P-19. Cytotoxicity Testing of Orthodontic Light-Cured Resins Using Human Skin Model

We examined cytotoxicity levels of orthodontic bonding resins and glassionomer cement irradiated with plasma arc light and conventional halogen light using TESTSKIN (living skin equivalent). Six seconds of plasma arc light and 20 seconds of conventional halogen light irradiation showed similar levels of cytotoxicity. There is no significant difference in the levels of cytotoxicity when irradiated with plasma arc light for 6 seconds or 9 seconds. However, there is a high level of cytotoxicity when irradiated for only 3 seconds with plasma arc light. Therefore when evaluating cytotoxicity levels, necessary irradiation time using plasma arc light should be 9 seconds or more.