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Sample records for canal radicular sob

  1. Evaluation in vitro of effects of Er:YAG and Nd:YAG lasers irradiation on root canal wall, by stereoscopy, scanning electron micrography and thermographic camera; Avaliacao in vitro dos efeitos da irradiacao laser de Er:YAG e Nd:YAG na parede dentinaria do canal radicular, sob observacao do estereoscopio, da micrografia eletronica e da camera termografica

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    Goya, Claudia

    2001-07-01

    This study was carried out to evaluate in vitro the effects of Nd:YAG laser and Er:YAG laser irradiation in the root canal wall by SEM, evaluating the apical leakage and the temperature changes during the laser irradiation. Seventy four extracted human teeth were used, they were instrumented and divided into seven groups of 10 teeth each. The teeth were evaluated through stereoscopy, by SEM, and with the thermographic camera. The Nd:YAG laser irradiation parameters were 100 mJ/p, 15 Hz, and Er:YAG laser were 160 mJ/p and 10 Hz, the irradiation was 4 times at 2 mm/sec speed, with 20 sec interval. The apical leakage was not observed in the teeth irradiated by Nd:YAG laser alone or in association with Er:YAG laser. However in the teeth irradiated only by the Er:YAG laser we observed a little leakage. By SEM observation the Nd:YAG laser irradiation showed melting and recrystallization in the dentin surface closing dentinal tubules, and in the samples irradiated by Er:Y AG laser a clean surface, opened dentinal tubules, and the combination by two lasers, showed melting covering some dentinal tubules The thermographic study found the temperature increase was not more than 6 deg C. This study showed the safety parameters applications of Er:YAG laser in association with Nd:YAG laser in root canal treatment, in order to not cause thermal damages to the periodontal tissues. (author)

  2. A STUDY OF ROOT CANAL MORPHOLOGY OF Cebus apella TEETH ESTUDO ANATÔMICO DO CANAL RADICULAR DE DENTES DE Cebus apella

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    Priscilla Rocha Afonso

    2008-12-01

    Full Text Available Realizou-se um estudo anatômico em dentes do Cebus apella, para análise da anatomia interna do canal radicular dessa espécie, normatizando seu uso como modelo experimental. Utilizaram-se doze animais adultos. Após a remoção do tecido orgânico, os dentes foram removidos, seccionados e fotografados, sendo analisados com um estereomicroscópio. Os resultados mostraram que os dentes apresentaram características semelhantes às dos seres humanos, mas com algumas peculiaridades, tais como: a anatomia do canal radicular variou de oval para circular; nos caninos inferiores, os canais são semelhantes a um rim, o que reflete o contorno externo da raiz; nos molares superiores, os canais mesiobucal e distobucal são ovais, seguindo o contorno geral do dente. Os autores concluem que esta espécie pode ser utilizada como modelo em pesquisas odontológicas, principalmente em estudos do tratamento do sistema de canal radicular.

    PALAVRAS-CHAVES: Anatomia, dentes, Cebus apella. An anatomic study of Cebus apella root teeth was performed to analyze the internal anatomy of permanent dentition, normalizing its use as experimental model endodontic research. Twelve adult animals were used in this study. After the removal of the organic tissue, the all teeth were removed, sectioned, analyzed and photographed with a stereomicroscope. The results showed that the anatomy of root canal of this species are similar to human dental anatomy, considering the shape, pathway and number of canals, but with some peculiarities, such as: the root canal anatomy varied from oval to circular; in the lower canines, the canals are resembled a kidney, reflecting the outside contour of the root; in the upper molars, the mesiobuccal and distobuccal canals are oval, following the general contour of the tooth. The authors conclude that this primate can be applied as models for study of root canal treatment in human beings, in special the upper central and lateral incisors

  3. Trocas gasosas e balanço de carboidratos em plantas de cana-de-açúcar sob condições de estresses radiculares

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    Cristina Rodrigues Gabriel Sales

    2012-01-01

    Full Text Available Embora a resposta da fotossíntese de plantas de cana-de-açúcar a estresses ambientais seja conhecida, o acúmulo de fitomassa e a dinâmica de carboidratos de reserva diante da exposição simultânea ao frio e à seca são pouco conhecidos. Este trabalho objetiva investigar o efeito do déficit hídrico e da baixa temperatura radicular, isolados e simultaneamente, no genótipo de cana-de-açúcar IACSP94-2094, considerado tolerante à seca. Como hipótese, consideramos que este genótipo também é tolerante à baixa temperatura radicular, já que baixas temperaturas e déficit hídrico ocorrem simultaneamente no campo. A imposição da restrição hídrica de forma isolada ou simultaneamente à baixa temperatura radicular causou redução do potencial da água na folha e da assimilação de CO2, o que não foi observado nas plantas submetidas apenas à baixa temperatura do substrato. Os teores foliares de carboidratos não estruturais, de sacarose e de amido aumentaram nas plantas sob frio radicular. Nos tratamentos com déficit hídrico, apenas o teor de amido foliar diminuiu. Os estresses radiculares causaram aumento nos teores de açúcares solúveis totais e diminuição no teor de amido nas raízes. Como o acúmulo de fitomassa das plantas não foi afetado, mesmo com a restrição no crescimento radicular nos tratamentos com baixa temperatura do substrato, conclui-se que o genótipo de cana-de-açúcar IACSP94-2094 contém indícios de tolerância à baixa temperatura radicular. A manutenção do crescimento da planta deve estar associada à degradação das reservas de amido foliares e radiculares.

  4. SISTEMA RADICULAR DO ARROZ DE TERRAS ALTAS SOB DEFICIÊNCIA HÍDRICA UPLAND RICE ROOT SYSTEM UNDER WATER DEFICIT

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    Camilla Alves Pereira Rodrigues

    2011-01-01

    Full Text Available A morfologia do sistema radicular é uma das características importantes na tolerância de plantas à deficiência hídrica. Assim, objetivou-se verificar aspectos morfológicos de importância, quanto à tolerância à deficiência hídrica do sistema radicular de cultivares de arroz de terras altas, cultivadas sob deficiência hídrica, em condições de casa-de-vegetação, para discriminar linhagens para regiões com distribuição irregular de chuvas. Para tanto, foram semeadas 37 cultivares com ampla variabilidade genética, em tubos de PVC (25 cm de diâmetro e 80 cm de altura com solo, submetidas, após a emissão das panículas, a dois regimes hídricos: sem e com deficiência hídrica (reposição de, aproximadamente, 50% da água evapotranspirada. A densidade radicular foi avaliada na colheita dos grãos (de 20 cm em 20 cm, da superfície até 80 cm de profundidade, tendo as cultivares diferido quanto a esta característica. As cultivares Muruim Branco, Cano Roxo, Amarelão/Douradão e Arroz Agulhinha apresentaram alta densidade radicular, tanto sob deficiência como sob adequada disponibilidade hídrica. A densidade radicular de cultivares de arroz de terras altas, avaliada em colunas de solo, se relacionou, positivamente, com a tolerância à deficiência hídrica destas cultivares, em condições de campo. Esta metodologia constitui-se em importante ferramenta de fenotipagem, para tolerância à deficiência hídrica em arroz.

    PALAVRAS-CHAVE: Cultivares de arroz; seleção para tolerância à seca; temperatura das folhas; densidade de raízes.The root system morphology is one of the most important characteristics in the adaptation of plants to water stress. So, the objective of this study was to analyse important morphologic aspects, regarding the drought tolerance of the root system of upland rice cultivars cultivated under water stress conditions in a greenhouse, in order to discriminate lines to areas with uneven

  5. Efeito do tratamento do canal radicular com EDTA na retenção de pinos de fibra de vidro

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    Luis Alfonso Arana Gordillo

    2010-01-01

    A proposição deste estudo foi analisar o efeito do tratamento da dentina radicular com EDTA na retenção de pinos de fibra de vidro utilizando dois tipos diferentes de cimentos resinosos. Foram utilizados 40 dentes humanos pré-molares hígidos. Após a extração os dentes foram armazenados em água até seu uso. Em seguida, os dentes foram tratados endodonticamente com técnica step back para ser obturados por condensação lateral com cones de guta percha e cimento endodôntico AH Plus. Após a obturaç...

  6. Comparación entre radiografias convencionales y digitales en la medición de canales radiculares

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    Arieta, Luciana Correa; Krause, Ramon; Rockenbach,Maria Ivete Bolzan; Veeck, Elaine Bauer

    2010-01-01

    The objective of this study was to compare conventional and digital radiographs to measure root canals. Fifty permanent single-canal teeth were employed. The roots were placed on the film or on the storage phosphor plate on their longest axes. And they were perpendicularly exposed to the x-ray beam in a distance of 30 cm with the exposure time of 0.08 s. The conventional radiographs were obtained using periapical film #2 (InSight, Kodak). They were measured with a millimeter ruler and with...

  7. Radiographic prevalence of root canal ramifications in a sample of root canal treatments in a Brazilian Dental School Prevalência radiográfica de ramificações do canal radicular em uma amostra de tratamentos endodônticos em uma Faculdade de Odontologia Brasileira

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    Iadasa de Quadros

    2007-06-01

    Full Text Available The aim of this study was to radiographically investigate the presence of root canal ramifications found after endodontic treatment, and to determine any relationship between their presence and the type of the auxiliary chemical substance used. The study evaluated 1,470 endodontic treatments performed by final year undergraduate students at the Dental School of Piracicaba, State University of Campinas (UNICAMP, SP, Brazil, during the period from 1998 to 2000. The X-rays taken during treatment were evaluated in order to establish the presence of ramifications of the root canal system. The initial X-ray did not show the presence of any canal ramifications. After filling, X-rays showed only 3 ramification types: 3.06% of lateral canals, 2.99% of apical deltas, and 0.1% of interradicular canals. The maxillary premolars showed the highest number of lateral canals (n = 13, followed by mandibular premolars (n = 10 and maxillary incisors (n = 10. Apical deltas were mostly found in mandibular molars (n = 14, followed by maxillary incisors (n = 9. Only mandibular molars had interradicular canals. The detection of ramifications increased with the use of EDTA. However, no statistically significant relationship was found between the type of auxiliary chemical substance used and the number of root canal ramifications detected after root canal filling. It was concluded that the frequency of root canal ramifications found radiographically was low in treatments performed by undergraduate students.O objetivo deste estudo foi investigar radiograficamente a presença de ramificações do canal radicular encontrada depois do tratamento endodôntico, e determinar qualquer relação entre a presença destas e do tipo de substância química auxiliar usada. O estudo avaliou 1.470 tratamentos endodônticos executados pelos estudantes do último ano da Faculdade de Odontologia de Piracicaba, Universidade Estadual de Campinas (UNICAMP, SP, Brasil, no período de 1998 a

  8. Avaliação da presença do canal cavo inter-radicular em molares pelo método da microscopia eletrônica de varredura

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    Lorenzzo De Angeli CESCONETTO

    Full Text Available Resumo Introdução A cavidade pulpar ainda é um mistério a ser desvendado, pois podem existir inúmeras ramificações que precisam ser esclarecidas para que o clínico possa interpretar e desenvolver o seu papel adequadamente. Uma das variações anatômicas que apresentam grande controvérsia na literatura é o reconhecimento da presença do canal cavo inter-radicular. Este canal tem origem no assoalho da câmara pulpar, percorre a dentina inter-radicular e alcança o ligamento periodontal na região de furca, constituindo uma das vias de comunicação entre o ligamento periodontal e o tecido pulpar, podendo servir como meio de contaminação. Objetivo Estudar a frequência do canal cavo inter-radicular em molares. Material e método Análise de cinco primeiros molares superiores, dez segundos molares superiores, dez primeiros molares inferiores e dez segundos molares inferiores, utilizando-se a microscopia eletrônica de varredura. Resultado Foi observada a presença de forames em 30% dos assoalhos e 50% das furcas dos primeiros molares inferiores, e 40% e 60% no assoalho e na furca dos segundos molares inferiores, respectivamente. O diâmetro desses forames variou de 32 µm até 312 µm. Conclusão A prevalência deste canal é muito variada ao se analisarem as diferentes metodologias.

  9. Análise comparativa in vitro de três técnicas de colocação da associação corticosteróide-antibiótico no canal radicular

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    Vier, Fabiana Vieira; Só, Marcus Vinicius Reis; Orlando LIMONGI

    1999-01-01

    O objetivo do presente estudo foi comparar três técnicas de colocaçäo da associaçäo corticosteróide-antibiótico no interior do canal radicular, quanto à sua capacidade de penetraçäo em direçäo apical. Após a abertura coronária, foram preparadas trinta raízes distovestibulares de molares superiores humanos através do emprego da técnica cervicoapical, seguidas do preparo escalonado progressivo programado e irrigadas constantemente com hipoclorito de sódio a um por cento. As amostras foram divid...

  10. Comparación de la calidad de la obturación radicular obtenida con el sistema fluido de obturación radicular v/s técnica de compactación lateral Comparison of the sealed quality of the root canals filled with a Flow System Technique versus lateral compactation technique

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    S. Hernández Vigueras

    2008-08-01

    Full Text Available El propósito de este estudio es comparar la calidad de la obturación radicular obtenida al obturar con GuttaFlow® (GF y con la Técnica de Compactación Lateral (LC. Metodología: Se utilizaron 44 raíces palatinas de molares superiores extraídos las cuales fueron preparadas y divididas aleatoriamente en 2 grupos para ser obturadas con la técnica del sistema fluido (GF y la Técnica de Compactación Lateral en frío. Las muestras fueron radiografiadas y cortadas transversalmente para su evaluación microscópica por tercios radiculares. Los parámetros de calidad de obturación evaluados fueron la extensión de la obturación, la adaptación a las paredes del conducto radicular y la presencia de poros/fisuras/vacuolas en el interior de la masa obturadora. Resultados: No se encontraron diferencias significativas en la calidad de la obturación de los 2 grupos estudiados, exceptuando la adaptación a las paredes en tercio cervical y medio, y la presencia de poros en tercio cervical, en los cuales el grupo LC presentó mejores resultados. Conclusiones: El nuevo material fluido de obturación no demostró mejorar la calidad de la obturación radicular al ser comparado con la técnica de LC.The aid of this study is compare the sealed quality of root canals filled with two obturations systems, GuttaFlow or Flow System Technique (GF and Lateral Compactation Technique (LC. Methodology: Forty-four palatal roots of molar teeth were prepared and divided randomly in two groups to be obturated with the flow system technique and Lateral Compactation Technique. The samples were radiographed and cut cross-sectionally by roots thirds for its microscopic evaluation. The obturations quality parameters evaluated were extension obturation, adaptation to the walls of the root canal and presence of pores/fissures/vacuolas inside the obturation. Results: No statistical difference amongst the filling techniques except between adaptation to the walls of the root

  11. Sistema radicular de plantas de cobertura sob compactação do solo Root system of cover crops under soil compaction

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    Wainer G. Gonçalves

    2006-04-01

    Full Text Available Com o objetivo de avaliar a capacidade de crescimento de raízes em camadas de solo compactadas, quatro espécies de plantas de cobertura (amaranto, milheto ADR 500, capim pé-de-galinha e kenaf foram cultivadas em anéis de PVC, com níveis de compactação em subsuperfície (densidade do solo: 1,18; 1,34; 1,51 e 1,60 Mg m-3, sendo o experimento conduzido em casa de vegetação, utilizando-se de um Latossolo Vermelho distroférrico. A camada compactada em subsuperfície foi restritiva ao crescimento de raízes das espécies estudadas, ocasionando a concentração de raízes na camada superficial. O milheto ADR 500 e o amaranto foram as espécies que se destacaram na produção de massa seca da parte aérea e conseguiram desenvolver-se nas camadas compactadas e abaixo delas. O milheto ADR500 apresentou maior densidade de comprimento radicular em todas as camadas. O capim pé-de-galinha e o amaranto tiveram comportamento semelhante quanto à densidade de comprimento radicular. O capim pé-de-galinha e o kenaf apresentaram menor massa seca de raízes em relação às demais espécies. O kenaf apresentou menores valores de massa seca da parte aérea, mas não foi afetado pela presença de camadas compactadas.With the objective of evaluate the root growth capacity in the compacted soil layer, four vegetal species of the cover crops (amaranth, pearl millet ADR500, finger millet and kenaf were cultivated in columns of PVC with increasing levels of subsurface compaction (soil bulk densities: 1.18; 1.34; 1.51 and 1.60 Mg m-3. The experiment was carried out in a greenhouse conditions, using a Dusky Red Latosol. The subsurface compacted layer was restrictive to the roots growth of the studied species, causing the root concentrating to the surface. Pearl millet ADR500 and the amaranth were the species that had detached in the production of dry matter weight and developed itself in the compacted layers and below of them. Pearl of millet ADR500 presented the

  12. Densidade do sistema radicular da bananeira 'Pacovan' sob irrigação por aspersão Root system density of 'Pacovan' banana plant under sprinkler irrigation

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    Raimundo Lacerda Filho

    2004-12-01

    Full Text Available O presente trabalho foi realizado no município de Governador Dix-Sept Rosado, microrregião Açu-Apodi, no Estado do Rio Grande do Norte, tendo como objetivo verificar os efeitos do sistema de irrigação por aspersão na densidade do sistema radicular da bananeira 'Pacovan'. O delineamento experimental utilizado foi o de blocos casualizados, em esquema de parcelas subdivididas, com cinco repetições. Os tratamentos foram duas amostragens por planta, realizadas do lado contrário ao da emissão da inflorescência, formando um ângulo de 45º. Em cada amostragem, foram realizadas quatro retiradas do material de solo a distâncias de 20 cm, sendo a primeira a 30 cm e a última a 90 cm do pseudocaule. A análise dos dados demonstrou que ocorreu redução linear no peso fresco e na densidade de comprimento de raízes da bananeira em função da profundidade do solo. Em relação à distância do pseudocaule da bananeira, tanto o peso fresco quanto a densidade de comprimento de raízes não mostraram resultados significativos.The present work was conducted at Governador Dix-Sept Rosado County, microregion Açu-Apodi, in the state of Rio Grande do Norte and its objective was to study the effects of sprinkler irrigation system on the density of the root system of 'Pacovan' banana plants. The experiment followed a completely randomized block design, in a split-plot scheme, with five replications. The treatments were two sampling groups, taken per plant, and in the opposite side of the inflorescence emission, forming between them an angle of 45°. In each sampling group, four samples containing soil material were collected at intervals of 20 cm, so the first was distant 30 cm and the last 90 cm from the pseudostem. Data analysis showed that occurred a linear reduction in root fresh weight and in lenght of roots density, in replications to soil depth. For the distance from the plant pseudostem there were no significant differences between samples, both

  13. Root system distribution of rootstocks under ‘Folha Murcha’ orange plant scion in subtropical climateDistribuição do sistema radicular de porta-enxertos sob laranjeira ‘Folha Murcha’ em clima subtropical

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    Neusa Maria Colauto Stenzel

    2012-06-01

    Full Text Available The aim was to study the distribution of the root system of Rangpur lime (Citrus limonia Osbeck, Rough lemon (Citrus jambluri Lush., Cleopatra mandarin (Citrus reshni Hort ex Tan. and Trifoliata (Poncirus trifoliata (L. Ralf., under ‘Folha Murcha’ orange plant scion in subtropical climate, using the auger method. The samples were taken parallel to the line of planting (row 0.5; 1.0; 1.5 and 2.0 m away from the trunk and perpendicular to the line of planting (inter-row 0.5; 1.0; 1.5; 2.0; 2.5; 3.0 and 3.5 m away from the trunk. These samples were stratified into 0 – 0.1; 0.1 – 0.2; 0.2 – 0.4; 0.4 – 0.6 m deep. Dry mass, effective depth and effective distance of the root system of plants were determined. Randomized blocks design was used with four treatments and four replications, with one plant for each plot. Cleopatra mandarin plants had the highest total mass of roots 2.0; 2.5 and 3.0 m away from the trunck in inter-row, and in superficial layers of the following sampling sites: 0.5 and 1.0 m away from the trunk towards row and 1.5 e 2.0 m away from the trunck towards inter-row. Rough lemon plants showed greater effective depth of the roots in the rows than the other rootstocks.Objetivou-se estudar a distribuição do sistema radicular dos limoeiros ‘Cravo’ (Citrus limonia Osbeck e ‘Rugoso da África’ (Citrus jambluri Lush., tangerineira ‘Cleópatra’ (Citrus reshni Hort ex Tan. e ‘Trifoliata’ (Poncirus trifoliata (L. Ralf., sob a laranjeira ‘Folha Murcha’ em clima subtropical. As amostragens foram realizadas, pelo método do trado, paralelamente à linha de plantio (entre plantas a 0,5; 1,0; 1,5 e 2,0 m de distância do tronco e perpendicularmente à linha de plantio (entrelinhas a 0,5; 1,0; 1,5; 2,0; 2,5; 3,0 e 3,5 m de distância do tronco. Essas amostras foram estratificadas em 0 – 0,1; 0,1 – 0,2; 0,2 – 0,4; 0,4 – 0,6 m de profundidade. Foram determinadas: massa seca, profundidade e dist

  14. Influência do alívio, tipo de cimento e anatomia radicular na remoção de núcleos metálicos com ultrassom sob diferentes condições

    OpenAIRE

    2009-01-01

    O objetivo deste estudo foi avaliar o tempo de remoção de núcleos metálicos utilizando o ultrassom, dentro das variáveis: confecção de alívio, tipo de cimento (fosfato de zinco e ionômero de vidro) e anatomia do conduto radicular (circular e oval). Para isto, foram selecionados 80 dentes humanos higidos unirradiculares (caninos superiores e inferiores, incisivos superiores e pré molares inferiores) com diâmetros radiculares. Os dentes tiveram as coroas removidas e os canais radiculares recebe...

  15. Diffusion of calcitonin through the wall of the root canal Avaliação da difusão da calcitonina através da dentina radicular

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    Selma Cristina Cury Camargo

    2004-03-01

    Full Text Available The aim of this study was to evaluate the in vitro diffusion of synthetic salmon calcitonin (CT, used as an intracanal medication, to the external root surface, with or without the presence of intact root cementum. Fifty-four human central incisors were used in the experiment, and were divided into two groups of 21 (test groups and two groups of 6 teeth (control groups. After root canal preparation, 10 ml of calcitonin was inserted within the root canal chamber. The root was sealed and made externally impermeable. Specimens were then placed in tubes with saline solution buffered with phosphates and stored at 37°C. The diffusion of calcitonin was measured after 1, 4 and 7 days. To count calcitonin present at the external media (PBS, ELISA test (an antigen-antibody reaction was used. Results showed that there was calcitonin diffusion through dentin in all of the test samples. The absence of cementum increased the diffusion of calcitonin (p=0.05. The highest counts of CT were obtained on day 7 for groups with or without cementum - showing a direct relation between time and diffusion of the medication.O presente estudo determinou in vitro a difusão da calcitonina sintética de salmão, como medicação intracanal, até a superfície externa radicular, com e sem a presença de cemento radicular. Foram utilizados cinqüenta e quatro incisivos centrais humanos, divididos em dois grupos com 21 dentes cada e dois grupos com 6 dentes cada (controle negativo. Após o preparo endodôntico, os dentes receberam 10 ml de calcitonina como medicação intracanal. Feitos o selamento e a impermeabilização externa da raiz, os espécimes foram acondicionados em tubos com solução salina tamponada com fosfatos e incubados em estufa a 37°C. Foram colhidas amostras da solução salina nos períodos de 1, 4 e 7 dias. Para a análise das soluções teste, utilizou-se teste ELISA. Os resultados mostram que existe a difusão da medicação testada até a superf

  16. Efeito das limas pré-curvadas e retas no ângulo de curvatura de canais radiculares Effects of pre-curved and straight files on the curvature angle of simulated root canals

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    Suely Maria Santos LAMARÃO

    1998-10-01

    Full Text Available Buscou-se avaliar, após o preparo químico-cirúrgico, a modificação do ângulo de curvatura de canais radiculares simulados, confeccionados em blocos de resina epóxica com curvaturas de 35 graus, instrumentados acorde técnica seriada de Paiva & Antoniazzi, usando-se limas tipo K e Flexofile pré-curvadas e retas e limas Nitiflex. Os resultados mostraram que a menor alteração da curvatura foi provocada pela lima Flexofile pré-curvada, seguida da lima Nitiflex e da lima tipo K pré-curvada. Os canais instrumentados com lima tipo K e Flexofile retas mostraram as maiores deformações angulares. A pré-curvatura influencia na deformação dos canais, uma vez que houve diferenças estatísticas significantes entre os valores obtidos pelas limas Flexofile e tipo K pré-curvada ou não.Chemical-surgical preparation (C.S.P. is responsible for shaping and cleaning the root canal, being these the main requirements for a correct filling procedure. Therefore, this study attempted to evaluate the change of curvature angle of simulated root canals after chemical-surgical preparation. These root canals were made in blocks of epoxy resin with curvatures of 35 degrees, and instrumented according to the serial technique of Paiva and Antoniazzi, using type-K files, Flexofile files (pre-curved and straight and Nitiflex files. The results showed that the smallest alteration in curvature was caused by the pre-curved Flexofile files, followed by Nitiflex files and pre-curved type-K files. The root canals instrumented with straight type-K and Flexofile files showed the largest deformation in curvature. The pre-curvature of the files affects the deformation of the root canals, presenting statistically significant differences between the results obtained with straight and pre-curved Flexofile and type-K files.

