A simplified approach to the complete porcelain margin.
The technique described produces a metal-ceramic crown exhibiting excellent esthetic qualities and marginal accuracy superior to that achieved on the cast metal margin. A platinum foil apron or refractory dies are not necessary. A precise shoulder preparation, preferably with two master dies, is required. A chamfer with a bevel, a shoulder with a bevel, or chamfer preparations are not suited to this technique. Quantitative evaluation using a measuring microscope showed that a marginal gap on a crown fabricated on an International Bureau of Standards crown die measured 6 microns at the porcelain shoulder and from 17 to 34 microns on a gold margin of the same crown. On a prepared-tooth, rubber-base compression densite die, the marginal gap on the porcelain shoulder was 10 microns.
D003442:Crowns; D001840:Dental Bonding; D003776:Dental Porcelain; D003779:Denture Design; D006047:Gold Alloys; D006801:Humans; D013499:Surface Properties
D006047:Gold Alloys; D003776:Dental Porcelain