Atenuação da intensidade de luz e profundidade de polimerização de resinas compostas

Werlang, Jean Felipe Garlet; Dalfovo, Ricardo João; Neiva, Ivana Froede; Obici, Andresa Carla

doi:10.7308/aodontol/2013.49.1.02

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…This technique to smooth and flatten the surface reduces the incorporation of air bubbles into the body of the material. 7,15,21,22,23,24,25 Light curing was performed for 40 seconds on each surface, using halogen light (Foto Optilight LD Max, Gnatus -50/60 Hz), with the active tip of the equipment directly touching the glass slides. 7,19,26 Specimens were removed from the matrix after a 10 minute mean time.…”

Section: Preparation Of Specimensmentioning

confidence: 99%

Surface morphologic evaluation of orthodontic bonding systems under conditions of cariogenic challenge

et al. 2019

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Orthodontic bonding systems are submitted to demineralization and remineralization dynamics that might compromise their surface smoothness, and favor biofilm aggregation and caries development. The aim of the present study was to evaluate the effects of a cariogenic challenge model (in vitro pH-cycling model) on the surface roughness and topography of 3 bonding materials: Transbond TM XT (XT), Transbond TM Plus Color Change (PLUS) and Fuji Ortho TM LC (FUJI), by means of Atomic Force Microscopy (AFM). Six specimens with standardized dimensions and surface smoothness were fabricated per group, and the materials were manipulated in accordance with the manufacturers' instructions. No polishing was necessary. AFM tests were performed before and after pH-cycling, taking 3 readouts per specimen. The roughness results (Ra) were obtained at nanometric levels (nm) and surface records were acquired in two-and three-dimensional images of height and lock-in phase of the material components. The surfaces of all groups analyzed in the study were morphologically altered, presenting images suggestive of matrix degradation and loss of matrix-load integrity. FUJI presented the greatest increase in surface roughness, followed by XT and PLUS, respectively (p≤0.001). Nevertheless, the roughness values found did not present sufficient degradation to harbor bacteria. The surface roughness of all tested materials was increased by pH-cycling. The use of materials capable of resisting degradation in the oral environment is recommended, in order to conserve their integrity and of the surrounding tissues.

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Section: Preparation Of Specimensmentioning

confidence: 99%

Surface morphologic evaluation of orthodontic bonding systems under conditions of cariogenic challenge

et al. 2019

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“…The use of photoactive composite resins has been universalizing for the restoration of anterior and posterior teeth. This is due to the characteristics of the material that mimic adjacent dental tissues 1 . Another characteristic of this material is to undergo polymerization initiated by a photo initiator, a molecule responsible for capturing light, usually canforoquinone and a tertiary amine.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Light Intensity Emitted by the Light-curing Devices of a Dental School Clinic in the North of Brazil: a Pilot Study

et al. 2021

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Photoactivated composite resins are among the most widespread restorative materials in dentistry, particularly in cosmetic dentistry. To obtain the best properties of the material, the resins must have their polymerization reaction initiated by means of the light-curing device, which activates the photoinitiators present in the composites. For this process to occur in the desired way, it is essential that the light-curing device emits light at the intensity necessary to properly activate the photoinitiators. Thus, a pilot study was carried out to assess the light intensity emitted by the light-curing devices used in a school clinic. To assess the light intensity emitted by the devices, a radiometer was used. Twenty-four light-curing devices were evaluated, 13 Optilight Max devices, 8 Optilight LD MAX 440 devices, 3 Emitter C. devices. All the devices had an emitted light below 400 mW / cm² and 67% of the devices had intensity above 300 mW/cm². The average light emission values of the light-curing devices were Optilight Max 334mW/cm², Emitter C 275mW/cm², Optilight LD MAX 440 296mW/cm². It was concluded that no light-curing device emitted light at the recommended intensity (400 mW/cm²), two thirds of the devices emitted light in intensity above the minimum required for photopolymerization of composite resin increments of up to 2mm and one third emitted light in intensity below the required minimum. There was no difference among the light-curing device models tested in this study. Keywords: Photoinitiators, Dental. Dental. Tooth. Composite Resins. ResumoAs resinas compostas fotoativadas estão entre os materiais restauradores mais difundidos em odontologia, particularmente na odontologia estética. Para obtenção das melhores propriedades do material, as resinas precisam ter sua reação de polimerização iniciada por meio do fotopolimerizador, que ativa os fotoiniciadores presentes nos compósitos. Para que esse processo ocorra da forma desejada, é fundamental que o fotopolimerizador emita a luz na intensidade necessária para ativar adequadamente os fotoiniciadores. Assim, foi realizado um estudo piloto para avaliadar a intensidade da luz emitida pelo fotopolimerizadores utilizados em uma clínica-escola. Para avaliar a intensidade da luz emitida pelos dispositivos, foi utilizado um radiômetro. Vinte e quatro fotopolimerizadores foram avaliados, 13 aparelhos Optilight Max, 8 aparelhos Optilight LD MAX 440, 3 aparelhos Emitter C. Todos os dispositivos tiveram a luz emitida em intensidade inferior a 400 mW/cm² e 67% dos dispositivos apresentaram intensidade acima de 300 mW/cm². As médias de valores de emissão de luz dos fotopolimerizadores foram, Optilight Max 334mW/cm², Emitter C 275mW/cm², Optilight LD MAX 440 296mW/cm²Concluiu-se que nenhum fotopolimerizador emitiu luz na intensidade recomendada (400 mW/cm²), dois terços dos aparelhos emitiram luz em intensidade acima da mínima necessária para fotopolimerização de incrementos de resina composta de até 2mm e um terço emitiu luz em intensidade abaixo da mínima necessária. Não houve diferença entre os modelos de fotopolimerizador testados neste estudo. Palavras-chave: Fotoiniciadores Dentários. Dente. Resinas Compostas.

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Atenuação da intensidade de luz e profundidade de polimerização de resinas compostas

Cited by 2 publications

References 27 publications

Surface morphologic evaluation of orthodontic bonding systems under conditions of cariogenic challenge

Surface morphologic evaluation of orthodontic bonding systems under conditions of cariogenic challenge

Evaluation of the Light Intensity Emitted by the Light-curing Devices of a Dental School Clinic in the North of Brazil: a Pilot Study

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