  17. Effect of biomechanical preparation and calcium hydroxide pastes on the antisepsis of root canal systems in dogs Ação do preparo biomecânico e de pastas à base de hidróxido de cálcio na anti-sepsia do sistema de canais radiculares de cães

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    Janir Alves Soares

    2005-03-01

    Full Text Available In the endodontic treatment of root canals with necrotic pulps associated with periapical radiolucent areas, one of the main objectives of treatment consists in eliminating the microorganisms spread throughout the ramifications of the root canal system. The scope of this study was to evaluate the antiseptic efficacy of biomechanical preparation and two calcium hydroxide-based pastes, in dogs' teeth with experimentally induced chronic periapical lesions. After initial microbiological sampling, instrumentation of the root canals was undertaken using the conventional technique, using K type files used in conjunction with a solution of 5.25% sodium hypochlorite. After ninety-six hours, further microbiological sampling was undertaken and Calen/CPMC or Calasept pastes were applied for 15 and 30 days. Ninety six hours after the removal of the medication, the third microbiological sampling was undertaken and finally histomicrobiological analysis followed using Brown & Brenn staining. The results were analyzed using the Kruskall-Wallis test, with a level of significance established at 5% (p0.05, characterized by an elevated incidence of cocci, bacilli and filaments, predominantly gram-positive, in root canals, secondary canals and accessories, apical cementoplasts and dentinal tubules, but with a low incidence of microorganisms in areas of cementum resorption and the periapical lesion. The biomechanical preparation and intracanal dressing based on calcium hydroxide were important in the antisepsis of the root canal; however, both procedures did not produce significant changes in the microbiological aspects of the root canal system.No tratamento endodôntico dos canais radiculares com polpa necrótica associados à áreas radiolúcidas periapicais, um dos principais objetivos consiste em eliminar os microrganismos situados em todo o sistema de ramificações. Por conseguinte, o objetivo deste estudo foi avaliar a eficácia anti-séptica do preparo

  18. Eficácia de substâncias químicas auxiliares na instrumentação de canais radiculares Efficiency of chemical auxiliaries in the root canal instrumentation

    Directory of Open Access Journals (Sweden)

    Jacy SIMI JUNIOR

    1999-04-01

    Full Text Available Comparou-se, mediante a pesagem de dentes humanos, o emprego de dois métodos químicos coadjuvantes da instrumentação de canais radiculares, a saber: Endo PTC alternado com hipoclorito de sódio a 1%, seguindo-se irrigação/aspiração com solução detergente/anti-séptico (grupo A e hipoclorito de sódio a 1% usado isoladamente (grupo B. Os resultados permitiram as seguintes conclusões: ocorreram diferenças, para os dois grupos estudados, nas três grandezas analisadas. O grupo A propiciou maior diferença de peso quando comparado com o grupo B. Este exigiu menor tempo de instrumentação em relação ao grupo A. Relativamente à diferença de peso por unidade de tempo, o grupo A exibiu valores mais elevados do que o grupo B. Tais diferenças foram estatisticamente significantes (p By weighing human teeth, two auxiliary chemical methods in the instrumentation of root canals were compared as follows: Endo PTC in alternation with 1% sodium hipochlorite followed by irrigation, aspiration with detergent/antisseptic solution (group A and with 1% sodium hipochlorite alone (group B. Our conclusions indicate that: 1 Differences occured in two of the studied groups in three categories. 2 Group A showed a greater difference of weight when compared to group B (p < 0.01. 3 Group B required a minor time of instrumentation in relation to group A (p < 0.05. 4 Relative to the difference of weight based on time unit, group A presented higher values when compared to group B (p < 0.05.

  19. Análise da alteração da curvatura, antes e após o preparo do canal radicular, pelas técnicas manual e rotatória

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    Elaine Manso Oliveira Franco de Carvalho

    Full Text Available INTRODUÇÃO: A dificuldade existente durante o preparo químico-mecânico é fazer o instrumento ampliar o canal e se adaptar à sua forma sem causar deformações. OBJETIVO: Avaliar a alteração da curvatura de canais radiculares com curvatura igual ou superior a 25°, instrumentados pelas técnicas manual e rotatória. MATERIAL E MÉTODO: Foram utilizados 27 molares permanentes superiores e inferiores, instrumentados com limas tipo K n.º 15 até o ápice, radiografados e divididos em três grupos experimentais: G1 (controle - preparado obedecendo à técnica do alargamento progressivo coroa-ápice, tendo o terço cervical preparado por brocas Gates-Glidden n.º 3, 2 e 1 e o terço médio e apical preparados por limas flexíveis com calibre 20, 25 e 30; G2 (Pro taper - preparado com instrumentos rotatórios (Sistema Pro taperÒ até calibre apical 30 (instrumento F2, e G3 (ProFile - preparado com sistema rotatório ProFileÒ até obtenção do calibre apical equivalente a 30, com conicidade de 6%. As imagens radiográficas iniciais e finais foram digitalizadas, e as angulações foram obtidas com auxílio do software Image Tool, baseado no Método de Schneider. Os dados foram submetidos ao teste de Kruskal-Wallis, com nível de significância de 1%. RESULTADO: Não houve diferença estatística, quando da variação do ângulo de curvatura dos canais preparados pelo método manual e pelos métodos rotatórios. Houve diferença significante do ângulo de curvatura entre o primeiro e o último instrumento de cada sistema rotatório. CONCLUSÃO: A alteração da curvatura promovida por limas manuais e pelo método de rotação contínua (sistema Pro taper e sistema ProFile mostrou-se semelhante.

  20. Morphometrical analysis of cleaning capacity using nickel-titanium rotary instrumentation associated with irrigating solutions in mesio-distal flattened root canals Análise morfológica da capacidade de limpeza promovida pela instrumentação rotatória, associada à soluções irrigantes, com limas de níquel-titânio em canais radiculares com achatamento mesio-distal

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    Melissa Andréia Marchesan

    2003-03-01

    Full Text Available Variations in the internal anatomy of root canals may interfere with the success of root canal because tissue remnants may remain in the isthmus, re-entrances and ramifications of flattened root canals making instrumentation more difficult. Successful root canal treatment depends fundamentally on shaping, cleaning, disinfection and obturation. This study verified the quality of cleaning of ProFile .04 rotary technique associated with different irrigating solutions: 0.5% sodium hypochlorite, calcium hydroxide + Tergentol and 2% chlorhexidine in canals with mesio-distal flattening. Twelve human mandibular central incisors were randomly divided into 3 groups and instrumented up to ProFile 0.4 #35 file after cervical preparation, and processed histologically. After optical microscopic evaluation, statistical analysis showed that the percentage of cleaning of the three irrigating solutions was statistically different. Two-by-two comparisons classified the irrigating solutions in increasing order of cleaning: calcium hydroxide + Tergentol As variações da anatomia interna de cada canal radicular podem interferir no sucesso da terapêutica endodôntica devido ao fato de que em canais radiculares achatados, pode persistir remanescentes teciduais em istmos, reentrâncias e ramificações dificultando a execução das técnicas de instrumentação. O sucesso do tratamento dos canais radiculares depende fundamentalmente do preparo da forma, limpeza, desinfecção e obturação. Poucos trabalhos avaliaram a limpeza dos canais radiculares após a instrumentação rotatória. O presente trabalho verificou a qualidade de limpeza dos canais radiculares, por meio da microscopia óptica, promovida pela técnica de instrumentação rotatória associada ao hipoclorito de sódio 0,5%, HCT20 e clorexidina, em canais achatados no sentido mésio-distal. Doze incisivos centrais inferiores humanos foram divididos aleatoriamente em três grupos para que fossem

  1. In vivo microbiological evaluation of the effect of biomechanical preparation of root canals using different irrigating solutions Avaliação microbiológica in vivo do efeito do preparo biomecânico dos canais radiculares utilizando diferentes soluções irrigadoras

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    Mário Tanomaru Filho

    2006-04-01

    Full Text Available The aim of this study was to evaluate the antimicrobial effect of biomechanical preparation using different irrigating solutions. Seventy-eight root canals from premolars of four dogs were used. After experimental induction of periapical lesions, the root canals were prepared using the following solutions for irrigation: Group 1 2.5% sodium hypochlorite (NaOCl; Group 2 2% chlorhexidine (CHX; Group 3 saline solution and Group 4 control group with no biomechanical preparation. The microbiological evaluation of the root canals was performed by counting the colony forming units (CFUs using different culture mediums. Two absorbent paper cones were used in each root canal in order to collect the microbiological samples before, and thirty days after the biomechanical preparation. The culture plates were incubated in aerobic, anaerobic and microaerophilic environment. Statistical evaluation was carried out using analysis of variance, Tukey and Student tests. The results demonstrated that there was reduction in the number of microorganisms in the NaOCl and CHX groups (pO objetivo deste estudo foi avaliar o efeito antimicrobiano do preparo biomecânico com diferentes soluções irrigadoras. Foram utilizados 78 canais radiculares de pré-molares de 4 cães. Após indução experimental das lesões periapicais, os canais radiculares foram preparados utilizando as seguintes soluções irrigadoras: grupo 1 hipoclorito de sódio a 2,5% (NaOCl; grupo 2 clorexidina a 2% (CHX; grupo 3 soro fisiológico. No grupo 4 (controle não foi realizado preparo biomecânico. A avaliação microbiológica do canal radicular foi realizada pela contagem de unidades formadoras de colônia, em ufc, nos diferentes meios de cultura. Foram utilizados 2 cones de papel absorvente em cada canal radicular para a realização da colheita microbiológica antes e 30 dias após o preparo biomecânico. As placas de cultura foram incubadas em ambiente de aerobiose, anaerobiose e

  2. Avaliação da efetividade de cimentos resinosos auto-adesivos aplicados sob diferentes pré-tratamentos da dentina radicular na resistência adesiva de pinos de fibra de vidro

    OpenAIRE

    Lima, Luiz Rafael Calixto [UNESP

    2013-01-01

    The retention of prefabricated fiberglass posts used in the restoration of endodontically treated teeth is dependent on their bond between the surface of the post and the root canal walls by means of resin cements. The self-adhesive resin cements have recently introduced to simplify the procedure for cementing, but their clinical performance is still controversial in the literature. Thus, the objective of this study is to evaluate the effectiveness of self-adhesive cements under different pre...

  3. Eficiência de uso de fósforo por cultivares de café e adaptação morfológica do sistema radicular sob deficiência do nutriente.

    OpenAIRE

    Ana Paula Neto

    2014-01-01

    O fósforo (P) é um elemento essencial à produção agrícola, finito e insubstituível em suas funções no metabolismo vegetal. A baixa disponibilidade do nutriente nos solos tropicais está relacionada à sua forte interação com os colóides e íons na solução do solo, por meio da adsorção e precipitação, que reduzem a fração disponível. As plantas desenvolvem mecanismos de adaptação sob deficiência de P nos solos. Diversos estudos indicam variação genotípica das plantas em relação ao uso eficiente d...

  4. Influência da estrutura do solo na distribuição e na morfologia do sistema radicular do milho sob três métodos de preparo

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    W. M. P. Mello Ivo

    1999-03-01

    Full Text Available O estudo da distribuição de raízes no solo é um método adequado para se detectarem as condições adversas ou não ao seu desenvolvimento, bem como para avaliar o efeito das alterações introduzidas por sistemas de preparo do solo. Sendo assim, o objetivo deste trabalho foi avaliar o efeito de métodos de preparo sobre determinadas características do solo e, por conseguinte, sobre o desenvolvimento do sistema radicular do milho. Para tal, foi utilizado um experimento de campo, instalado em um solo Podzólico Vermelho-Escuro com cinco anos de utilização por preparo convencional, reduzido e semeadura direta, na sucessão aveia + trevo/milho. Para observar as modificações estruturais do solo, usou-se o método do perfil cultural adaptado, acompanhado por determinações de densidade do solo, porosidade total, macro e microporosidade e resistência ao penetrômetro. Os métodos da parede do perfil e do monolito (prancha com pregos foram utilizados para determinar a distribuição e morfologia das raízes. Nos mapas estruturais descritos, observou-se que os modos de organização provocados pelos tratamentos explicaram parcialmente a presença das raízes no perfil. As plantas submetidas à semeadura direta, quando comparadas às do preparo convencional, tiveram o crescimento inicial das raízes diferindo do padrão diagonal normal e, ao final do ciclo, apresentaram raízes com maior raio médio nas profundidades de 10-15 e 25-35 cm e mostraram a densidade de comprimento (cm cm-3 maior na camada superficial (0-5 cm e menor na camada de 10-15 cm. Os sistemas de preparo não afetaram a massa seca de raízes e o rendimento dos grãos de milho.

  5. [Upper lateral incisor with 2 canals].

    Science.gov (United States)

    Fabra Campos, H

    1991-01-01

    Clinical case summary of the patient with an upper lateral incisor with two root canals. The suspicion that there might be an anatomic anomaly in the root that includes a complex root canal system was made when an advanced radicular groove was detected in the lingual surface or an excessively enlarged cingulum.

  6. Location and angulation of curvatures of mesiobucal canals of mandibular molars debrided by three endodontic techniques Posição e angulação de curvaturas radiculares em canais mesiobucais de molares inferiores preparados por três técnicas endodônticas

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    Isa Geralda Teixeira Constante

    2007-03-01

    Full Text Available The aim of this study was to assess the correlation between the degree of angulation and the position of root curvatures and their influence on the comparative results between the performances of the Progressive, Staged and Serial Preparation Techniques. The mesiobucal canals of 70 extracted mandibular molars were filled with a radiological contrast of 100% Barium sulphate and radiographed with a direct digital radiographic system, in an apparatus that guarantees that the samples remain in the same spatial position at all times. The images were then analyzed in the Coreldraw 10 program (MicroSafe, RJ, Brasil in accordance with two criteria: the methods of Berbert, Nishiyama¹ (1994 and Schneider11 (1971 to determine the position and the angle of the root curvatures, respectively. Initially, the possibility of correlation between these two variables was studied. The teeth were then selected according to angulation (greater than 25 degrees and position of root curvatures (cervical, median and apical in order to perform the endodontic techniques. After preparation, the samples were radiographed again and the images were superimposed in order to compare the pre- and post-operative areas. The difference between them showed the percentage of widening for each technique. The results showed that there was no correlation between the angulations and the root curvature positions, and that the different positions did not interfere in the performance of the techniques. The Progressive Preparation technique produced the highest widening values for all the groups, irrespective of the root curvature position.O objetivo deste trabalho foi verificar a correlação entre o grau de angulação e a posição das curvaturas radiculares, e a sua influência nos resultados comparativos entre os desempenhos das técnicas do Preparo Progressivo, Escalonada e Seriada. Os canais mésio-vestibulares de 70 dentes molares inferiores extraídos foram preenchidos com um

  7. Effect of rotary instrumentation and of the association of calcium hydroxide and chlorhexidine on the antisepsis of the root canal system in dogs Efeito da instrumentação automatizada e da associação hidróxido de cálcio e clorexidina na anti-sepsia de canais radiculares de cães

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    Janir Alves Soares

    2006-04-01

    Full Text Available This study aimed at evaluating the antisepsis of the root canal system (RCS and periapical region (PR provided by rotary instrumentation associated with chlorhexidine + calcium hydroxide as intracanal medicament. Chronic periapical lesions were induced in 26 pre-molar roots in two dogs. After microbiological sampling, automatic instrumentation using the Profile system and irrigation with 5.25% sodium hypochlorite solution, with a final rinse of 14.3% EDTA followed by profuse irrigation with physiological saline were carried out in 18 root canals. After drying the canals, a paste based on calcium hydroxide associated with a 2% chlorhexidine digluconate solution was placed inside them. After 21 days, the medication was removed, leaving the root canals empty and coronally sealed. After 96 hours, a final microbiological sample was obtained, followed by histomicrobiological processing by the Brown & Brenn method. Eight untreated root canals represented the control group (C-G. Based on the Mann-Whitney test at a confidence level of 5% (p Este estudo objetivou avaliar a anti-sepsia do sistema de canais radiculares (SCR e da região periapical (RP proporcionada pela instrumentação automatizada associada a medicação intracanal à base de hidróxido de cálcio + clorexidina. Lesões periapicais crônicas foram induzidas em 26 raízes de pré-molares de dois cães. Após amostragem microbiológica, procedeu-se à instrumentação automatizada de 18 canais radiculares (CR utilizando-se o sistema Profile e a solução de hipoclorito de sódio a 5,25%, com irrigação final com EDTA a 14,3%, seguida de irrigação profusa com soro fisiológico. Após se secarem os canais, foi colocada em seu interior uma pasta à base de hidróxido de cálcio P.A. associada à solução de digluconato de clorexidina a 2%. Transcorridos 21 dias, removeu-se a medicação, deixando-se os CR vazios e selados coronariamente. Após 96 horas, obteve-se a amostra microbiol

  8. In vivo evaluation of the sealing ability of two endodontic sealers in root canals exposed to the oral environment for 45 and 90 days Avaliação, in vivo, da capacidade de selamento de dois cimentos endodônticos em canais radiculares expostos ao meio bucal por 45 e 90 dias

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    Patrícia Maria Poli Kopper

    2006-01-01

    Full Text Available This in vivo study evaluated the sealing ability of a resin-based sealer (AH Plus and a zinc oxide-eugenol sealer (Endofill in dogs' teeth, exposed to the oral environment for 45 and 90 days. Forty eight lower incisors from 8 dogs were endodonticaly treated. A stratified randomization determined the sealer use in each root canal. All canals were filled using the lateral condensation technique. The excess filling material at the cervical portion of the root canal was sectioned, leaving a 10-mm obturation length inside the canal. Teeth were provisionally sealed with glass ionomer cement for 24 h and the canals were exposed to the oral environment for either 45 or 90 days. Therefore, the experimental groups were as follows: A45- AH Plus for 45 days; A90- AH Plus for 90 days; E45- Endofill for 45 days; and E90- Endofill for 90 days (n=12. After the experimental period, the dogs were killed and the lower jaw was removed. The incisors were extracted and the roots were covered with two coats of nail varnish. The teeth were immersed in India ink for 96 h and submitted to diaphanization. Dye leakage (in mm was measured using stereomicroscopy (10x magnification. The results were statistically analyzed using two-way ANOVA and Tukey test for multiple comparisons (á = 0.05. Group E90 (2.03±0.94 showed significantly higher mean leakage value than all other groups (pEste estudo in vivo avaliou a capacidade de selamento de um cimento endodôntico resinoso (AH Plus e um a base de óxido de zinco eugenol (Endofill, em dentes de cães, expostos ao meio bucal, por 45 e 90 dias. Foi realizado o tratamento endodôntico de 48 incisivos inferiores de 8 cães. Uma randomização estratificada determinou o tipo de cimento a ser usado em cada canal que foram tratados pela técnica de condensação lateral. Após a obturação, o excesso de material obturador, na porção cervical do canal radicular foi seccionado, restando o comprimento de 10 mm no interior do canal

  9. Study of the areas and thicknesses of mesiobucal root canals prepared by three endodontic techniques Estudo das áreas e espessuras de canais radiculares mésio-vestibulares preparados por três técnicas endodônticas

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    Isa Geralda Teixeira Constante

    2007-06-01

    Full Text Available The purpose of this study was to compare, in vitro, by means of computerized analysis of digital radiographic images, the anatomic alterations produced in the mandibular molar tooth dentinal walls of mesiobucal canals with severe curvature by three different endodontic techniques: Progressive Preparation, Staged and Serial Preparation. A selection was made of 45 extracted, human, mandibular molars, with root curvatures greater than 25°. They were divided into three groups for every technique studied, which were then sub-divided into three sub-groups in accordance with the position of the curvature along the root: cervical, median or apical. After access surgery and tooth length determination, the canals were filled with 100% Barium Sulphate radiological contrast and the teeth were then radiographed with a direct digital radiography system, using a special apparatus capable of keeping the samples in the same spatial position during the different radiographic takes. After the above-mentioned endodontic techniques had been performed, the teeth were again filled with Barium sulphate and were also radiographed under the same previously mentioned conditions. The pre- and post-operative digital images were then analyzed in two computerized programs, AutoCAD 2004 and CorelDraw 10, to assess, respectively, the areas and the horizontal alterations which occurred in the internal and external walls of the root canals. The results indicated that although no significant differences among the techniques were shown in the statistical analysis, in a descriptive analysis the Progressive Preparation technique was shown to be more regular, uniform and effective.Objetivou-se comparar, in vitro, através de análise computadorizada de imagens radiográficas digitais, as alterações anatômicas promovidas nas paredes dentinárias de canais mésio-vestibulares com curvatura severa de molares inferiores por três técnicas endodônticas diferentes: Preparo Progressivo

  10. Effects of the copper vapour laser radiation in the root canal wall dentine: in vitro experiment using scanning electron microscopy and stereoscopy; Efeitos da radiacao laser de vapor de cobre na parede de dentina de canais radiculares: estudo in vitro por meio de microscopia eletronica de varredura e microscopio estereoscopico

    Energy Technology Data Exchange (ETDEWEB)

    Silveira, Maria Claudia Garcia da

    2001-07-01

    Ten human uniradicular teeth had their crown removed along the cement-enamel junction and right away a proper chemical-surgical preparation of the radicular canals was done; the roots were longitudinally sectioned in order to allow the irradiation of the surfaces of the root canals wall dentine. The hemi-roots were separated in two groups: group I (control), with four hemi-roots, not irradiated; and group II, with 16 hemi-roots, subdivided in four sub-groups submitted to the following exposition time: 0,02 s; 0,05 s; 0,1 s and 0,5 s. A copper vapour laser was used with a 510,6 nm wavelength, total average power of 11 W in green and yellow emissions; average power of 6,5 W in green emission; pulse repetition rate of 16.000 Hz and pulse duration of 30 ns. The pulse energy (green line) is 0,4 mJ and the peak power 13,5 W. The laser cavity is unstable type (R{sub 1}=3.900 mm and R{sub 2}-250 mm). The focusing have focal length lens f{sub 1}=250 mm and f{sub 2}=150 mm. The beam quality is of the M{sup 2}=5. The results obtained by scanning electron microscopy analysis showed the appearance of a cavity in the region of the laser beam incidence in the edges of this cavity, dentin was melt and resolidified presenting also cracks due to heat diffusion. Based on these results, we concluded that the size of the cavity formed in the dentin is directly proportional to the rate of exposure and, the more laser emission in the same area, more damage in the root canals wall dentin occurs. More studies need to be done with different exposition's time in order to obtain a safety protocol that does not cause injury in dental and support tissue. (author)

  11. Assessment of the bacteria reduction in the infected root canal irradiated with diode laser; Avaliacao da reducao bacteriana em conduto radicular infectado e irradiado com laser de diodo. Estudo in vitro

    Energy Technology Data Exchange (ETDEWEB)

