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Start Over Author "Piva, Evandro" Publisher fapunifesp (scielo)
24 results on '"Piva, Evandro"'

23. Evaluation of irradiance and radiant exposure on the polymerization and mechanical properties of a resin composite

Author

Guillermo GRAZIOLI, Carlos Enrique CUEVAS-SUAREZ, Matías MEDEROS, Elisa DE LEON, Andrés GARCIA, Eliezer ZAMARRIPA-CALDERÓN, Evandro PIVA, Grazioli Pita Guillermo Steven, Universidad de la República, School of Dentistry, Department of Dental Materials, Montevideo, Uruguay., Cuevas Suarez Carlos Enrique, Autonomous University of Hidalgo State, Academic Area of Dentistry, Dental Materials Laboratory, San Agustín Tlaxiaca, Hgo, Mexico., Mederos Gómez Matías, Universidad de la República, School of Dentistry, Department of Dental Materials, Montevideo, Uruguay., De Leon Cáceres María Elisa, Universidad de la República, School of Dentistry, Department of Dental Materials, Montevideo, Uruguay., García Andrés, Universidad de la República, School of Dentistry, Department of Dental Materials, Montevideo, Uruguay., Zamarripa Calderón Eliezer, Autonomous University of Hidalgo State, Academic Area of Dentistry, Dental Materials Laboratory, San Agustín Tlaxiaca, Hgo, Mexico., and Piva Evandro, Universidade Federal de Pelotas – UFPel, School of Dentistry, Department of Restorative Dentistry, Pelotas, RS, Brazil.

Subjects
RESINAS COMPUESTAS, Curing Lights, Dental, Surface Properties, Composite Resins, Polymerization, LUCES DE CURACION DENTAL, Dental Materials, Curing Lights, Fourier Transform Infrared, Flexural Strength, Materials Testing, Spectroscopy, Fourier Transform Infrared, Mechanical Tests, Dental, General Materials Science, POLIMERIZACION, Spectroscopy
Abstract

The objective of the present study was to evaluate the effect of irradiance and radiant exposure on the chemical–mechanical properties of a resin composite. A micro-hybrid resin composite (Clearfil AP-X, Kuraray) was investigated under two different irradiances: low (300 mW/cm2) and high (800 mW/cm2) and radiant exposures: 8 and 16 J/cm2. Four groups, named Low 8 J/cm2, High 8 J/cm2, Low 16 J/cm2, and High 16 J/cm2 were tested, and their flexural strengths, elastic moduli, depths of cure, and degrees of conversion were evaluated. Data were analyzed using two-way ANOVA and Tukey’s test. A multiple linear regression model was used to correlate the irradiance and radiant exposure with dependent variables (α = 0.05). Irradiance and radiant exposure were found statistically significant for all dependent variables. The interaction between the factors was statistically significant only for the degree of conversion and elastic modulus. Group Low 16 J/cm2 exhibited a significantly superior performance in all the evaluated properties. Barring the degree of conversion, no significant differences were observed among the properties evaluated between the Low 8 J/cm2 and High 8 J/cm2 groups. The adjusted R2 values were high for the depth of cure and degree of conversion (0.58 and 0.96, respectively). Both irradiance and radiant exposure parameters play an important role in establishing the final properties of a micro-hybrid resin composite. Irradiance has a greater influence under higher radiant exposures.

Published
2022

24. Pentaerythritol Tetrasalicylate in the Chemical Composition of Root Canal Sealers

Author

Fabrício Aulo Ogliari, Cesar Henrique Zanchi, Mário Alexandre Coelho Sinhoreti, Eliseu Aldrighi Münchow, Evandro Piva, Manuela Gonçalves de Souza e Silva, Rafael Pino Vitti, Piva, Evandro https://orcid.org/0000-0002-5970-5158, and Piva, Evandro/D-2596-2012

Subjects
Mineral trioxide aggregate, Magnetic Resonance Spectroscopy, Base (chemistry), Root canal, 0206 medical engineering, 02 engineering and technology, Pentaerythritol, Root Canal Filling Materials, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Tensile Strength, Spectroscopy, Fourier Transform Infrared, Dentistry, Oral Surgery & Medicine, Ultimate tensile strength, medicine, Fourier transform infrared spectroscopy, Solubility, General Dentistry, chemistry.chemical_classification, mineral trioxide aggregate, salicylate resin, root canal sealer, 030206 dentistry, 020601 biomedical engineering, medicine.anatomical_structure, chemistry, Propylene Glycols, Titanium dioxide, Salicylic Acid, Nuclear chemistry
Abstract

Made available in DSpace on 2019-09-11T20:51:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2018 Resumo O objetivo neste estudo foi sintetizar e avaliar as propriedades físico-químicas de um novo derivado do salicilato em cimentos endodônticos experimentais à base de cálcio. Dois derivados de salicilato foram sintetizados por meio de uma reação de trans esterificação do salicilato de metila com dois diferentes alcoóis (1,3-butilenoglicol dissalicilato-BD e pentaeritritol tetrassalicilato-PT) na proporção molar de 1: 3 e 1:6, respectivamente. Os produtos (BD e PT), foram caracterizados por espectroscopia infravermelho transformada de Fourier (FTIR) e espectroscopia de ressonância magnética nuclear (RMN). Os cimentos experimentais à base de cálcio foram preparados com a mesma pasta catalisadora (60% de MTA, 39% de N-etil o/p toluenosulfonamida e 1% de dióxido de titânio) e quatro concentrações diferentes de BD e PT nas pastas base (40/0 - controle, 35/5, 30/10 e 20/20) com 60% de óxido de bismuto. Os cimentos foram avaliados quanto ao tempo de endurecimento, à solubilidade (24 h, 7, 14 e 28 dias), resistência à tração diametral e ao módulo de elasticidade. Os dados foram analisados por ANOVA um ou dois fatores e as médias comparadas pelo teste de Tukey (p

Published
2018

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