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ABSTRACT The SPIRIT 2013 statement aims to improve the completeness of clinical trial protocol reporting by providing evidence-based recommendations for the minimum set of items to be addressed. This guidance has been instrumental in promoting transparent evaluation of new interventions. More recently, there has been a growing recognition that interventions involving artificial intelligence (AI) need to undergo rigorous, prospective evaluation to demonstrate their impact on health outcomes. The SPIRIT-AI (Standard Protocol Items: Recommendations for Interventional Trials–Artificial Intelligence) extension is a new reporting guideline for clinical trial protocols evaluating interventions with an AI component. It was developed in parallel with its companion statement for trial reports: CONSORT-AI (Consolidated Standards of Reporting Trials–Artificial Intelligence). Both guidelines were developed through a staged consensus process involving literature review and expert consultation to generate 26 candidate items, which were consulted upon by an international multi-stakeholder group in a two-stage Delphi survey (103 stakeholders), agreed upon in a consensus meeting (31 stakeholders) and refined through a checklist pilot (34 participants). The SPIRIT-AI extension includes 15 new items that were considered sufficiently important for clinical trial protocols of AI interventions. These new items should be routinely reported in addition to the core SPIRIT 2013 items. SPIRIT-AI recommends that investigators provide clear descriptions of the AI intervention, including instructions and skills required for use, the setting in which the AI intervention will be integrated, considerations for the handling of input and output data, the human–AI interaction and analysis of error cases. SPIRIT-AI will help promote transparency and completeness for clinical trial protocols for AI interventions. Its use will assist editors and peer reviewers, as well as the general readership, to understand, interpret and critically appraise the design and risk of bias for a planned clinical trial.

RESUMO A declaração SPIRIT 2013 tem como objetivo melhorar a integralidade dos relatórios dos protocolos de ensaios clínicos, fornecendo recomendações baseadas em evidências para o conjunto mínimo de itens que devem ser abordados. Essas orientações têm sido fundamentais para promover uma avaliação transparente de novas intervenções. Recentemente, tem-se reconhecido cada vez mais que intervenções que incluem inteligência artificial (IA) precisam ser submetidas a uma avaliação rigorosa e prospectiva para demonstrar seus impactos sobre os resultados de saúde. A extensão SPIRIT-AI (Standard Protocol Items: Recommendations for Interventional Trials - Artificial Intelligence) é uma nova diretriz de relatório para protocolos de ensaios clínicos que avaliam intervenções com um componente de IA. Essa diretriz foi desenvolvida em paralelo à sua declaração complementar para relatórios de ensaios clínicos, CONSORT-AI (Consolidated Standards of Reporting Trials - Artificial Intelligence). Ambas as diretrizes foram desenvolvidas por meio de um processo de consenso em etapas que incluiu revisão da literatura e consultas a especialistas para gerar 26 itens candidatos. Foram feitas consultas sobre esses itens a um grupo internacional composto por 103 interessados diretos, que participaram de uma pesquisa Delphi em duas etapas. Chegou-se a um acordo sobre os itens em uma reunião de consenso que incluiu 31 interessados diretos, e os itens foram refinados por meio de uma lista de verificação piloto que envolveu 34 participantes. A extensão SPIRIT-AI inclui 15 itens novos que foram considerados suficientemente importantes para os protocolos de ensaios clínicos com intervenções que utilizam IA. Esses itens novos devem constar dos relatórios de rotina, juntamente com os itens básicos da SPIRIT 2013. A SPIRIT-AI preconiza que os pesquisadores descrevam claramente a intervenção de IA, incluindo instruções e as habilidades necessárias para seu uso, o contexto no qual a intervenção de IA será integrada, considerações sobre o manuseio dos dados de entrada e saída, a interação humano-IA e a análise de casos de erro. A SPIRIT-AI ajudará a promover a transparência e a integralidade nos protocolos de ensaios clínicos com intervenções que utilizam IA. Seu uso ajudará editores e revisores, bem como leitores em geral, a entender, interpretar e avaliar criticamente o delineamento e o risco de viés de um futuro estudo clínico.

https://doi.org/10.26633/rpsp.2024.12

Directrices para presentación de informes de ensayos clínicos sobre intervenciones con inteligencia artificial: extensión CONSORT-AI
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Liu, Xiaoxuan

; Cruz Rivera, Samantha

; Moher, David

; Calvert, Melanie J.

; Denniston, Alastair K.

; Chan, An-Wen

; Darzi, Ara

; Holmes, Christopher

; Yau, Christopher

; Moher, David

; Ashrafian, Hutan

; Deeks, Jonathan J.

; Ferrante di Ruffano, Lavinia

; Faes, Livia

; Calvert, Melanie J.

; Keane, Pearse A.

; Cruz Rivera, Samantha

; Vollmer, Sebastian J.

