

摘要

The shell (10) of the tray has an inside space (12) for the molding mass plus tray cup shells of different material than the tray support. The two shells (10,11) join together positively or forcibly via a slidable guide arrangement (16,17,23) and the tray shell (10) flange (16) rides thus into a groove (23) round the inside of the supporting shell (11) wall (22) as enclosed by the second flange (17) at the free outer edge of wall (22) so the two shells lock together in use assisted by the shell (10) outside extension (18) which homes into a wall (22) opening (24) only to latch onto an outside part (25,26) of the supporting shell (11).