    Radaelli, Claudia Amaral Rabello de Mello

    2002-07-01

    High success rates are achieved in conventional endodontic treatment of vital pulp teeth. However, in cases of non-vital pulp, a decrease in the rate of success occurs due to difficulties in achieving a complete disinfection of the root canals system. Some bacteria, such as Enterococcus faecalis, are frequently found in cases of endodontic treatment failure due to their high resistance to the conventional endodontic treatment. The aim of this study was to evaluate the efficiency of a high power diode laser irradiation in bacterial reduction of contaminated canals associated with dressing compose by calcium hydroxide paste propylene glycol and camphorated paramonochlorophenol. Eighty-two root canals were infected in vitro with Enterococcus faecalis in a concentration of 1x10{sup 8} CFU/ml. Specimens were high intensity irradiated with a diode laser model Opus 10, at a wavelength of 830 nm. Two different parameters were employed in continuous mode: 3 W and 2,5 W with a 360 {mu}m optical fiber at an angle of approximately 5 degrees respect to the dentine surface during 5 seconds, in 4 applications, with 20 seconds intervals among them. After these proceedings specimens were vortexed in peptone water and dilutions performed. Aliquots of the dilution were plated on m-Enterococcus agar, incubated, and the Colonies Forming Units (CFU) of ali groups was counted. The results showed a significant reduction of bacteria on ali groups after laser irradiation. A high reduction rate was achieved: 98.5% immediately after the laser irradiation; 48 hours after, the reduction was of 96,73% and, finally, a 100% reduction was achieved through the combination of laser irradiation and a long lasting dressing of calcium hydroxide paste, propylene glycol and camphorated paramonochlorophenol. High rates of bacteria reduction were achieved using the parameter of 3 W in continuous mode with the power of 2,9473 KW/cm{sup 2}. The temperature was monitored with a K-pipe thermocouple placed at

  12. Reparacion espontánea de fractura radicular horizontal

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    Jorge Elias Dancur Turizo

    2013-10-01

    Full Text Available Resumen Se reporta un caso clínico de una fractura radicular horizontal en un central superior izquierdo, que reparó espontáneamente sin tratamiento dental alguno. La fractura se diagnosticó catorce años después de recibir el trauma, en un examen radiográfico rutinario de la consulta endodóntica, ya que el diente sin ninguna sintomatología presentaba al examen clínico cambio de color y al examen radiográfico se observaba zona radiolúcida en la zona apical, por lo que fue remitida del posgrado de ortodoncia al posgrado de endodoncia de la facultad de odontología de la Universidad de Cartagena. Al examen radiográfico realizado en el posgrado de endodoncia se observa línea de fractura radicular horizontal a nivel de la unión del tercio cervical con el tercio medio de la raíz y además se encuentra un defecto óseo al mismo nivel de la fractura radicular. Se realiza el tratamiento de conducto radicular sin complicación alguna. Este caso es sorprendente por realizarse una reparación espontánea sin tratamiento odontológico alguno y más aún sin emitirse un diagnóstico de fractura radicular con anterioridad. (DUAZARY 2010, 79 - 83AbstractIs reported a clinical case of a horizontal root fracture in a maxillary left central incisor that was spontaneously repaired without any dental treatment is reported. The root fracture was diagnosed in an x-ray endodontic examination routine fourteen years after receiving the trauma due to changes in the color of the tooth and asymptomatic, x-ray examination showed a radiolucent zone apically, reason why the patient was sent from orthodontic service to endodontic service at Dentistry School of Cartagena University. Radiographs examination showed a line of horizontal fracture between the union of the cervical third with the middle third and in addition there is a bone defect at the same level of the root fracture. Root canal treatment is done without any complication. This case is surprising

  13. Influência do tratamento da dentina radicular na resistência adesiva de pinos de fibra de vidro

    OpenAIRE

    Feuser, Lizette

    2006-01-01

    Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em Odontologia. O objetivo deste estudo in vitro foi avaliar a influência de tratamento da dentina radicular, após preparo mecânico para cimentação, na resistência adesiva de pinos de fibra de vidro, sob teste de cisalhamento por extrusão. Cem caninos humanos tratados endodonticamente, e vinte sem tratamento formaram grupos de acordo com o tratamento da dentina radicular, com ...

  14. Diagnostics and Treatment of Palatal Radicular Grooves

    Institute of Scientific and Technical Information of China (English)

    James Deschner; Birgit Rath; Wang Zheng; Ding Yi

    2006-01-01

    The palatal radicular groove represents a developmental anomaly that mainly affects the maxillary incisor teeth. This anomaly is probably caused by an infolding of the enamel organ and Hertwig's epithelial root sheath during odontogenesis. The groove often originates in the central fossa or cingulum and continues towards the root apex for various distances. The anatomical defect can act as a funnel for plaque and, therefore, result in extensive bone and attachment loss. A complete lack of closure of the calcified tissues along the groove, that is a direct communication between pulp and periodontium, rarely occurs. However, accessory canals between the pulp cavity and periodontal tissues frequently exist along the groove and are main entrances of infectious material into the pulp cavity, facilitating the development of endodontic lesions. Grooves can also complicate restorative therapy or interfere with the accessibility for scaling and root planing. Patients usually present with pain and gingival inflammation in the maxillary incisor region. Bleeding on probing and increased pocket depths are strictly confined to the area of the groove in an otherwise periodontally healthy patient. Radiographs may show a parapulpal line that represents the radiographic image of the groove. Treatment of the anomaly by scaling and root planing alone or in combination with procedures such as odontoplasty, flap surgery, application of an enamel matrix derivative or guided tissue regeneration can be successful. A short case report of a patient treated successfully with an enamel matrix derivative for localized attachment loss due to this anomaly is presented.

  15. Epiduroscopy for Patients With Lumbosacral Radicular Pain

    NARCIS (Netherlands)

    Kallewaard, Jan Willem; Vanelderen, Pascal; Richardson, Jonathan; Van Zundert, Jan; Heavner, James; Groen, Gerbrand Jan

    2014-01-01

    Lumbosacral radicular pain is a pain in the distribution area of one of the nerves of the lumbosacral plexus, with or without sensory and/or motor impairment. A major source of lumbosacral radicular pain is failed back surgery, which is defined as persistent or recurrent pain, mainly in the region o

  16. Influência da penetração de instrumentos, empregados na condensação lateral ativa, na qualidade da obturação de canais radiculares Influence of the penetration of instruments, used in the active lateral condensation, in the quality of root canal filling

    Directory of Open Access Journals (Sweden)

    Bethânia Camargo Pinheiro

    2003-09-01

    Full Text Available OBJETIVO: comparar a qualidade da obturação e a diferença de profundidade de penetração, no interior do canal radicular, dos espaçadores digitais (Finger Spreader, limas tipo Kerr, Flexofile e Nitiflex, quando utilizados como espaçadores, durante a obturação pela Técnica da Condensação Lateral Ativa. MATERIAL E MÉTODOS: foram utilizados 40 dentes molares permanentes humanos, extraídos, instrumentados pela Técnica de Goerig Modificada e divididos em quatro grupos. No grupo I foi utilizado o espaçador digital C; no grupo II, lima tipo Kerr; no grupo III, lima Flexofile e, no grupo IV, lima Nitiflex, todos com diâmetro (D1 ou diâmetro da ponta correspondente ao diâmetro de uma lima 30 (0,30mm, para abertura de espaço para colocação dos cones secundários, durante a Técnica da Condensação Lateral Ativa. Avaliou-se e submeteu-se à análise estatística (Kruskal-Wallis e teste de Dunn a qualidade radiográfica da obturação e a profundidade de penetração dos instrumentos. RESULTADOS E CONCLUSÃO: quanto à análise radiográfica da qualidade da obturação, o grupo II foi o que apresentou o melhor resultado, seguido dos grupos I, IV e III, respectivamente. Em relação à profundidade de penetração dos instrumentos, o grupo IV aproximou-se mais da distância desejada, ou seja, 1 milímetro aquém do comprimento de trabalho, seguido, respectivamente, dos grupos II, III e I.PURPOSE: the purpose of this study was to compare the quality of the obturation and the difference of penetration depth inside the root canal of the instruments Finger Spreader, file type Kerr, Flexofile and Nitiflex when used as spreaders during the filling by Active Lateral Condensation Technique. MATERIAL AND METHOD: 40 extracted permanent human teeth were instrumented by the Modified Goerig Technique and divided in four groups. In the group I the finger spreader was used; in the group II, files type Kerr was used; in the group III, files Flexofile

  17. Postoperative radicular neuroma. Case report.

    Science.gov (United States)

    Erman, T; Tuna, M; Göçer, A I; Idan, F; Akgül, E; Zorludemir, S

    2001-11-15

    Lumbar discectomy is the most common surgical procedure performed in neurosurgery clinics. Such a large number of procedures underscore not only the prevalence of conditions such as intervertebral disc herniation, but also the strong belief of surgeons that the operation does provide benefits to patients suffering from sciatica. In spite of this belief, sciatic pain may continue after the surgery. The recurrence of sciatic and/or back pain after primary discectomy is called the "failed back surgery syndrome." The rate of the complications involved in standard lumbar discectomy ranges from 5.4 to 14%. One of the complications of the lumbar disc surgery is nerve root injury. The complication rate of this injury ranges from 0.7 to 2.2%. Postoperative radicular neuroma must be considered in differential diagnosis for the patient who has failed back surgery syndrome. In this study the authors evaluate a patient who had undergone surgery for lumbar disc herniation and suffered intractable pain. A traumatic radicular neuroma is demonstrated and the pertinent literature is presented.

  18. "In vitro" evaluation of the apical sealing of root canals obturated with different techniques Avaliação "in vitro" do selamento apical dos canais radiculares em função de diferentes técnicas de obturação

    Directory of Open Access Journals (Sweden)

    Viviane Haiub Brosco

    2003-09-01

    Full Text Available The purpose of this study was to compare the apical sealing of root canals obturated with different techniques. One hundred-six human mandibular incisors were submitted to instrumentation by means of the step-back technique. After instrumentation, one hundred teeth received an impermeable coating on the external surfaces of the crown and root (except for the area nearby the apical foramen. Afterwards, they were divided in five groups containing twenty elements each, according to the obturation technique employed: 1. lateral condensation with Kerr file; 2. continuous wave of condensation technique with System B; 3. thermoplasticized injectable gutta-percha technique with the Ultrafil system; 4. mechanically thermoplasticized gutta-percha with the JS Quick-Fill system and 5. thermoplasticized gutta-percha associated to a master cone with the Microseal system. The six remaining teeth were employed as negative and positive controls. After obturation, the access cavities were sealed and the teeth were immersed in aqueous 2% methylene blue dye for 72 hours at 37ºC. After that, the teeth were longitudinally sectioned and the apical microleakage was evaluated in a stereomicroscope. The Microseal system presented the best apical sealing ability, followed by System B, JS Quick-Fill, Ultrafil and the lateral condensation technique. The statistical analysis of the results demonstrated that: 1. the Microseal system presented an apical sealing similar to System B and better than the other groups; 2. System B presented better apical sealing than the lateral condensation technique, being similar to the other groups; and 3. the lateral condensation, Ultrafil and JS Quick-Fill groups demonstrated similar sealing ability.Este estudo teve como objetivo avaliar o selamento apical de canais radiculares obturados por diferentes técnicas. Cento e seis incisivos inferiores humanos tiveram seus canais instrumentados através da técnica escalonada regressiva. Após a

  19. Histomicrobiologic aspects of the root canal system and periapical lesions in dogs' teeth after rotary instrumentation and intracanal dressing with Ca(OH2 pastes Aspectos histomicrobiológicos do sistema de canais radiculares e das lesões periapicais em dentes de cães após instrumentação automatizada e medicação intracanal com pastas de Ca(OH2

    Directory of Open Access Journals (Sweden)

    Janir Alves Soares

    2006-10-01

    Full Text Available OBJECTIVE: The purpose of this study was to evaluate the distribution of microorganisms in the root canal system (RCS and periapical lesions of dogs' teeth after rotary instrumentation and placement of different calcium hydroxide [Ca(OH2]-based intracanal dressings. MATERIALS AND METHODS: Chronic periapical lesions were experimentally induced in 80 premolar roots of four dogs. Instrumentation was undertaken using the ProFile rotary system and irrigation with 5.25% sodium hypochlorite. The following Ca(OH2-based pastes were applied for 21 days: group 1 - Calen (n=18; group 2 - Calen+CPMC (n=20; group 3 - Ca(OH2 p.a. + anaesthetic solution (n=16 and group 4 - Ca(OH2 p.a.+ 2% chlorhexidine digluconate (n=18. Eight root canals without endodontic treatment constituted the control group. Histological sections were obtained and stained with Brown & Brenn staining technique to evaluate the presence of microorganisms in the main root canal, ramifications of the apical delta and secondary canals, apical cementoplasts, dentinal tubules, areas of cemental resorption and periapical lesions. The results were analyzed statistically by the Mann-Whitney U test (p0.05. The percentage of RCS sites containing microorganisms in groups 1, 2, 3, 4 and control were: 67.6%, 62.5%, 78.2%, 62.0% and 87.6%, respectively. CONCLUSION: In conclusion, the histomicrobiological analysis showed that the rotary instrumentation and the different calcium hydroxide pastes employed did not effectively eliminate the infection from the RCS and periapical lesions. However, several bacteria seen in the histological sections were probably dead or were inactivated by the biomechanical preparation and calcium hydroxide-based intracanal dressing.OBJETIVO: Neste estudo avaliou-se a distribuição dos microrganismos no sistema de canais radiculares (SCR e região periapical (RP de cães após instrumentação automatizada e utilização de pastas à base de hidróxido de cálcio CaO(H2

  20. Root system and root and stem base organic reserves of pasture Tanzania grass fertilizer with nitrogen under grazingSistema radicular e reservas orgânicas de raízes e base do colmo do capim Tanzânia fertilizado com doses de nitrogênio sob pastejo

    Directory of Open Access Journals (Sweden)

    Cecilio Viega Soares Filho

    2013-10-01

    Full Text Available The goal of this study was to evaluate the concentrations of non-structural carbohydrate (NSC and of total nitrogen (N, as well as, to evaluate the root system in Tanzania-grass pastures fertilized with doses of urea in fall, spring and summer. The experiment was conducted at the Experimental Farm of Iguatemi, Maringá, Paraná, Brazil, from March 2007 to March 2008. The experimental design was complete random blocks with subplots and four repetitions. The plots showed doses of N (50, 100 e 150 kg ha-1 of N plus the control (no N fertilization, and the subplots the season of the year. Root samples were taken at depths of 0-10, 10-20 and 20-40 cm. Root biomass showed a trend for mass accumulation up to a dosage of 100 kg ha-1 for all seasons evaluated. Also, about 80% of the root system of Tanzaniagrass plants was found on the 0-10 cm layer for all dosages of N. Nitrogen fertilizer above 100 kg ha-1 may foster fast forage plant growth reducing its NSC root storage capacity although favoring NSC and total N storage at stem base. NSC and total N concentrations were highest in fall, demonstrating that its usage is greater in spring due to the weather conditions being favorable to plant growth. In the regrowth, the largest reserve of total N was at the 0-10 cm root layer and the largest NSC reserve is at stem base. O estudo objetivou avaliar as concentrações de carboidratos não estruturais (CNE, nitrogênio (N total e avaliação do sistema radicular em pastagem de capim-Tanzânia adubada com uréia em diferentes doses nas estações de outono, primavera e verão. O experimento foi conduzido na Fazenda Experimental de Iguatemi, Maringá, PR, no período de março de 2007 a março de 2008. O delineamento experimental utilizado foi de blocos completos ao acaso, com parcelas subdivididas com quatro repetições. Foram usadas como parcelas, as doses de N-uréia (50, 100 e 150 kg ha-1 de N-uréia e, como subparcelas, as estações do ano. As

  1. The effect of endodontic regeneration medicaments on mechanical properties of radicular dentin

    Science.gov (United States)

    Yassen, Ghaeth H.

    Endodontic regeneration treatment of necrotic immature teeth has gained popularity in recent years. The approach suggests a biological alternative to induce a continuous root development. In this project, three in vitro experiments were conducted to investigate the effect of three medicaments used in endodontic regeneration on mechanical properties and chemical structure of radicular dentin. In the first experiment, we investigated longitudinally the effect of medicaments on the indentation properties of the root canal surface of immature teeth using a novel BioDent reference point indenter. A significant difference in the majority of indentation parameters between all groups was found after one-week and one-month application of medicaments (p double antibiotic paste (DAP) > control > calcium hydroxide [Ca(OH)2]. The four-week exposure of dentin to TAP and DAP caused 43% and 31% increase in total indentation distance outcome, respectively. In the second experiment, we investigated longitudinally the effect of medicaments on the chemical structure of immature radicular dentin by measuring the phosphate/amide I ratios of dentin using Attenuated Total Reflection Fourier Transform Infrared Spectroscopy. Phosphate/amide I ratios were significantly different between the four groups after one week, two weeks and four week application of medicaments (p untreated dentin > DAP-treated dentin > TAP-treated dentin. In the third experiment, we investigated longitudinally the effect of medicaments on root fracture resistance and microhardness of radicular dentin. For the microhardness, the two-way interaction between group and time was significant (pintegrity of the superficial radicular dentin and significantly affected the indentation properties of the root canal surface. Furthermore, the three month intracanal application of medicaments significantly reduced the fracture resistance of roots.

  2. Spinal canal stenosis; Spinalkanalstenose

    Energy Technology Data Exchange (ETDEWEB)

    Papanagiotou, P.; Boutchakova, M. [Klinikum Bremen-Mitte/Bremen-Ost, Klinik fuer Diagnostische und Interventionelle Neuroradiologie, Bremen (Germany)

    2014-11-15

    Spinal stenosis is a narrowing of the spinal canal by a combination of bone and soft tissues, which can lead to mechanical compression of spinal nerve roots or the dural sac. The lumbal spinal compression of these nerve roots can be symptomatic, resulting in weakness, reflex alterations, gait disturbances, bowel or bladder dysfunction, motor and sensory changes, radicular pain or atypical leg pain and neurogenic claudication. The anatomical presence of spinal canal stenosis is confirmed radiologically with computerized tomography, myelography or magnetic resonance imaging and play a decisive role in optimal patient-oriented therapy decision-making. (orig.) [German] Die Spinalkanalstenose ist eine umschriebene, knoechern-ligamentaer bedingte Einengung des Spinalkanals, die zur Kompression der Nervenwurzeln oder des Duralsacks fuehren kann. Die lumbale Spinalkanalstenose manifestiert sich klinisch als Komplex aus Rueckenschmerzen sowie sensiblen und motorischen neurologischen Ausfaellen, die in der Regel belastungsabhaengig sind (Claudicatio spinalis). Die bildgebende Diagnostik mittels Magnetresonanztomographie, Computertomographie und Myelographie spielt eine entscheidende Rolle bei der optimalen patientenbezogenen Therapieentscheidung. (orig.)

  3. Management of large radicular cyst associated with amalgam particles in cystic lining.

    Science.gov (United States)

    Borkar, Swati A; Dhupar, Vikas; Gadkar, Abhilasha M; Nivedita, C K V S

    2016-01-01

    The failure of amalgam retrofilling and presence of an associated cystic lesion makes surgical endodontic intervention inevitable. Amalgam retrofilling can also give rise to mucoperiosteal tattoo formation and allow incorporation of amalgam particles in the cystic lining. Such a finding has not yet been reported in the endodontic literature. This case report describes the successful endodontic management of a large radicular cyst associated with failed amalgam retrofilling, mucoperiosteal tattoo and amalgam particles dispersed in the epithelial cystic lining. All four mandibular incisors associated with the lesion presented with Weine Type II canal anatomy. The follow-up revealed clinical and radiographic signs of healing.

  4. Management of large radicular cyst associated with amalgam particles in cystic lining

    Science.gov (United States)

    Borkar, Swati A.; Dhupar, Vikas; Gadkar, Abhilasha M.; Nivedita, C.K.V.S.

    2016-01-01

    The failure of amalgam retrofilling and presence of an associated cystic lesion makes surgical endodontic intervention inevitable. Amalgam retrofilling can also give rise to mucoperiosteal tattoo formation and allow incorporation of amalgam particles in the cystic lining. Such a finding has not yet been reported in the endodontic literature. This case report describes the successful endodontic management of a large radicular cyst associated with failed amalgam retrofilling, mucoperiosteal tattoo and amalgam particles dispersed in the epithelial cystic lining. All four mandibular incisors associated with the lesion presented with Weine Type II canal anatomy. The follow-up revealed clinical and radiographic signs of healing. PMID:27217645

  5. Morfologia radicular da dentição permanente de Sapajus apella: morfometria, anatomia macroscópica, ultraestrutura e propriedades físicas

    Directory of Open Access Journals (Sweden)

    Luanna Melo Pereira Fernandes

    2014-08-01

    Full Text Available O objetivo desse trabalho foi contribuir com o estudo anatômico, morfométrico, ultraestrutural e propriedades físicas dos dentes permanentes do primata Sapajus apella. Para tal, foram utilizados 10 animais adultos e machos. Os dentes foram avaliados quanto ao seu comprimento e quanto à anatomia radicular externa e interna considerando número de raízes e canais, forma e direção radicular e forma do canal, assim como análise da densidade e diâmetro tubular do canal radicular, composição e microdureza dentinária. A anatomia radicular desse primata apresentou especificidades, como o número de raízes do segundo pré-molar superior e a presença do terceiro pré-molar. Quanto à densidade e o diâmetro dos túbulos dentinários, observou-se uma diminuição do número e diâmetro de túbulos ao longo do canal radicular, havendo diferença estatisticamente significante ao se comparar o terço apical com as regiões cervical e média, padrão de densidade e tamanho semelhantes a dentes humanos. Semelhanças também foram encontradas com dentes humanos quando comparados os valores de microdureza e proporção de elementos químicos encontrados na dentina radicular.

  6. Ocorrência de desvio radicular em dentes de cão

    Directory of Open Access Journals (Sweden)

    Gioso Marco Antonio

    2000-01-01

    Full Text Available O presente trabalho analisa a ocorrência de desvio radicular em 115 incisivos centrais e intermédios, 34 caninos e 19 quarto pré-molares superiores, totalizando 168 dentes. O desvio foi avaliado por imagens de vídeo VHS sobrepostas a um quadriculado. Os resultados mostram que 77,4% dos incisivos apresentam desvios, sendo 61,0% moderados, 28,5% pequenos e 10,5% severos (estes, apenas nas extremidades do terço apical, de acordo com adaptação da técnica proposta por SCHNEIDER6 para determinação e classificação do grau de curvatura dos canais. Para os caninos anotam-se 47,1% dos dentes com desvio, sendo 75,0% moderados e 25,0% pequenos. E para os quarto pré-molares superiores observam-se 89,4% dos dentes com desvio, sendo 75,0% moderados, 16,7% pequenos e 8,3% severos. Comparados aos desvios radiculares observados na Odontologia Humana, concluímos que a ocorrência dos mesmos é baixa para a espécie canina facilitando a instrumentação do canal radicular.

  7. Sistemas ultrasónicos para la irrigación del sistema de conductos radiculares

    Directory of Open Access Journals (Sweden)

    A. García Delgado

    2014-04-01

    Full Text Available La eliminación de los restos de tejido pulpar vital y necrótico y de los microorganismos del sistema de conductos radiculares, es esencial para el éxito en endodoncia. La desinfección del canal radicular mediante la irrigación e instrumentación es el factor más importante en la prevención y tratamiento de la periodontitis apical. Al ser imposible con la instrumentación llegar a todas las áreas del sistema de conductos, la irrigación cobra especial importancia. Por este motivo, en la última década se han desarrollado una serie de sistemas de dispensación y agitación de irrigantes, tales como los ultrasonidos. En concreto, en este artículo de revisión se evalúa la información disponible de los diez últimos años sobre la efectividad de los sistemas ultrasónicos para eliminar bacterias, tejido pulpar, restos de dentina y barrillo dentinario, la capacidad de estos dispositivos para hacer que el irrigante penetre en el sistema de conductos radiculares y la seguridad en su uso. Los resultados de la revisión muestran que los sistemas ultrasónicos son más eficaces en el desbridamiento químico, biológico y físico del sistema de conductos radiculares que los sistemas de irrigación convencional, a la vez que son seguros.

