DIN EN ISO 15912:2011-10

In Amendment A1, the requirements and test methods for the appropriateness of the expansion test for Type 1 and Type 2 investments are specified. When tested in accordance with the now adopted amendment to 7.6, the diameter of the cast discs, with respect to the diameter of the pattern from which they were made, shall be: a) no smaller than 99,5 % in the case of Type 1 casting investment materials (that is, those materials for the manufacture of inlays, crowns and other fixed restorations); b) no smaller than 99,0 % in the case of Type 2 casting investment materials (that is, those materials for the manufacture of complete or partial dentures or other removable appliances). This Amendment A1 to the European Standard has been adopted by Technical Committee CEN/TC 55 "Dentistry" (secretariat: DIN, Germany) from the work by ISO/TC 106 "Dentistry". At DIN, the German Institute for Standardization e. V., Working Committee NA 014-00-09 AA "Gipse, Wachse, Einbettmassen" ("Gypsum, waxes, investments") is responsible at the Dentistry Standards Committee (NADENT).