Dental restorations

Details Dental restorations Dental restorations

1999-12-20

2001-09-18

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

C501S089000, C501S111000, C501S133000, C106S035000, C106S038300, C106S038900, C433S215000

Reexamination Certificate

active

06291378

ABSTRACT:

This invention relates to a material for use in the fabrication of full or partial dental restorations, including veneers, crowns, inlays, on lays, and bridge structures, hereinafter referred to as dental restorations.
The invention utilises the technique of flame spraying to produce a relatively dense basal layer of a technical ceramic based material which firstly acts a permanent form upon which porcelain can be applied in order to yield ultimate aesthetics of the restoration, and which secondly serves to strengthen the restoration and provide a means for bonding the restoration to a prepared tooth in which the contribution made by the mechanical bonding mechanism is enhanced.
According to the present invention there is provided a high thermal conductivity refractory material for use in the manufacture of dental restorations, said refractory material comprising essentially of an admixture of Silica, Silicon Carbide, Magnesium Oxide, Mono Ammonium Phosphate, and Zircon or Aluminium Oxide, in predetermined proportions by weight.
The refractory material will preferably be formed as an homogenous powder and sealed in moisture resistant material and subsequently preferably mixed with a colloidal silica based solution.
Preferably, the homogenous powder and colloidal silica based solution is formed into a creamy mixture, preferably by means of a vacuum mixer, prior to being cast into a silicone based impression of a prepared tooth so as to form a refractory model of said tooth.
The silica (SiO
2
) content is preferably in the form of fused silica, quartz, cristobalite, or tridymite


REFERENCES:
patent: 5013363 (1991-05-01), Hakamatsuka et al.
patent: 5298200 (1994-03-01), Kubo et al.
patent: 4030542 (1992-03-01), None

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