Examinando por Materia "Hydrogen peroxide"

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Acceso abierto
Degrees of staining in dental structures subjected to different types of dental clearing at 48 hours. In vitro study
(Universidad Privada Norbert Wiener, 2021-12-09) Cotrina Vasquez, Luis Alberto; Morante Maturana, Sara Angelica
Dental discoloration has been a longstanding concern for many individuals. However, various methods and agents, such as hydrogen peroxide (HP) and carbamide peroxide (CP), applied either at home or in a dental office, have emerged in dental practice to improve aesthetics. It is essential to consider how these applications may have positive or negative effects on patients. This study aimed to determine the degree of staining in dental structures subjected to different types of dental bleaching over 48 hours. The research was experimental, in vitro, and prospective. The study used 10% carbamide peroxide (CP10), 22% carbamide peroxide (CP22), 35% hydrogen peroxide (HP35), and a control group (CG) not exposed to any bleaching agent, totaling 40 experimental samples (n = 40) divided into groups of 10 test bodies each. The degree of staining in dental structures subjected to different types of bleaching was assessed using a Vita EasyShade Advance 4.0 spectrophotometer over 48 hours. Conclusions: Dental structures exposed to 10% carbamide peroxide exhibited the highest degree of staining, with darker coloration compared to the initial baseline prior to bleaching. Structures exposed to 22% carbamide peroxide showed the lowest degree of staining, retaining a lighter tone compared to the initial baseline. Structures treated with hydrogen peroxide exhibited a moderate degree of staining, with a slightly duller coloration compared to their initial and final color measurements.
Acceso abierto
Dental sensitivity level after office dental cleaning in patients aged 18 to 50 in Lima, 2023
(Universidad Privada Norbert Wiener, 2024-08-16) Flores Vásquez, Jael Stefanny; Huayllas Paredes, Betzabé
Objective: To determine the level of dental sensitivity after in-office teeth whitening in patients aged 18 to 50 years in Lima, 2023. Material and methods: In this study, 40 patients of both sexes, aged between 18 and 50 years, who visited the dental office for in-office whitening treatment, will be selected. The upper arch will be treated with Whiteness HP Maxx, consisting of 35% hydrogen peroxide, and the lower arch will be treated with Power Bleaching Office 37%, consisting of 37% carbamide peroxide. The Visual Analog Scale will be used to measure dental sensitivity. Results: Dental sensitivity was observed after in-office whitening in patients aged 18 to 50 years in Lima using 35% hydrogen peroxide and 37% carbamide peroxide. A significant difference in dental sensitivity levels was found after in-office whitening, depending on the duration of exposure to the bleaching agent. Conclusion: Both 35% hydrogen peroxide and 37% carbamide peroxide caused dental sensitivity, mostly at a mild level. A significant difference in dental sensitivity was observed depending on exposure time and age group.
Acceso abierto
Effect of hydrogen peroxide at 35% with and without LED lamp activation on enamel microhardness
(Universidad Privada Norbert Wiener, 2023-12-05) Luna Oro, Fiorella Estefani; Gómez Carrión, Christian Esteban
This experimental study aimed to compare the effect of 35% hydrogen peroxide with and without the activation of an LED lamp on enamel microhardness. The methodology of this study was experimental, using a sample of 30 teeth, which were measured with the Vickers instrument. The teeth were divided into two groups: Control group: 15 dental pieces exposed to 35% hydrogen peroxide, and the sample group: 15 dental pieces exposed to 35% hydrogen peroxide with the use of an LED lamp. The results, obtained through the parametric t-test, determined that there were minimal differences (p = 0.001) in enamel microhardness between the initial and final values of the enamel exposed to 35% hydrogen peroxide with and without LED light. Therefore, it was concluded that there are no significant differences in the loss of enamel microhardness according to the presence or absence of LED during the tooth whitening with 35% hydrogen peroxide.
Acceso abierto
Whitening effect with 35% hydrogen peroxide and 35% carbamide peroxide on tooth enamel microhardness, in vitro, 2019
(Universidad Privada Norbert Wiener, 2022-02-11) Valle Buendia, Cris Karen; Girano Castaños, Jorge Alberto
Objective: The objective of this experimental research work is to determine and compare the whitening effect of hydrogen peroxide at 35% and carbamide peroxide at 35% on enamel microhardness when subjected to the action of these whitening agents. A total of 51 dental samples were used, divided into 3 groups: 1 control group immersed in isotonic saline solution and 2 experimental groups subjected to the whitening agents according to the manufacturer's instructions. The enamel microhardness was measured using a Vickers durometer, considering the microhardness values of the enamel before and after being subjected to the whitening agents. The statistical test used in this study was the student t-test, which showed a highly significant difference (p<0.05) between the enamel microhardness values before and after exposure to the whitening agents. It was also observed that there is a greater decrease in enamel microhardness when samples are exposed to hydrogen peroxide at 35% compared to samples subjected to carbamide peroxide at 35%.