  8. Capacidade de remoção da smear layer das paredes do canal radicular utilizando o vinagre de álcool e o vinagre de maçã como soluções irrigadoras durante a terapia endodôntica

    OpenAIRE

    Luis Eduardo Duarte Irala; Renata Grazziotin Soares; Alcebíades Nunes Barbosa; Alice Rorig; Jaqueline Peter

    2009-01-01

    The authors analyzed by scanning electron microscopy (SEM) the capacity to remove smear layer of dentin root canal wall after endodontic treatment. The study used premolars extracted human teeth. ProTaper System (Dentsply Maillefer) was used to endodontic instrumentation helpful by five irrigants solutions: sodium hypochlorite 1% + EDTA; sodium hypochlorite 1% + vinegar of apple; vinegar of apple; sodium hypochlorite 1% + vinegar of alcohol and vinegar of alcohol. Root longitudinal-sections w...

  9. canal24

    Data.gov (United States)

    California Department of Resources — Canal system center lines in the Central Valley of California and adjacent areas captured from 1:24,000-scale USGS topographic maps. Updates and modifications made...

  10. Manejo de conductos radiculares con curvatura marcada

    OpenAIRE

    Jorge Mario Nuñez Duran

    2013-01-01

    Las variaciones anatómicas en dientes con conductos que poseen dilaceraciones hacen del tratamiento de endodonciaun reto o una complicación relativa, en donde el clínico debe desarrollar toda su habilidad y el uso de instrumentosespeciales que faciliten u optimicen la terapia de conductos radiculares. La toma de radiografías previas con diferentesangulaciones y el estudio minucioso de ellas, darán una ayuda fundamental para conocer más detalladamente estacomplicación anatómica, que en algunos...

  11. Microporous, demineralized collagen matrices in intact radicular dentin created by commonly used calcium-depleting endodontic irrigants.

    Science.gov (United States)

    Tay, Franklin R; Gutmann, James L; Pashley, David H

    2007-09-01

    The use of calcium-depleting solutions in restorative dentistry results in demineralization of intact coronal dentin beneath smear layers. Likewise, application of calcium-depleting irrigants as final rinses might create demineralized collagen matrices in intact radicular dentin after removal of root canal wall smear layers created during canal shaping. These unsupported collagen matrices collapse on desiccation and might be difficult to detect in scanning electron microscopy dehydration techniques traditionally used in endodontic research. Demineralized collagen matrices were identified, by using a hexamethyldisilazane dehydration protocol, on the surface of smear layer-depleted radicular dentin when NaOCl was used as initial rinse, followed by the use of 17% ethylenediaminetetraacetic acid or BioPure MTAD as the final rinse. Compaction of conventional root filling materials over a demineralized collagen matrix in instrumented dentin is analogous to performing the same procedure against the predentin collagen network in the uninstrumented parts of root canals. The potential consequences of this process are, however, unknown.

  12. DE CANALES

    Directory of Open Access Journals (Sweden)

    Roberto Carlos Guevara C.

    2013-01-01

    Full Text Available La amplia utilización de redes WiFi en los diversos escenarios sociales está generando una especie de saturación de canales, que a su vez ocasiona interferencia entre estas redes. Esta situación genera solapamiento de canales, lo que hace que las tasas de trasferencia se reduzcan. En este artículo se detalla esta situación, y se estructura y aplica un experimento para encontrarle solución al problema. También se presentan los resultados tabulados y graficados utilizando la herramienta de software libre inSSider.

  13. Computed tomography in lumbar canal stenosis. Relationship between its findings and clinical symptoms

    Energy Technology Data Exchange (ETDEWEB)

    Ohta, Shu; Baba, Itsushi; Ishida, Akihisa; Sumida, Tadayuki; Sasaki, Seishu (Hiroshima Shiritsu Asa Shimin Hospital (Japan))

    1984-09-01

    Preoperative CT was done in 39 patients with lumbar canal stenosis. Marked symmetrical narrowing of the whole vertebral canal was seen in the group with nervous symptoms in the cauda equina. Deformed bilateral intervertebral joints were seen in the group with both nervous symptoms in the cauda equina and radicular sciatica. The lateral recess on the affected side was markedly narrowed by the projection of the upper and lower joints and herniation. In the group with radicular sciatica, the vertebral canal itself was not so narrowed, but the unilateral intervertebral joint was extremely deformed, causing a narrowing of the lateral recess. There were large differences in the angle of the left and right intervertebral joints.

  14. Radicular anatomy of permanent mandibular second molars in an Iranian population: A preliminary study

    Science.gov (United States)

    Akhlaghi, Nahid M.; Abbas, Fatemeh Mashadi; Mohammadi, Mostafa; Shamloo, Mohammad Reza Karami; Radmehr, Orkideh; Kaviani, Ramin; Rakhshan, Vahid

    2016-01-01

    Background: Root morphology is of utmost importance to endodontic sciences. Since there are a few studies on the morphology of mandibular second molars' roots, and some anatomical variables are not evaluated before, the aim of this study was to investigate thoroughly radicular anatomy of this tooth. Materials and Methods: This ex vivo study was performed on 150 intact mandibular second molars. After access cavity preparation and ensuring canal patency, Indian ink was injected into root canals from the orifices. The teeth became transparent using methyl salicylate storage. Then, they were inspected by an endodontist under a ×10 stereomicroscope regarding numerous root morphological variables. Data were analyzed using chi-square test and analysis of variance (α = 0.05). Results: About 86.7% of teeth had two roots and 13.3% were single-rooted (P = 0.0001), of which, 50% were C-shaped (6.7% of all teeth, P = 0.0001). 86.7% of mesial roots were double canalled, whereas 75.3% of distal roots were single canalled (P = 0.0001). 71.45% and 95.3% of the mesial and distal roots had one apical foramen, respectively (P = 0.0001). Apical foramens were mostly central followed by lingual in most cases. Distances between apical foramen and apical constriction ranged between 0.27 and 0.40 mm (P = 0.0545). Distances between apical foramen and root apices ranged between 0.30 and 0.47 mm (P = 0.0001). Vertucci classifications of mesial canals were Type II in 62.6% and Type IV in 37.4%. 86.2% of single-canal distal roots were Type I. 66.7% of double-canal distal roots were Type II and 33.3% were Type IV (P = 0.0001). The mean root lengths from cervical to apex of mesial, distal, and single roots were 14.02 ± 0.85 (95% confidence interval [CI] = 13.87–14.17), 13.35 ± 0.91 (95% CI = 13.19–13.50), and 14.25 ± 0.72 mm (95% CI = 13.91–14.58), respectively. The extents of canal curvatures varied between 20° and 31° buccolingually (P = 0.0000), and between 19° and 27

  15. Produção de matéria seca, crescimento radicular e absorção de cálcio, fósforo e alumínio por coffea canephora e coffea arabica sob influência da atividade do alumínio em solução Dry matter production, root growth and calcium, phosphorus and aluminum absorption by coffea canephora and coffea arabica under influence of aluminum activity in solution

    Directory of Open Access Journals (Sweden)

    Edson Marcio Mattiello

    2008-02-01

    Full Text Available Este trabalho teve como objetivo avaliar a produção de matéria seca, o crescimento radicular e a absorção e distribuição do Ca, P e Al nas folhas, no caule e nas raízes de dois clones de café conilon (Coffea canephora (Mtl 25 e Mtl 27 e de uma variedade de café Catuaí Amarelo (Coffea arabica, cultivados em solução nutritiva com atividade crescente de Al3+. As plantas foram cultivadas em vasos com capacidade para 5 L, contendo solução nutritiva de Hoagland & Arnon, modificada. Após oito dias de adaptação, as plantas foram submetidas a concentrações de Al de 0, 500, 1.000 e 2.000 µmol L-1, que corresponderam a atividades de Al3+ em solução, estimadas pelo software GEOCHEM, de 20,68, 50,59, 132,9 e 330,4 µmol L-1, respectivamente. Foram determinados os teores de Ca, Al e P na planta. O sistema radicular foi separado, para determinação da área e do comprimento. A variedade Catuaí Amarelo (Coffea arabica apresentou-se menos sensível ao Al3+, quando comparada aos clones de conilon (Coffea canephora. O clone de conilon Mtl 25 foi menos sensível ao Al3+ em relação ao Mtl 27. O aumento da atividade de Al3+ promoveu redução nos teores de P e Ca nas folhas e raízes do cafeeiro, especialmente nos clones Mtl 25 e Mtl 27. O acúmulo de Al no sistema radicular e a restrição do transporte para a parte aérea são importantes fatores na tolerância de plantas ao Al3+.This study had the objective of evaluating the dry matter production, root growth, and the absorption and distribution of Ca, P and Al in the leaves, stem and roots of two Conilon (Coffea canephora coffee clones (Mtl 25 and Mtl 27 and the coffee variety Catuaí Amarelo (Coffea arabica grown in nutrient solution with increasing Al3+ activity. The plants were cultivated in 5 L pots, containing modified Hoagland & Arnold nutrient solution. After eight days of adaptation, the plants were subjected to Al concentrations of 0, 500, 1.000 and 2.000 mol L-1, which

  16. Alternative adhesive strategies to optimize bonding to radicular dentin.

    Science.gov (United States)

    Bouillaguet, Serge; Bertossa, Bruno; Krejci, Ivo; Wataha, John C; Tay, Franklin R; Pashley, David H

    2007-10-01

    This study tested the hypothesis that bond strengths of filling materials to radicular dentin might be optimized by using an indirect dentin bonding procedure with an acrylic core material. Roots of human teeth were endodontically prepared and obturated with EndoREZ, Epiphany, or the bonding of an acrylic point with SE Bond by using a direct or an indirect bonding technique. Bond strengths of endodontic sealers to radicular dentin were measured with a thin slice push-out test. Push-out strengths of EndoREZ and Epiphany to radicular dentin were less than 5 megapascals (MPa). The direct bonding technique with acrylic points and the self-etching adhesive had push-out strengths of 10 MPa, increasing to 18 MPa with the indirect technique. The use of the indirect bonding protocol with an acrylic point to compensate for polymerization stresses appears to be a viable means for optimizing bond strengths of endodontic filling materials to radicular dentin.

  17. Sacral radicular cysts in autosomal dominant polycystic kidney disease.

    Science.gov (United States)

    Peces, Ramón; Peces, Carlos; Pérez-Dueñas, Virginia; Vega-Cabrera, Cristina; Campos, Isabel

    2009-10-01

    This is the first report of a case of sacral radicular cysts in a patient with autosomal dominant polycystic kidney disease (ADPKD). A 46-year-old woman with ADPKD was found to have bilateral sacral radicular cysts discovered incidentally by magnetic resonance imaging (MRI). Cysts arising from arachnoid or spinal meningeal sac should be considered one of the manifestations of a more widespread connective tissue disorder associated with ADPKD.

  18. Propriedades do solo e sistema radicular do feijoeiro irrigado em rotação de culturas

    Directory of Open Access Journals (Sweden)

    E. B. Wutke

    2000-09-01

    Full Text Available O crescimento do sistema radicular do feijoeiro irrigado, cultivar IAC-Carioca, sob pivô central, em rotação com pousio, milho, aveia preta, Crotalaria juncea L., guandu (Cajanus cajan (L. Millsp. e mucuna preta (Mucuna aterrima, no período não-convencional de cultivo no outono-inverno, foi avaliado de 1993 a 1995, em Latossolo Vermelho eutroférrico típico, em área experimental do Instituto Agronômico, em Ribeirão Preto, São Paulo. A rotação de culturas do feijoeiro com milho e adubos verdes favoreceu a redução da resistência do solo à penetração na camada arável, garantiu a manutenção do teor de matéria orgânica do solo, bem como possibilitou a redução da acidez e o aumento do índice de saturação por bases (V% em profundidade em relação ao teor inicial. A velocidade de infiltração básica da água no solo foi favorecida pela inclusão da mucuna preta, da Crotalaria juncea L. e do milho, no esquema de rotações. A profundidade efetiva observada do seu sistema radicular foi de 0,35 a 0,40 m.

  19. Influência da contaminação do substrato na resistência adesiva de pinos de fibra à dentina radicular

    OpenAIRE

    Mesquita,Gabriela Campos

    2010-01-01

    O objetivo presente estudo foi avaliar duas hipóteses: a primeira de que a resistência de união entre pinos de fibra de vidro e a dentina radicular mediada por cimento resinoso convencional ou autoadesivo é influenciada pelo tempo decorrido entre a obturação endodôntica e o preparo do canal radicular. A segunda de que o tipo de cimento provisório e o momento do preparo do espaço para o pino (antes do procedimento provisório ou após a remoção deste) influenciem a adesão de pinos de fibra a den...

  20. Fracture resistance of endodontically treated teeth with different direct corono-radicular restoration methods

    Science.gov (United States)

    Moosavi, Horieh; Manari, Fatemeh

    2017-01-01

    Background Endodontically treated teeth are widely considered to be more susceptible to fracture than vital teeth. Obturation procedures and post placement have been a main cause of vertical root fracture. Material and Methods Forty-eight human premolars with standardized weakened roots were endodontically treated and allocated to four experimental groups (n=12). After root canal treatment, in group 1, fiber posts #1 were cemented in root canals using Estelite Core Quick, and the crowns were restored with resin composite. For group 2 and 3, the roots and crowns were restored using a light-cured and self-cured adhesive and resin composites respectively. In group 4, it was used the Panavia F 2.0 resin cement and resin composite for corono-radicular reconstruction. In group 5, the teeth remained untouched. After 24 hours storage and 1000 thermocycles, samples were loaded at a cross head speed of 1 mm per minute. Results A significant difference was observed in fracture resistance among groups 4 and 5 compared to other groups. Conclusions Root reconstruction with fiber post and Panavia resin cement, and crown building using light-cured resin composite resulted in increased fracture resistance equal to that of intact teeth. Key words:Fracture resistance, fiber post, resin cement, resin composite. PMID:28298991

  1. Effectiveness of conservative treatments for the lumbosacral radicular syndrome: A systematic review

    NARCIS (Netherlands)

    P.A.J. Luijsterburg (Pim); A.P. Verhagen (Arianne); R.W.J.G. Ostelo (Raymond); T.A.G. van Os (Ton); W.C. Peul (Wilco); B.W. Koes (Bart)

    2007-01-01

    textabstractPatients with a lumbosacral radicular syndrome are mostly treated conservatively first. The effect of the conservative treatments remains controversial. To assess the effectiveness of conservative treatments of the lumbosacral radicular syndrome (sciatica). Relevant electronic databases

  2. Manejo de conductos radiculares con curvatura marcada

    Directory of Open Access Journals (Sweden)

    Jorge Mario Nuñez Duran

    2013-10-01

    Full Text Available Las variaciones anatómicas en dientes con conductos que poseen dilaceraciones hacen del tratamiento de endodonciaun reto o una complicación relativa, en donde el clínico debe desarrollar toda su habilidad y el uso de instrumentosespeciales que faciliten u optimicen la terapia de conductos radiculares. La toma de radiografías previas con diferentesangulaciones y el estudio minucioso de ellas, darán una ayuda fundamental para conocer más detalladamente estacomplicación anatómica, que en algunos casos es muy frecuente. El uso de instrumental más flexible y resistentepermite llegar con mayor precisión y seguridad a la parte apical sin que se corra el riesgo de fracturar los instrumentos,limpiándolos y modelándolos en toda su extensión para poder obturarlos de una manera correcta.El uso de limas de menor calibre, precurvadas, permite acceder a la porción dilacerada de la raíz. Este es un métodoeficaz para prevenir la perdida de longitud de trabajo y evitar así las perforaciones de las raíces durante la preparación.Dentro de los errores más comunes durante la instrumentación de los conductos está la perdida de longitud detrabajo, junto con la transportación del foramen apical, ya sea de manera externa o interna. En el presente artículose menciona el uso de nuevas y mejores técnicas usadas para poder evitar este tipo de errores y se muestra un casoclínico del manejo de un molar superior con una curvatura de 40 grados que fue preparado y obturado exitosamentecon el sistema Protaper (Dentsply- maillefer.

  3. Efeito da temperatura radicular na resistência ao movimento de água no cacaueiro (Theobroma cacao L. Radicular temperature effects in water movement resistence in cacao tree (Theobroma cacao L.

    Directory of Open Access Journals (Sweden)

    Solange Maria Costa de Amorim

    1992-07-01

    Full Text Available O efeito da temperatura radicular na resistência ao movimento de água foi estudada em plântulas de cacau (Theobroma cacao L. cv. Catongo sob condições de casa de vegetação e a temperaturas radiculares de 10, 20, 30 e 40ºC, em folhas cobertas com papel de alumínio e sacos de polieteileno preto e em folhas descobertas. As folhas estavdf am localizadas na parte basal, intermediária e apical do caule. Mediram-se trocas gasosas foliares utilizando o sistema portátil de fotossíntese LI-6000. O potencial hídrico e o osmótico foram mensurados por psicrometria. O potencial de turgor foi estimado por diferença entre o potencial hídrico e o osmótico. Os resultados obtidos sugerem que a resistência ao movimento de água nas plântulas de cacau depende do fluxo transpiracional e que a variação dos gradientes do potencial hídrico na planta é determinada por temperaturas radiculares maiores de 30ºC. As trocas gasosas, a temperaturas radiculares diferentes, dependem do estado hídrico da planta.The effects of root temperature on water movement resistance were studied on cacao (Theobroma cacao L. cv Catongo seedlings under greenhouse conditions at root temperatures of 10, 20 30 and 40ºC, on leaves covered with aluminum foil and black plastic bags and on uncovered leaves. The leaves were located at the base, intermediates part and apex of the stem. Gas exchange measurements were done utilizing a LI-6000 portable photosynthetic system. Water and osmotic potential were measured by psychrometry. Turgor potential was estimated as the difference between water potential and osmotic potential. The results suggested that the resistance to water movement depends on the transpirational flux and that the water potential gradients across the plant vary at temperatures greater than 30ºC. Gas exchanges, at diferent root temperature, depend on the water status of the plant.

  4. Fracturas radiculares en pacientes adultos: propuesta de tratamiento actual

    OpenAIRE

    Francisco Javier Verdugo-Avello; Edgardo González; Christian Pedemonte; Ilich Vargas

    2014-01-01

    Objetivo: El objetivo de este estudio fue ver la prevalencia y la evolución del tratamiento en las fracturas radiculares en pacientes adultos laboralmente activos que sufrieron un trauma dentoalveolar y presentar un protocolo de tratamiento distinto basándose en el pronóstico a largo plazo según nuestros porcentajes de éxito. Materiales y métodos: Se realizó una revisión retrospectiva de los casos de trauma dentoalveolar y específicamente de fracturas radiculares que acudieron a la Unidad ...

  5. Metaplastic changes in the epithelium of radicular cysts: A series of 711 cases

    Science.gov (United States)

    Rosen, Eyal; Dubinsky, Liz; Buchner, Amos; Vered, Marilena

    2016-01-01

    Background This study was aimed to evaluate the prevalence of metaplastic changes in the epithelium of radicular cysts and to investigate how they relate to the clinical and radiographic characteristics of the cysts, based on a large series of radicular cysts. Material and Methods Biopsies of cysts of endodontic origin that were examined at the Department of Oral Pathology between 2004 and 2011 have been re-evaluated for this study. Only cases that were re-confirmed with clinical and histological diagnoses of a radicular or residual radicular cyst were included. The included cases were evaluated for the prevalence of metaplastic changes in the form of mucous secreting cells (MSC) or ciliated cells (CC). The relations between the metaplastic changes and the cyst type (radicular or residual radicular), as well as demographic, clinical and radiographic parameters, were statistically evaluated using Fischer and chi-square tests. Significance was set at p<0.05. Results A total of 711 cysts were included: 677 were radicular cysts (95%) and 34 (5%) were residual radicular cysts. 23 cases had histopathological diagnoses other than radicular or residual radicular cysts and were excluded from the study. MSC were present in 47 (6.6%) cysts. MSC were significantly more common in residual radicular cysts than in radicular cysts [8 (23.5%) and 39 (5.8%), respectively; p<0.001]. MSC-containing cysts were commonly found in asymptomatic patients (10.5%, p<0.001), and usually presented with well-defined radiographic borders (7.2%, p<0.05). CC were present in 34 (4.8%) cysts, with a markedly high prevalence in the maxillary molar sextant (15%, p<0.001). Conclusions In the epithelium of radicular and residual radicular cysts the presence of specific metaplastic changes may be related to cyst type, symptomatology, radiographic findings and tooth location. Key words:Radicular cyst, metaplasia, mucous secreting cells, ciliated cells. PMID:27957265

  6. Estudio comparativo de las distintas soluciones antisépticas, utilizadas durante la preparación quirúrgica de los conductos radiculares

    OpenAIRE

    1999-01-01

    Por las décadas del 50 y 60, los tratamientos endodónticos insumían demasiado tiempo, usualmente eran necesarias entre dos y cinco sesiones para completar una terapia. Los mismos se hacían tediosos sobre todo en la esterilización del conducto, ya que este proceso involucraba la toma de cultivos intraductales. Lamentablemente, pronto se observó que los cultivos negativos no reflejaban necesariamente el verdadero estado del canal radicular, entonces la importa de estos cultivos comenzó a dismin...

  7. Evidence-based practice regarding the lumbosacral radicular syndrome

    NARCIS (Netherlands)

    P.A.J. Luijsterburg (Pim)

    2006-01-01

    textabstractThe lumbosacral radicular syndrome causes pain in the leg and disability, often resulting in utilisation of healthcare resources and absenteeism from work. In general practice this syndrome is the most frequently seen specific low-back disorder. The aim of the research described in this

  8. The effects of various irrigating solutions on intra-radicular dentinal surface: An SEM analysis

    Directory of Open Access Journals (Sweden)

    J V Karunakaran

    2012-01-01

    Full Text Available Aim: The action of irrigant solutions on intra- radicular dentinal surface were evaluated in an in vitro setting using a scanning electron microscope (SEM and it was observed that sodium hypochlorite and MTAD produced the cleanest surface and that none of the irrigants were able to produce an ideal preparation of the dentinal surface when used individually. The primary objective of endodontic therapy is to achieve a clean, optimal environment in root canals to avoid unsuccessful treatment outcomes. The complexities of the root canal system necessitate the use of irrigating solutions which act on radicular dentin surface, modifying it. The action of irrigants can be beneficial, and yet at the same time, as they modify the surface structure of dentin, they can have an adverse impact on the properties of dentin. The present study was undertaken to assess the effect of various irrigants on the dentinal surface using an SEM. Materials and Methods: Forty-five roots were randomly divided into nine groups (n=5 and prepared by sectioning at the level of cemento-enamel junction (CEJ and 10 mm from the CEJ and split longitudinally. The dentin surface was prepared and the cemental surfaces were coated with double layer of varnish. The irrigants tested were normal saline, de-ionized water, 17% ethylenediaminetetraacetic acid (EDTA, 5% sodium hypochlorite (NaOCl, 5% NaOCl with ultrasonic agitation, 3% hydrogen peroxide, 2% chlorhexidine (CHX, MTAD, and MTAD with ultrasonic agitation. The prepared samples were placed in the irrigant solution for 3 min, subsequently dehydrated, sputter coated, and observed under SEM. The images were subsequently analyzed for dentinal surface changes. Results: 17% EDTA and MTAD produced the cleanest dentinal surface. Ultrasonic agitation enhanced the effect of irrigants. 5% NaOCl and 3% hydrogen peroxide were efficient at removal of organic debris, but were unable to remove the smear layer. De-ionized water, normal saline, and 2

  9. Localización de conductos radiculares: Visión directa versus microscopio quirúrgico. Estudio in-vitro.

    Directory of Open Access Journals (Sweden)

    Gabriela Sanchez

    2012-07-01

    Full Text Available La incapacidad para identificar adecuadamente la entrada al sistema de conductos radiculares, principales y accesorios, es una de las causas de la falla endodóntica. Nace la necesidad de incorporar nuevas tecnologías que permitan mejorar la visibilidad a la cavidad de acceso para la localización de la entrada de los conductos radiculares. El objetivo del presente estudio fue comparar si existe una diferencia entre la localización de conductos radiculares de molares permanentes humanos a través de visión directa y con el uso del microscopio quirúrgico. Se examinaron 100 molares permanentes humanos extraídos, por visión directa y luego usando un microscopio quirúrgico, para determinar el número de conductos radiculares localizados. La diferencia se estableció con la obtención del número real de conductos al realizar el corte radicular. El presente estudio indicó que el número de conductos localizados aumenta en un 11% con el uso del microscopio quirúrgico, lo que se refleja en especial en conductos accesorios, lo cual concuerda con otros estudios realizados al respecto. Se puede concluir con este estudio que con el uso del microscopio quirúrgico se localizaron un mayor número de conductos en relación al uso de visión directa y por lo tanto se considera como una herramienta muy útil que ayuda al clínico en el tratamiento endodóntico convencional, ofreciendo un campo operatorio perfectamente iluminado y magnificado, visualizando con gran detalle, el piso de la cámara y la entrada a todos los conductos radiculares, lo que constituye la llave del éxito en endodoncia. Abstract: The inability to properly identify the entrance to the root system, main and accessories, is one of the causes of endodontic failure. Hence arises the need to incorporate new technologies to improve the visibility of the access cavity to the location of the entrance to one of the root. The purpose of this study was to compare whether there is a

  10. Eosinophilic granuloma in the anterior mandible mimicking radicular cyst

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Byung Do; Lee, Wan; Lee, Jun [College of Dentistry, Wonkwang University, Iksan (Korea, Republic of); Son, Hyun Jin [Dept. of Pathology, School of Medicine, Eulji University, Daejeon (Korea, Republic of)

    2013-06-15

    Eosinophilic granuloma is a common expression of Langerhans cell histiocytosis and corresponds with typical bone lesions. The radiographic appearance of eosinophilic granuloma in the jaw is variable and not specific. It may resemble periodontitis, radicular cyst, or malignancies. The purpose of this report is to describe the characteristic radiographic features of eosinophilic granuloma of a 39-year-old male. The lesion in the anterior mandible was first diagnosed as radicular cyst because the radiographic findings were ovoid radiolucent lesion with well-defined border. However, careful interpretation revealed a non-corticated border and floating tooth appearance that were the characteristic radiographic features for the differential diagnosis. Early clinical signs of eosinophilic granuloma can occur in the jaw and a bony destructive lesion might be mistaken for periodontitis or an odontogenic cystic lesion; therefore, careful interpretation of radiographs should be emphasized.