; Liu, Xiaoxuan

; Lee, Aaron Y.

; Jonas, Adrian

; Esteva, Andre

; Beam, Andrew L.

; Chan, An-Wen

; Panico, Maria Beatrice

; Lee, Cecilia S.

; Haug, Charlotte

; Kelly, Christophe J.

; Yau, Christopher

; Mulrow, Cynthia

; Espinoza, Cyrus

; Fletcher, John

; Moher, David

; Paltoo, Dina

; Manna, Elaine

; Price, Gary

; Collins, Gary S.

; Harvey, Hugh

; Matcham, James

; Monteiro, Joao

; Khair ElZarrad, M.

; Ferrante di Ruffano, Lavinia

; Oakden-Rayner, Luke

; Calvert, Melanie J.

; McCradden, Melissa

; Keane, Pearse A.

; Savage, Richard

; Golub, Robert

; Sarkar, Rupa

; Rowley, Samuel

Revista Panamericana de Salud Pública

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2024, Volume 48 elocation e13

Abstract: Es En Pt | Text: Es En Pt | PDF: Es | PDF: En | PDF: Pt

resumen está disponible en el texto completo

ABSTRACT The CONSORT 2010 statement provides minimum guidelines for reporting randomized trials. Its widespread use has been instrumental in ensuring transparency in the evaluation of new interventions. More recently, there has been a growing recognition that interventions involving artificial intelligence (AI) need to undergo rigorous, prospective evaluation to demonstrate impact on health outcomes. The CONSORT-AI (Consolidated Standards of Reporting Trials–Artificial Intelligence) extension is a new reporting guideline for clinical trials evaluating interventions with an AI component. It was developed in parallel with its companion statement for clinical trial protocols: SPIRIT-AI (Standard Protocol Items: Recommendations for Interventional Trials–Artificial Intelligence). Both guidelines were developed through a staged consensus process involving literature review and expert consultation to generate 29 candidate items, which were assessed by an international multi-stakeholder group in a two-stage Delphi survey (103 stakeholders), agreed upon in a two-day consensus meeting (31 stakeholders) and refined through a checklist pilot (34 participants). The CONSORT-AI extension includes 14 new items that were considered sufficiently important for AI interventions that they should be routinely reported in addition to the core CONSORT 2010 items. CONSORT-AI recommends that investigators provide clear descriptions of the AI intervention, including instructions and skills required for use, the setting in which the AI intervention is integrated, the handling of inputs and outputs of the AI intervention, the human–AI interaction and provision of an analysis of error cases. CONSORT-AI will help promote transparency and completeness in reporting clinical trials for AI interventions. It will assist editors and peer reviewers, as well as the general readership, to understand, interpret and critically appraise the quality of clinical trial design and risk of bias in the reported outcomes.

RESUMO A declaração CONSORT 2010 apresenta diretrizes mínimas para relatórios de ensaios clínicos randomizados. Seu uso generalizado tem sido fundamental para garantir a transparência na avaliação de novas intervenções. Recentemente, tem-se reconhecido cada vez mais que intervenções que incluem inteligência artificial (IA) precisam ser submetidas a uma avaliação rigorosa e prospectiva para demonstrar seus impactos sobre os resultados de saúde. A extensão CONSORT-AI (Consolidated Standards of Reporting Trials – Artificial Intelligence) é uma nova diretriz para relatórios de ensaios clínicos que avaliam intervenções com um componente de IA. Ela foi desenvolvida em paralelo à sua declaração complementar para protocolos de ensaios clínicos, a SPIRIT-AI (Standard Protocol Items: Recommendations for Interventional Trials – Artificial Intelligence). Ambas as diretrizes foram desenvolvidas por meio de um processo de consenso em etapas que incluiu revisão da literatura e consultas a especialistas para gerar 29 itens candidatos. Foram feitas consultas sobre esses itens a um grupo internacional composto por 103 interessados diretos, que participaram de uma pesquisa Delphi em duas etapas. Chegou-se a um acordo sobre os itens em uma reunião de consenso que incluiu 31 interessados diretos, e os itens foram refinados por meio de uma lista de verificação piloto que envolveu 34 participantes. A extensão CONSORT-AI inclui 14 itens novos que, devido à sua importância para as intervenções de IA, devem ser informados rotineiramente juntamente com os itens básicos da CONSORT 2010. A CONSORT-AI preconiza que os pesquisadores descrevam claramente a intervenção de IA, incluindo instruções e as habilidades necessárias para seu uso, o contexto no qual a intervenção de IA está inserida, considerações sobre o manuseio dos dados de entrada e saída da intervenção de IA, a interação humano-IA e uma análise dos casos de erro. A CONSORT-AI ajudará a promover a transparência e a integralidade nos relatórios de ensaios clínicos com intervenções que utilizam IA. Seu uso ajudará editores e revisores, bem como leitores em geral, a entender, interpretar e avaliar criticamente a qualidade do desenho do ensaio clínico e o risco de viés nos resultados relatados.

https://doi.org/10.26633/rpsp.2024.13

Directrices para los protocolos de ensayos clínicos de intervenciones con inteligencia artificial: la extensión SPIRIT-AI
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Cruz Rivera, Samantha

; Liu, Xiaoxuan

; Chan, An-Wen

; Denniston, Alastair K.

