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The ADA Council on Scientific Affairs has finalized a revised classification system for alloys for fixed prosthodontics. The Council revised this classification system based on a review of the scientific literature, particularly with regard to the use of titanium and titanium alloys in dentistry. This Council review appears in a report entitled "Titanium applications in dentistry," which was published in the March 2003 Journal of the American Dental Association.

As indicated in the following table, the Council has placed titanium and titanium alloys, because of their excellent biocompatibility, between high noble and noble alloys in the revised classification system.

Revised Classification System for Alloys for Fixed Prosthodontics
 Classification  Requirement
 High Noble Alloys  Noble Metal Content ≥ 60% (gold+ platinum group*)
and gold ≥ 40%
 Titanium and Titanium Alloys  Titanium ≥ 85%
 Noble Alloys  Noble Metal Content ≥ 25% (gold + platinum group*)
 Predominantly Base Alloys  Noble Metal Content < 25% (gold + platinum group*)

*metals of the platinum group are platinum, palladium, rhodium, iridium, osmium and ruthenium

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