  11. Distribuição do sistema radicular de uma cultura de aveia forrageira

    Directory of Open Access Journals (Sweden)

    Fante Jr. Lorival

    1999-01-01

    Full Text Available Avaliou-se a distribuição das raízes de uma aveia forrageira através da aplicação dos métodos do anel volumétrico, da placa com pregos, do trado e do auxiliado por processamento de imagens. A aveia forrageira foi cultivada em latossolo vermelho-escuro, sob dois tratamentos distintos em função da manutenção da capacidade de água disponível no solo (CAD: tratamento 1 - 50% da CAD; tratamento 2 - 80% da CAD. Foram realizadas 3 amostragens, aos 25, 60 e 115 dias após a emergência. As raízes da aveia forrageira concentraram-se nas camadas iniciais do solo, cerca de 90% entre 0 a 20 cm. Os resultados encontrados para a quantificação das raízes variaram com o tratamento, a metodologia e a época de amostragem. Verificou-se a existência de correlações entre os resultados determinados a partir das grandezas massa seca de raiz e presença radicular. A variabilidade da distribuição das raízes no solo foi dependente do método de avaliação utilizado. Os menores valores dos coeficientes de variação foram observados para o método do trado, indicando que a menor variabilidade da distribuição das raízes tem maior relação com o volume da amostra do que com o número de pontos amostrados.

  12. Interacciones radiculares en sistemas agroforestales: mecanismos y opciones de manejo

    Directory of Open Access Journals (Sweden)

    F. Casanova

    2007-01-01

    Full Text Available Los sistemas agroforestales (SAF son una forma de uso de la tierra en donde las leñosas interactúan con los cultivos y/o animales, con la finalidad de diversificar y optimizar la producción de manera sostenida. Sin embargo, estos sistemas tienen limitantes originados por una combinación inadecuada de las diferentes especies, lo que resulta en competencia entre ellas. Las características radiculares de las especies leñosas tienen un papel importante en el éxito de los SAF, ya que indican modificaciones que pudieran existir entre especies asociadas. Por tanto, el objetivo de esta revisión es analizar la importancia de las interacciones radiculares, los criterios para el manejo con base en las características morfológicas y patrones de crecimiento entre especies y su impacto en los SAF. La incorporación de especies arbóreas dentro de los cultivos requiere de objetivos claros; es decir, conocer el papel que desempeñarían dentro del sistema. No es redituable utilizar especies arbóreas que no poseen cierto valor o producto, ya que la competencia entre los árboles y los cultivos es solamente admisible si es compensada a través de porlas ventajas con relación a los aumentos en la productividad de sistema. Son deseables aquellas especies arbóreas cuyas raíces sean agresivas con relación a los sistemas radiculares del cultivo asociado, y que manifiesten un crecimiento lateral profundo y/o posean una alta plasticidad. Una opción para reducir la competencia radicular es la regulación del espaciamiento y/o distribución de las diversas especies asociadas, así como la aplicación de prácticas de manejo. Los patrones de la actividad radicular de las plantas difieren entre especies, su conocimiento puede ayudar a evitar competencia excesiva y pérdidas de nutrientes en SAF con la asignación óptima del espacio y recursos disponibles.

  13. Radicular cyst associated with deciduous molar: A report of a case with an unusual radiographic presentation

    Directory of Open Access Journals (Sweden)

    Sulabha A Narsapur

    2012-01-01

    Full Text Available Radicular cysts arising from deciduous teeth are rare. This article presents a case report of a radicular cyst associated with a mandibular deciduous second molar and with unusual radiographic findings. The second premolar was displaced to the lower border of the mandible, below the first premolar. The management comprised enucleation of the cystic sac under local anesthesia.

  14. Reparacion espontánea de fractura radicular horizontal

    OpenAIRE

    2013-01-01

    Resumen Se reporta un caso clínico de una fractura radicular horizontal en un central superior izquierdo, que reparó espontáneamente sin tratamiento dental alguno. La fractura se diagnosticó catorce años después de recibir el trauma, en un examen radiográfico rutinario de la consulta endodóntica, ya que el diente sin ninguna sintomatología presentaba al examen clínico cambio de color y al examen radiográfico se observaba zona radiolúcida en la zona apical, por lo que fue remitida del posgrado...

  15. The Root Canal Biofilm

    NARCIS (Netherlands)

    Sluis, van der L.W.M.; Boutsioukis, C.; Jiang, L.M.; Macedo, R.; Verhaagen, B.; Versluis, M.; Chávez de Paz, E.; Sedgley, C.M.; Kishen, A.

    2015-01-01

    The aims of root canal irrigation are the chemical dissolution or disruption and the mechanical detachment of pulp tissue, dentin debris and smear layer (instrumentation products), microorganisms (planktonic or biofilm), and their products from the root canal wall, their removal out of the root cana

  16. Root canal irrigation

    NARCIS (Netherlands)

    L. van der Sluis; C. Boutsioukis; L.M. Jiang; R. Macedo; B. Verhaagen; M. Versluis

    2015-01-01

    The aims of root canal irrigation are the chemical dissolution or disruption and the mechanical detachment of pulp tissue, dentin debris and smear layer (instrumentation products), microorganisms (planktonic or biofilm), and their products from the root canal wall, their removal out of the root cana

  17. Investigations of radicular dentin permeability and ultrastructural changes after irradiation with Er,Cr:YSGG laser and dual wavelength (2780 and 940 nm) laser.

    Science.gov (United States)

    Al-Karadaghi, Tamara Sardar; Franzen, Rene; Jawad, Hussein A; Gutknecht, Norbert

    2015-11-01

    The aim of this study was to assess the effectiveness of dual wavelength (2780 nm Er,Cr:YSGG, 940 nm diode) laser in elimination of smear layer comparing it with Er,Cr:YSGG laser in terms of radicular dentin permeability and ultrastructural changes of root canal walls. Fifty-one sound single-rooted extracted teeth were instrumented up to size F4 and divided into three groups: group Co, non-irradiated samples; group A, irradiated with Er,Cr:YSGG laser; group B, irradiated with the dual wavelength laser. Afterward, the roots were made externally impermeable, filled with 2% methylene blue dye, divided horizontally into three segments reflecting the cervical, middle, and apical thirds then examined under microscope. Using analytical software, the root section area and dye penetration area were measured, and then, the percentage of net dye penetration area was calculated. Additionally, scanning electron microscope investigations were accomplished. Analysis of variance (ANOVA) showed significant differences between all groups over the three root thirds. Dye permeation in dual wavelength laser group was significantly higher over the whole root length: cervical, middle, and apical compared to Er,Cr:YSGG laser group and non-irradiated samples (p laser root canal irradiation produced uneven removal of smear layer, in efficient cleanliness especially in the apical third. There was no sign of melting and carbonization. Within the studied parameters, root canal irradiation with dual wavelength laser increased dentin permeability.

  18. Design of canals

    CERN Document Server

    Swamee, P K

    2015-01-01

    The book presents firsthand material from the authors on design of hydraulic canals. The book discusses elements of design based on principles of hydraulic flow through canals. It covers optimization of design based on usage requirements and economic constraints. The book includes explicit design equations and design procedures along with design examples for varied cases. With its comprehensive coverage of the principles of hydraulic canal design, this book will prove useful to students, researchers, and practicing engineers. End-of-chapter pedagogical elements make it ideal for use in graduate courses on hydraulic structures offered by most civil engineering departments across the world.

  19. Organogênese do caquizeiro a partir de segmentos radiculares

    Directory of Open Access Journals (Sweden)

    Carvalho Dayse Cristina de

    2004-01-01

    Full Text Available A produção de mudas de caquizeiro (Diospyros kaki pelo processo da enxertia sobre porta-enxertos provenientes de sementes, ocasiona problemas de desuniformidade vegetativa. O objetivo do trabalho foi contribuir para o desenvolvimento de um protocolo para a regeneração de brotações de caquizeiro do tipo café, a partir de raízes por organogênese indireta. Segmentos radiculares obtidos de embriões germinados in vitro foram isolados de sementes de frutos maduros em meio MSfraction one-halfNO3. As sementes receberam assepsia pela imersão em etanol 70% por um minuto, em solução de hipoclorito de sódio 2,5% por 20 minutos e quatro lavagens em água esterilizada. No primeiro experimento, os segmentos radiculares de 2cm foram isolados em meio de cultura MSfraction one-halfNO3 acrescido de 0,01mM de ácido indolacético e quatro tipos de citocininas nas concentrações 1 e 10mM: zeatina, 6-benzilaminopurina, 2-isopenteniladenina e thidiazuron. No segundo experimento, para o enraizamento das brotações, foram testados quatro períodos de permanência em meio com 10mM de ácido indolbutírico: 0, 5 10 e 15 dias. A maior regeneração de brotos (1,2 brotos por explante ocorreu na combinação 1mM de zeatina com 0,01mM de ácido indolacético. As brotações juvenis obtidas possuem potencial natural para o enraizamento, sendo necessário novos estudos para confirmar o efeito da aplicação de auxinas.

  20. Facial middle-third root fracture. A case report Fractura radicular del tercio medio dentario. Presentación de un caso

    Directory of Open Access Journals (Sweden)

    Nestor Rodríguez Cruz

    2010-12-01

    Full Text Available Horizontal root fracture is a rare dental trauma the general dentist is not always appropriately trained for. This article presents an horizontal root fracture of the facial upper central middle-third with incomplete apical formation in an 8 years old, male patient, who came to our consultation a month after the dental trauma had occurred. The latest procedures, consisting on the exclusive instrumentation and treatment of the coronal segment, and the exclusive use of calcium hydroxide as irrigantion fluid and intracanal medicament by taking profits of its capacity to induce hard tissue were used. This procedure was reactivated every 15 days and clinical-radiographic controls were performed every 3 months to monitor progress in the root apex formation. When apex formation was completed it was decided to seal the root canal with gutta-percha by using the conventional lateral condensation technique. It was decided to publish this case report first of all because it is a condition that, unlike what happened with this specific patient, does not always progress successfully and because an unconventional treatment, with positive results in year and a half was applied.La fractura radicular horizontal es un traumatismo dental poco frecuente para lo cual el estomatólogo general no está siempre adecuadamente entrenado. El trabajo que se presenta constituyó un caso de fractura radicular horizontal en el tercio medio del incisivo central superior derecho con incompleta formación apical, en un paciente masculino de 8 años de edad que acudió a consulta después de un mes de haber ocurrido el trauma dental. Se utilizaron los procedimientos más novedosos, consistentes en la exclusiva instrumentación y tratamiento del segmento coronal; el uso exclusivo de hidróxido de calcio como sustancia irrigadora y como pasta intraconducto, utilizando su capacidad inductora de tejidos duros. Este proceder fue reactivado cada 15 días, con controles cl

  1. Immunohistochemical expression of vascular endothelial growth factor and matrix metalloproteinase-9 in radicular and residual radicular cysts

    Directory of Open Access Journals (Sweden)

    Patrícia Alvarez Ruiz

    2010-12-01

    Full Text Available OBJECTIVE: This study assessed and compared the immunoexpression of vascular endothelial growth factor (VEGF and matrix metalloproteinase-9 (MMP-9 in radicular cysts (RCs and residual radicular cysts (RRCs, relating them to the angiogenic index and the intensity of the inflammatory infiltrate. MATERIAL AND METHODS: Twenty RCs and 10 RRCs were evaluated by immunohistochemistry using anti-VEGF and anti-MMP-9 antibodies. The angiogenic index was determined by microvessel count (MVC using anti-von Willebrand factor antibody. RESULTS: The expression of both VEGF and MMP-9 was higher in RCs than in RRCs. RCs and RRCs presented strong epithelial expression of VEGF, irrespective of the intensity of the inflammatory infiltrate. Lesions with strong expression of MMP-9 showed significantly higher number of immunopositive cells for VEGF (p<0.05 and higher MVC (p<0.05. Lesions with dense inflammatory infiltrate exhibited significantly higher MVC (p<0.05 and higher number of immunopositive cells for VEGF (p<0.05. There was a positive correlation between both MVC (p<0.05 and the quantity of immunopositive cells for VEGF (p<0.05, with intensity of the inflammatory infiltrate. In addition, it was observed a positive correlation between the number of immunopositive cells for VEGF and MVC (p<0.05. CONCLUSIONS: VEGF and MMP-9 might play important roles in the angiogenesis in RCs and RRCs. In these lesions, the expression of these molecules and the MVC is closely related to the intensity of the inflammatory infiltrate. The expression of VEGF in the epithelial lining of RCs and RRCs might be important for the enlargement of these lesions.

  2. Resin Adaptation of Radicular Dentin Tubules after Endodontic Instrumentation and Acid Etching.

    Science.gov (United States)

    1983-02-01

    the manuscript. DISCLAIMERS The statements, opinions, and advertisements in the Journal of Endodontics are solely those of the individual authors...I RD-Ai26 872 RESIN ADAPTATION OF RADICULAR DENTIN TUBULES AFTER / I ENDODONTIC INSTRUMENTATION AND ACID ETCHING(U) WALTER I REED ARMY INST OF...Adaptation to Radicular Dentin Tubules SbisoofpeAfter Endodontic Instrumentation and Acid Etching 1982-1983 6. PERFORMING ORG. REPORTNUMBER -, AUTHOR(a) S

  3. Radicular Cyst Associated With a Primary First Molar: A Case Report

    Directory of Open Access Journals (Sweden)

    A. Lotfi

    2011-12-01

    Full Text Available Radicular cysts arising from deciduous teeth are rare. This report presents a case of radicular cyst associated with a primary molar following pulp therapy and discusses the relationship between pulp therapy and the rapid growth of the cyst. The treatment consisted of enucleation of the cyst sac and extraction of the involved primary teeth and 20 months follow up of the patient. Early diagnosis of the lesion would have lead to a less aggressive treatment plan.

  4. The surgery and early postoperative radicular pain in cases with multifocal lumbar disc herniation

    Science.gov (United States)

    Ulutaş, Murat; Çınar, Kadir; Seçer, Mehmet

    2017-01-01

    Abstract Persistence of postoperative radicular pain after surgery for multifocal disc herniation (MFDH) is a clinical problem. This study aims to evaluate the effects of a combined treatment approach compared with unilateral stabilization on early postoperative radicular pain in patients with MFDH. Age, sex, level of operation, clinical findings, and radicular pain visual analogue scale (VAS) scores before surgery in the early postoperative period and at 3 months after surgery were retrospectively reviewed for 20 cases of multifocal lumbar disc herniation. The combined approach (translaminar and far lateral) was used for 13 cases. Seven cases underwent transforaminal lumbar interbody fusion (TLIF) and unilateral transpedicular stabilization following total facetectomy. The mean age of the sample was 49.4 ± 10.1 years and the female-to-male ratio was 8:12. The mean VAS scores for radicular pain in cases treated with the combined approach were 8.2, 4.07, and 2.3 in the preoperative and early postoperative periods and 3 months after surgery, respectively. The mean score for radicular pain improved by 50.4% in the early postoperative period and by 72% in the late postoperative period. The mean VAS scores for radicular pain in cases who underwent TLIF and unilateral stabilization after facetectomy were 8.4, 2.1, and 1.4 in the preoperative and early postoperative periods and 3 months after surgery, respectively. The mean VAS score for radicular pain improved by 75% in the early postoperative period and by 83.3% in the late postoperative period. The combined approach is an effective alternative in cases with MFDH. TLIF and unilateral segmental stabilization provide substantial decompression and eliminate mechanical compression by conserving the height of the intervertebral foramen in the event that sufficient decompression is unable to obtain. We suggest that elimination of chemical mediators, particularly those causing pain in the dorsal ganglion, contributes to

  5. Root Canal Irrigation: Chemical Agents and Plant Extracts Against Enterococcus faecalis

    Science.gov (United States)

    Borzini, Letizia; Condò, Roberta; De Dominicis, Paolo; Casaglia, Adriano; Cerroni, Loredana

    2016-01-01

    Background: There are various microorganisms related to intra and extra-radicular infections and many of these are involved in persistent infections. Bacterial elimination from the root canal is achieved by means of the mechanical action of instruments and irrigation as well as the antibacterial effects of the irrigating solutions. Enterococcus faecalis can frequently be isolated from root canals in cases of failed root canal treatments. Antimicrobial agents have often been developed and optimized for their activity against endodontic bacteria. An ideal root canal irrigant should be biocompatible, because of its close contact with the periodontal tissues during endodontic treatment. Sodium hypoclorite (NaOCl) is one of the most widely recommended and used endodontic irrigants but it is highly toxic to periapical tissues. Objectives: To analyze the literature on the chemotherapeutic agent and plant extracts studied as root canal irrigants. In particularly, the study is focused on their effect on Enterococcus faecalis. Method: Literature search was performed electronically in PubMed (PubMed Central, MEDLINE) for articles published in English from 1982 to April 2015. The searched keywords were “endodontic irrigants” and “Enterococcus faecalis” and “essential oil” and “plant extracts”. Results: Many of the studied chemotherapeutic agents and plant extracts have shown promising results in vitro. Conclusion: Some of the considered phytotherapic substances, could be a potential alternative to NaOCl for the biomechanical treatment of the endodontic space. PMID:28217184

  6. Canals, Bypass Canal, Published in 2002, Duchesne County.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Canals dataset, was produced all or in part from Other information as of 2002. It is described as 'Bypass Canal'. Data by this publisher are often provided in...

  7. Demineralization effect of EDTA, EGTA, CDTA and citric acid on root dentin: a comparative study Efeito do EDTA, EGTA, CDTA e ácido cítrico na desmineralização da dentina radicular: estudo comparativo

    Directory of Open Access Journals (Sweden)

    Simone Maria Galvão Sousa

    2005-09-01

    Full Text Available The purpose of this study was to biochemically compare the decalcifying effects of 1% EDTA (pH 7.4, 1% EGTA (pH 7.4, 1% CDTA (pH 7.4, 1% citric acid solutions (pH 1.0 and 7.4 and saline solution (control on root dentin. Forty-eight single-rooted teeth were used in this study. The canals were instrumented by the step-back technique and the roots were randomly divided into six equal experimental groups (n = 8 according to the irrigating agent tested. A total of 30 µL of each solution was pipetted into the root canal and allowed to set undisturbed for 5 minutes. After this time, 15 µL of the solutions were removed from each canal using a Hamilton syringe and placed in a container with 5 mL of deionised water. The µg/mL concentration of calcium ion (Ca2+ extracted from the root canal samples was determined using inductively coupled plasma-atomic emission spectrometry (ICP-AES. Data were analysed by means of the Kruskal-Wallis and Mood's median tests. Citric acid solution at pH 1.0 removed more calcium than at pH 7.4 and than the other chelating solutions tested (p 0.05. These results indicate that citric acid at pH 1.0 is a good alternative as an irrigating solution to remove the smear layer and facilitate the biomechanical procedures.Este trabalho teve como objetivo comparar o efeito desmineralizante do EDTA (pH 7,4, EGTA (pH 7,4, CDTA (pH 7,4, ácido cítrico (pH 1,0 e 7,4 e da solução salina (controle sobre a dentina radicular. Todas as soluções teste foram preparadas na concentração de 1%. Quarenta e oito dentes unirradiculares recém-extraídos foram utilizados neste experimento. Após a instrumentação dos canais radiculares pela técnica "step-back", as raízes foram aleatoriamente divididas em 6 grupos experimentais (n = 8 de acordo com a solução teste utilizada na irrigação final. Em cada grupo, 30 µL da solução teste foram pipetados no interior de cada canal radicular e mantidos estáveis por 5 minutos. Decorrido esse per

  8. Alterações estruturais do sistema radicular de soja em resposta à disponibilidade de fósforo no solo

    Directory of Open Access Journals (Sweden)

    Teruel Dioger Alexandre

    2001-01-01

    Full Text Available Tendo em vista que os métodos estatísticos tradicionais de análise dos atributos métricos do sistema radicular são insatisfatórios no que diz respeito à identificação e interpretação de estratégias adotadas pela planta em adaptação ao ambiente edáfico, o objetivo do trabalho foi utilizar conceitos de topologia para analisar as alterações estruturais apresentadas pelo sistema radicular da soja (Glycine max L. Merr. cv. Williams 82 em resposta à disponibilidade de fósforo no solo. Plantas de soja foram cultivadas em recipientes de acrílico preto, em condições controladas de temperatura e fotoperíodo. Dois tratamentos foram estabelecidos, pela adição de solução nutritiva ao substrato dos recipientes: +P (15,5 mg L-1 P e -P (8,5 mg L-1 P. Utilizando-se delineamento experimental inteiramente casualizado, com parcelas subdivididas no tempo, três repetições foram amostradas aos 5, 10, 15, 20, 25 e 30 dias após a germinação. Para cada tratamento, idade de amostragem e repetição foram obtidos o comprimento da raiz principal (ordem 0, e os respectivos números e comprimentos médios das raízes laterais de ordens 1, 2 e 3, de acordo com a posição de origem na raiz principal. Índices topológicos foram definidos e aplicados para cada tratamento, utilizando-se os valores médios das três repetições. Os índices utilizados foram eficientes em detectar as alterações estruturais apresentadas pelos sistemas radiculares das plantas cultivadas sob menor teor de fósforo no solo.

  9. Multistate nested canalizing functions

    CERN Document Server

    Adeyeye, J O; Laubenbacher, R; Li, Y

    2013-01-01

    The concept of a nested canalizing Boolean function has been studied over the course of the last decade in the context of understanding the regulatory logic of molecular interaction networks, such as gene regulatory networks. Such functions appear preferentially in published models of such networks. Recently, this concept has been generalized to include multi-state functions, and a recursive formula has been derived for their number, as a function of the number of variables. This paper carries out a detailed analysis of the class of nested canalizing functions over an arbitrary finite field. Furthermore, the paper generalizes the concept further, and derives a closed formula for the number of such generalized functions. The paper also derives a closed formula for the number of equivalence classes under permutation of variables. This is motivated by the fact that two nested canalizing functions that differ by a permutation of the variables share many important properties with each other. The paper contributes ...

