Protective capacity of toothpaste in dental erosion of composite resin and glass ionomer cement restorations in dentin: an in vitro study

• Grant number: 17/11742-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2017
• End date: August 31, 2018
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Ticiane Cestari Fagundes
• Grantee: Diego Felipe Mardegan Gonçalves
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

The aim of this in vitro study will be to evaluate the stability of the different restorative materials to adjacent dentin submitted to erosive/abrasive challenge, with different toothpastes. One hundred and twenty dentin specimens will be obtained from the bovine incisors (4x4 mm) and polished. Half of the specimens (n=30) will be restored with resin-modified glass-ionomer cement and other half with composite resin (n=30). After the restorations, hemiface of the specimens will be protected with resistant acid varnish. These two groups will be subdividied into three subgroups according to the toothpaste that will be used (n=10): toothpaste fluoride-free (control), toothpaste with sodium fluoride (NaF) and toothpaste with stannous fluoride (SnF2). Next, the specimens will be submitted to erosive/abrasive challenge, by immersing in the toothpaste slurry for 2 min, including 15 s of simulated brushing. Challenges of the erosion will be performed 4x/day for 2 minutes, with interval of the one hour during 5 days. The treatment with dentifrices will be performed 2x/day, before and after of the each erosive cycle. In sequence, the resistant acid varnish will be removed of the surface of each sample and analyzed for the Martens hardness and elastic modulus of the restorative material and adjacent dentin. Scanning electron microscopy will be performed in three representative specimens of each group, with the purpose of illustrate the wear achieved between the control side and test side, as well as in dentin and restorative materials. The data will be analyzed to normality and in case of normal distribution, will be submitted to two way analysis of variance (ANOVA) cand Tukey test for multiple comparisons. The significance level will be 5%. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MARDEGAN GONCALVES, DIEGO FELIPE; FRAGA BRISO, ANDRE LUIZ; PAVESI PINI, NUBIA INOCENCYA; MODA, MARIANA DIAS; DE OLIVEIRA, RENATA PARPINELLI; DOS SANTOS, PAULO HENRIQUE; FAGUNDES, TICIANE CESTARI. Effects of dentifrices on mechanical resistance of dentin and restorative materials after erosion and abrasion. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 97, p. 7-12, SEP 2019. (17/11742-9)