Physicomechanical and thermal analysis of bulk-fill and conventional composites
| Autor: | José Filipe Bacalhau Rodrigues, Armiliana Soares Nascimento, Rodolfo Henrique Nogueira Torres, Monica Soares de Albuquerque, Kleilton Oliveira Santos, Leonardo José Rodrigues de Oliveira, Eliane Alves de Lima, Pedro Tardelly Diniz Filgueira, Rodivan Braz, Marcus Vinícius Lia Fook, João Batista dos Santos |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Thermogravimetric analysis
Materials science Spectrophotometry Infrared Surface Properties Composite number In Vitro Techniques Composite Resins Thermal expansion 03 medical and health sciences Dental Materials 0302 clinical medicine Differential scanning calorimetry Hardness Materials Testing Transition Temperature General Materials Science Thermal stability 030212 general & internal medicine Composite material Thermal analysis Thermal decomposition Temperature 030206 dentistry lcsh:RK1-715 lcsh:Dentistry Glass transition |
| Zdroj: | Brazilian Oral Research v.33 2019 Brazilian Oral Research Sociedade Brasileira de Pesquisa Odontológica (SBPqO) instacron:SBPQO Brazilian Oral Research, Volume: 33, Article number: e008, Published: 18 MAR 2019 Brazilian Oral Research, Vol 33, Iss 0 (2019) |
| Popis: | The aim of this study was to evaluate the degree of conversion (DC) and the thermal stability of bulk-fill and conventional composite resins. Eleven composite resin samples were prepared to evaluate the DC, Vickers microhardness (VMH), mass and residue/particle loss, glass transition temperature (Tg), enthalpy, and linear coefficient of thermal expansion (CTE) using infrared spectroscopy (FTIR), microdurometer analyses, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dilatometry (DIL). The data were subjected to statistical analysis, with a significance level of 95%. DC and VMH were not influenced by the polymerized side of the sample, and statistical differences were recorded only among the materials. Decomposition temperature, melting, and mass and residue loss were dependent on the material and on the evaluation condition (polymerized and non-polymerized). Tg values were similar between the composites, without statistically significant difference, and CTE ranged from 10.5 to 37.1 (10-6/°C), with no statistical difference between the materials. There was a moderate negative correlation between CTE and the % of load particles, by weight. Most resins had a DC above that which is reported in the literature. TGA, Tg, and CTE analyses showed the thermal behavior of the evaluated composites, providing data for future research, assisting with the choice of material for direct or semidirect restorations, and helping choose the appropriate temperature for increasing the DC of such materials. |
| Databáze: | OpenAIRE |
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