; Calvert, Melanie J.

; Denniston, Alastair K.

; Chan, An-Wen

; Darzi, Ara

; Holmes, Christopher

; Yau, Christopher

; Moher, David

; Ashrafian, Hutan

; Deeks, Jonathan J.

; Ferrante di Ruffano, Lavinia

; Faes, Livia

; Calvert, Melanie J.

; Keane, Pearse A.

; Cruz Rivera, Samantha

; Vollmer, Sebastian J.

; Liu, Xiaoxuan

; Lee, Aaron Y.

; Jonas, Adrian

; Esteva, Andre

; Beam, Andrew L.

; Chan, An-Wen

; Panico, Maria Beatrice

; Lee, Cecilia S.

; Haug, Charlotte

; Kelly, Christophe J.

; Yau, Christopher

; Mulrow, Cynthia

; Espinoza, Cyrus

; Fletcher, John

; Moher, David

; Paltoo, Dina

; Manna, Elaine

; Price, Gary

; Collins, Gary S.

; Harvey, Hugh

; Matcham, James

; Monteiro, Joao

; Khair ElZarrad, M.

; Ferrante di Ruffano, Lavinia

; Oakden-Rayner, Luke

; Calvert, Melanie J.

; McCradden, Melissa

; Keane, Pearse A.

; Savage, Richard

; Golub, Robert

; Sarkar, Rupa

; Rowley, Samuel

Revista Panamericana de Salud Pública

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2023, Volume 47 elocation e149

Abstract: Es En Pt | Text: Es En Pt | PDF: Es | PDF: En | PDF: Pt

resumen está disponible en el texto completo

https://doi.org/10.26633/rpsp.2023.149

Effect of thickness and shade of CAD/CAM composite on the light transmission from different light-curing units
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MAZÃO, Julia Dantas

; RIBEIRO, Maria Tereza Hordones

; BRAGA, Stella Sueli Lourenço

; ZANCOPÉ, Karla

; PRICE, Richard Bengt

; SOARES, Carlos José

Brazilian Oral Research

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2023, Volume 37 elocation e114

Abstract: En | Text: En | PDF: En

Abstract The thickness and shade of a restoration will affect the transmission of light from the light-curing unit (LCU). This study determined the power (mW), spectral radiant power (mW/nm), and beam profile of different LCUs through various thicknesses and shades of a CAD-CAM resin composite (BRAVA Block, FGM). Five thicknesses: 0.5; 0.75; 1.0; 1.5, and 2.0 mm, in three shades: Bleach; A2 and A3.5 of a CAD-CAM resin (n = 5). Two single-peak LCUs: EL, Elipar DeepCure-S (3M Oral Care); and OP, Optilight Max (Gnatus), and one multiple-peak LCU: VL, VALO Grand (Ultradent), were used. The LCUs were positioned touching the surface of the BRAVA Block. The power and emission spectrum were measured using a fiberoptic spectrometer attached to an integrating sphere, and the beam profiles using a laser beam profiler. The effect of the material thickness on the light attenuation coefficients was determined. VL and EL delivered more homogeneous beam profiles than OP. The type of the BRAVA Block had a significant effect on the transmitted power, and wavelengths of transmitted light (p < 0.001). There was an exponential reduction in the power and emission spectrum as the thickness of the BRAVA Block increased (p < 0.001). The light transmission through the A2 shade was least affected by the thickness (p < 0.001). The attenuation coefficient was higher for the violet light and higher for A3.5 than the A2 or Bleach shades. No violet light from the VL could be detected at the bottom of 2.0 mm of the BRAVA Block.

https://doi.org/10.1590/1807-3107bor-2023.vol37.0114

Mysidopsis gemina n. sp. (Crustacea: Mysida: Mysidae) from the northern Pacific coast of Costa Rica
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Price, W. Wayne

; Heard, Richard W.

