Avaliação de uma nova formulação de agente clareador sobre a dureza do esmalte: associação do trimetafosfato de sódio ao peróxido de hidrogênio a 35%

• Autor(a) principal: Prette Júnior, Ronaldo Antônio Tolentino [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156762; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-06-12/000902052.pdf
• topic: Clareamento dental; Esmalte dentário; Dureza; Peróxido de hidrogênio; Teeth bleaching

Proposition: The proposition of this study was to evaluate in vitro the addition of sodium trimetaphosphate (TMP) in the concentration of 0.25%, in the presence or not of 0.05% sodium fluoride (NaF), 35% hydrogen peroxide on the hardness of the dental enamel. Materials and methods: Bovine enamel blocks (4 mm x 4 mm, n = 50) were selected through the initial surface hardness (SHI) and divided into five groups (n = 10), according to the treatments: 1) Artificial saliva (SA); 2) hydrogen peroxide 35% (PH); 3) PH + 0.05% NaF (PH/NaF); 4) PH + 0.05% NaF + 0.25% TMP (PH/NaF/TMP) and 5) HP Blue 35% (FGM - Dental Products: HP Blue). Gels and artificial saliva were applied once, during 3 sessions of 40 minutes/session, every 7 days, totaling 21 days. Then, final surface hardness (SHF), percentage of surface hardness loss (%SH) and hardness in cross-section for the calculation of the integrated loss of subsurface hardness (ΔKHN) were determined. Data were submitted to ANOVA followed by the Student-Newman-Keuls test (p < 0.001). Results: The treatments with PH/NaF; PH/NaF/TMP led to lower %SH (27% and 63%) in relation to PH (p < 0.001); The PH/F/TMP group reduced the %SH by ~ 50% and ~ 70% when compared to the PH/F and HP Blue groups (p < 0.001). The analysis of mineral loss in depth (ΔKHN) was lower for enamel blocks treated with HP/NaF/TMP and SA (p < 0.001). Conclusion: It is concluded that addition of 0.25% TMP in a conventional bleaching gel significantly reduced enamel demineralization when compared to its counterpart without TMP