Abstract: A system for treating teeth and associated tooth structure using a pressurized air propellant mixed with abrasive material includes a manifold which defines air passages leading from the pressurized air source to dispensing chambers which hold the abrasive material. The manifold further provides a convenient structure for mounting a number of the system components. The manifold simplifies assembly of the system and improves the integrity of air passages within the system. The air abrasion system also has a mixing block and continuous purge feature which eliminate crosstalk and backflow problems when switching between abrasive materials. Evacuation apparatus incorporating a cyclone separator is integrally provided with the system which requires minimal regular maintenance and maximizes suction flow through the apparatus.

Abstract: A glue applicator for storing and applying liquid glue. The applicator includes an elongated generally cylindrical body member, a rigid elongated inner core member positioned within the body member, a fibrous tip member, a liquid glue material contained within the body member, and a cap member for sealing the distal end of the body member. The body member includes a squeezable portion of generally elliptical transverse cross-section located adjacent a distal end portion thereof. The inner core member includes portions thereof that are in contact with an inner surface of the body member along the length thereof. The fibrous tip is received in an elongated cavity formed in a distal end portion of the inner core member. A plurality of openings formed through the inner core member permit the passage of liquid glue from the body member therethrough into the cavity so as to contact the fibrous tip member.

Abstract: The improved valve apparatus is particularly useful in connection with fluid filtering using a cartridge. The apparatus includes a valve body with inlet and outlet ports and a rotatable spool mounted in the body. The spool has an angularly affixed seal member which directs fluid flow. When the spool is in one position, fluid is directed along a flow path which includes the inlet port, the cartridge and the outlet port. When the spool is in the other position, fluid is directed along another flow path which includes the ports but which bypasses the cartridge. In that way, the cartridge can be replaced without interrupting continuity of flow.