RESUMEN
This study sought to quantify the concentration of hydrogen peroxide (HP) in the pulp chamber and evaluate changes on dental permeability after bleaching with 3 HP concentrations (10%, 35%, and 50%). This study was divided into 2 experiments and the bleaching treatments consisted of 3 applications of HP for 30 minutes during a single session. The first experiment tested HP penetration into the pulp chamber of 4 experimental groups (n = 10) of bovine crowns, which were divided by HP concentration: an unbleached control group (0% HP), 10% HP, 35% HP, and 50% HP. Acetate buffer solution was placed into the pulp chamber and after each application of HP. This solution was collected to determine spectrophotometrically the concentration of HP that reached the pulp chamber. The second experiment evaluated dental permeability. Bovine crowns were divided into 3 groups (n = 10). The crowns were connected to a permeability device and the initial permeability was measured at 10 psi. Three different concentrations of HP gels (10%, 35% and 50%) were applied to the buccal enamel surfaces and the dental permeability was measured after the first, second, and third applications of HP. The data were analyzed by 2-way ANOVA and Tukey test (P ≤ 0.05). All concentrations of HP reached the pulp chamber, although no significant differences were noted between the 3 concentrations tested (P > 0.05). However, the increase of dental permeability in the group that received 50% HP was significantly higher than the 10% HP group (P < 0.05). The results indicate that the HP bleaching treatments increased dental permeability.
Asunto(s)
Cavidad Pulpar/metabolismo , Peróxido de Hidrógeno/farmacocinética , Blanqueadores Dentales/farmacocinética , Permeabilidad Dental/efectos de los fármacos , Animales , Bovinos , Esmalte Dental/efectos de los fármacos , Esmalte Dental/metabolismo , Permeabilidad del Esmalte Dental/efectos de los fármacos , Cavidad Pulpar/efectos de los fármacos , Dentina/efectos de los fármacos , Dentina/metabolismo , Permeabilidad de la Dentina/efectos de los fármacos , Colorantes Fluorescentes , Violeta de Genciana , Peróxido de Hidrógeno/administración & dosificación , Peróxido de Hidrógeno/farmacología , Distribución Aleatoria , Espectrofotometría/métodos , Factores de Tiempo , Blanqueadores Dentales/administración & dosificación , Blanqueadores Dentales/farmacología , Corona del Diente/efectos de los fármacos , Corona del Diente/metabolismoRESUMEN
Green pigmentation in teeth is an uncommon condition associated with bilirubin deposits in dental hard tissues. Its occurrence causes anxiety to both child and family. The purpose of this paper is to present a case involving an eleven-year-old girl with green pigmentation of permanent teeth who underwent a liver transplant due to biliary atresia when she was one year old. The reported case confirms the relevance of past medical history in establishing the diagnosis and treatment plan of green teeth.