  10. Love canal questions

    Science.gov (United States)

    Bell, Peter M.

    The Environmental Protection Agency (EPA) conducted a 3-month monitoring study of the Love Canal area near Niagara Falls, N.Y., after the federal government pronounced that a potential health risk existed due to chemical waste dumps. In 1982 the Department of Health and Human Services (HHS) decided that the area was habitable, subject to implementation of effective safeguards against leakage from the canal and to cleaning up of the contaminants. Now, the Congressional Office of Technology Assessment (OTA) has announced that, with the information available, it is not possible to demonstrate with certainty that unsafe levels do not exist within the so-called “emergency declaration area” (EDA).

  11. Avaliação do metabolismo epitelial em cistos radiculares pela técnica de AgNORS

    Directory of Open Access Journals (Sweden)

    Daiana Cavalli

    Full Text Available Introdução: A formação do Cisto Radicular (CR está associada à proliferação dos restos epiteliais de Malassez por estímulos inflamatórios, provenientes da proliferação bacteriana do canal radicular de um dente não vital. Quando o dente é removido, esse cisto passa a ser denominado Cisto Residual (CRe. O tratamento de escolha para o CR é endodôntico, com o objetivo de eliminar a inflamação presente no periápice. No entanto, em alguns casos, o cisto pode continuar a crescer, necessitando de tratamento cirúrgico, o que ocorre na maioria dos casos de CRe. Objetivo: Avaliar o metabolismo do epitélio de revestimento de CR e CRe, utilizando a quantificação das AgNORs, e verificar a influência da presença de inflamação sobre o crescimento desses cistos. Material e método: Vinte casos de CR e dez de CRe foram submetidos à técnica de AgNOR. A análise quantitativa das NORs foi realizada utilizando-se o software 'Contando células'. O teste estatístico pós-hock de Newman-keuls foi realizado para a comparação do número médio de AgNORs entre CR e CRe, e entre áreas inflamadas e não inflamadas. Resultado: Diferença estatisticamente significante (p=0,0094 foi observada entre áreas inflamadas (1,86±0,26 e não inflamadas (1,65±0,20. Na comparação entre CR (1,81±0,28 e CRe (1,73±0,16, não houve diferença estatisticamente significante (p=0,37. Conclusão: A inflamação interfere no metabolismo epitelial de CR e CRe, o que reflete a ação de fatores de crescimento na proliferação do epitélio, contribuindo para o crescimento do cisto, independentemente da presença do fator etiológico associado com a origem da lesão.

  12. Nutrient canal of the fibula

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Joo-Hyuk; Ehara, Shigeru; Tamakawa, Yoshiharu [Departments of Radiology, Iwate Medical University School of Medicine, Morioka (Japan); Horiguchi, Masahura [Department of Anatomy I, Iwate Medical University School of Medicine, Morioka (Japan)

    2000-01-01

    Objective. To investigate the radiological features of the nutrient canal in the fibula.Design and patients. One hundred and seventy-nine dried fibulae were studied regarding the type, number, location, and direction of the nutrient canal. They were classified into a usual type (type I: a radiolucent line confined to the cortex) and an atypical type (type II: a radiolucent line extending beyond the cortex).Results. Among the total of 230 nutrient canals seen on radiography, 197 (86%) were type I and 33 (14%) were type II. On CT scans, the ossified rim of the canal extended into the medullary cavity in type II canals. The most common site was the posteromedial aspect in both type I and type II canals. Type II canals were significantly more common in fibulae with two or three nutrient canals. The frequency of the upward direction was more common in type II canals.Conclusion. Nutrient canals with extension of the ossified rim into the medullary canal are the cause of linear lucency that may simulate a fracture. Their features are slightly different from those of usual canals. (orig.)

  13. Crescimento inicial de Tabebuia aurea sob três intensidades luminosas

    Directory of Open Access Journals (Sweden)

    Ademir Kleber Morbeck de Oliveira

    2012-06-01

    Full Text Available http://dx.doi.org/10.5902/198050985733A espécie Tabebuia aurea é comumente encontrada no Pantanal de Miranda-MS, em formações vegetacionais conhecidos como paratudais. Essa espécie é boa melífera, fornece corante amarelo para tintura em comunidades rurais e também é considerada uma planta medicinal. Sua madeira tem valor econômico sendo utilizada na construção civil, entre outros usos, além de empregada na arborização e paisagismo. Levando-se em consideração seu amplo aproveitamento, seu desenvolvimento inicial foi analisado durante um período de 180 dias após a emergência, a pleno sol e sob sombreamento artificial (30 e 45% em Latossolo Vermelho-Amarelo com adição de cálcio e magnésio. Os resultados obtidos indicam que esta espécie se desenvolve melhor sob luminosidade máxima, atingindo 52,7 cm de altura e 43,2 g de matéria seca aos 180 dias de cultivo, com tendência contínua de concentração de matéria orgânica no sistema radicular, principalmente, a partir de 120 dias. Para todas as luminosidades nas quais a espécie foi cultivada, apresentou elevada plasticidade fenotípica para o índice de robustez e biomassa seca total, indicando adaptação aos ambientes de cultivo.

  14. Effectiveness of conservative treatments for the lumbosacral radicular syndrome: a systematic review.

    Science.gov (United States)

    Luijsterburg, Pim A J; Verhagen, Arianne P; Ostelo, Raymond W J G; van Os, Ton A G; Peul, Wilco C; Koes, Bart W

    2007-07-01

    Patients with a lumbosacral radicular syndrome are mostly treated conservatively first. The effect of the conservative treatments remains controversial. To assess the effectiveness of conservative treatments of the lumbosacral radicular syndrome (sciatica). Relevant electronic databases and the reference lists of articles up to May 2004 were searched. Randomised clinical trials of all types of conservative treatments for patients with the lumbosacral radicular syndrome selected by two reviewers. Two reviewers independently assessed the methodological quality and the clinical relevance. Because the trials were considered heterogeneous we decided not to perform a meta-analysis but to summarise the results using the rating system of levels of evidence. Thirty trials were included that evaluated injections, traction, physical therapy, bed rest, manipulation, medication, and acupuncture as treatment for the lumbosacral radicular syndrome. Because several trials indicated no evidence of an effect it is not recommended to use corticosteroid injections and traction as treatment option. Whether clinicians should prescribe physical therapy, bed rest, manipulation or medication could not be concluded from this review. At present there is no evidence that one type of treatment is clearly superior to others, including no treatment, for patients with a lumbosacral radicular syndrome.

  15. Curved canals: Ancestral files revisited

    Directory of Open Access Journals (Sweden)

    Jain Nidhi

    2008-01-01

    Full Text Available The aim of this article is to provide an insight into different techniques of cleaning and shaping of curved root canals with hand instruments. Although a plethora of root canal instruments like ProFile, ProTaper, LightSpeed ® etc dominate the current scenario, the inexpensive conventional root canal hand files such as K-files and flexible files can be used to get optimum results when handled meticulously. Special emphasis has been put on the modifications in biomechanical canal preparation in a variety of curved canal cases. This article compiles a series of clinical cases of root canals with curvatures in the middle and apical third and with S-shaped curvatures that were successfully completed by employing only conventional root canal hand instruments.

  16. Palatal radicular groove: Clinical implications of early diagnosis and surgical sealing

    Directory of Open Access Journals (Sweden)

    P Corrêa-Faria

    2011-01-01

    Full Text Available Palatal radicular groove is a discreet alteration in tooth morphology, characterized by an invagination that begins near the cingulum of the tooth and moves in an apical direction. Clinically, palatal radicular groove may be associated with periodontal and/or endodontic problems. This paper describes a clinical case of a young patient with palatal radicular groove with no signs of periodontal disease or endodontic impairment. An early diagnosis was made and treatment consisted of surgical sealing of the defect. After a 2-year period, reexaminations demonstrated adequate hygiene, maintenance of tooth vitality and periodontal health. The early diagnosis and sealing of the groove observed surgically made the root surface smooth, avoiding subgingival bacterial plaque buildup, and preventing possible periodontal and/or pulp impairment stemming from the defect.

  17. Sistema radicular de plantas cítricas e atributos físicos do solo em um Latossolo argiloso submetido à escarificação

    Directory of Open Access Journals (Sweden)

    Bordin Ivan

    2005-01-01

    Full Text Available O trabalho teve como objetivo avaliar a influência da escarificação sobre atributos físicos do solo e sobre a distribuição do sistema radicular do limão ?Cravo? (Citrus limonia Osb sob copa de laranja ?Pêra? (Citrus sinensis L. Osb. Foram abertas quatro trincheiras para cada tratamento (entrelinha escarificada e entrelinha não escarificada avaliando-se distribuição das raízes na linha e entrelinha até a profundidade de 1,0 m pelo Sistema Integrado de Análise de Raízes e Cobertura do Solo (SIARCS 3.0. A porosidade total e a densidade do solo foram avaliadas em três profundidades (0,000-0,125; 0,125-0,250 e 0,25-0,375 m em três posições: linha, centro da entrelinha e limite da copa na entrelinha. Três anos depois da escarificação não se detectou alteração para a densidade e a porosidade total do solo nas entrelinhas do pomar e a quantidade de raízes, independentemente da profundidade e posição em relação à planta.

  18. Managing curved canals

    Directory of Open Access Journals (Sweden)

    Iram Ansari

    2012-01-01

    Full Text Available Dilaceration is the result of a developmental anomaly in which there has been an abrupt change in the axial inclination between the crown and the root of a tooth. Dilaceration can be seen in both the permanent and deciduous dentitions, and is more commonly found in posterior teeth and in maxilla. Periapical radiographs are the most appropriate way to diagnose the presence of root dilacerations. The controlled regularly tapered preparation of the curved canals is the ultimate challenge in endodontics. Careful and meticulous technique will yield a safe and sufficient enlargement of the curved canals. This article gives a review of the literature and three interesting case reports of root dilacerations.

  19. Self-etching adhesives increase collagenolytic activity in radicular dentin.

    Science.gov (United States)

    Tay, Franklin R; Pashley, David H; Loushine, Robert J; Weller, R Norman; Monticelli, Francesca; Osorio, Raquel

    2006-09-01

    Endogenous matrix metalloproteinases (MMPs) release from crown dentin and their activation results in degradation of hybrid layers created by dentin adhesives. This study tested the hypothesis that instrumented intraradicular dentin possesses latent collagenolytic activity that is activated by mild self-etching adhesives. Root dentin shavings were produced from 50 cleaned and shaped, saline-irrigated root canals using Gates Glidden drills and rinsed with sodium azide to prevent bacterial growth. Dried dentin powder aliquots were treated with two clinically-relevant MMP inhibitors, 2% chlorhexidine for 10 minutes and 17% EDTA for 1 minute. Additional dentin powder was mixed with Clearfil Liner Bond 2V or Clearfil Tri-S Bond for 1 minute followed by extracting the adhesives with acetone. Dentin powder was also treated with 2% chlorhexidine for 10 minutes before or after adhesive application. Collagenolytic activities of the nine groups were assayed with a fluorometer in 96-well plates, by recording the changes in fluorescence before and after addition of fluorescein-labeled type I collagen. Epoxy resin-embedded powders were examined with TEM for the extent of demineralization. Instrumented, mineralized intraradicular dentin possessed low but detectable collagenolytic activity that was inhibited by chlorhexidine (p dentin powder and activated latent MMPs, with 14- to 15-fold increases in collagenolytic activities (p MMPs without denaturing these enzymes, and may adversely affect the longevity of bonded root canal fillings and posts.

  20. Sistemas adesivos em cemento e dentina radicular: revisão bibliográfica

    OpenAIRE

    Silva, Ana Rita Cortes Alçada Oliveira da

    2013-01-01

    Tese de mestrado, Medicina dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2013 O envelhecimento da população tem despertado novas preocupações na Dentisteria Restauradora devido ao aumento da prevalência de diferentes doenças, como as cáries radiculares. Os compósitos assumem-se como o material de eleição neste tipo de lesões, pelo que se torna necessário conhecer o desempenho dos sistemas adesivos sobre os tecidos radiculares. Assim, o objetivo deste trabalho é a realiz...

  1. Canal Wall Reconstruction Mastoidectomy

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Objective To investigate the advantages of canal wall reconstruction (CWR) mastoidectomy, a single-stage technique for cholesteatoma removal and posterior external canal wall reconstruction, over the open and closed procedures in terms of cholesteatoma recurrence. Methods: Between June 2002 and December 2005, 38 patients (40 ears) with cholesteatoma were admited to Sun Yat-Sen Memorial Hospital and received surgical treatments. Of these patients, 25 were male with ages ranging between 11 and 60 years (mean = 31.6 years) and 13 were female with ages ranging between 20 and 65 years (mean = 38.8 years). Canal wall reconstruction (CWR)mastoidectomy was performed in 31 ears and canal wall down (CWD) mastoidectomy in 9 ears. Concha cartilage was used for ear canal wall reconstruction in 22 of the 31 CWR procedures and cortical mastoid bone was used in the remaining 9 cases. Results At 0.5 to 4 years follow up, all but one patients remained free of signs of cholesteatoma recurrence, i.e., no retraction pocket or cholesteatoma matrix. One patient, a smoker, needed revision surgery due to cholesteatoma recurrence 1.5 year after the initial operation. The recurrence rate was therefore 3.2% (1/31). Cholesteatoma recurrence was monitored using postoperative CT scans whenever possible. In the case that needed a revision procedure, a retraction pocket was identified by otoendoscopy in the pars flacida area that eventually evolved into a cholesteatoma. A pocket extending to the epitympanum filled with cholesteatoma matrix was confirmed during the revision operation, A decision to perform a modified mastoidectomy was made as the patient refused to quit smoking. The mean air-bone gap in pure tone threshold was 45 dB before surgery and 25 dB after (p < 0.05). There was no difference between using concha cartilage and cortical mastoid bone for the reconstruction regarding air-bone gap improvement, CT findings and otoendoscopic results. Conclusion CWR mastoidectomy can be used for

  2. Analysis of sedimentation of canals

    Directory of Open Access Journals (Sweden)

    Agunwamba, J.C.,

    2013-03-01

    Full Text Available The dredged canals in the Niger Delta coastal flood plain are being threatened by siltation. This study is limited to those canals in Rivers State of Nigeria, which are under the influence of tidal waves. A total of eight canals were considered with four each from Ekulama and Cawthorne Channel. Different approaches were used to carry out this study, which includes field reconnaissance survey, hydrographic survey, soil sample analysis and collection of all available data and information. The typical bed materials size (D50 is approximately 0.01mm; which gives a settling velocity of 0.09mm/sec using stroke’s law. Hydrographic survey of the canals from 1992 to 1996 revealed an average siltation rate of 2.35m/yr. A regression equation was also derived which relates the cost of dredging to canal area, rate of siltation and average aggregation. A plot of canal centre profile; entrance, middle and end cross sections showing sediment distribution along the canal profile, shows that majority of the particles that form the sediment enter the canal from the rivers. The sedimentation is caused by the reduction in water current, which has average value of 0.0145m/sec. The bathyorographical check on the canals revealed that the sum of the two exterior angles of the canal with the river at the point of connection has to lie within 1800 + 50 for an effective flow that will minimize settlement of particles. In addition, the canals should be constructed to start and terminate on a moving water body, to avoid dead ends. A regression equation was determined which relates the cost of dredging to canal area, rate of siltation and average aggradations.

  3. Controversy at Love Canal.

    Science.gov (United States)

    Paigen, B

    1982-06-01

    A cancer researcher reviews the events surrounding the toxic waste contamination at Love Canal with emphasis on the political nature of the controversy about its health impact. Antagonism between the community and the New York State Department of Health was fueled by several factors: the state's awareness that it gained from delay in investigation, disagreement on health problems to be studied, control over the information gathering process, silencing of opposition opinion, and the violation of norms of scientific behavior. The author calls for the establishment of standards of ethical behavior for scientists in such situations, standards for conflict resolution, and means of appeal for those injured.

  4. Morphology of bacterial flora in root canals associated with apical abscesses

    Institute of Scientific and Technical Information of China (English)

    Guo Huijie; Gao Chengzhi; Zhang Chengfei; Zheng Shuying; Yue Lin

    2014-01-01

    Background Apical abscess is an inflammatory process in the peri-radicular tissues caused by biofllms in the necrotic root canal systems.Therefore,a comprehensive analysis of the bacterial colonization is required for a better understanding of the pathogenesis.This study aimed to investigate the patterns of bacterial infection of root canals of teeth with apical abscesses and to determine whether histological and microbiological findings correlated with clinical conditions.Methods Eighteen samples from 18 teeth with apical pathological lesions were analyzed.Nine patients with acute apical abscesses experienced severe pain,and nine patients were asymptomatic with a sinus tract.After extraction,each affected root was divided into two halves.One half was processed for histobacteriologic analysis and examined using light microscopy,and the other half was analyzed using scanning electron microscopy (SEM) to determine the patterns of microbial colonization of the root canals.Results The appearance of each sample subjected to SEM was consistent with the histobacteriologic findings despite the presence or absence of clinical symptoms.Intraradicular biofilms comprising cocci,rods,and/or filaments of amorphous materials were observed in the apical third of the main root canals in all samples.The bacterial biofilms covering the main root canal walls also penetrated the dentinal tubules to varying depths.The morphologies of biofilms varied,and a unique pattern of intraradicular infection was not identified.Conclusion Intraradicular infections formed complex and variable multispecies biofilms and their presence did not correlate with clinical symptoms.

  5. Disc-like herniation in association with gas collection in the spinal canal: CT evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Tsitouridis, Ioannis [Radiology Department, Papageorgiou General Hospital, Peripheral Rd., Nea Efkarpia, 546 29 Thessaloniki (Greece)]. E-mail: hanjk@radcom.snu.ac.kr; Sayegh, Fares E. [3rd Orthopaedic Department, Aristotle University of Thessaloniki (Greece); Papapostolou, Panagiota [Radiology Department, Papageorgiou General Hospital, Peripheral Rd., Nea Efkarpia, 546 29 Thessaloniki (Greece); Chondromatidou, Stella [Radiology Department, Papageorgiou General Hospital, Peripheral Rd., Nea Efkarpia, 546 29 Thessaloniki (Greece); Goutsaridou, Fotini [Radiology Department, Papageorgiou General Hospital, Peripheral Rd., Nea Efkarpia, 546 29 Thessaloniki (Greece); Emmanouilidou, Maria [Radiology Department, Papageorgiou General Hospital, Peripheral Rd., Nea Efkarpia, 546 29 Thessaloniki (Greece); Sidiropoulou, Maria S. [Radiology Department, Papageorgiou General Hospital, Peripheral Rd., Nea Efkarpia, 546 29 Thessaloniki (Greece); Kapetanos, George A. [3rd Orthopaedic Department, Aristotle University of Thessaloniki (Greece)

    2005-10-01

    Gas production as a part of disk degeneration can occur but rarely causes nerve compression syndromes. Few cases have been reported in which lumbar intraspinal epidural gas cause nerve root compression symptoms. We present 12 cases of gas collection in the spinal canal that were presented to the orthopaedic out-patient department with symptoms of low back pain and sciatica. CT showed the presence of free epidural gas collections adjacent to or over the affected nerve roots. Relief of symptoms was noted with the change of positions, lying down or sleeping. In this study, we conclude that the presence of lumbar intraspinal epidural gas that causes radicular compressing phenomena, can be easily detected with the use of CT.

  6. Conservative treatment in patients with an acute lumbosacral radicular syndrome: design of a randomised clinical trial [ISRCTN68857256].

    NARCIS (Netherlands)

    P.A.J. Luijsterburg (Pim); A.P. Verhagen (Arianne); R.W.J.G. Ostelo (Raymond); H.J. van den Hoogen (Hans); W.C. Peul (Wilco); C.J.J. Avezaat (Cees); B.W. Koes (Bart)

    2004-01-01

    textabstractBACKGROUND: The objective is to present the design of randomised clinical trial (RCT) on the effectiveness of physical therapy added to general practitioners management compared to general practitioners management only in patients with an acute lumbosacral radicular syn

  7. Successful treatment of a radicular groove by intentional replantation and Emdogain therapy: four years follow-up.

    Science.gov (United States)

    Al-Hezaimi, Khalid; Naghshbandi, Jafar; Simon, James H S; Rotstein, Ilan

    2009-03-01

    Radicular groove is an anatomical malformation that often causes severe periodontal defects. Treatments of such an anomaly present a clinical challenge to the operator. Presented is a case of successful treatment of radicular groove associated with a maxillary lateral incisor of a 15-year-old girl. A combination of endodontics, intentional replantation, and Emdogain therapy was used. At 4-year follow-up, the patient was comfortable and complete resolution of the periapical pathology was evident.

  8. Hood Canal Steelhead - Hood Canal Steelhead Supplementation Experiment

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Hood Canal Steelhead Project is a 17-year before-after-control-impact experiment that tests the effects of supplementation on natural steelhead populations in...

  9. Radicular dysfunction preponderance at early phase clinical evaluation in myelitis by Schistosoma mansoni

    Directory of Open Access Journals (Sweden)

    Claudio Henrique Fernandes Vidal

    2011-04-01

    Full Text Available In neuroschistosomiasis, the spinal cord is the most common place of the disease. In high prevalent areas for schistosomiasis mansoni, the clinical alertness is important for an early diagnostic, in order to decrease the final neurological damage. This study provides some useful neurologic information about a series of patients with schistosomal myelitis. METHOD: The sample consisted of 13 schistosomiasis mansoni carriers examined at the moment of the diagnosis of myelitis. RESULTS: The classical triad (lumbago, weakness at the lower limbs and urinary dysfunctions was documented in 11 (86.61% patients. The distribution of the clinical forms was: myeloradicular in six patients (46.15%, radicular in four (30.76% and myelitic in three (23.07%. CONCLUSION: The radicular dysfunction and their clinical associated forms were the most prominent pattern during the early phase of this disease.

  10. Effects of distance from the pulp and thickness on the hydraulic conductance of human radicular dentin.

    Science.gov (United States)

    Fogel, H M; Marshall, F J; Pashley, D H

    1988-11-01

    The purposes of this study were: (1) to measure the effect of distance from the pulp on the hydraulic conductance of human radicular dentin; (2) to determine the influence of dentin thickness on the rates of fluid flow; and (3) to attempt to correlate dentinal tubule densities and diameters with root dentin hydraulic conductance. Dentin slabs prepared from extracted, unerupted, human third molar teeth were placed in a split-chamber device to permit quantitation of fluid filtration rate (hydraulic conductance). In the SEM portion of the study, dentinal tubule numbers and diameters were recorded. The results indicated that radicular dentin hydraulic conductance decreased with distance from the pulp and with increasing dentin thickness. Tubule density and diameter correlated well with the measured hydraulic conductances. The relatively low hydraulic conductance of outer root dentin makes it a significant barrier to fluid movement across root structure.

  11. Depolarization canals and interstellar turbulence

    CERN Document Server

    Fletcher, A; Fletcher, Andrew; Shukurov, Anvar

    2006-01-01

    Recent radio polarization observations have revealed a plethora of unexpected features in the polarized Galactic radio background that arise from propagation effects in the random (turbulent) interstellar medium. The canals are especially striking among them, a random network of very dark, narrow regions clearly visible in many directions against a bright polarized Galactic synchrotron background. There are no obvious physical structures in the ISM that may have caused the canals, and so they have been called Faraday ghosts. They evidently carry information about interstellar turbulence but only now is it becoming clear how this information can be extracted. Two theories for the origin of the canals have been proposed; both attribute the canals to Faraday rotation, but one invokes strong gradients in Faraday rotation in the sky plane (specifically, in a foreground Faraday screen) and the other only relies on line-of-sight effects (differential Faraday rotation). In this review we discuss the physical nature o...

  12. The Love Canal: Beyond science?

    Science.gov (United States)

    Bell, Peter M.

