Effect of high-intensity curing lights on the polymerization of bulk-fill composites

Daugherty, Mindy M.; Lien, Wen; Mansell, Michael R.; Risk, Douglas L.; Savett, Daniel A; Vandewalle, Kraig S

doi:10.1016/j.dental.2018.06.005

Cited by 62 publications

(47 citation statements)

References 28 publications

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“…Other studies investigating polymerization properties of bulk-fill or conventional composites similarly observed that bulk-fill materials obtained sufficient polymerization properties at 4 mm depth, and increased curing time improved polymerization properties for both bulk-fill and conventional composites. 4 , 15 , 24 …”

Section: Discussionmentioning

confidence: 99%

“…Several independent studies have validated the DOC on bulk-fill composites with the use of different light-curing units, 17 - 19 and the degree of conversion of bulk-fill materials. 4 , 11 , 14 , 16 , 20 - 24 Although a few studies have investigated shear bond strength (SBS) 25 and the μTBS of bulk-fill composites compared to conventional ones, 26 , 27 none have explored the impact of different LED curing units and curing times on the resin-dentin bond strengths and DOC of restorative bulk-fill resin composites. Our study sought to evaluate the effects of polywave (PW) and monowave (MW) LED curing units on the microtensile bond strength (µTBS) of the composites to dentin and on the depth of cure (DOC) of restorative bulk-fill resin composites using two different curing times.…”

Section: Introductionmentioning

confidence: 99%

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Effects of curing modes on depth of cure and microtensile bond strength of bulk fill composites to dentin

et al. 2020

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Effects of curing modes on depth of cure and microtensile bond strength of bulk fill composites to dentin Objectives: To compare the microtensile bond strength (µTBS) and depth of cure (DOC) of bulk-fill composites cured by monowave (MW) and polywave (PW) LED units using different curing times. Methodology: Three composites were tested: Tetric EvoCeram Bulk Fill (TBF), Filtek Bulk Fill (FBF), and Tetric EvoCeram (T; control). Flat dentin surfaces treated with adhesive (AdheSE Universal ® , Ivoclar Vivadent) were bonded with 4 mm cylindrical samples of each bulk-fill composite material (n=6) and cured with monowave (Satelec) or polywave (Bluephase Style) curing units for 10 or 20 seconds. After 24 hours, teeth were sectioned into individual 0.9 mm 2 beams and tested for µTBS. Failure modes were analysed. Moreover, the DOC scrape test (IOS 4090) was completed (n=5) following the same curing protocols. Two-way ANOVA (a=0.05) was performed, isolating light-curing units. Results: For samples cured with the MW light-curing unit, no significant effects were observed in the µTBS results between any of the resin composite brands and the curing times. Conversely, when resins were cured with a PW light unit, a significant effect was observed for TBF resin. In general, bulk-fill composites presented greater DOC and longer curing time resulted in higher DOC for all composites. Conclusion: The µTBS of the composites to dentin was not affected by the curing mode of the resins, except for TBF cured with PW light unit. Bulk-fill composites exhibit greater DOC than conventional resin-based composites.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of curing modes on depth of cure and microtensile bond strength of bulk fill composites to dentin

et al. 2020

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“…These results corroborate with other studies that have also demonstrated an initial direct relation between radiant exposure and double-bond conversion. 14 , 15 Polymerization kinetics theory of light-activated composite resins suggest that the production of free radicals increases with radiant exposure, which is accompanied by an increment in the formation of multiple growth centers and a subsequent increase in the tendency to form a high cross-linked polymer. 16 Also, when materials are subjected to high levels of irradiance, the resulting rise in exothermic heat within the polymeric matrix could provide polymer chains with greater mobility, which would account for a higher degree of conversion observed in composites irradiated with 24 J/cm 2 .…”

Section: Discussionmentioning

confidence: 99%

Effect of radiant exposure and UV accelerated aging on physico-chemical and mechanical properties of composite resins

