Fenômenos Relacionados a Fotoativação dos Compósitos Restauradores Odontológicos

Guiraldo, Ricardo Danil; Berger, Sandrine Bittencourt; Consani, Símonídes; Oliveira, Gustavo Gomes de; Mendes, Wilson Batista

doi:10.18256/2238-510x/j.oralinvestigations.v3n1p10-16

Cited by 3 publications

(4 citation statements)

References 22 publications

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“…This result could encourage better use of energy equipment in the photoactivation of camphoroquinone 27 Comparing the present results with the data found in the literature is difficult because most of the previous studies 12,22,24,27,30,31 evaluated thermal variations during composite photopolymerization in different remaining dentin thicknesses and/or composite insertions performed with only one photoactivation, which does not take heat accumulation throughout the restorative procedure into consideration, when at least two photoactivations are necessary (both adhesive and composite photopolymerizations). However, it is also necessary to consider the use of new equipment for curing, mainly due to the energy achieved by those devices.…”

Section: Resultsmentioning

confidence: 69%

“…Previous studies [11][12][13][14] thickness and quality of the remaining dentin also influence intrapulpal temperatures 16 . Possible thermal injuries are minimized by the dentin tissue, since it presents low thermal conductivity 17 .…”

Section: Introductionmentioning

confidence: 99%

“…Possible thermal injuries are minimized by the dentin tissue, since it presents low thermal conductivity 17 . However, cavities containing a minimal thickness of remaining dentin are subject to a significant increase in thermal diffusion, thereby facilitating pulpal injury 12,18,19 .…”

Section: Introductionmentioning

confidence: 99%

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Composite Photopolymerization: Temperature Increase According To Light Source And Dentin Thickness

Palma‐Dibb

Savaris

Chinelatti

et al. 2016

JDOI

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When a composite resin restoration is photopolymerized, a considerable amount of heat can be produced, potentially causing pulpal injury. Objective: Evaluate the influence of the type of light source and remaining dentin thickness on the temperature increase in the pulp chamber while curing composite resin restorations. Material and Methods: Ninety-six tooth fragments obtained from bovine incisors were divided into groups/ subgroups (n=12), according to the light source (LED and halogen light) and remaining dentin thickness (3.5, 3, 2, and 1mm). Class I cavities were prepared and restored with a composite resin. A temperature increase was obtained during photopolymerization of the adhesive and each composite increment. Data were analyzed using ANOVA and Fisher's Test (α=5%). Results: LED promoted higher temperature increments when compared with the halogen light. Temperature levels were the lowest for 3.5mm-thick and the highest for 1mm-thick remaining dentin. Levels registered during the photopolymerization of each composite increment were superior for LED. Conclusions: Both light sources result in temperature increases above 5.5°C. Additionally, the remaining dentin thickness of 1mm promoted the largest temperature increase.

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Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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Composite Photopolymerization: Temperature Increase According To Light Source And Dentin Thickness

Palma‐Dibb

Savaris

Chinelatti

et al. 2016

JDOI

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“…A correlação entre o espectro emitido pela fonte de luz e o espectro de absorção do fotoiniciador, o processo de fotoativação é dependente de outros fatores como, por exemplo, a irradiância (mW/cm2) emitida pela fonte de luz e o tempo de exposição. Caso o compósito não receba quantidade suficiente de densidade de energia, o grau de conversão monomérico será baixo, resultando em possível aumento da citotoxicidade, assim como redução da dureza e do módulo de elasticidade (10).…”

Section: Discussionunclassified

Abordagem dos Cirurgiões Dentistas em Relação a Fotopolimerização de Resinas Compostas

