The effectiveness of different polymerization protocols for class II composite resin restorations

Jong, Lieke C.G. de; Opdam, N.J.M.; Bronkhorst, Ewald M.; Roeters, Joost; Wolke, Joop G.C.; Geitenbeek, Bas

doi:10.1016/j.jdent.2007.02.002

Cited by 17 publications

(12 citation statements)

References 17 publications

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“…23 [25][26][27][28][29] Studies have reported lower conversion and slower cure for the micro-hybrid composite Esthet-X in comparison to other products. [30][31][32] Assuming that 40 s is the longest practical radiation time Esthet-X required a greater radiant exposure to optimize fracture resistance compared to the other tested products. Aside from in resin matrix chemistry differences manufacturers employ different of photoinitiators, accelerators and inhibitors in their products and these impact on polymerization kinetics.…”

Section: Discussionmentioning

confidence: 99%

Initial fracture resistance and curing temperature rise of ten contemporary resin-based composites with increasing radiant exposure

Shortall¹,

Elmahy²,

Stewardson³

et al. 2013

Journal of Dentistry

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Section: Discussionmentioning

confidence: 99%

Initial fracture resistance and curing temperature rise of ten contemporary resin-based composites with increasing radiant exposure

Shortall¹,

Elmahy²,

Stewardson³

et al. 2013

Journal of Dentistry

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“…De Jong et al . [18] demonstrated that with high intensity light-curing units, exposure times of 10s/2 mm increment can be sufficient to obtain under in vitro conditions a high degree of conversion. These data suggest that a 2 mm buildup layering technique may not result in adequate curing of the bottom layer for such a wide range of materials and that manufacturers need to provide quantitative information about the degree of conversion at specific activation times and light intensities for their entire range of resin materials and shades so that the dentist can devise a placement technique that will ensure adequate cure of the bulk of a restoration.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Vickers hardness and depth of cure of six composite resins photo-activated with different polymerization modes

et al. 2012

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Aim:The current in vitro study evaluated Vickers hardness (VK) and depth of cure (hardness ratio) of six resin composites, polymerized with a light-emitting diode (LED) curing unit by different polymerization modes: Standard 20 s, Standard 40 s, Soft-start 40 s.Materials and Methods:Six resin composites were selected for the present study: three microhybrid (Esthet.X HD, Amaris, Filtek Silorane), two nanohybrid (Grandio, Ceram.X mono) and one nanofilled (Filtek Supreme XT). The VK of the surface was determined with a microhardness tester using a Vickers diamond indenter and a 200 g load applied for 15 seconds. The mean VK and hardness ratio of the specimens were calculated using the formula: hardness ratio = VK of bottom surface / VK of top surface.Results:For all the materials tested and with all the polymerization modes, hardness ratio was higher than the minimum value indicated in literature in order to consider the bottom surface as adequately cured (0.80). Curing time did not affect hardness ratio values for Filtek Silorane, Grandio and Filtek Supreme XT.Conclusion:The effectiveness of cure at the top and bottom surface was not affected by Soft-start polymerization mode.

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“…Unidades de LEDs podem ser comparáveis ou terem melhores efeitos que unidades de luz halógena, dependendo do tipo de resina usada (JONG et al, 2007). O espectro de emissão de luz halógena é grande (entre 380 e 510nm, com pico perto de 480nm) (FUJIBAYASHI et al,1998).…”

Section: Discussionunclassified

Influência dos fotopolimerizadores (luz halógena X LED) na resistência à compressão de resinas compostas

Accetta¹,

Filho²,

Weig³

et al. 2008

R. Fac. Odontol. Porto Alegre

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ResumoO objetivo deste estudo foi verifi car a resistência à compressão de três compósitos usados em restaurações diretas (Surefi l -Dentsply; Concept -Vigodent; Esthetx -Dentsply) polimerizados através de dois tipos de aparelhos fotopolimerizadores: um de luz halógena (Gnatus) e outro de diodo emissor de luz (LED) (Gnatus). Foram confeccionados 30 corpos de prova, sendo 10 para cada material, cada um com 4mm de diâmetro por 6mm de comprimento. Cinco corpos de prova de cada material foram polimerizados com luz halógena e cinco com LED. A manipulação e a polimerização dos materiais foram feitas seguindo as instruções dos fabricantes. Após a confecção, os corpos de prova foram levados à máquina de ensaio (Instron 4204) com carga de 5KN e velocidade de 1,0mm/min para o ensaio da resistência à compressão. Os resultados foram submetidos à análise estatística (ANOVA) e indicaram não haver diferença estatisticamente signifi cante entre as médias. Palavras-chave: Resinas compostas; Materiais dentários. AbstractThe purpose of this study was to verify the compression resistance of three composites used in direct restorations (Surefi l -Dentsply; Concept -Vigodent; Esthetx -Dentsply) polymerized through two types of curing lights: halogen (Gnatus) and light emitted diode (LED) (Gnatus). We made 30 bodies of evidence, 10 for each material, with 4mm in diameter by 6mm in length. Five bodies of evidence for each material were polymerized with halogen light and fi ve with LED. The polymerization and manipulation of materials were made following the instructions of manufacturers. After confection, the bodies of evidence were taken from machine test (Instron 4204) with load of 5KN and speed of 1.0mm/min for the test of compression resistance. The results were subjected to statistical analysis (ANOVA) and showed no statistically signifi cant difference between mean.

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The effectiveness of different polymerization protocols for class II composite resin restorations

Cited by 17 publications

References 17 publications

Initial fracture resistance and curing temperature rise of ten contemporary resin-based composites with increasing radiant exposure

Initial fracture resistance and curing temperature rise of ten contemporary resin-based composites with increasing radiant exposure

Evaluation of Vickers hardness and depth of cure of six composite resins photo-activated with different polymerization modes

Influência dos fotopolimerizadores (luz halógena X LED) na resistência à compressão de resinas compostas

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