Comparison of chemical composition of packable resin composites by scanning electron microscopy

Abstract

RESUMO COMPARISON OF CHEMICAL COMPOSITION OF PACKABLE RESIN COMPOSITES BY SCANNING ELECTRON MICROSCOPYCOMPARAÇÃO). Methods and Materials: the specimens measured 4mm in diameter and 4mm in thickness. Five specimens were made for each shade of the materials. They were light cured for 40 seconds at a power of 600mW/cm². Subsequently, the specimens were removed from the plates and ground to powder and then pressed into holes measuring 4mm in diameter in a Teflon matrix, using the plates of the same material as base and cover. Specimens were evaluated under SEM with an x-ray detector for the spectroscopic test by energy dispersing. Results: the chemical components found in both materials were practically the same, but in different proportions. Carbon, Oxygen, Aluminum, Silica, Fluoride and Barium were found. Conclusions: the chemical composition of each same material varied according to each shade analyzed . Uniterms: Packable composite; Spectroscopic test; Composite resins. bjetivo: comparar a composição química de duas resinas compostas compactáveis (SOLITAIRE ® , Kulzer, e PRODIGY CONDENSABLE TM , Kerr) em quatro diferentes cores (incisal/extra-light, A2, A3 e B3). Materiais e método: as amostras foram confeccionadas em placas de acrílico transparente com 4mm de espessura. Os materiais foram inseridos e compactados em orifícios de 4mm de diâmetro. Para cada cor de cada material foram confeccionadas 5 amostras, as quais foram fotopolimerizadas durante 40 segundos a uma potência de 600mW/cm². Logo após, estas foram removidas das placas e trituradas até apresentarem uma consistência de pó, foram prensadas, para colocação das diferentes cores em nichos de 4mm de diâmetro de uma matriz de Teflon, tendo como base e cobertura duas placas do mesmo material. As amostras foram montadas em stubs para a metalização, ou deposição de íons, sendo suas imagens importadas ao microscópio eletrônico de varredura com detector de raios X, para o teste de espectroscopia por dispersão de energia. Resultado: foram encontrados Carbono, Oxigênio, Alumínio, Sílica, Flúor, e Bário em diferentes proporções nos materiais estudados.Conclusão: a composição química de um mesmo material variou de acordo com a cor analisada e os componentes químicos encontrados foram praticamente os mesmos, mas em diferentes proporções.

Morphochemical characterization, microhardness, water sorption, and solubility of regular viscosity bulk fill and traditional composite resins

“…Di Francescantonio et al () analyzed the chemical elements and morphology of filler particles of four resins and found large amounts of silicon and other inorganic elements, such as aluminum, fluoride, barium, and zirconia in all samples. Silva, Veeck, Oliveira, and Souza () found that the chemical compositions of four different shades of two bulk fill composites was practically the same and included carbon, oxygen, aluminum, silicon, fluoride, and barium, similar to the present study.…”

Effect of Curing Modes on the Mechanical Properties of Commercial Dental Resin-Based Composites: Comparison between Different LEDs and Microwave Units

“…A difference of 18% was observed when comparing third-generation LEDs and of almost 35% when comparing VALO and Emitter A Fit equipment. More detailed information regarding the material’s composition must be provided by the manufacturer to explain this result since the shade can change the RBC composition [ 26 ].…”