Capacidade protetora de dentifrícios no desgaste erosivo de restaurações com resina composta e cimento de ionômero de vidro em dentina: estudo in vitro

• Autor(a) principal: Gonçalves, Diego Felipe Mardegan [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/204014; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-05-29/000914049.pdf
• topic: Abrasão dentária; Erosão dentária; Resinas compostas; Cimentos de ionômeros de vidro; Tooth abrasion

The aim of this in vitro study was to evaluate the stability of the different restorative materials to adjacent dentin submitted to erosive/abrasive challenge with different dentifrices. One hundred and twenty fragments was obtained the bovine incisors were cut and polished. Half of the specimens were restored with resin-modified glass-ionomer (RMGIC) and half with composite resin (RC). After the restorations, a hemiface of each sample was protected with acid-resistant varnish. The two groups were subdivided according to the dentifrice used (n=10): without fluoride (SF negative control), sodium fluoride (NaF - positive control) and stannous fluoride (SnF). The specimens were immersed in the slurry of the toothpaste for 2 min, including 15 s of simulated brushing. The erosive challenge was performed 4x / day for 2 minutes (citric acid 0.05 M, pH 3.2), with an interval of 1 hour during 5 days. After the first and last daily challenge, the specimens were subjected to the abrasive challenge. In sequence, the resistant acid varnish was removed for the Martens hardness (HMV) and elastic modulus (Eit) analyzes of the surface of the restorative material and the adjacent dentin. In addition, the surface topography of the specimens was evaluated in Scanning Electron Microscopy (n = 3). The data were analyzed for normality and submitted to 2-way ANOVA, followed by Tukey's test for multiple comparisons. The comparison between test and control sides was done with the t test. The level of significance was 5%. In relation to the HMV, for the control side, there was only statistical difference in the dentin adjacent to the RMGIC, where the SF had values lower than the NaF and the SnF was similar to the other dentifrices. In the test side, there was no influence of the dentifrices in both dentin of groups; however, for restorative...