; Vargas, Rita

Nauplius

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2019, Volume 27 elocation e2019016

Abstract: En | Text: En | PDF: En

Abstract Mysidopsis gemina n. sp. is described from protected and exposed beach habitats in the provinces of Puntarenas and Guanacaste on the northern Pacific coast of Costa Rica. Morphologically, M. gemina most closely resembles M. furca Bowman, 1957 known from the Atlantic and Gulf Coasts of North America. Both these species are unique within the genus by their distinctively sexually dimorphic telsons. The new Costa Rican species can be distinguished from M. furca and other species of Mysidopsis by a combination of having a male with biarticulated endopods on the first pleopods and pleopods 2-5 with large plate-like pseudopodia (exites). The occurrence of these characters and morphological features within the subfamily Leptomysinae is discussed.

https://doi.org/10.1590/2358-2936e2019016 560 downloads

Irradiance and Radiant Exposures Delivered by LED Light-Curing Units Used by a Left and Right-Handed Operator
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Soares, Carlos José

; Bragança, Gabriel Felipe de

; Pereira, Renata Afonso da Silva

; Rodrigues, Monise de Paula

; Braga, Stella Sueli Lourenço

; Oliveira, Laís Rani Sales

; Giannini, Marcelo

; Price, Richard Bengt

Brazilian Dental Journal

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may 2018, Volume 29 N. 3 Pages 282 - 289

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo A combinação da localização da restauração, a preferência de mão do operador ao utilizar aparelhos fotopolimerizadores (AFP) com luz emitida por diodo (LED) e o formato do AFP podem afetar a quantidade de luz fornecida à restauração. O objetivo foi avaliar o efeito de operadores canhotos e destros, a posição do operador (dentista ou auxiliar), e o formato do AFP na irradiância, energia radiante e espectro de luz entregue ao mesmo dente posterior. Dois AFP foram testados: um com formato angulado, onda única Radii-Cal (SDI, Victoria, Australia) e um formato reto multi-pico Valo Cordless (Ultradent, South Jordan, UT, USA). Os valores de irradiância (mW/cm²), energia radiante (J/cm²) e espectro de luz foram medidos utilizando um sensor no segundo molar superior esquerdo. A irradiância e energia radiante foram analisados utilizando ANOVA 3 fatores seguido por teste de Tukey (a=0.05). O espectro de luz (nm) foi analisado de forma descritiva. A interação entre o formato do AFP, posição do operador e preferência de mão foram significativamente influentes na irradiância e energia radiante (P<0.001). Em todos os casos, Valo teve irradiância significativamente maior que Radii-Cal. A mão dominante e a posição do operador afetaram a irradiância e energia radiante com o Valo. Posição do operador e acesso afetou a irradiância e exposição radiante entregue ao segundo molar superior esquerdo. A irradiância e exposição radiante teve melhores resultados quando AFP foi utilizado com a mão direita pelo operador posicionado na cadeira do lado direito e mão esquerda do operador posicionado do lado esquerdo da cadeira. Estes resultados podem levar a uma melhor polimerização da resina composta.

Abstract The combination of the restoration location, the hand preference of the operator using the light-curing unit (LCU), and the design of the LCU all can have an impact on the amount of the light delivered to the restoration. To evaluate the effect of left-handed or right-handed users, the position of the operator (dentist or assistant), and the LCU design on the irradiance, radiant exposure and emission spectrum delivered to the same posterior tooth. Two light emitting diode (LED) LCUs were tested: an angulated monowave LCU Radii-Cal (SDI, Victoria, Australia) and a straight aligned multi-peak LCU Valo Cordless (Ultradent, South Jordan, UT, USA). The irradiance values (mW/cm2), radiant exposure (J/cm2) and emission spectrum were measured using a sensor in maxillary left second molar tooth. The irradiance and radiant exposure were analyzed using three-way ANOVA followed by Tukey test (a=0.05). The emission spectra (nm) were analyzed descriptively. The interaction between LCU design, operator position, and hand preference significantly influenced the irradiance and radiant exposure (P<0.001). In all cases, Valo delivered significantly higher irradiance than Radii-Cal. The handedness and the operator position affected the irradiance and radiant exposure delivered from Valo. Operator position and access affect the irradiance and radiant exposure delivered to the maxillary left second molar. The irradiance and radiant exposure can be greater when a right-hand operator is positioned on the right side of the chair and a left-hand operator is positioned on the left side of the chair. This may result in better resin composite polymerization.

https://doi.org/10.1590/0103-6440201802127 1822 downloads

Multiple-peak and single-peak dental curing lights comparison on the wear resistance of bulk-fill composites
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Sahadi, Beatriz Ometto

; Price, Richard Bengt

; André, Carolina Bosso

; Sebold, Maicon

; Bermejo, Gabriel Nima

; Palma-Dibb, Regina Guenka

; Faraoni, Juliana Jendiroba

; Soares, Carlos José

; Giannini, Marcelo

Brazilian Oral Research

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2018, Volume 32 elocation e122

