Avaliação in vitro da microdureza do esmalte após a utilização de diferentes tipos de agentes clareadores
The aim of the study is to evaluate the enamel microhardness after the use of different types of bleaching agents, through an in vitro study in bovine teeth. First, 50 bovine incisors without fractures and pigments were selected, cleaned and stored in 0.2% thymol with refrigeration. The roots were s...
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| 格式: | bachelorThesis |
| 语言: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| 在线阅读: | https://repositorio.ufrn.br/handle/123456789/52885 |
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| 总结: | The aim of the study is to evaluate the enamel microhardness after the use of different types of bleaching agents, through an in vitro study in bovine teeth. First, 50 bovine incisors without fractures and pigments were selected, cleaned and stored in 0.2% thymol with refrigeration. The roots were separated from the crown using a carborundum disk, and stored in distilled water in an oven at 37°C. The enamel was flattened with sandpaper of different grits, and the specimens were stored for 24 hours in distilled water. Five indentations were made with a digital microhardness tester HMV- 2T (Shimadzu) and a Knoop type indenter, with a static load of 100 gf, which originated an average of the initial microhardness. The samples were immersed in a black tea solution and stained, 1 hour a day, per 15 days. Afterwards, the samples were randomly divided into 5 experimental groups: Group GC (whitening protocol with 35% hydrogen peroxide and then brushing with conventional toothpaste); Group C (Simulated brushing with Conventional toothpaste); Group PH (Simulated brushing with whitening dentifrice based on 1% hydrogen peroxide); Group S (Simulated brushing with whitening dentifrice based on hydrated silica) and Group CA (Simulated brushing with dentifrice based on activated charcoal). Brushing was performed using a machine, where the samples were immersed in the respective dentifrice of each group in the form of a suspension for 1,000 cycles, simulating 2 months of brushing. After that, the final microhardness was measured, following the same protocol as the initial one, and the data was collected and evaluated using 2-factor analysis of variance of repeated measures (ANOVA) and then Tukey's post hoc analysis. HSD (α = 0.05). A significant decrease in microhardness was observed in all groups (p<.001), except for the CG group. Therefore, it is possible to conclude that the Whitening Gel does not cause a decrease in enamel microhardness, unlike whitening toothpastes. |
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