Navegando por Autor "Laurindo, Vinicius Silva"

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    Does the composition of toothpaste affect the tooth resistance to erosion/abrasion processes?
    (CDRR Editors) Luz, Bruna Ribeiro; Silva, Gustavo Henrique Faria; Silva, Marcelo Henrique Pereira Marques da; Laurindo, Vinicius Silva; Seefeldt, Vanessa Borelli; Nahórny, Sidnei; Soares, Luís Eduardo Silva
    This study aimed to evaluate the tooth after brushing with toothpaste containing or not active compounds and with different fluoride concentrations after erosion to establish and compare the effectiveness of each dentifrice in its use. Enamel, E (n=36) and dentin, D (n=36) bovine specimens were treated with artificial saliva (AS - control), fluoridated dentifrice (FD), 8% arginine (AR), and calcium silicate (CS). The samples (n=72) were subjected to cycles of demineralization (orange juice) followed by remineralization (saliva) and then tooth brushing (AR, FD and CS). The above cycle was repeated 3´/day for five days. Micro energy-dispersive X-ray fluorescence spectrometry (µ-EDXRF), roughness testing and scanning electron microscopy (SEM) were performed. The mean of roughness values (Ra, μm) were E-AS, 0.20; E-FD, 0.15; E-AR, 0.18; E-CS, 0.18; D-AS, 0.31; D-FD, 0.30; D-AR, 0.37; D-CS, 0.44. The SEM images showed a clear loss of tooth substance in AS and FD treatments. A significant positive mineral variation was observed on the dentin after brushed with AR (p<0.05). The FD dentifrice minimized the erosive effects of the orange juice. Arginine and calcium silicate could improve dental protection by the deposition of a surface layer of deposits. Different active compounds resulted in diverse degrees of protection regarding the type of substrate. The high concentration of fluoride and the inclusion of active compounds improves the dentifrice protection level.
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    Influence of fluoride characteristics on tooth surface protection in an erosive condition: a multifaceted characterization approach
    (Wiley) Silva, Marcelo Henrique Pereira Marques da; Laurindo, Vinicius Silva; Soares, Luís Eduardo Silva
    Materiais Aplicados (LOMA), Sa ̃o José dos Campos, SP, Brazil Correspondence Luís Eduardo Silva Soares, Universidade do Vale do Paraíba (UNIVAP), Instituto de Pesquisa e Desenvolvimento (IP&D), Laboratório de Odontologia e Materiais Aplicados (LOMA), Av. Shishima Hifumi, 2911, 12244-000, Sa ̃o José dos Campos, SP, Brazil. Email: lesoares@univap.br Funding information Fundaça ̃o de Amparo à Pesquisa do Estado de Sa ̃o Paulo (FAPESP), Grant/Award Numbers: 2005/50811–9, 2007/07984-5; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Grant/Award Numbers: 129321/2017-6, 157543/2018-8 | Vinicius Silva Laurindo BDS | Abstract Objective: To evaluate the effect of fluoride consistency and composition to protect enamel and dentin against the dental erosion. Materials and Methods: Bovine enamel and dentin specimens were treated with arti- ficial saliva, neutral fluoride gel (NFG), acidulated phosphate fluoride gel (AFG), neu- tral fluoride foam (NFF), and acidulated phosphate fluoride foam. The samples were subjected to cycling. Micro energy-dispersive X-ray fluorescence spectrometry, sur- face roughness (Ra), contact angle (CA), and scanning electron microscopy (SEM) were performed. Composition, CA and Ra data were analyzed by ANOVA and multi- ple comparison test (p < 0.05). Results: The dentin protected had a significantly higher mineral content than in the control. Eroded unprotected enamel had higher Ra values than normal surfaces. Fluo- ride treatments increased the Ra in dentin samples. AFG increased the CA in enamel. Fluoride foams increased CA in dentin with reduced mineral loss. SEM analysis found a deposited layer on enamel treated with AFG and remnants of deposits on dentin treated with NFG and NFF. Conclusion: Regardless of the form of application, fluoride provided protection against erosion, however with different levels. Clinical Significance: Applying the adequate fluoride form is relevant since the for- mulations have different effects on both enamel and dentin.