Dentistry – Apparatus – Work support
Patent
1998-10-02
2000-08-15
Lewis, Ralph A.
Dentistry
Apparatus
Work support
433223, A61C 1300, A61C 1400
Patent
active
061026972
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a holding device for the manufacture of dental bridges or for connecting adjacent tooth crowns or onlays/inlays, the use thereof for the manufacture of dental bridges and/or for connecting adjacent tooth crowns or onlays/inlays, and a manufacturing process for the manufacture of dental bridges and of connected tooth crowns.
It is known to span tooth gaps, in particular tooth gaps existing between two teeth, by means of a tooth replacement, the so-called dental bridges, which are supported by the residual dentition.
It is also known to manufacture the dental bridges as follows:
A. Negative impressions are taken of the individual bridge abutments, i.e. of the prepared and in particular essentially frustoconically ground teeth. This is done in particular using a silicone-type material or liquid (e.g. CAPSIL.RTM. from Leach & Dillon, Attleboro Mass. 02763 USA). The negative impressions can here be taken directly on the patient or on a plaster model, prepared by the dentist, of the relevant tooth section of the patient.
B. A positive impression of the individual bridge abutments of the negative impression is made using a refractory material. To do this, a composition or liquid capable of solidifying (e.g. CAPVEST.RTM. from Leach & Dillon) is filled into the negative impression, cured and subjected to thermal cycles in order to sinter the composition, e.g. by heating at 700.degree. C. for 10 minutes and then at 1075.degree. C. for 4 minutes.
The refractory material can be formed from a phosphate-bound embedding compound. The phosphate-bound embedding compound contains in the powder of metal oxide, mostly magnesium oxide, phosphates such as ammonium dihydrogen phosphate (NH.sub.4 H.sub.2 PO.sub.4) and expanding quartz modifications. On admission of water, both hydrogen atoms are replaced by the magnesium and the salt of phosphoric acid arises. Upon crystallization, this salt takes up 6H.sub.2 O as water of crystallization. At 200.degree.-250.degree. C., the water of crystallization escapes, and at about 300.degree. C. the NH.sub.4 MgPO.sub.4 loses ammonia (NH.sub.3). This therefore results in red-heat-stable and binding magnesium pyrophosphate (Mg.sub.2 P.sub.2 O.sub.7).
C. Application of a substance (e.g. "CAPTEK.RTM. adesivo" from Leach & Dillon) onto the refractory material in order to facilitate the subsequent application of the alloy for the crowns.
D. Application of a base structure for the crowns onto the specially treated, refractory material. The base structure can in particular comprise an Au-Pt-Pd-Ag alloy (e.g. CAPTEK P.RTM. from Leach & Dillon) which, under the microscope, is seen in the form of differently sized splinters which are bound in particular by a silicone-type material used in the electronics industry. The alloy can be formed in laminas which can have different thicknesses depending on the area of application (e.g. 0.25 mm for front teeth and 0.35 mm for back teeth such as molars and premolars). Upon application, it is ensured that the base structure lies in close contact on the specially treated, refractory material. The shape of the base structure can be stabilized by thermal cycling, e.g. at 1075.degree. C. for 4 minutes. However, there must not yet be complete melting or fusion of the base structure, and instead the splinters can be melted on so that the base structure can be porous.
E. A capillarization material or agent is then applied. This capillarization material (e.g. CAPTEK G.RTM. from Leach & Dillon) comprises in particular an Au-based alloy with hard or hardener metals, or metals for hardening the alloy, which are seen under the microscope in the form of differently sized spheres, in particular after the binder has been removed and the agent atomized (and by melting in an atmosphere of inert gas, e.g. Ar and by spraying). The capillarization material can be formed in laminas, which can have different thicknesses depending on the area of application. The capillarization material is intended to fill or saturate the free spaces of the
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patent: 3277576 (1966-10-01), Kraft
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Casella Anthony J.
Hespos Gerald E.
Lewis Ralph A.
Porco Michael J.
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