A new method for denture identification.

Three denture marking methods were performed on specimen plates which were prepared using a heat-cured acrylic resin. The first method (LA) was to place a label into a suitable space on the specimen, and then cover it with autopolymerizing acrylic resin. The second method (DA) was to print the mark directly on the specimen, and then cover it with autopolymerizing acrylic resin. The third method (DB) was to print the mark directly on the specimen, and then cover it with bonding resin. To investigate the durability of these methods, specimens were immersed in NaOCl, denture cleanser, and coffee. Photographs of the specimens were taken and RGB values were measured. Differences in durability were analyzed by Friedman test. The RGB values were significantly different between LA and DB, but those of DA changed little. The results made it clear that DA was a more durable denture marking method than LA--which is a method generally used.