Oral research in the world today

Collares, Fabrício Mezzomo; Portella, Fernando Freitas; Leitune, Vicente Castelo Branco; Samuel, Susana Maria Werner

doi:10.1590/s1806-83242013000600002

Cited by 37 publications

(26 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The DC, in general, depends on the monomer chemical structure [18,19,31,54,77,78,83,[89][90][91]. However, several polymerization parameters, such as: initiation technique [92], curing time [5], sample thickness [84,93], initiator system and its concentration [31,[94][95][96][97][98], filler content [99], irradiation time [83], and source [83,97] also play a significant role.…”

Section: The Degree Of Conversionmentioning

confidence: 99%

“…Usually, they are powdered and then mixed, in small amounts, with a dry potassium bromide (KBr) powder [18,29,45,59,90,92,[98][99][100][101][102]. In recent works attenuated total reflection (ATR) sampling technique was effectively used for the DC determination [85,91,[103][104][105][106][107][108]. The main advantage of the ATR-FTIR is simplicity in sample processing.…”

Section: Fourier Transformed Infrared (Ftir) Spectroscopymentioning

confidence: 99%

“…Samples are examined directly in the solid or liquid state without further preparation [109,110]. In the case of the real-time experiments, a monomer drop is sandwiched between NaCl or KBr plates and then polymerized directly in a measuring chamber of the apparatus [5,29,31,54,91,108].…”

Section: Fourier Transformed Infrared (Ftir) Spectroscopymentioning

confidence: 99%

“…The dimethacrylate group provides bands in the FTIR spectra at 1637 cm −1 , referring to the C=C stretching vibrations [18,29,54,85,[90][91][92][98][99][100][103][104][105][106][107][108][109][110][111][112][113][114][115][116][117][118][119][120], 948 cm −1 -referring to the =CH 2 wagging and 816 cm −1 -referring to the =CH 2 twisting [112]. Since the peak at 1637 cm −1 is stronger [112], it is most commonly used.…”

Section: Fourier Transformed Infrared (Ftir) Spectroscopymentioning

confidence: 99%

See 3 more Smart Citations

A Guide through the Dental Dimethacrylate Polymer Network Structural Characterization and Interpretation of Physico-Mechanical Properties

Barszczewska-Rybarek

2019

Materials

View full text Add to dashboard Cite

Material characterization by the determination of relationships between structure and properties at different scales is essential for contemporary material engineering. This review article provides a summary of such studies on dimethacrylate polymer networks. These polymers serve as photocuring organic matrices in the composite dental restorative materials. The polymer network structure was discussed from the perspective of the following three aspects: the chemical structure, molecular structure (characterized by the degree of conversion and crosslink density (chemical as well as physical)), and supramolecular structure (characterized by the microgel agglomerate dimensions). Instrumental techniques and methodologies currently used for the determination of particular structural parameters were summarized. The influence of those parameters as well as the role of hydrogen bonding on basic mechanical properties of dimethacrylate polymer networks were finally demonstrated. Mechanical strength, modulus of elasticity, hardness, and impact resistance were discussed. The issue of the relationship between chemical structure and water sorption was also addressed.

show abstract

Section: The Degree Of Conversionmentioning

confidence: 99%

Section: Fourier Transformed Infrared (Ftir) Spectroscopymentioning

confidence: 99%

Section: Fourier Transformed Infrared (Ftir) Spectroscopymentioning

confidence: 99%

Section: Fourier Transformed Infrared (Ftir) Spectroscopymentioning

confidence: 99%

See 2 more Smart Citations

A Guide through the Dental Dimethacrylate Polymer Network Structural Characterization and Interpretation of Physico-Mechanical Properties

Barszczewska-Rybarek

2019

Materials

View full text Add to dashboard Cite

show abstract

“…The unconverted double bonds remaining in the resin arise from at least two situations, namely unreacted monomers or pendant double bonds at the ends of polymer chains 5 . During polymerization the monomer is reduced.…”

Section: Introductionmentioning

confidence: 99%

Influence of dye and nylon fibers on microwave-cured acrylic resin properties

Fortes

Collares

Leitune

et al. 2017

RGO, Rev. Gaúch. Odontol.

View full text Add to dashboard Cite

Objective The aim of this study is to analyze if both color and nylon fibers have an influence on microwave-cured acrylic resin properties. MethodsRectangular and disk-shaped specimens were prepared using acrylic resins; medium pink with and without nylon fibers and colorless without nylon fibers. To obtain the rectangular specimens, a stainless steel die was used with the following dimensions: 64 X 10 x 3 mm (± 0.5mm RESUMO ObjetivoAnalisar se corantes e fibras de nylon influenciam nas propriedades de uma resina acrílica ativada por energia de micro-ondas. MétodosEspécimes retangulares e em forma de disco foram confeccionados em resina acrílica rosa médio com e sem fibras de nylon e incolor sem fibras. Para obter os espécimes retangulares, foi utilizada uma matriz de aço inoxidável com as seguintes dimensões: 64 X 10 X 3 (± 0,5mm) e para obter os espécimes em forma de disco, foi utilizada uma matriz com 50mm (± 0,5mm) de diâmetro e 0,5mm (±0,05mm) de espessura. Os mesmos foram randomizados para formar os grupos controle (acrílico incolor sem fibras) e experimentais (rosa médio com e sem fibras), sendo cada grupo composto por dez (10) espécimes retangulares e cinco (5) em forma de disco. Foram os mesmos então submetidos a seis (6) ensaios (resistência ao impacto izod, n=10; dureza knoop, n=10; temperatura de transição vítrea, n=3; sorção e solubilidade, n=5; grau de conversão, n=1; resistência à flexão e módulo de flexão, n=10). Todas as variáveis foram submetidas à análise de variância seguida pelo teste de comparações múltiplas de Tukey, com nível de significância de 5%.Resultados O grau de conversão foi de 88% para os 3 grupos de resinas e os resultados não mostraram diferença estatisticamente significativa entre os mesmos para cada variável (p>0,05). ConclusãoOs resultados mostraram que o corante e a presença de fibras de nylon em resina acrílica não afetaram as propriedades analisadas nesse estudo.

show abstract