Effect of multidirectional glass fibers on the mechanical properties and contraction in experimental composite resins

• Grant number: 13/13805-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2013
• End date: July 31, 2015
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Roberto Ruggiero Braga
• Grantee: Anne Caroline Encilia Bocalon
• Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

This project aims at evaluating the effect of adding glass fibers on the elastic modulus, flexural strength, and polymerization shrinkage of experimental resin composites. Nine composites will be evaluated, three containing fibers E- K (7 - 13 µm in diameter, 1.6 mm long), three containing only barium glass particles (2¼m) and three containing equal volumes of fibers and glass particles. The biaxial flexural test will be performed using a device type " piston on three balls." Shrinkage will be determined using a helium pycnometer to estimate the dimensional change undergone by the materials during polymerization. The values of density will be determined before and after polymerization and shrinkage will be calculated as the the variation between the initial and final volumes. Samples will be tested for normality and homogeneity of variance using Levene's test and Anderson-Darling, respectively. Then the data will be subjected to two-way ANOVA and Tukey's test, with a global significance level of 5%.

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)

BOCALON, ANNE C. E.; MITA, DANIELA; NARUMYIA, ISABELA; SHOUHA, PAUL; XAVIER, TATHY A.; BRAGA, ROBERTO RUGGIERO. Replacement of glass particles by multidirectional short glass fibers in experimental composites: Effects on degree of conversion, mechanical properties and polymerization shrinkage. Dental Materials, v. 32, n. 9, p. E204-E210, SEP 2016. (13/13805-7)

BOCALON, ANNE C. E.; MITA, DANIELA; NATALE, LIVIA C.; PFEIFER, CARMEM S.; BRAGA, ROBERTO R.. Polymerization stress of experimental composites containing random short glass fibers. Dental Materials, v. 32, n. 9, p. 1079-1084, SEP 2016. (13/13805-7)