Influence of different light sources and photo-activation methods on degree of conversion and polymerization shrinkage of a nanocomposite resin

Costa, Simone Xavier Silva; Martins, L. M.; Franscisconi, P. A. S.; Bagnato, Vanderlei Salvador; Saad, José Roberto Cury; Rastelli, Alessandra Nara de Souza; Andrade, Mauro

doi:10.1134/s1054660x09230066

Cited by 5 publications

(11 citation statements)

References 71 publications

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“…Polymerization is a process by which monomer molecules are converted into a polymer chain (Costa et al, 2009). Polymerization of the common composite monomer bis-glycidyl methacrylate (bis-GMA) takes place when a carbon-carbon double bond (C‚C) forms between two methacrylate groups (Calheiros et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Influence of extended light exposure curing times on the degree of conversion of resin-based pit and fissure sealant materials

Fatima

2014

The Saudi Dental Journal

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Section: Introductionmentioning

confidence: 99%

Influence of extended light exposure curing times on the degree of conversion of resin-based pit and fissure sealant materials

Fatima

2014

The Saudi Dental Journal

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“…3 The polymerization process of a composite resin occurs through the conversion of the monomer molecules of the matrix into a polymer chain. 4 The extent to which the monomer is converted into a polymer is denominated degree of conversion (DC). The polymerization of the monomer BisGMA occurs through the carbon-carbon double bond of the two methacrylate groups.…”

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confidence: 99%

Effect of irradiation times on the polymerization depth of contemporary fissure sealants with different opacities

et al. 2011

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The aim of this study was to evaluate the depth of curing of 10 contemporary blue light-activated dental flowable materials at several opacities, influenced by different irradiation times using FT-IR spectroscopy. Fifty-five specimens (n = 5) with a 5-mm diameter and 1-mm thickness of translucent (Opallis Flow T), yellowed (Master Flow A2; Opallis Flow A2; Natural Flow A2; Fluroshield Yellowed), and opaque materials (Master Flow OA2; Natural Flow O; Opallis Flow OA3.5; Opallis Flow OP; Fluroshield White) were obtained at six curing times (10s, 20s, 30s, 40s, 50s, and 60s) using a high-intensity LED (Coltolux, Coltène/Whaledent). The degree of conversion (DC) (%) was obtained using the Nexus 470 FTIR Spectrometer (Nicolet Instruments, USA). The FTIR-ATR spectra for uncured and cured samples were analyzed using a ZnSe crystal. The top and bottom surfaces of the cured specimens were analyzed to obtain the depth of curing. Two-way ANOVA was used to analyze the data. The highest curing depth was obtained by Natural Flow OA2, while the lowest was shown by Master Flow OA2. The shortest curing time generated similar depths of cure in comparison with the most extensive for Opallis Flow A2 and Fluroshield Yellowed. Therefore, depth of curing, influenced by the irradiation time, was dependent on the materials. Using the Natural Flow OA2 opaque sealant and the 10-s curing time for Opallis Flow A2 and Fluroshield Yellowed may represent alternative approaches to sealing tooth fissures.

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“…In this sense, according to the results presented in [18,[42][43][44][45]. Filtek TM P90 showed the low DC% mean values for both, LED and argon ion laser LCUs used.…”

Section: Discussionmentioning

confidence: 68%

“…Degree of conversion, defined as the percentage of aliphatic C = C bonds converted dimethacrylate monomer present in their polymeric matrices is critical for the optimization of physical and mechanical properties [40], clinical performance, longevity and biocompatibility in order not to cause cytotoxic effects in pulp tissue, an effect attributed to the unconverted monomers that are released uncured matrix [18,41,42].…”

Section: Discussionmentioning

confidence: 99%

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Degree of conversion of different composite resins photo-activated with light-emitting diode and argon ion laser

Messias¹,

Galvão²,

Boaventura³

et al. 2014

Laser Phys.

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This study evaluated the degree of conversion (DC%) of one experimental and different brands of composite resins light-cured by two light sources (one LED and one argon laser). The percentage of unreacted C = C was determined from the ratio of absorbance intensities of aliphatic C = C (peak at 1637 cm −1 ) against internal standards before and after curing: aromatic C-C (peak at 1610 cm −1 ) except for P90, where %C = C bonds was given for C-O-C (883 cm −1 ) and C-C (1257 cm −1 ). ANOVA and Tukey's test revealed no statistically significant difference among Z350 (67.17), Z250 (69.52) and experimental (66.61 ± 2.03) with LED, just among them and Evolu-X (75.51) and P90 (32.05) that showed higher and lower DC%, respectively. For the argon laser, there were no differences among Z250 (70.67), Z350 (69.60), experimental (65.66) and Evolu-X (73, 37), however a significant difference was observed for P90 (36.80), which showed lowest DC%. The light sources showed similar DC%, however the main difference was observed regarding the composite resins. The lowest DC% was observed for the argon laser. P90 showed the lowest DC% for both light-curing sources.

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Influence of different light sources and photo-activation methods on degree of conversion and polymerization shrinkage of a nanocomposite resin

Cited by 5 publications

References 71 publications

Influence of extended light exposure curing times on the degree of conversion of resin-based pit and fissure sealant materials

Influence of extended light exposure curing times on the degree of conversion of resin-based pit and fissure sealant materials

Effect of irradiation times on the polymerization depth of contemporary fissure sealants with different opacities

Degree of conversion of different composite resins photo-activated with light-emitting diode and argon ion laser

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