Abstract: En | Text: En | PDF: En

Abstract: The effects of tooth brushing could affect the long-term esthetic outcome of composite restorations. This study evaluated the effect of two different emission spectrum light-curing units on the surface roughness, roughness profile, topography and microhardness of bulk-fill composites after in vitro toothbrushing. Valo (multiple-peak) and Demi Ultra (single-peak) curing lights were each used for 10s to polymerize three bulk-fill resin composites: Filtek Bulk Fill Posterior Restorative (FBF), Tetric EvoCeram Bulk Fill (TET) and Surefil SDR Flow (SDR). After 30,000 reciprocal strokes in a toothbrushing machine, the roughness profile, surface roughness, surface morphology, and microhardness were examined. Representative SEM images were also obtained. When light-cured with the Demi Ultra, SDR showed the most loss in volume compared to the other composites and higher volume loss compared to when was light-cured with Valo. The highest surface roughness and roughness profile values were found in SDR after toothbrushing, for both light-curing units tested. FBF always had the greatest microhardness values. Light-curing TET with Valo resulted in higher microhardness compared to when using the Demi Ultra. Confocal and SEM images show that toothbrushing resulted in smoother surfaces for FBF and TET. All composites exhibited surface volume loss after toothbrushing. The loss in volume of SDR depended on the light-curing unit used. Toothbrushing can alter the surface roughness and superficial aspect of some bulk-fill composites. The choice of light-curing unit did not affect the roughness profile, but, depending on the composite, it affected the microhardness.

https://doi.org/10.1590/1807-3107bor-2018.vol32.0122 1616 downloads

Heteromysis cocoensis n. sp. (Crustacea: Mysida: Mysidae) from coastal waters of Isla del Coco, Costa Rica
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Price, W. Wayne

; Heard, Richard W.

; Vargas, Rita

Nauplius

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2018, Volume 26 elocation e2018012

Abstract: En | Text: En | PDF: En

ABSTRACT A survey of the invertebrate fauna of coral reef hard bottom communities in the shallow waters of Isla del Coco yielded a new species of mysid belonging to the genus Heteromysis S. I. Smith, 1873. Heteromysis (Olivemysis) cocoensis, n. sp. was collected from coral rubble at depths of 8 to 34 m. It differs from its congeners by having male pleopods 1, 3, and 4 with modified setae. Within the subgenus Olivemysis Băcescu, 1968, the new species is morphologically most similar to Heteromysis. ekamako Wittmann and Chevaldonne, 2017 from the Pacific, Heteromysis. gomezi Băcescu, 1970, H. mayana Brattegard, 1970, and H. rubrocinta, Băcescu, 1968 from the Western Atlantic, and Heteromysis. dardani Wittmann, 2008, Heteromysis. wirtzi Wittmann, 2008, and Heteromysis. sabelliphila Wittmann and Wirtz, 2017 from the Eastern Atlantic. However, H. cocoensis n. sp. is distinguished from these six apparently closely related species by the following combination of characters: flagellate, modified setae on articles 1 and 3 of the antennular peduncle, and setation of thoracic endopod 3, male pleopods 1, 3 and 4, uropodal endopods, and the apical and lateral margins of the telson. A diagnostic table separating these eight species is given.

https://doi.org/10.1590/2358-2936e2018012 726 downloads

Light curing in dentistry and clinical implications: a literature review
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RUEGGEBERG, Frederick Allen

; GIANNINI, Marcelo

; ARRAIS, Cesar Augusto Galvão

; PRICE, Richard Bengt Thomas

Brazilian Oral Research

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aug 2017, Volume 31 Suppl. 1 elocation e61

Abstract: En | Text: En | PDF: En

Abstract Contemporary dentistry literally cannot be performed without use of resin-based restorative materials. With the success of bonding resin materials to tooth structures, an even wider scope of clinical applications has arisen for these lines of products. Understanding of the basic events occurring in any dental polymerization mechanism, regardless of the mode of activating the process, will allow clinicians to both better appreciate the tremendous improvements that have been made over the years, and will also provide valuable information on differences among strategies manufacturers use to optimize product performance, as well as factors under the control of the clinician, whereby they can influence the long-term outcome of their restorative procedures.

https://doi.org/10.1590/1807-3107bor-2017.vol31.0061 81138 downloads

10.

