DIN 13973-1
DIN 13973-1 Dental materials - Guidance on testing of wear - Part 1: Wear by toothbrushing (ISO/TR 14569-1:2007)
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/2008