Abstract A multi-section dental flask for denture-making is provided which includes a pair of threaded, longitudinally shiftable pins received in stepped, communicating bores in the anterior region of the primary and closure sections of the flask to permit selective movement of the pins between a position precluding significant relative movement of the flask sections and a position permitting limited degrees of such movement. The pins are shifted to their movement-blocking positions during all preliminary operations of the denture-making process, and thereafter moved to their recessed positions in order to ensure accurate reproduction of the denture model by compensating for the characteristic expansion and contraction of the denture material during hardening thereof. In another embodiment, a flask lid is utilized in conjunction with compression bolts for resiliently holding the resultant three-piece flask together during the curing process without the need for a separate spring compress as has heretofore been required. The flask lid preferably includes a releasably secured metallic ejector block which facilitates dislodgment of the finished denture from the hardened investment material within the flask.
A dental flask comprising: a substantially tubular primary section having opposed open ends; a closure section disposed in covering relationship to one of said open ends; a lid positioned in covering relationship to the other of said open ends, said primary section, closure section and lid being cooperatively configured to define at least a pair of spaced, axial bores extending through the lid, the tubular wall defining said primary section, and said closure section; an elongated internally threaded tubular sleeve removably positioned within each of said bores and having a radial flange in engagement with the face of said lid remote from said primary section; elongated, threaded bolt means positioned within each of said axial bores with the threaded end thereof received within the corresponding sleeve, the disposition of said bolt means serving to draw said closure section, primary section and lid together; spring means positioned about each of said bolt means and engaging the corresponding sleeve for resiliently urging the closure section into closely fitting contact with said primary section.
Claim 2
Dependent Claim
171 words
A dental flask comprising: a substantially tubular primary section having opposed open ends; a closure section disposed in covering relationship to one of said open ends; a lid positioned in covering relationship to the other of said open ends, said primary section, closure section and lid being cooperatively configured to define at least a pair of spaced, axial bores extending through the lid, the tubular wall defining said primary section, and said closure section; an elongated internally threaded tubular sleeve removably positioned within each of said bores and having a radial flange in engagement with the face of said lid remote from said primary section; elongated, threaded bolt means positioned within each of said axial bores with the threaded end thereof received within the corresponding sleeve, the disposition of said bolt means serving to draw said closure section, primary section and lid together; spring means positioned about each of said bolt means and engaging the corresponding sleeve for resiliently urging the closure section into closely fitting contact with said primary section.
Claim 3
Dependent Claim
60 words
The dental flask of claim 1 wherein a pair of said primary section bores are positioned in the forward marginal edge of said primary section, the rearward edge of the latter remote from said primary bores being beveled to present a fulcrum for said closure section, there being elongated connector means extending through said sections and intersecting said beveled edge.
Claim 4
Dependent Claim
27 words
The dental flask of claim 1 wherein said lid includes a heat conductive ejector block releasably positioned on the face of said lid adjacent said primary section.