An Evaluation of the Light Output from 22 Contemporary Light Curing Units
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Soares, Carlos José

; Rodrigues, Monise de Paula

; Oliveira, Laís Rani Sales

; Braga, Stella Sueli Lourenço

; Barcelos, Luciana Mendes

; Silva, Gisele Rodrigues da

; Giannini, Marcelo

; Price, Richard Bengt

Brazilian Dental Journal

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jun 2017, Volume 28 N. 3 Pages 362 - 371

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Este estudo mediu a potência (mW), irradiância (mW/cm2) e espectro da luz (mW/cm2/nm) emitida por 22 fontes de luz (Alt Lux II, BioLux Standard, Bluephase G2, Curing Light XL 3000, Demetron LC, DX Turbo LED 1200, EC450, EC500, Emitter C, Emitter D, KON-LUX, LED 3M ESPE, Led Lux II, Optilight Color, Optilight Max, Optilux 501, Poly Wireless, Radii cal, Radii plus, TL-01, VALO Cordless) disponíveis comercialmente. A potência emitida pelas fontes de luz foi medida usando um medidor laboratorial de potencia com grade a laser. A área (cm²) da ponta ativa efetiva das fontes de luz foi medida com paquímetro digital e utilizada para calcular a irradiância emitida. O simulador de paciente-MARC (MARC - PS) com espectrómetro (USB4000, Ocean Optics) foi usado para medir a irradiância e o espectro de luz emitida por cada fonte de luz na região anterior e posterior. Esta medição foi repetida por três vezes em dois sensores localizados na região anterior e posterior da arcada dentária. Os dados de irradiância foram analisados utilizando análise de variância em dois fatores, e os dados de potência foram analisados com análise de variância em fator único seguido pelo teste de Tukey (a=0,05). As fontes de luz Valo, Bluephase G2, Radii Plus emitiram irradiância semelhante tanto na região anterior como posterior com valores superiores ao mínimo de 500 mW/cm2. Seis fontes de luz emitiram irradiância menor que o recomendado (500 mW/cm2) quando usadas na região posterior: Kon-lux, Altlux II, Biolux Standard TL-01, Optilux 501, DX Turbo LED 1200 e duas quando usadas na região anterior: Kon-lux e Altlux II LCUs. As fontes Bluephase G2, Optilight Max emitiram os maiores valores de potência e as fontes de luz Altlux II e Biolux Standard emitiram os menores valores de potência. O espectro de luz das fontes LED de espectro único variou de forma evidente entre as fontes. As fontes LED multi pico de espectro emitiram espectros de luz similar para ambos os sensores. A fotoativação na região posterior tende a reduzir substancialmente a irradiância da maioria das fontes de luzes testadas.

Abstract This study measured the radiant power (mW), irradiance (mW/cm2) and emission spectra (mW/cm2/nm) of 22 new, or almost new, light curing units (LCUs): - Alt Lux II, BioLux Standard, Bluephase G2, Curing Light XL 3000, Demetron LC, DX Turbo LED 1200, EC450, EC500, Emitter C, Emitter D, KON-LUX, LED 3M ESPE, Led Lux II, Optilight Color, Optilight Max, Optilux 501, Poly Wireless, Radii cal, Radii plus, TL-01, VALO Cordless. These LCUs were either monowave or multiple peak light emitting diode (LED) units or quartz-tungsten-halogen LCUs used in anterior and posterior teeth. The radiant power emitted by the LCUs was measured by a laboratory grade laser power meter. The tip area (cm²) of the LCUs was measured and used to calculate the irradiance from the measured radiant power source. The MARC-Patient Simulator (MARC-PS) with a laboratory grade spectrometer (USB4000, Ocean Optics) was used to measure the irradiance and emission spectrum from each LCU three times at the sensor located on the facial of the maxillary central incisors and then separately at the occlusal of a maxillary second molar. The minimum acceptable irradiance level was set as 500 mW/cm2. Irradiance data was analyzed using two-way ANOVA and the radiant power data was analyzed by one-way ANOVA followed by Tukey test (a=0.05). In general, the irradiance was reduced at the molar tooth for most LCUs. Only the Valo, Bluephase G2 and Radii Plus delivered an irradiance similar to the anterior and posterior sensors greater than 500 mW/cm2. KON-LUX, Altlux II, Biolux Standard, TL-01, Optilux 501, DX Turbo LED 1200 LCUs delivered lower irradiance values than the recommended one used in molar region, KON-LUX and Altlux II LCUs used at the maxillary incisors. Bluephase G2 and Optilight Max delivered the highest radiant power and KON-LUX, Altlux II and Biolux Standard delivered the lowest power. The emission spectrum from the various monowave LED LCUs varied greatly. The multi-peak LCUs delivered similar emission spectra to both sensors.

https://doi.org/10.1590/0103-6440201601466 4357 downloads

11.