Scariot

Calza²,

Casali³

2017

JOI

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ResumoAparelhos e métodos para a polimerização das resinas compostas vêm buscando melhorar as propriedades das restaurações. Este trabalho objetivou avaliar o conhecimento dos cirurgiões dentistas perante o uso de aparelhos fotopolimerizadores. A obtenção dos dados foi feita por meio de um questionário aplicado para 34 cirurgiões dentistas do curso de especialização em Dentística Restauradora da Pós-Graduação da IMED no ano de 2015 e 2016. Os resultados mostraram que dos 34 cirurgiões dentistas entrevistados 35,30% utilizavam fotopolimerizador da marca Gnatus, 23,53% RadiCall, e 20,58% Schuster. Quanto ao ano 35,3% possuiam fotopolimerizador do ano de 2015, 17,64% de 2010, e 11,77% de 2014. Quanto ao tipo de lâmpada utilizada 91,14% utilizavam Led, 5,38% halógena, e 2,94% led e halógena. Em relação as consequências da contração de polimerização 23,52% dos cirurgiões-dentistas relacionaram a sensibilidade pós-operatória, infiltração marginal, cárie recorrente e trinca de esmalte como consequências, já 20,58% consideraram a infiltração marginal a única consequência e 23,52% apenas a sensibilidade pós-operatória. Do total da amostra 29,4% disseram que para diminuir o estresse da contração de polimerização utilizavam outras técnicas de fotopolimerização, 17,64% do tipo ramp, 20,58% do tipo step. Pode-se observar que 70,56% dos entrevistados relataram que em menos da metade dos seus casos ocorreram incidência de sensibilidade após o tratamento restaurador, 20,58% nunca observaram sensibilidade pós operatória, e 8,82% apenas na metade dos casos. Foi possível observar os tipos e marcas dos aparelhos mais utilizados pelos profissionais, e notou-se ainda uma falta de conhecimento dos profissionais sobre quais são as consequências da contração de polimerização. AbstractApparatus and methods for polymerization of composite resins have been seeking to improve the restorations properties. This study aimed to assess the knowledge of dentists before the use of light curing units. Data collection was done through a questionnaire, administered to 34 dentists from course IMED Restorative Dentistry Specialization in the years 2015 and 2016. The results showed that 34 of the dentists interviewed , 35.30% used Gnatus brand, 23.53% RadiCall, and 20.58% Schuster. As for the year 35.3% had photopolymerizer the year 2015, 17.64% year 2010 and 11.77% year 2014. Regarding the type of lamp used, 91.14% used Led, 5,38% halogen and 2 94% Led and halogen. Regarding the consequences of polymerization shrinkage, 23.52% of dentists related postoperative sensitivity, marginal leakage, recurrent decay and enamel crack as consequences, 20.58% considered the microleakage the only consequence and 23, 52% only postoperative sensitivity. Of the total sample 29.4% said to reduce the stress of polymerization shrinkage used other curing techniques, 17.64% ramp type, 20.58% step type. It can be observed that 70.56% of respondents reported that less than half of the cases occurred sensitivity incidences after the restorative treatment, 20.58% never observed ...

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Dental curing light: non-ionizing electromagnetic radiation and its possible genotoxic effects

Sousa

Silva

Ferreira

et al. 2020

RSD

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Objective: In this scientific study, we aimed to evaluate genotoxic effects in rats (Rattus norvegicus), related to different periods of exposures to the LED curing light. Methodology: For the genotoxicity evaluation, the rats received lights from the LED photopolymerizer for 40 sec, 10 min and 7-and-a-half minutes, while the negative and positive control groups were treated with distilled water and cyclophosphamide by intraperitoneal, respectively. A sample of peripheral blood was collected from the animals for the comet assay. The bone marrow was collected from each rat for the micronucleus test. Results: It was observed that in the comet assay and micronucleus test, the animals exposed to LED for 10 min, showed genotoxic damage, and they have not presented toxicity degree in the periods of 40 sec and 7-and-a-half minutes. Conclusion: It is possible to conclude that, there was genotoxic effects on the animals' teeth when exposed to the LED curing light in 10 min. However, in the periods of 40 sec, and 7- and-a-half minutes, have been not observed genotoxic effects. This means these times are safe for professional dentists in clinical care.

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Fenômenos Relacionados a Fotoativação dos Compósitos Restauradores Odontológicos

Cited by 3 publications

References 22 publications

Composite Photopolymerization: Temperature Increase According To Light Source And Dentin Thickness

Composite Photopolymerization: Temperature Increase According To Light Source And Dentin Thickness

Abordagem dos Cirurgiões Dentistas em Relação a Fotopolimerização de Resinas Compostas

Dental curing light: non-ionizing electromagnetic radiation and its possible genotoxic effects

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