    When in 1978, the New York State Department of Health issued the report, ‘Love Canal—Public Health Time Bomb,’ the serious effects of chemical waste contamination in the Love Canal area became an issue of national concern. A few ‘studies’ since then have produced results in concert with those of initial reports that described ‘conditions of acute health effects’ as being linked to hazardous wastes incorporated in landfill in the Love Canal site near Niagara Falls, New York. Now that a ‘blue ribbon’ panel of experts from the medical sciences has reviewed the problems of Love Canal, however, a different view has emerged. The ‘Report of the Governors' Panel to Review Scientific Studies and the Development of Public Policy on Problems Resulting from Hazardous Wastes,’ transmitted in October of this year, identifies the following factors about the health effects at Love Canal:

  13. Horizontal Canal Benign Positional Vertigo

    Directory of Open Access Journals (Sweden)

    Mohtaram Najafi

    1998-03-01

    Full Text Available Benign paroxysmal positional vertigo (BPPV is a syndrome characterized by transient episodes of vertigo in association with rapid changes in head position in Dix-Halpike Maneuver. This kind of vertigo is thought to be caused by migration of otoconial debris into canals other than the posterior canal, such as the anterior or lateral canals. It is also theoretically possible for many aberrant patterns of BPPV to occur from an interaction of debris in several canals, location of debris within the canal, and central adaptation patterns to lesions. The symptoms of BPPV are much more consistent with free-moving densities (canaliths in the posterior SCC rather than fixed densities attached to the cupula. While the head is upright, the particles sit in the PSC at the most gravity-dependent position. The best method to induce and see vertigo and nystagmus in BPPV of the lateral semicircular canal is to rotate head 90°while patient is in the supine position, nystagmus would appear in the unaffected side weaker but longer than the affected side. canal paresis has been described in one third of the patients with BPPV. Adaptation which is one of the remarkable features of BPPV in PSC is rarely seen in LSC. Rotations of 270° or 360° around the yaw axis (the so-called barbecue maneuver toward the unaffected ear are popular methods for the treatment of geotropic HC-BPPV. These maneuvers consist of sequential head turning of 90° toward the healthy side while supine. With these maneuvers, the free-floating otoconial debris migrates in the ampullofugal direction, finally entering the utricle through the nonampullated end of the horizontal canal. This kind of vertigo recovers spontaneously more rapidly and suddenly.

  14. Replantation of Displaced Underlying Successor and Marsupialization of Radicular Cyst associated with a Primary Molar

    Science.gov (United States)

    Ravi, GR

    2015-01-01

    ABSTRACT Radicular cysts are by far the most common cystic lesions of the jaw. However, those arising from primary teeth are comparatively rare, comprising only 0.5 to 3.3%. The aim of this paper is to present clinical, radiographic and histopathological characteristics of radicular cyst associated with a primary mandibular molar causing unusual displacement of the permanent successor. Extraction of primary tooth along with extirpation of cyst was done under local anesthesia. The displaced premolar was also extracted and then replanted in the socket after proper alignment. Healing was uneventful and the space of missing primary molar was maintained by band and loop space maintainer. The relationship between intracanal medicaments and rapid growth of cyst, as mentioned in literature was observed in our case too. Thus, pulpotomy treated primary teeth should receive periodic postoperative radiographic examination and absence of clinical symptoms does not mean that a pulpotomy treated tooth is healthy. How to cite this article: Lamba G, Ravi GR. Replantation of Displaced Underlying Successor and Marsupialization of Radicular Cyst associated with a Primary Molar. Int J Clin Pediatr Dent 2015;8(1):70-74. PMID:26124586

  15. Quantitative analysis of the epithelial lining architecture in radicular cysts and odontogenic keratocysts

    Directory of Open Access Journals (Sweden)

    Landini Gabriel

    2006-02-01

    Full Text Available Abstract Background This paper describes a quantitative analysis of the cyst lining architecture in radicular cysts (of inflammatory aetiology and odontogenic keratocysts (thought to be developmental or neoplastic including its 2 counterparts: solitary and associated with the Basal Cell Naevus Syndrome (BCNS. Methods Epithelial linings from 150 images (from 9 radicular cysts, 13 solitary keratocysts and 8 BCNS keratocysts were segmented into theoretical cells using a semi-automated partition based on the intensity of the haematoxylin stain which defined exclusive areas relative to each detected nucleus. Various morphometrical parameters were extracted from these "cells" and epithelial layer membership was computed using a systematic clustering routine. Results Statistically significant differences were observed across the 3 cyst types both at the morphological and architectural levels of the lining. Case-wise discrimination between radicular cysts and keratocyst was highly accurate (with an error of just 3.3%. However, the odontogenic keratocyst subtypes could not be reliably separated into the original classes, achieving discrimination rates slightly above random allocations (60%. Conclusion The methodology presented is able to provide new measures of epithelial architecture and may help to characterise and compare tissue spatial organisation as well as provide useful procedures for automating certain aspects of histopathological diagnosis.

  16. Replantation of Displaced Underlying Successor and Marsupialization of Radicular Cyst associated with a Primary Molar.

    Science.gov (United States)

    Lamba, Gagandeep; Ravi, G R

    2015-01-01

    Radicular cysts are by far the most common cystic lesions of the jaw. However, those arising from primary teeth are comparatively rare, comprising only 0.5 to 3.3%. The aim of this paper is to present clinical, radiographic and histopathological characteristics of radicular cyst associated with a primary mandibular molar causing unusual displacement of the permanent successor. Extraction of primary tooth along with extirpation of cyst was done under local anesthesia. The displaced premolar was also extracted and then replanted in the socket after proper alignment. Healing was uneventful and the space of missing primary molar was maintained by band and loop space maintainer. The relationship between intracanal medicaments and rapid growth of cyst, as mentioned in literature was observed in our case too. Thus, pulpotomy treated primary teeth should receive periodic postoperative radiographic examination and absence of clinical symptoms does not mean that a pulpotomy treated tooth is healthy. How to cite this article: Lamba G, Ravi GR. Replantation of Displaced Underlying Successor and Marsupialization of Radicular Cyst associated with a Primary Molar. Int J Clin Pediatr Dent 2015;8(1):70-74.

  17. Effect of phytic acid, ethylenediaminetetraacetic acid, and chitosan solutions on microhardness of the human radicular dentin

    Directory of Open Access Journals (Sweden)

    Vineeta Nikhil

    2016-01-01

    Full Text Available Aim: The purpose of this study was to evaluate the effect of phytic acid, ethylenediaminetetraacetic acid (EDTA, and chitosan solutions on the microhardness of human radicular dentin. Materials and Methods: Thirty dentin specimens were randomly divided into three groups of 10 specimens each according to the irrigant used: G1 - 1% phytic acid, G2 - 17% EDTA, and G3 - 0.2% chitosan. A standardized volume of each chelating solution was used for 3 min. Dentin microhardness was measured before and after application at the cervical, middle, and apical levels with a Vickers indenter under a 200-g load and a 10-s dwell time. The results were analyzed using one-way analysis of variance (ANOVA and Student′s t test. Results: Microhardness of the radicular dentin varied at the cervical, middle, and apical levels. EDTA had the greatest overall effect, causing a sharp percentage reduction in dentin microhardness with a significant difference from phytic acid and chitosan (P = 0.002. However, phytic acid and chitosan differed insignificantly from each other (P = 0.887. Conclusion: All tested chelating solutions reduced microhardness of the radicular dentin layer at all the levels. However, reduction was least at the apical level. EDTA caused more reduction in dentin microhardness than chitosan while phytic acid reduced the least.

  18. Estudio de la variación de la permeabilidad de la dentina radicular usando isótopos 99mTc, después de la aplicación de láser de alta intensidad Study of the dentin root permeability variation using 99mTc isotopes, after the application of high intensity laser

    Directory of Open Access Journals (Sweden)

    R. Cabrales Salgado

    2012-02-01

    Full Text Available Objetivo: Este estudio tuvo como objetivo evaluar las variaciones de la permeabilidad dentinaria radicular de dientes humanos después del preparo químico-quirúrgico e irradiación con láser de Er: YAG, Nd: YAG, a través de la utilización del radioisótopo tecnecio-99m (99mTc libre. Materiales y métodos: Canales de treinta raíces palatinas de primeros premolares superiores humanos fueron preparados y divididos, aleatoriamente, en 3 grupos experimentales: G1 (control, G2 (irradiación con láser de Er: YAG y G3 (irradiación con láser de Nd: YAG. Las muestras recibieron en el interior del canal radicular, 99mTc libre en cantidad suficiente para el llenado y colocados en tubos de ensayo contiendo 1 ml de solución salina. Después de 1 hora, la cuenta del isótopo radioactivo (99mTc fue realizada. Resultados: Después del análisis estadístico (ANOVA, fue verificado que los mejores resultados obtenidos en cuanto a la disminución de la permeabilidad se encontraron en el Grupo 3, seguido del Grupo 2 y del Grupo 1. Conclusión: Concluimos que irradiación con láser de Nd: YAG provocó una disminución significativa de la permeabilidad dentinaria del canal radicular. El láser de Er: YAG y el control en relación a la permeabilidad de la dentina de las paredes del canal radicular no presentaron diferencias estadísticamente significativas a nivel de 5%.Objective: The objective of this study was to evaluate changes in root dentin permeability of human teeth after chemical-surgical preparation, and laser irradiation with Er: YAG, Nd: YAG, through the use of the radioisotope technetium-99m (99mTc free. Materials and methods: thirty Channels palatal roots of human maxillary first premolars were prepared and divided randomly into three experimental groups: G1 (control, G2 (laser irradiation with Er: YAG and G3 (Nd laser irradiation : YAG. in the samples were deposited 99mTc free inside the root canal, enough to fill and placed in test tubes

  19. MANAGEMENT OF LUMBAR SPINAL CANAL STENOSIS

    Directory of Open Access Journals (Sweden)

    Mukhergee G. S

    2016-06-01

    . Appeared to reach a maximum at 6 months, and persisted for 18 months. The condition of patients in the non-surgical group improved only moderately during the 18-month period. Results in both groups were stable during every follow-up throughout the period of study i.e. from 6 weeks to 18 months. No catastrophic events arose among the patients receiving conservative treatment. De compressive surgery (Laminectomy is more effective than conservative treatment for radicular pain due to lumbar spinal canal stenosis. The functional effectiveness of surgery for pain and disability was sustained and more on comparison with conservative treatment. Those treated surgically showed significantly greater improvement in terms of function and self-rated progress over 18 months compared to patients treated nonoperatively in terms of ODI index, SF 36 BP, SF 36 PF scores.

  20. Limitations of navigation through Nubaria canal, Egypt.

    Science.gov (United States)

    Samuel, Magdy G

    2014-03-01

    Alexandria port is the main Egyptian port at the Mediterranean Sea. It is connected to the Nile River through Nubaria canal, which is a main irrigation canal. The canal was designed to irrigate eight hundred thousand acres of agricultural lands, along its course which extends 100 km. The canal has three barrages and four locks to control the flow and allow light navigation by some small barges. Recently, it was decided to improve the locks located on the canal. More than 40 million US$ was invested in these projects. This decision was taken to allow larger barges and increase the transported capacity through the canal. On the other hand, navigation through canals and restricted shallow waterways is affected by several parameters related to both the channel and the vessel. Navigation lane width as well as vessel speed and maneuverability are affected by both the channel and vessel dimensions. Moreover, vessel dimensions and speed will affect the canal stability. In Egypt, there are no guide rules for navigation through narrow and shallow canals such Nubaria. This situation threatens the canal stability and safety of navigation through it. This paper discussed the characteristics of Nubaria canal and the guide rules for navigation in shallow restricted water ways. Dimensions limitation for barges navigating through Nubaria canal is presented. New safe operation rules for navigation in Nubaria canal are also presented. Moreover, the implication of navigation through locks on canal discharge is estimated.

  1. Limitations of navigation through Nubaria canal, Egypt

    Directory of Open Access Journals (Sweden)

    Magdy G. Samuel

    2014-03-01

    Full Text Available Alexandria port is the main Egyptian port at the Mediterranean Sea. It is connected to the Nile River through Nubaria canal, which is a main irrigation canal. The canal was designed to irrigate eight hundred thousand acres of agricultural lands, along its course which extends 100 km. The canal has three barrages and four locks to control the flow and allow light navigation by some small barges. Recently, it was decided to improve the locks located on the canal. More than 40 million US$ was invested in these projects. This decision was taken to allow larger barges and increase the transported capacity through the canal. On the other hand, navigation through canals and restricted shallow waterways is affected by several parameters related to both the channel and the vessel. Navigation lane width as well as vessel speed and maneuverability are affected by both the channel and vessel dimensions. Moreover, vessel dimensions and speed will affect the canal stability. In Egypt, there are no guide rules for navigation through narrow and shallow canals such Nubaria. This situation threatens the canal stability and safety of navigation through it. This paper discussed the characteristics of Nubaria canal and the guide rules for navigation in shallow restricted water ways. Dimensions limitation for barges navigating through Nubaria canal is presented. New safe operation rules for navigation in Nubaria canal are also presented. Moreover, the implication of navigation through locks on canal discharge is estimated.

  2. El Canal del Atazar I

    Directory of Open Access Journals (Sweden)

    López de Berges y de los Santos, Emilio

    1967-03-01

    Full Text Available The Atazar Canal helps to supply Madrid with water, from the rivers Lozoya, Jarama and Sorbe. The section which operates at present starts at the Torrelaguna dam and finishes at the El Goloso reservoir. Later a further section will be added, from the Atazar dam, on the Lozoya river, to link up with the control dam at Torrelaguna. The canal capacity is 16 m3/sec, and it is 43.47 km long. It has a slope of 4/10.000. The cross section is similar to that of the Jarama canal, already built. There are interconnections between this canal and the Canal Alto, which previously supplied the high and medium part of Madrid. To overcome the ground unevenness 5 syphons have been built, the most important of which is the Colmenar Goloso syphon, which is 10.88 km in length. Construction commenced on December 10, 1962, and water reached Madrid on June 15th, 1966. The initial budget for this project was 1,500 million pesetas.El canal del Atazar refuerza considerablemente el abastecimiento de aguas a Madrid, procedentes de los ríos Lozoya, Jarama y, en un próximo futuro, del Sorbe. El tramo, actualmente en funcionamiento, empieza en el salto de Torrelaguna y finaliza en los depósitos de El Goloso. Más adelante se completará su trazado mediante un nuevo tramo que partirá del embalse de Atazar, en el Lozoya, para unirse al actual en el depósito regulador de Torrelaguna. Su capacidad es de 16 m3/s; su longitud, 43,471 km, y su pendiente, 4 diezmilésimas. La sección tipo es análoga a la del canal del Jarama, de construcción anterior. Mediante la oportuna obra de transvase se realizan intercambios entre este Canal y el Canal Alto que abastecía anteriormente la parte media y alta de la capital. Para salvar los desniveles del terreno se han construido 5 sifones, siendo el más importante el de Colmenar-Goloso, con una longitud de 10,8S4 km. El comienzo de las obras tuvo lugar el 10 de diciembre de 1962, y el agua llegó a Madrid el 15 de junio de 1966. Su

  3. Marketing města Soběslavi

    OpenAIRE

    NOVÁKOVÁ, Michaela

    2012-01-01

    The diploma thesis analysis marketing of the town Soběslav. The main goal is to analyze perception of tourism and tourism offer in the town Soběslav from the point of view of residents, surroundings and transitors. Minor goal is to create a project to support cultural and tourism offer in the town Soběslav. The first part of the diploma is dedicated to the marketing analysis of the town. In the second part of diploma is conducted research, the results of which are used for creation of the pro...

  4. Canals - CANALS_HISTORIC_STRUCTURES_IN: Historic Canal Structures in Indiana (Bernardin-Lochmueller & Associates, Point Shapefile)

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — Data depicts the locations of historic structures associated with the Wabash-Erie, Central, and Whitewater Canals constructed in Indiana in from 1830-1870. Canal...

  5. Corinth Canal, Greece

    Science.gov (United States)

    2006-01-01

    The Isthmus of Corinth has played a very important role in the history of Greece. It is the only land bridge between the country's north (Attica) and south (Peloponnese). It is a 6 km wide tongue of land separating the Gulf of Corinth from the Saronic Sea. Populations, armies and commodities have got to move through it. In the 6th century BCE, the Greeks built the Diolkos, a 10 meter-wide stone roadway to pull ships across the Isthmus on wooden cylinders and wheeled vehicles. In 1882, a canal was started and completed 11 years later. It is 6343 meters long, 25 meters wide, and 8 meters deep. With its 14 spectral bands from the visible to the thermal infrared wavelength region, and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), ASTER images Earth to map and monitor the changing surface of our planet. ASTER is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products. The broad spectral coverage and high spectral resolution of ASTER provides scientists in numerous disciplines with critical information for surface mapping, and monitoring of dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance. The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate. Size: 25.3 by 37.7 kilometers (15.7 by 23.4 miles) Location: 37.9 degrees North latitude, 23 degrees East longitude Orientation: North at top Image

  6. Fluidmechanics of semicircular canals revisited

    Science.gov (United States)

    Obrist, Dominik

    2008-05-01

    In this work we find the exact solution for the flow field in a semicircular canal which is the main sensor for angular motion in the human body. When the head is rotated the inertia of the fluid in the semicircular canal leads to a deflection of sensory hair cells which are part of a gelatinous structure called cupula. A modal expansion of the governing equation shows that the semicircular organ can be understood as a dynamic system governed by duct modes and a single cupular mode. We use this result to derive an explicit expression for the displacement of the cupula as a function of the angular motion of the head. This result shows in a mathematically and physically clean way that the semicircular canal is a transducer for angular velocity.

  7. Retention of Root Canal Posts

    DEFF Research Database (Denmark)

    Sahafi, A; Benetti, Ana Raquel; Flury, S;

    2015-01-01

    The aim of this study was to investigate the effect of the cement film thickness of a zinc phosphate or a resin cement on retention of untreated and pretreated root canal posts. Prefabricated zirconia posts (CosmoPost: 1.4 mm) and two types of luting cements (a zinc phosphate cement [DeTrey Zinc......] and a self-etch adhesive resin cement [Panavia F2.0]) were used. After removal of the crowns of 360 extracted premolars, canines, or incisors, the root canals were prepared with a parallel-sided drill system to three different final diameters. Half the posts did not receive any pretreatment. The other half...... received tribochemical silicate coating according to the manufacturer's instructions. Posts were then luted in the prepared root canals (n=30 per group). Following water storage at 37°C for seven days, retention of the posts was determined by the pull-out method. Irrespective of the luting cement...

  8. INSTRUMENTATION OF CURVED CANALS: A REVIEW

    Directory of Open Access Journals (Sweden)

    Senthil Kumar

    2013-02-01

    Full Text Available INTRODUCTION: Nature seldom draws a straight line. Nowhere is thi s more apparent than in the anatomy of teeth roots and root canal systems o f human teeth. Even teeth with straight roots can harbor severely curved canals. Canal shapi ng is a critical aspect of endodontic treatment because it influences the outcome of the subsequent phases of canal irrigation and filling and the success of the treatment itself. In fact, curved canals are the most common endodontic complexity 1 . The need for some manner of root canal preparation pri or to root canal filling has long been recognized as an essential step in endodontic t reatment. Concepts concerning the role and purpose of this canal preparation, however, have differ ed remarkably at different times in the development of endodontics and in the hands of diffe rent practitioners 2

  9. Fractura patológica de la mandíbula asociada a quiste radicular: Reporte de 3 casos clínicos Mandibular pathologic fracture associated with radicular cyst: Report of three clinical cases

    OpenAIRE

    Bouguila, J.; L. Córdova Jara; I. Zairi; A. Adouani

    2008-01-01

    Introducción. El quiste radicular es el quiste más común de los maxilares. Su tamaño puede variar desde una lesión que abarca el proceso alveolar hasta uno extenso que oblitera el espacio antral maxilar o causa una fractura patológica mandibular. Reporte de casos. Se reportan tres casos con fractura patológica mandibular asociados a quiste radicular ocurridos después de trauma facial. El diagnóstico fue sugerido por un estudio clínico, radiografía panorámica y confirmado por el estudio histop...

  10. COMPARACION DE LA REABSORCION RADICULAR EN DIENTES VITALES Y DIENTES CON ENDODONCIA A LOS 12 MESES DE TRATAMIENTO ORTODONCICO. MEDIANTE LA MEDICION DE LA LONGITUD RADICULAR. CLINICA DE ORTODONCIA DE LA U.M.S.N.H MORELIA MICH 2007.

    OpenAIRE

    Melendez Rodriguez, Verenice

    2012-01-01

    Han sido mucho las investigaciones clínicas que han demostrado la asociación entre reabsorción radicular y movimiento dentario ortodoncico. Desde que Schwarzkopf, en 1887, y Ottolengi, en 1914, observaron la aparición de acortamiento radicular tras el tratamiento. Hasta nuestros días, han sido múltiples los estudios que han tratado de relacionar en términos matemáticos la extensión del fenómeno con factores biológicos. Ketcham, en 1927, encontró reabsorción en el 22% de un g...

  11. Endoscopic-assisted Enucleation of Radicular Cysts — A Case Report

    Science.gov (United States)

    Kahairi, Abdullah; Ahmed Khan, Shamim; Amirozi, Ahmad

    2010-01-01

    The standard management for the majority of benign jaw cysts is enucleation, marsupialisation, curettage and decompression. Enucleation has the advantage that the whole specimen is sent for microscopic evaluation so that more sinister pathological processes (i.e. squamous cell carcinoma) may not be missed. In a large cystic lesion, enucleation is still possible, but technical difficulties might be encountered. In such instances, inevitable damage can occur to the surrounding structures. We report a case of a large radicular cyst of the maxilla that was enucleated via endoscopic assistance through the Caldwell Luc approach. PMID:22135528

  12. 33 CFR 117.444 - Falgout Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Falgout Canal. 117.444 Section 117.444 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.444 Falgout Canal. The draw of the LA 315 bridge across Falgout Canal, mile 3.1,...

  13. Developmental spinal canal stenosis and somatotype.

    OpenAIRE

    Nightingale, S.

    1989-01-01

    The hypothesis that somatotype and cervical spine developmental canal stenosis may be associated has been investigated by anthropometry and measurement of lateral projection cervical spine radiographs. A significant association of canal size with somatotype has been found such that those with developmentally narrow canals are more likely to have relatively shorter long-bones, particularly in the upper arm, and longer trunks.

  14. Effect of root canal treatment procedures with a novel rotary nickel titanium instrument (TRUShape) on stress in mandibular molars: a comparative finite element analysis.

    Science.gov (United States)

    Bonessio, Noemi; Arias, Ana; Lomiento, Guiseppe; Peters, Ove A

    2017-01-01

    The aim of this study was to investigate and compare, via finite element analysis (FEA), the effects of endodontic access and canal preparation on stress distribution under functional loading of a mandibular molar treated with novel (TRUShape) and conventional (Vortex) rotary root canal preparation instruments. Identical plastic mandibular molars with natural anatomy had all 4 canals shaped with either TRUShape or a conventional rotary, Vortex (#20 and #30, both by Dentsply Tulsa Dental). Finite element analysis was used to evaluate stress distribution in untreated and treated models. Micro-computed tomography (MCT) of the extracted teeth shaped in vitro was used to inform the FEA model regarding the geometry of root canals and external surfaces. Modeling the intact periodontal support and cancellous/cortical bone was based on anatomical data. Profiles of average and maximum von Mises stresses in dentin of the four treated conditions under functional loading were compared to the untreated model. This comparison was performed for each tooth model with and without root canal obturation and composite restoration. On average, the dentin sections with the most changes after preparation were located in the access cavity, with average stress increase up to +5.7, +8.5, +8.9, and +10.2 % for the TRUShape #20, Vortex #20, TRUShape #30 and Vortex #30, respectively, relative to the untreated model. Within the root canal system, the average stress differences were smaller than finite element analysis, preparation of the access cavity resulted in increased von Mises stresses under functional occlusal load. The limited (up to 0.7 %) retained radicular dentin in the TRUShape versus the Vortex cavity proved effective in reducing masticatory stresses. The bonded restoration modeled in this study only partially counterbalance the combined effects of access cavity and root canal preparation.