Evaluation of Eye Protection Filters Used with Broad-Spectrum and Conventional LED Curing Lights
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Soares, Carlos José

; Rodrigues, Monise de Paula

; Vilela, Andomar Bruno Fernandes

; Rizo, Erick René Cerda

; Ferreira, Lorraine Braga

; Giannini, Marcelo

; Price, Richard Bengt

Brazilian Dental Journal

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feb 2017, Volume 28 N. 1 Pages 9 - 15

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo A alta irradiância e diferentes espectros de luz emitidos por aparelhos fotopolimerizadores (Fp) podem causar danos oculares. Este estudo avaliou a capacidade de 15 filtros de proteção ocular em bloquear a luz prejudicial de um Fp convencional (HP-3M ESPE) e outro de largo espectro (Valo, Ultradent). Utilizando sensor anterior do equioamento MARC-Patient Simulator (BlueLight Analytics inc.) a irradiância que passou através dos diferentes filtros protetores foi mensuradas três vezes. Os valores médios da irradiância que passaram pelos filtros foram analisados usando Análise de variância fatorial e pelo teste de Tukey (a= 0.05). O espetro emitido dos Fps através dos filtros também foi obtido. A análise de variância mostrou que a interação entre os filtros protetores e Fps influenciou significantemente a quantidade de luz transmitida (p<0,001). O teste de Tukey mostrou que a quantidade que luz transmitida através dos protetores oculares quando usado o HP-3M ESPE foi significantemente maior quando comparado aos valores para o Valo, independentemente do filtro testado. Quando foi utilizado a fonte de luz HP-3M ESPE, o filtro de proteção ocular permitiu significativamente maior passagem de luz, seguido por XL 3000, ORTUS, Google Professional, e pelo filtro Gnatus. O filtro do Valo foi o mais eficiente ao bloquear a luz prejudicial. Alguns filtros foram menos eficazes ao bloquear menores comprimentos de onde (<420 nm). No entanto, mesmo no pior cenário dos resultados deste estudo, os filtros foram capazes de bloquear ao menos 97% da irradiância emitida pelas fontes de luz testadas.

Abstract The high irradiance and the different emission spectra from contemporary light curing units (LCU) may cause ocular damage. This study evaluated the ability of 15 eye protection filters: 2 glasses, 1 paddle design, and 12 dedicated filters to block out harmful light from a monowave (HP-3M ESPE) and a broad-spectrum (Valo, Ultradent) LED LCU. Using the anterior sensor in the MARC-Patient Simulator (BlueLight Analytics) the irradiance that was delivered through different eye protection filters was measured three times. The LCUs delivered a similar irradiance to the top of the filter. The mean values of the light that passed through the filters as percent of the original irradiance were analyzed using two-way ANOVA followed by Tukey test (a= 0.05). The emission spectra from the LCUs and through the filters were also obtained. Two-way ANOVA showed that the interaction between protective filters and LCUs significantly influenced the amount of light transmitted (p< 0.001). Tukey test showed that the amount of light transmitted through the protective filters when using the HP-3M-ESPE was significantly greater compared to when using the Valo, irrespective of the protective filter tested. When using the HP-3M-ESPE, the Glasses filter allowed significantly more light through, followed by XL 3000, ORTUS, Google Professional, Gnatus filters. The Valo filter was the most effective at blocking out the harmful light. Some protective filters were less effective at blocking the lower wavelengths of light (<420 nm). However, even in the worst scenario, the filters were able to block at least 97% of the irradiance.

https://doi.org/10.1590/0103-6440201701380 31015 downloads

12.

Meditação em torno dos usos da narrativa na antropologia contemporânea
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Price, Richard

Horizontes Antropológicos

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jun 2004, Volume 10 N. 21 Pages 293 - 312

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Este texto, preparado a partir de um convite para palestrar na abertura da sessão plenária da Associação Americana de História, em janeiro de 2001, refere-se à construção da narrativa histórica pelos antropólogos, e em particular na minha própria trajetória acadêmica. Trato rapidamente da crescente dedicação de antropólogos sobre questões de ética e de epistemologia e dos efeitos desses estudos sobre as estratégias narrativas. Este ensaio igualmente traz um breve panorama sobre minha própria experiência com o estudo das formas narrativas na história.

This text, prepared at the invitation of the American Historical Association for its opening plenary session in January 2001, concerns the construction of historical narrative by anthropologists, in particular myself. It quickly traces anthropologists' growing concerns with ethical and epistemological issues and the effects this has had on narrative strategies. And it provides a brief overview of my own experiments with narrative form in history, beginning with First-Time and Alabi's World, and ending with The Convict and the Colonel.

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13.

Selectivity and efficiency of pyrene attachment to alkanes induced by broadband X-rays
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BROWN, GERALD O.

; GUARDALA, NOEL A.

; PRICE, JACK L.

; WEISS, RICHARD G.

Anais da Academia Brasileira de Ciências

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mar 2003, Volume 75 N. 1 Pages 33 - 38

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A exposição de n-heneicosano (C21H44) dopado com pireno, em sua fase ortorrômbica sólida, a Raios X de faixa larga a <1.3> MeV resulta na formação de mono- e di-heneicosilpirenos, enquanto que a mesma dose em ciclo-hexano líquido produz apenas pireno monossubstituído. Em ambos os casos, a eficiência da reação diminui quando a concentração de pireno aumenta de 10-5 a 10-2 M. Qualitativamente, a eficiência global de ligação é maior em n-heneicosano ortorrômbico do que em ciclohexano líquido, mas a seletividade de ligação é maior em ciclo-hexano. As diferenças entre estes resultados e os de irradiação das mesmas amostras com fotons na faixa de eV são discutidas.

