Patent ID: 8616879

Claim:
A delivery system for dispensing potentially reactive or caustic viscous dental material through a metal cannula comprising: a material capsule having a material bore with a constant diameter and an external material capsule surface, the material bore having an entrance end and a dispensing end; an external flange formed on said material capsule adjacent the entrance end; a bisected sidewall apex formed in said material capsule adjacent the dispensing end of the material bore; a radially decreasing transition bore having a continuous smooth transition inner surface, wherein the continuous smooth transition inner surface forms a continuous smoothly decreasing diameter bore adjacent the dispensing end of the material bore and extending from said bisected sidewall apex, said radially decreasing transition bore having a continuous smooth transition inner surface ending in a material delivery bore with an orifice; a radially increasing continuous smooth external material capsule transition surface adjacent the dispensing end of the material bore and extending from said bisected sidewall apex, said radially increasing continuous smooth external material capsule transition surface ending in an external material capsule opening surface with an opening, wherein a gap having an increasing radial dimension progressing from said bisected sidewall apex to the opening is formed between said radially decreasing transition bore having a continuous smooth transition inner surface and said radially increasing continuous smooth external material capsule transition surface; a plurality of radially extending grips having a longitudinal extent in an axial direction placed on the external material capsule opening surface adjacent the opening; internal threads formed within the gap on an internal material capsule opening surface adjacent the opening; and a delivery tip having a metal cannula attaching to said internal threads, whereby the caustic or reactive dental material is intended to be contained separately in said material capsule and prevented from contacting or residing in proximity to the metal cannula prior to being dispensed.