"A careful confidential experiment was conducted at
"The experiment evaluated torque prostheses to laboratory dental implant analogs. The study evaluated the movement of the prior art analog of NOBEL BIOCARE.RTM., as shown in FIG. 9, and the embodiment shown in FIG. 4 of the present invention. Both were torqued to 20 Ncm in a reinforced type IV die stone. 80 analogs were divided into groups of 4 analogs, including three of the prior art analog shown in FIG. 9 with one of the present invention shown in FIG. 4. These analogs were embedded in thirty equal blocks of Type IV plaster stone using a prefabricated four unit implant framework. Of the twenty analogs, ten were imbedded in the stone at a depth of four cm and ten were imbedded at a depth of six cm from the implant platform. These groups of ten were then divided into groups of five each, where five of the prior art analogs shown of the present invention in FIG. 9 were torqued to 20 Ncm in each group and five analogs shown in FIG. 4 were torqued to 20 Ncm. The initial framework was used to evaluate the fit of each analog therein. In the 4 mm depth group of the prior art shown in FIG. 9, two of the five samples (40%) did not allow the framework to fit the analog. In the 6 mm depth of the prior art analogs shown in FIG. 9, three of the five samples (60%) did not allow the framework to fit. However, all of the dental analogs shown in FIG. 4 of the present invention fit back to the cast.
"As a result, the analogs of the present invention, as shown in FIG. 4, were able to resist movement within a stone cast when torqued, unlike a significant portion of the prior art dental analogs shown in FIG. 9.
"Therefore, the dental analogs of the present invention have unexpected, beneficial results not achievable with the dental analogs of the prior art shown in FIG. 9.
"A method of preparing dental crowns efficiently and accurately, includes the steps of:
"a. preparing an analog for a jaw implant supporting a dental crown mounting pin having at least one anti-rotation anchoring projection extending discretely and radially from said pin adjacent a bottom end thereof;
"b. inserting bottom-end-down said prepared mounting pin into a dental crown casting mold;
"c. securing said prepared mounting pin temporarily in place within said casting mold;
"d. adding settable plaster or plastic molding material to said casting mold so as to embed said bottom end of said pin by surrounding said bottom end of said pin with said plaster or plastic molding material;
"e. allowing said plastic molding material to set and harden with said prepared pin embedded within said molding material; and
"f. utilizing said embedded mounting pin to make a dental crown.
"Regarding the alternative method described in the previous section using a resin model of a patient's jaw, the analogs used must be resistant to pull-out and rotation as in the method using the stone plaster method. Whether the resin model is a product of stereolithography or otherwise fabricated, it is drilled to accept an analog post. The alternate embodiment of this invention describes analog posts with features for robustly grasping the side walls of these retaining holes in the resin model. Clearly, transverse or radially protruding features cannot be appended to the analog posts since these would not be compatible with insertion.
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