Clinical results with titanium crowns fabricated with machine duplication and spark erosion

Abstract

A new method for fabrication of metal crowns has been developed by one of the authors (M.A.). There are two principles involved: machine duplication of models and electric discharge machining. The metal used is pure unalloyed titanium, which is processed as a coping and later covered by a composite resin. In 1986, 205 separate titanium crowns were made on 149 patients. One year later 192 crowns on 137 patients could be examined. Five crowns had been replaced by new ones owing to fracture of the composite resin. In accordance with the CDA quality evaluation system the following results were obtained for the remaining 187 crowns: margin integrity, 186 excellent or satisfactory (99.5%); anatomic form, 185 excellent or satisfactory (98.9%); and surface and color, 181 excellent or satisfactory results (96.8%). The 1-year results are promising, and further follow-up studies will be made.

Effect acidic and alkaline/heat treatments on the bond strength of different luting cements to commercially pure titanium

“…1,2 The fabrication of many dental prosthetic appliances such as metal-frameworks of fixed and removable partial dentures, full crowns and root posts are among the indications of titanium and titaniumbased alloys in dental field. [3][4][5][6] One of the factors that determine the success of implant supported prosthesis is the achievement and maintaining the integrity of the connection between the prosthetic superstructure and the underlying titanium implant. 7 The prosthetic superstructure is either screw retained or cemented to the underlying abutment.…”

Influence of water, loading rate and bonder on the adhesion of porcelain to titanium

“…2 Because of its excellent biocompatible and mechanical properties, titanium was used in 1986 for the first time by dental technicians to produce titanium frameworks for porcelain fused to metal (PFM) crowns. 3 Many studies have been conducted in the dental field to measure and to improve the bond strength between titanium and its veneering ceramic because the adhesion is controlled by oxide formation and residual stress. 4,5 Low fusing ceramics were developed to improve the adhesion of titanium to porcelain.…”

Gold and titanium nitride coatings on cast and machined commercially pure titanium to improve titanium–porcelain adhesion

“…It has therefore been widely used as a material for implants, simple crowns, fixed partial dentures, and removable partial dentures [6][7][8][9]. However, the adhesion between titanium and dental porcelain is poor when compared to the bonding in typical metal-ceramic systems [10,11].…”