Bombardment of pyrene-doped n-heneicosane (C21H44) in its orthorhombic solid phase with <1.3> MeV broadband X-rays results in the formation of both mono- and di-heneicosylpyrenes, whereas the same dose in liquid cyclohexane yields only monosubstituted pyrene. In both cases, the reaction efficiency decreases as pyrene concentration is increased from 10-5 to 10-2 M. Qualitatively, the overall attachment efficiency is higher in orthorhombic n-heneicosane than in liquid cyclohexane, but the selectivity of attachment is greater in cyclohexane. Differences between these results and those from irradiations of the same samples with eV range photons are discussed.

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14.

O Milagre da crioulização: retrospectiva
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Price, Richard

Estudos Afro-Asiáticos

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2003, Volume 25 N. 3 Pages 383 - 419

Abstract: Pt En Fr | Text: Pt En Fr | PDF: Pt | PDF: En | PDF: Fr

Neste ensaio o autor expande, desenvolve e atualiza idéias originalmente elaboradas no clássico O nascimento da cultura afro-americana, de 1973, no qual os autores propõem uma interpretação para o surgimento de formas culturais africano-americanas originais determinada pelo contexto das plantation societies. Ao mesmo tempo procura responder às críticas dirigidas contra o modelo desenvolvido nesse livro. As críticas podem ser associadas à "virada discursiva" prevalecente em muitos estudos contemporâneos, por um lado. Por outro, se ligam a uma interpretação engajada do passado africano-americano informada por teorias afrocêntricas ou críticas da supremacia branca e do eurocentrismo.

In this essay, the author develops ideas originally shown in 1973, in O Nascimento da Cultura Afro-Americana, in which the author proposes an interpretation of the original African-American cultural forms, determined by the plantation societies context. And it also tries to answer some critics directed to the model developed in this book. The critics might be associated to the prevailing "discursive turning-point" in recent studies. On the other hand, the critics can be related to an interpretation engaged in the African-American past, nurtured by the theories that believe in Africa as the center of all ("African-centrists") or by critics of the white supremacy and the theory that believes in Europe as the center of all ("European-centrists")

Dans cet essai, l'auteur répend, développe et actualise des idées élaborées à l'origine dans le livre classique "La naissance de la culture afro-américaine" , de 1973, dans lequel les auteurs proposent une interprétation pour le surgissement de formes culturelles afro-américaines originales qui sont déterminées par le contexte des "plantation societies". En même temps, il cherche à répondre aux critiques dirigées contre le modèle développé dans ce livre. D'un côté, les critiques peuvent être associées au "détournement discousif" qui prévaut dans de nombreuses études contemporaines; d'un autre côté, elles sont liées à une interprétation engagée du passé afro-américain informée par des théories afrocentriques ou par des critiques de la suprematie blanche et celle de l'eurocentrisme.

13049 downloads

15.

Structural and electronic information on two solid iminophosphoranes, obtained from NMR
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Cherryman, Julian C.

; Harris, Robin K.

; Davidson, Matthew G.

; Price, Richard D.

Journal of the Brazilian Chemical Society

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aug 1999, Volume 10 N. 4 Pages 287 - 292

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Neste trabalho foram obtidos os espectros de RMN CPMAS de fósforo-31 e carbono-13 do imino(trifenil)fosforano e do brometo de amino(trifenil)fosfônio. A análise detalhada desses espectros forneceu informações sobre o tensor de blindagem de 31P e o tensor de acoplamento quadrupolar de 14N. O espectro estático de 31P do brometo foi também analisado em termos dos tensores relevantes. Os cálculos ab initio no nível hf/6-31g* reproduzem bem os dados observados, com exceção dos deslocamentos isotrópicos, os quais requerem cálculos com bases maiores e/ou de um nível teórico superior. As orientações dos tensores na estrutura do brometo foram derivadas através dos cálculos.

Phosphorus-31 and carbon-13 CPMAS NMR spectra have been obtained for imino(triphenyl)phosphorane and amino(triphenyl)phosphonium bromide. Detailed analysis yields information about the 31P shielding tensor and the 14N quadrupole coupling tensor. The static 31P spectrum of the bromide was also analysed in terms of the relevant tensors. Ab initio calculations at the hf/6-31g* level reproduce the observed data well, except for the isotropic shifts, which require a larger basis set and/or higher level of theory. The orientations of the tensors in the molecular frame are derived for the bromide from the calculations.

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