Marginal accuracy and geometry of cast titanium copings

Ronald Blackman, Ramon Baez, Nasser Barghi

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


The biocompatibility of titanium with human tissue is well established; its potential as an alternate metal for crown restorations has yet to be fully investigated. This study measured the geometry and accuracy of coping margins cast in Ti, 99.5% chemically pure. Twenty castings with 45-degree facial and 90-degree palatal margins were made by indirect technique with a commercial system using recommended procedures. They were then cemented with ZnPO4 cement. The coping and die assemblies were embedded in resin, sectioned longitudinally, and measured with a microscope at × 50 power. Casting shrinkage was characteristic, particularly along the horizontal axis in the plane of the shoulder. Although horizontal linear shrinkage of 45-degree margins was greater than that for the 90-degree form, the surface of marginal discrepancy was greatest with the 90-degree configuration.

Original languageEnglish (US)
Pages (from-to)435-440
Number of pages6
JournalThe Journal of Prosthetic Dentistry
Issue number4
StatePublished - Apr 1992

ASJC Scopus subject areas

  • Oral Surgery


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