| 摘要 |
A manual extruder and cartridge having interlocking or mating bearing surfaces. The front end or tip portion of a dental material manual extruder is formed with flexible sidewalls to define a snap or friction fit chamber adapted to receive a cartridge containing a supply of dental material. The rear of the chamber is formed with an angled shoulder or bearing surface. A cartridge, adapted to be snap fit, press fit, or friction fit into the chamber has a flange having complementary angled surface so that when a viscous dental material is extruded, the large forces generated cause the angled surfaces of the flange and adjacent shoulder to interlock and prevents the flexible sidewalls of the barrel from separating apart and prohibits the cartridge from becoming unintentionally detached from the manual extruder or being wedged between the flexible sidewalls. |
