4 documents found, page 1 of 1
Photoelastic evaluation of the effect of composite formulation on polymerizatio...
Oliveira,Karla Mychellyne Costa; Consani,Simonides; Gonçalves,Luciano Souza; Brandt,William Cunha; Ccahuana-Vásquez,Renzo AlbertoWe compared polymerization stress in two commercial composites and three experimental composites made using camphorquinone (CQ) and/or phenylpropanedione (PPD) as photoinitiators. The internal surfaces of photoelastic resin discs with cylindrical cavities were roughened and treated with adhesive. Composites were divided into five groups: two commercial composites (Filtek Silorane and Filtek Z250) and three expe...
The effect of iron on Streptococcus mutans biofilm and on enamel demineralization
Ribeiro,Cecília Cláudia Costa; Ccahuana-Vásquez,Renzo Alberto; Carmo,Cadidja Dayane Sousa do; Alves,Cláudia Maria Coêlho; Leitão,Tarcísio JorgeIron (Fe) may have an anticaries effect by specific inhibition of glycosyltransferase (GTF) enzymes of Streptococcus mutans, but this hypothesis has not yet been clarified. In this study, S. mutans biofilms were formed on blocks of bovine dental enamel of a predetermined surface hardness (SH). These biofilms were exposed eight times/day to 10% sucrose, and two times/day they were subjected to one of the followi...
S. mutans biofilm model to evaluate antimicrobial substances and enamel deminer...
Ccahuana-Vásquez,Renzo Alberto; Cury,Jaime AparecidoThe aim of this study was to validate a model of S. mutans biofilm formation, which simulated 'feast-famine' episodes of exposure to sucrose that occur in the oral cavity, showed dose-response susceptibility to antimicrobials and allowed the evaluation of substances with anticaries potential. S. mutans UA159 biofilms were grown for 5 days on bovine enamel slabs at 37°C, 10% CO2. To validate the model, the biofi...
Polarization of dental caries among individuals aged 15 to 18 years
Hugo,Fernando Neves; Vale,Glauber Campos; Ccahuana-Vásquez,Renzo Alberto; Cypriano,Silvia; Sousa,Maria da Luz Rosário deOBJECTIVE: To evaluate the role of socioeconomic variables and self-perceived oral health in the polarization of caries among adolescents in Santa Bárbara D'Oeste, Brazil. MATERIAL AND METHODS: Cross-sectional study. Sampling was randomized and sample size was defined according to WHO criteria. Two hundred and seventy seven adolescents (15 to 18 year-old) were examined by five trained examiners that assessed DM...