| 摘要 |
Dental impression material is applied to the surfaces of teeth under pressure and in a direction of flow perpendicular to the underlying tooth surface. The impression material is pushed into the sulci, interstices of teeth and crevices in adjacent tissues which presses air out and prevents formation of voids. The applicator can be an accessory which is frictionally and sealingly received over the tip of a syringe. The distal end of the applicator may contain a vertical flap spaced from the outlet orifice and adjacent side walls, forming a chamber. As the impression material is extruded, it collects in the chamber under pressure. The end wall may be hinged to wipe the material onto surfaces and may be cut into mini-flaps to conform to cusps and adjacent depressions on occlusal surfaces of teeth.
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