RESUMO
ABSTRACT The purpose of this study was to evaluate the effect of the use of the combined auxiliaries of oral hygiene with whitening agents on the micro-hardness and micro-morphology of dental enamel. Materials and Methods. 40 human incisors were used and sectioned to obtain 4x4mm samples and divided into four study groups. Group 1: Electric brushing with Toothpaste (BTP); Group 2: Electric brushing with Toothpaste+mouthwash (BTP+MW); Group 3: Electric brushing with Toothpaste+whitening pen (BTP+WP); Group 4: Electric brushing with Toothpaste+mouth wash+whitening pen (BTP+MW+WP). Samples were submitted toVickers micro-hardness test and visualized using scanning electron microscopy (SEM). Results. All groups, with the exception of group 1, showed a decrease in micro- hardness values after applying the treatments (p<0.05). Likewise, when comparing the values after the treatments between the groups, significant statistical differences were found in all of comparisons except for those of groups 2 and 4. SEM images showed changes in the morphology in all the study groups with the exception of group 1. Conclusion. Significant changes such as decrease in micro-hardness as well as in the topography of the enamel surface such as elevations, craters, porosities and etching patterns were founded after the use of the combination of auxiliaries of oral hygiene with whitening agents.
RESUMEN El propósito de este estudio fue evaluar el efecto del uso de los auxiliares de higiene oral combinados con agentes blanqueadores sobre la microdureza y la micro-morfología del esmalte dental. Materiales y métodos. Se utilizaron 40 incisivos humanos y se seccionaron para obtener muestras de 4x4 mm los cuales se dividieron en cuatro grupos de estudio. Grupo 1: cepillado eléctrico con pasta de dientes (BTP); Grupo 2: cepillado eléctrico con pasta dental+enjuague bucal (BTP+MW); Grupo 3: cepillado eléctrico con pasta dental+pluma blanqueadora (BTP+WP); Grupo 4: cepillado eléctrico con pasta dental+enjuague bucal+pluma blanqueadora (BTP+MW+WP). Las muestras fueron analizadas por medio de microdurezaVickers y microscopía electronica de barrido (SEM). Resultados. Todos los grupos, con la excepción del grupo 1, mostraron una disminución en los valores de microdureza después de aplicar los tratamientos (p<0.05). Del mismo modo, al comparar los valores después de los tratamientos entre los grupos, se encontraron diferencias estadísticamente significativas en todas las comparaciones, excepto en las de los grupos 2 y 4. Las imágenes de SEM nos muestran cambios en la morfología en todos los grupos de estudio con la excepción del grupo 1 Conclusión. Cambios significativos como la disminución de la microdureza y los cambios en la topografía de la superficie del esmalte, como elevaciones, cráteres, porosidades y patrones de grabado, se encontraron después del uso de la combinación de auxiliares de la higiene oral con agentes blanqueadores.
Assuntos
Humanos , Higiene Bucal , Microscopia Eletrônica de Varredura , Produtos para Higiene Dental e Bucal , Clareamento Dental/tendências , Escovação Dentária , Dispositivos para o Cuidado Bucal Domiciliar , Esmalte Dentário/lesõesRESUMO
OBJECTIVE: The aim of this clinical randomized double-blind split-mouth study was to assess the effectiveness of a 6% hydrogen peroxide with nitrogen-doped titanium dioxide light activated bleaching agent. METHOD: 31 patients were treated with: one upper hemiarcade with a 35% hydrogen peroxide bleaching agent and the other hemiarcade with a 6% hydrogen peroxide. Two applications were completed each treatment session and three sessions were appointed, with one week interval between them. Tooth colour was registered each session and 1 week and 1 months after completing the treatment by spectrophotometer, registering parameters L*, a* and b*, and subjectively using VITA Classic guide. Tooth sensitivity was registered by VAS and patient satisfaction and self-perception result was determined using OHIP-14. Tooth colour variation and sensitivity were compared between both bleaching agents. RESULTS: Both treatment showed a change between baseline colour and all check-points with a ΔE=5.57 for 6% and of ΔE=7.98 for the 35% one month after completing the (p<0.05). No statistical differences were seen when subjective evaluations were compared. Also, no differences were seen in tooth sensitivity between bleaching agents. OHIP-14 questionnaire demonstrated a significant change for all patients after bleaching. CONCLUSIONS: A 6% hydrogen peroxide with nitrogen-doped titanium dioxide light activated agent is effective for tooth bleaching, reaching a ΔE of 5.57 one month after completing the treatment, with no clinical differences to a 35% agent neither in colour change or in tooth sensitivity. CLINICAL SIGNIFICANCE: A low concentration hydrogen peroxide bleaching agent may reach good clinical results with less adverse effects.
Assuntos
Peróxido de Hidrogênio/administração & dosagem , Clareadores Dentários/administração & dosagem , Clareamento Dental/métodos , Adulto , Método Duplo-Cego , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Feminino , Humanos , Peróxido de Hidrogênio/efeitos adversos , Masculino , Satisfação do Paciente , Espectrofotometria , Titânio/administração & dosagem , Titânio/efeitos adversos , Clareamento Dental/efeitos adversos , Resultado do Tratamento , Adulto JovemRESUMO
Introdução e objetivo: Buscou-se quantificar, indiretamente, a liberaçãode oxigênio após a reação química intracoronária, por deslocamentoaxial de fluido em capilares de vidro, adaptados em coroas dentárias.Material e métodos: Coroas bovinas foram acessadas, e foi executadoo tampão cervical e posicionado um capilar de vidro na face externavestibular, contendo um veículo oleoso. Na sequência, foram preparadasquatro associações de clareadores e colocadas em seu interior: G1? perborato de sódio e peróxido de hidrogênio a 3%; G2 ? perborato de sódio e água; G3 ? associação de percarbonato de sódio e peróxidode hidrogênio a 3%; G4 ? associação de percarbonato de sódio eágua destilada. Após serem mantidas por 24 horas, quantificou-se odeslocamento axial do fluido, interpretado como liberação de oxigêniopela reação química. Resultados: Os resultados mostraram umatendência das associações com o peróxido de hidrogênio em promovermaior liberação de oxigênio. Entretanto não houve diferença entre operborato de sódio e o percarbonato de sódio (p > 0,05). Conclusão:Os grupos experimentais não demonstraram diferenças entre si duranteas 24 horas de reação química.
Objective: To indirectly quantify the release of oxygen after intracoronarychemical reaction, by axial displacement of fluid in glass capillariesarranged in dental crowns. Material and methods: Bovine crownswere accessed, the cervical plug was executed and a glass capillarywas placed in the vestibular external face, containing an oily vehicle.Following that, four associations of bleaching were prepared and placedin its interior: G1 ? sodium perborate and hydrogen peroxide 3%; G2? sodium perborate and water, G3 ? sodium percarbonate and hydrogenperoxide 3%; G4 ? sodium percarbonate and distilled water. After beingkept for 24 hours, the axial displacement of the fluid was quantifiedand interpreted as the release of oxygen by the chemical reaction.Results: The results showed a trend of the associations with hydrogenperoxide to promote the release of more oxygen. However, there wasno difference between sodium perborate and sodium percarbonate(p > 0.05). Conclusion: The experimental groups showed no differencesbetween them during the 24 hours of chemical reaction.