is about billing code for restorative billing code for crowns - single restorations only Classification of Materials Classification of Metals (Source: ADA Council on Scientific Affairs) The noble metal classification system has been adopted as a more precise method of reporting various alloys used in dentistry. The alloys are defined on the basis of the percentage of metal content: high noble - Gold (Au), Palladium (Pd), and/or Platinum (Pt) greater than or equql to 60% (with at least 40% Au); titanium and titanium alloys - Titanium (Ti) greater than 85%; noble - Gold (Au), Palladium (Pd), and/or Platinum (Pt) greater than or equal to 25%; predominantly base - Gold (Au), Palladium (Pd), and/or Platinum (Pt) less than 25% Porcelain/ceramic Refers to those non-metal, non-resin inorganic refractory compounds processed at high temperatures (600ºC/1112ºF and above) and pressed, polished or milled - including porcelains, glasses, and glass-ceramics. Resin Refers to any resin-based composite, including fiber or ceramic reinforced polymer compounds. ISBN:1935201387#CDT 2011-2012 Current Dental Terminology, Chapter 1 crowns - single restorations only crown restoration procedure