et al. 2019

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Currently, there is no consensus in terms of defining the minimum radiant exposure values necessary for achieving adequate properties of composite resin. In addition, the long-term influence that radiant exposure has on the properties of composite resins is still questionable. Objective: The objective of this study was to evaluate the effect of radiant exposure and UV accelerated aging on the physico-chemical and mechanical properties of micro-hybrid and nanofilled composite resins. Material and Methods: A nanofilled (Filtek Supreme; 3M ESPE) and a micro-hybrid composite resin (Filtek Z250; 3M ESPE) were investigated under different radiant exposures (3.75, 9, and 24 J/cm2) and UV accelerated aging protocols (0, 500, 1000, and 1500 aging hours). The degree of conversion (DC), flexural strength (FS), modulus (M), water sorption (WS), and solubility (WL) were evaluated. The results obtained were analyzed using two-way ANOVA and Tukey's test. Comparisons were performed using a significance level of α=0.05. Results: The DC, FS, and M were found to be significantly influenced by both radiant exposure and accelerated aging time. The DC and EM increased with radiant exposure in the no-aging group (0-hour aging) for both micro-hybrid and nanofilled composites, whereas no correlation was found after accelerated aging protocols. WS and WL of micro-hybrid and nanofilled composite resins were scarcely affected by radiant exposure (p>0.05), whereas they were significantly reduced by accelerated aging (p<0.001). Conclusions: Although increasing radiant exposure affected the degree of conversion and mechanical properties of micro-hybrid and nanofilled composites, no influence on the hydrolytic degradation of the material was observed. In contrast, UV accelerated aging affected both the physico-chemical and mechanical properties of the composites.

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“…A resina F1-G, também obteve, neste estudo, valor de profundidade de cura recomendado pelo fabricante, porém, apresentou comportamento inferior comparada com as T2 e S2 independente do aparelho de luz. Um resultado parecido foi obtido por (Daugherty et al, 2018) , onde a resina Filtek ficou abaixo dos padrões da ISO-4049. A possível explicação dos resultados inferiores para Filtek em relação a Tetric e a SDR está na composição do material segundo Kaplan (2019).…”

Section: Discussionunclassified

“…Em relação a propriedades como módulo elástico, dureza, retração pós-gel, resistência a tração e a compressão (Schliebe et al, 2016) A diferença encontrada entre as fontes de luz usadas neste estudo pode ser justificada pelo trabalho do (Daugherty et al, 2018) no qual relata que a intensidade de luz e o tempo de exposição são proporcionais a profundidade de cura. Diferente do presente estudo, o trabalho de (Tsujimoto et al, 2017) não alcançou as profundidades recomendadas no tempo de 20 segundos em todos os compósitos utilizados, o que só foi possível no tempo de 40 segundo, reafirmando a importância dos fatores inerentes a fonte de luz.…”

Section: Discussionunclassified

Profundidade de cura das resinas bulk fill variando a fonte de luz

Rocha

Santos-Filho

Dietrich

et al. 2020

RSD

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Analisar a profundidade de cura das resinas do tipo Bulk Fill (Fluida e Pasta) alterando a fonte de luz. 10 tipos de resinas foram analizadas: (P) Pasta: FiltekTM One Bulk Fill (F1), Tetric N-Ceram Bulk Fill (T1); Aura Bulk Fill (A1); OPUS Bulk Fill (O1) e (F) Fluida: FiltekTM Bulk Fill Flow (F2); Tetric N-Flow Bulk Fill (T2); SDR® Plus Bulk Fill Flowable (S2); OPUS Bulk Fill Flow (O2). Foram confeccionados três discos para cada grupo seguindo ISO 4049/2000, através de molde (4x10mm), que foi totalmente preenchido com resina e fotoativado num tempo de 20s, sendo variado a fonte de luz entre Gnatus (G) e Kavo (K). Imediatamente depois as amostras foram removidas e a parte não polimerizada foi retirada com espátula de plástico. A mensuração foi realizada com um micrômetro de precisão ± 0,1mm. Os dados foram analisados usando ANOVA One-Way e ANOVA Two-Way e teste-t com significância de 0,05. Os grupos T1-K, S1-K, F1-K, F1-G, F2-G e T1-G mostraram resultados de profundidade de polimerização compatíveis com recomendações de fabricante. As fontes de luz G e K não apresentaram diferença (p = 0,068), mas entre os grupos (O2-G) (O2-K) (p = 0,004) houve diferença. Não foram encontradas diferenças entre as resinas (P-K p = 0,059), mas houve: grupo (F-K p =< 0,050), entre resinas-K (p =< 0,050), entre grupos (P-G) (F-G) e resinas-G (p =< 0,050). Resinas fluidas (S2 e T2) apresentaram resultados de profundidade de cura superior a outras. A composição do material, assim como o comprimento de onda, pode ter influenciado nos resultados.

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Effect of high-intensity curing lights on the polymerization of bulk-fill composites

Cited by 62 publications

References 28 publications

Effects of curing modes on depth of cure and microtensile bond strength of bulk fill composites to dentin

Effects of curing modes on depth of cure and microtensile bond strength of bulk fill composites to dentin

Effect of radiant exposure and UV accelerated aging on physico-chemical and mechanical properties of composite resins

Profundidade de cura das resinas bulk fill variando a fonte de luz

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