Objectives: The combination of TiO and HO under light activation constitutes a promising method for disinfection of dental prosthetics and implants, due to production of reactive oxygen species (ROS). The aim of this work was to investigate the organic degradation ability of TiO particles in combination with HO and under light activation utilizing the organic dye rhodamine B (RhB).
Methods: Five different types of TiO particles, consisting of anatase, rutile, or a mixture of these crystalline phases, were combined with HO and RhB, and subsequently exposed to UV (365nm) or visible (405nm) light at an irradiance of 2.1mW/cm.
Results: It was found that rutile in combination with low concentrations of HO (1.0-3.5mM) resulted in a degradation of RhB of 96% and 77% after 10min exposure to 365nm and 405nm light, respectively, which was the highest degradation of all test groups. Control measurements performed without light irradiation or irradiation at 470nm, or without TiO particles resulted in little or no degradation of RhB.
Conclusions: Low HO concentrations (1.0mM-3.5mM) and visible light (405nm) used in combination with rutile TiO particles showed the highest RhB degradation capacity.
Clinical Significance: A combination of TiO particles and HO exposed to low energy UV or high energy visible light has an organic degradation capability that could be utilized in applications to kill or inactivate bacteria on medical devices such as dental implants for treatment against, e.g., peri-implantitis.
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