ESR investigation of ROS generated by H2O2 bleaching with TiO2 coated HAp.
Dent Mater J
; 31(3): 458-64, 2012.
Article
en En
| MEDLINE
| ID: mdl-22673461
ABSTRACT
It is well known that clinical bleaching can be achieved with a solution of 30% hydrogen peroxide (H2O2) or H2O2/titanium dioxide (TiO2) combination. This study examined the hypothesis that TiO2 coated with hydroxyapatite (HAp-TiO2) can generate reactive oxygen species (ROS). ROS are generated via photocatalysis using electron spin resonance (ESR). The bleaching properties of HAp-TiO2 in the presence of H2O2 can be measured using hematoporphyrin litmus paper and extracted teeth. We demonstrate that superoxides (O2(â¢-)) and hydroxyl radicals (HO(â¢)) can be generated through excitation of anatase TiO2, rutile TiO2, anatase HAp-TiO2, and rutile HAp-TiO2 in the presence of H2O2. The combination of R HAp-TiO2 with H2O2 produced the highest level of HO(â¢) generation and the most marked bleaching effects of all the samples. The superior bleaching effects exhibited by R HAp-TiO2 with H2O2 suggest that this combination may lead to novel methods for the clinical application of bleaching treatments.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Titanio
/
Blanqueamiento de Dientes
/
Especies Reactivas de Oxígeno
/
Durapatita
/
Materiales Biocompatibles Revestidos
Límite:
Humans
Idioma:
En
Revista:
Dent Mater J
Año:
2012
Tipo del documento:
Article
País de afiliación:
Japón