  15. Pseudoradicular and radicular low-back pain--a disease continuum rather than different entities? Answers from quantitative sensory testing.

    Science.gov (United States)

    Freynhagen, Rainer; Rolke, Roman; Baron, Ralf; Tölle, Thomas R; Rutjes, Ann-Kathrein; Schu, Stefan; Treede, Rolf-Detlef

    2008-03-01

    To assess whether pseudoradicular low-back pain may be associated with subclinical sensory deficits in the distal extremity, we applied the quantitative sensory testing protocol of the German Research Network on Neuropathic Pain (DFNS) in 15 patients with pseudoradicular pain distribution. Sixteen age- and gender-matched healthy control subjects as well as 12 patients with radicular pain syndromes (L4-S1) were studied with the same protocol. Radicular pain was diagnosed using clinical criteria (pain radiation beyond the knee, motor-, sensory-, or reflex deficits, positive Laségue's test). Z-score QST profiles revealed a selective loss of vibration detection, detection of v. Frey hair contact, and cold detection in the affected dermatomes in the radicular pain group. The contralateral dermatome was also affected, but to a lesser degree. In patients with pseudoradicular pain, the sensory profile was similar, but sensory loss was less pronounced than in the radicular pain patients. There was no significant difference between the two patient groups. Vibration detection was the most sensitive parameter with 73% abnormal values in radicular and 47% in pseudoradicular cases. These data verified the sensitivity of QST to detect sensory loss in radicular compression syndromes, and support a neuropathic component in low-back pain with radiculopathy. In contrast to some central pain syndromes this sensory loss involved predominantly large fiber functions. The subclinical sensory loss in pseudoradicular cases suggests that these patients may also have a neuropathic component of their chronic pain. The spatial incongruence of pain and sensory loss in pseudoradicular pain, however, may also indicate that the two are not causally related.

  16. Root canal morphology of Chalcolithic and early bronze age human populations of El Mirador Cave (Sierra de Atapuerca, Spain).

    Science.gov (United States)

    Ceperuelo, Dolors; Lozano, Marina; Duran-Sindreu, Fernando; Mercadé, Montse

    2014-12-01

    This study provides a morphological characterization of the inner anatomy of the root canals of permanent first and second molars in Chalcolithic and early Bronze Age human fossils using cone-beam computed tomography. The general evolutionary trend in present-day human dentition is related to morphological simplification. As little is known about when this trend appeared in Homo sapiens populations, the aim of this work is to test the presence of modern radicular morphology 4,400 years ago. Fifty-four permanent first and second maxillary and mandibular molars of 17 individuals were included in the study. All maxillary first and second molars showed three separate roots. Almost all the lower molars analyzed (100% of first molars and 75% of second molars) had two separate roots. More differences in the canal system configuration were documented in the maxillary mesiobuccal roots than in the palatal or distobuccal roots. The most variable tooth in root and canal configuration is the maxillary second molar. It should be pointed out that 12.5% of the teeth analyzed showed a C-shaped root configuration.

  17. Canal Water Scarcity Hits Farmers

    Institute of Scientific and Technical Information of China (English)

    张忠潮

    2007-01-01

    Acute shortage of canal water for irrigation in this district has caused resentment among the farmers.The water is being released in the various channels for just one week in a month,which is not enough to meet the irrigation needs of the farmers who are preparing their fields for paddy

  18. The Dehiscent Facial Nerve Canal

    Directory of Open Access Journals (Sweden)

    Sertac Yetiser

    2012-01-01

    Full Text Available Accidental injury to the facial nerve where the bony canal defects are present may result with facial nerve dysfunction during otological surgery. Therefore, it is critical to know the incidence and the type of facial nerve dehiscences in the presence of normal development of the facial canal. The aim of this study is to review the site and the type of such bony defects in 144 patients operated for facial paralysis, myringoplasty, stapedotomy, middle ear exploration for sudden hearing loss, and so forth, other than chronic suppurative otitis media with or without cholesteatoma, middle ear tumors, and anomaly. Correlation of intraoperative findings with preoperative computerized tomography was also analyzed in 35 patients. Conclusively, one out of every 10 surgical cases may have dehiscence of the facial canal which has to be always borne in mind during surgical manipulation of the middle ear. Computerized tomography has some limitations to evaluate the dehiscent facial canal due to high false negative and positive rates.

  19. [Endodontic microbiology: antimicrobial canal medications].

    Science.gov (United States)

    Seltzer, S; Farber, P A

    1989-06-01

    Medicaments used for reducing or eliminating microorganisms from infected root canals include: irrigating solutions, such as sodium hypochlorite, urea peroxide and hydrogen peroxide, chloramine, iodine-potassium-iodide solution, and chlorhexidine solution. In addition, various intracanal drugs, such as calcium hydroxide and antibiotics, are in use. The characteristics of these drugs are discussed.

  20. COMPARACION DE DOS TECNICAS DE LIMPIEZA ULTRASONICA DEL SISTEMA DE CONDUCTOS RADICULARES POR MEDIO DE LA ESCALA DE ROME

    OpenAIRE

    Mondragon Montaño, Alejandro

    2012-01-01

    INTRODUCCION El tratamiento del conducto radicular se puede resumir como una serie de procedimientos para la limpieza, conformación y obturación del sistema de conductos radiculares. El desarrollo de una lesión periapical significa presencia de bacterias en el sistema de conductos especialmente en la porción apical donde éstas se pueden alojar en el barro dentinario o invadir los túbulos dentinarios. Los problemas en la limpieza y conformación se han traducido en una ampl...

  1. Microbiología de la caries radicular en el paciente mayor Microbiology of the root caries in old patients

    OpenAIRE

    D Gutiérrez Acero; L Alós Cortés; García Gómez, F.; A González Sanz

    2006-01-01

    La caries radicular es uno de los problemas bucodentales más importantes y que más comúnmente afectan al adulto mayor. La caries radicular es aquel proceso carioso que se produce sobre la raíz expuesta del diente. Los principales patógenos implicados son el Streptococcus mutans, el Actinomyces viscosus y el Lactobacillus acidofilus, que producen los ácidos orgánicos que desmineralizan el cemento y la dentina de la raíz, llegando producir su cavitación. Los cambios que se producen en el medio ...

  2. Influência da largura do septo inter-radicular sobre a estabilidade dos mini-implantes Influence of inter-root septum width on mini-implant stability

    Directory of Open Access Journals (Sweden)

    Mariana Pracucio Gigliotti

    2011-04-01

    Full Text Available OBJETIVO: este estudo teve como objetivo avaliar a influência da largura do septo inter-radicular no local de inserção de mini-implantes autoperfurantes sobre o grau de estabilidade desses dispositivos de ancoragem. MÉTODOS: a amostra consistiu de 40 mini-implantes inseridos entre as raízes do primeiro molar e segundo pré-molar superiores de 21 pacientes, com o intuito de fornecer ancoragem para retração anterior. A largura do septo no local de inserção (LSI foi mensurada nas radiografias pós-cirúrgicas e, sob esse aspecto, os mini-implantes foram divididos em dois grupos: grupo 1 (áreas críticas, LSI3mm. A estabilidade dos mini-implantes foi avaliada mensalmente pela quantificação do grau de mobilidade e a partir dessa variável foi calculada a proporção de sucesso. Avaliou-se também: a quantidade de placa, altura de inserção, grau de sensibilidade e período de observação. RESULTADOS: os resultados obtidos demonstraram que não houve diferença estatisticamente significativa para o grau de mobilidade e proporção de sucesso entre os mini-implantes inseridos em septos de largura mesiodistal crítica e não crítica. A proporção de sucesso total encontrada foi de 90% e nenhuma variável demonstrou estar relacionada ao insucesso dos mini-implantes. No entanto, observou-se maior sensibilidade nos pacientes cujos mini-implantes apresentavam mobilidade, e que a falha desses dispositivos de ancoragem ocorria logo após sua inserção. CONCLUSÃO: a largura do septo inter-radicular no local de inserção não interferiu na estabilidade dos mini-implantes autoperfurantes avaliados neste estudo.OBJECTIVE: The purpose of this study was to evaluate the influence of the inter-radicular septum width in the insertion site of self-drilling mini-implants on the stability degree of these anchorage devices. METHODS: The sample consisted of 40 mini-implants inserted in the inter-radicular septum between maxillary second premolars and

  3. Mandibular Second Premolar with Four Canals

    Directory of Open Access Journals (Sweden)

    Javad Ghiasi

    2015-09-01

    Full Text Available A mandibular second premolar with four canals is an interesting example of anatomic variations. This report describes a case of a mandibular second premolar with three roots and four canals (one mesiobuccal, two distobuccal and one lingual. The canals were prepared using K-files and irrigated with NaOCl (5.25% and normal saline as the final irrigant. The canals were filled laterally with gutta percha and AH26 sealer (De Trey, Dentsply, Switzerland. This case shows a rare anatomic configuration and points out the importance of looking for additional canals.

  4. Lumbar spinal imaging in radicular pain and related conditions. Understanding diagnostic images in a clinical context

    Energy Technology Data Exchange (ETDEWEB)

    Wilmink, Jan T. [University Hospital Maastricht (Netherlands). Dept. Radiology

    2010-07-01

    There is general agreement that lumbosacral nerve root compression is a prime factor in the pathogenesis of sciatica and neurogenic claudication, although humoral and vascular factors certainly play a role as well. This book focuses on imaging of the various ways in which nerve root compression can come about, and assessing which anatomic features are reliably associated with the occurrence of radicular pain, as opposed to morphologic findings which are probably coincidental. After a discussion of the nature of radicular pain and related symptoms, spinal imaging techniques and options are reviewed, with emphasis on the role of MR myelography in assessing the condition of the intradural nerve roots. A chapter on normal topographic, sectional, and functional (dynamic) radiologic anatomy is followed by a presentation on pathologic anatomy, addressing the various mechanisms of nerve root compression. In the chapter on pre- and postoperative imaging, features which may help to predict the evolution of the symptoms are discussed, with an eye to selecting candidates for surgical treatment. This is followed by a discussion of the role and limitations of imaging studies in various adverse postoperative conditions. In illustrations involving patient studies, imaging features are linked where possible to the clinical symptoms and history of the individuals involved. (orig.)

  5. Characterization of the soil fertility and root system of restinga forests Caracterização da fertilidade do solo e sistema radicular de floresta de restinga

    Directory of Open Access Journals (Sweden)

    Rodolfo Martins Bonilha

    2012-12-01

    complexo mosaico encontram-se as fitofisionomias de florestas de restinga em estádio de elevada regeneração (restinga alta e em estádio de média regeneração (restinga baixa, cada qual com suas características vegetais que as diferenciam. O clima no litoral é do tipo tropical (Köppen. A Restinga, de todos os ecossistemas associados à Mata Atlântica, é o mais frágil e suscetível às perturbações antrópicas. As plantas respondem às características do solo por meio de modificações fisiológicas e morfológicas, de modo a alterar a arquitetura (configuração espacial de seus sistemas radiculares. Este estudo teve por objetivo caracterizar a fertilidade do solo, por meio dos parâmetros químicos e físicos, sob floresta de restinga alta e baixa, com relação à distribuição do sistema radicular no perfil do solo. Foram estudados quatro locais: (1 Parque Estadual da Ilha Anchieta, município de Ubatuba; (2 Estação Ecológica Jureia-Itatins, Estação Ecológica dos Chauás, município de Iguape; (3 Vila de Pedrinhas, no município de Ilha Comprida; e (4 Parque Estadual da Ilha do Cardoso, município de Cananeia. Os estudos sobre fertilidade do solo foram feitos nas profundidades de 0-5, 0-10, 0-20, 20-40 e 40-60 cm, para as análises químicas e físicas. Também foi avaliada a distribuição do sistema radicular no perfil do solo, utilizando imagens digitais e o programa Spring. Conclui-se que o sistema radicular, para todas as fitofisionomias estudadas, encontra-se nas camadas mais superficiais, 0-10 e 10-20 cm, principalmente na primeira (80 %; que todos os ambientes estudados apresentaram baixa fertilidade do solo, com valores de saturação por bases inferiores a 16 %, em que a maior parte da CTC está ocupada por Al3+; e que a vegetação de restinga é edáfica.

  6. Grupos vivenciais sob uma perspectiva junguiana

    Directory of Open Access Journals (Sweden)

    Laura Villares de Freitas

    2005-09-01

    Full Text Available Este artigo tece considerações quanto à possibilidade e ao alcance de grupos vivenciais, sob a perspectiva da Psicologia Analítica de Carl G. Jung, em nosso contexto socio-econômico atual. Há uma proposta prática de grupos de construção de máscaras e personagens, e a apresentação e comentários das contribuições de diferentes autores que trazem conceitos junguianos clássicos para a dimensão grupal, consideram de maneira criativa o ritual, do ponto de vista psicológico, e questionam a viabilidade de trabalhos grupais. Numa abordagem mitológica, são considerados Górgona, Dioniso, Ártemis, Eco e Narciso, com destaque à deusa grega Héstia, cujas características são relacionadas a aspectos necessariamente presentes nos grupos vivenciais e à possibilidade de ocorrer uma experiência psicológica. Os grupos vivenciais são considerados favorecedores da perspectiva de alteridade, na medida em que cada participante tem neles a oportunidade de se afirmar e de ser confirmado, isto é, de se expressar e de refletir, num campo interacional fértil.

  7. Prevalencia del segundo canal en la raíz mesiovestibular de los primeros molares maxilares mediante tomografía computarizada de haz de cono Prevalence of a second canal in the mesiobuccal root of maxillary first molars by Cone-Beam Computed Tomography

    Directory of Open Access Journals (Sweden)

    P. Betancourt

    2013-02-01

    Full Text Available Introducción: La morfología del sistema de canales radiculares es compleja y variable. El primer molar maxilar permanente presenta habitualmente un segundo canal en la raíz mesiobucal (MB2. Su falta de localización y total desbridamiento, es la principal causa de fracaso terapéutico. El objetivo fue determinar la prevalencia in vivo del canal MB2 en la raíz mesiovestibular de primeros molares maxilares mediante tomografía computarizada de haz de cono (TCHC. Material y método: Se examinaron imágenes TCHC de primeros molares maxilares, izquierdos y derechos, en ambos sexos. Se excluyeron las raíces con canales radiculares tratados endodónticamente o con postes, rehabilitados mediante prótesis fija, calcificación de canales, evidencia de radectomía o cirugía periapical. Fueron seleccionadas 32 imágenes TCHC. En todos los casos, se realizó un estudio sistemático de la raíz mesiobucal a través de cortes en el plano axial. Resultados: Se observó una prevalencia del 68,75% del canal MB2. No se encontraron diferencias según sexo o lateralidad. El promedio de edad fue de 25,31 años de edad. Discusión: La alta prevalencia encontrada del canal MB2, debe ser considerada antes de establecer un tratamiento de endodoncia para lograr un resultado óptimo y evitar el fracaso terapéutico. La TCHC es una herramienta útil para su detección, y presenta alta sensibilidad.Introduction: The morphology of the root canal system is complex and variable. The first permanent maxillary molar has usually a second canal in the mesiobuccal root (MB2. Its location and total lack of debridement, is the leading cause of treatment failure. The objective was to determine in vivo the prevalence of MB2 canal in mesiobuccal root of maxillary first molars using Cone-beam computed tomography (CBCT. Methods: CBCT images of first maxillary molars, left and right, in both sexes, were reviewed. We excluded roots endodontically treated or with posts, rehabilitated

  8. Preparación de canales curvos y calcificados

    Directory of Open Access Journals (Sweden)

    Karen Sofia Gallego Lopez

    2013-10-01

    Full Text Available ResumenLa preparación durante el tratamiento endodóntico consiste en la correcta limpieza y conformación del sistema de conductos radiculares, y que conserve siempre su forma original. Al finalizar la preparación, se debe obtener un conducto con conicidad uniforme y con un tope apical, que permita un selle hermético al momento de la obturación. Se debe tener en cuenta la dificultad para lograr resultados satisfactorios sobre todo en conductos curvos y calcificados debido a la complejidad de éstos. Las técnicas implementadas y el instrumental adecuado para la preparación de conductos, han sido muchos con el fin de minimizar los errores durante la preparación. No obstante, ninguna técnica ni instrumental por sí solo resulta ideal en la prevención de estos errores; es necesario el cumplimiento de algunos principios básicos durante la preparación de estos conductos, tales como la correcta preparación coronal, el uso continuo de irrigantes y agentes quelantes, el mantenimiento de la permeabilidad, el limado anticurvatura y la doble conicidad. La incorrección de estos principios conlleva a errores, los cuales dificultan el éxito del tratamiento endodóntico. Los avances de la ciencia y el advenimiento de los instrumentos de níquel-titanio, han logrado facilitar el tratamiento de endodoncia, tanto que ya no es considerado como anteriormente se le atribuía que era un procedimiento difícil, lo importante predecir la orientación y anatomía del conducto antes de emplear técnicas o instrumentales, ya que un error en ellas nos llevará al fracaso del tratamiento. (DUAZARY 2011, 66 - 73AbstractThe preparation for the endodontic treatment is proper cleaning and shaping the root canal system, and always keep its original shape. After the preparation, must be obtained through uniform and tapered with an apical stop, allowing a tight seal when the seal. It must take into account the difficulty of achieving satisfactory results especially

  9. 75 FR 39632 - Regulated Navigation Area; Gulf Intracoastal Waterway, Inner Harbor Navigation Canal, Harvey...

    Science.gov (United States)

    2010-07-12

    ..., Inner Harbor Navigation Canal, Harvey Canal, Algiers Canal, New Orleans, LA; Correction ACTION: Interim... Navigation Canal, Harvey Canal, Algiers Canal, New Orleans, LA into the Code of Federal Regulations....

  10. Morphological alterations on human radicular dentin after exposure to different fruit juice drinks = Alterações morfológicas na dentina radicular após exposição a diferentes sucos de fruta

    Directory of Open Access Journals (Sweden)

    Zandim, Daniela Leal

    2011-01-01

    Conclusão: Com base na metodologia utilizada, pode-se concluir que os diferentes sucos de fruta não promoveram alterações significativas na morfologia da dentina radicular apesar da realização subsequente de procedimentos de escovação

  11. Influence the translucence of glass fiber posts and time of photoactivation of a dual cement bond strength to root dentin

    OpenAIRE

    FELIPE AUGUSTO VILLA

    2012-01-01

    O objetivo deste estudo in vitro foi avaliar por meio do teste de push-out, se a utilização de pinos de fibra de vidro opaco (Exacto Angelus [PO]) e translúcido (Exacto Translúcido Angelus [PT]), cimentados adesivamente no canal radicular com cimento resinoso de presa dual (Variolink II Ivoclar Vivadent) sob diferentes tempos de fotoativação apresentavam influência na resistência de união nos três diferentes terços do canal radicular. Quarenta e oito pré-molares unirradiculares human...

  12. El Surco Palato Radicular: Su relación con patología pulpar y/o periodontal

    Directory of Open Access Journals (Sweden)

    R.M. Pulgar Encinas

    2000-09-01

    Full Text Available La presencia de anomalías morfológicas radiculares pueden actuar como factor predisponente para el acúmulo de placa y el desarrollo de patología periodontal y/o pulpar. Presentamos un caso clínico de surco palatoradicular en el 21, donde la presencia del surco ha sido el factor causal de una bolsa periodontal con defecto óseo aislado que finalmente condujo a la pérdida del diente. Se analiza la prevalencia, localizaciones, patogenia y la actitud terapéutica correcta ante la presencia de este tipo de anomalías, en base a los datos recogidos de la literatura.The presence of radicular anomalies may act as a predisposing factor for the accumulation of bacterial plaque and the development of local periodontal or pulpal disease. We present a case of palato-radicular groove in tooth Nº.21 that caused periodontal pocket and localized bone defect leading to loss of the tooth. We review the prevalence, localizations and pathogenesis of this dental abnormality as well as therapeutic approaches reported in the literature. The palato-radicular groove:relationship with pulpar and/or periodontal desease.

  13. Intrathecal injection of spironolactone attenuates radicular pain by inhibition of spinal microglia activation in a rat model.

    Directory of Open Access Journals (Sweden)

    Yu-e Sun

    Full Text Available BACKGROUND: Microglia might play an important role in nociceptive processing and hyperalgesia by neuroinflammatory process. Mineralocorticoid receptor (MR expressed on microglia might play a central role in the modulation of microglia activity. However the roles of microglia and MR in radicular pain were not well understood. This study sought to investigate whether selective MR antagonist spironolactone develop antinociceptive effects on radicular pain by inhibition neuroinflammation induced by spinal microglia activation. RESULTS: Radicular pain was produced by chronic compression of the dorsal root ganglia with SURGIFLO™. The expression of microglia, interleukin beta (IL-1β, interleukin 6 (IL-6, tumor necrosis factor alpha (TNF-α, NR1 subunit of the NMDA receptor (t-NR1, and NR1 subunit phosphorylated at Ser896 (p-NR1 were also markedly up-regulated. Intrathecal injection of spironolactone significantly attenuated pain behaviors as well as the expression of microglia, IL-1β, TNF-α, t-NR1, and p-NR1, whereas the production of IL-6 wasn't affected. CONCLUSION: These results suggest that intrathecal delivery spironolactone has therapeutic effects on radicular pain in rats. Decreasing the activation of glial cells, the production of proinflammatory cytokines and down-regulating the expression and phosphorylation of NMDA receptors in the spinal dorsal horn and dorsal root ganglia are the main mechanisms contributing to its beneficial effects.

  14. Scalloping at the lumbosacral canal

    Energy Technology Data Exchange (ETDEWEB)

    Reinhardt, R.

    1987-07-01

    Scalloping is an indentation of the dorsal side of the vertebral body (anterior wall of the lumbosacral or sacral canal) which typically involves several adjacent lumbal vertebral body segments and the anterior wall of the canalis sacralis. Occurrence without underlying disease is rare; it occurs most frequently with chondrodystrophy, neurofibromatosis, Morquio's syndrome, Hurler's syndrome, acromegaly, Ehlers-Danlos syndrome, Marfan's syndrome, cysts, tumors and in peridural lipomas.

  15. Estudio comparativo de la cavidad de acceso radicular en conductos curvos con limas de níquel-titanio y taladros de acero inoxidable

    OpenAIRE

    Oncins Rodríguez, J.; Pumarola Suñé, José; Canalda Sahli, Carlos

    2005-01-01

    El propósito de este estudio fue comparar la cantidad de dentina radicular removida y evaluar el mantenimiento de la forma del conducto tras la instrumentación de los dos tercios coronarios radiculares, utilizando instrumentos de acero inoxidable (taladros de Gates Glidden) y de níqueltitanio (limas GT Flare y limas Orifice Shaper). Un total de 42 dientes humanos extraídos con conductos radiculares curvos fueron divididos en tres grupos. Los conductos se instrumentaron mecánicamente usando ta...

  16. Nested Canalizing Functions and Their Networks

    CERN Document Server

    Kadelka, Claus; Adeyeye, John O; Laubenbacher, Reinhard

    2014-01-01

    The concept of a nested canalizing Boolean function has been studied over the last decade in the context of understanding the regulatory logic of molecular interaction networks, such as gene regulatory networks. Such networks are predominantly governed by nested canalizing functions. Derrida values are frequently used to analyze the robustness of a Boolean network to perturbations. This paper introduces closed formulas for the calculation of Derrida values of networks governed by Boolean nested canalizing functions, which previously required extensive simulations. Recently, the concept of nested canalizing functions has been generalized to include multistate functions, and a recursive formula has been derived for their number, as a function of the number of variables. This paper contains a detailed analysis of the class of nested canalizing functions over an arbitrary finite field. In addition, the concept of nested canalization is further generalized and closed formulas for the number of such generalized fun...

  17. Stability of guest molecules in urea canal complexes by canal polymerization

    Energy Technology Data Exchange (ETDEWEB)

    Yoshii, Fumio; Makuuchi, Keizo [Japan Atomic Energy Research Inst., Takasaki, Gunma (Japan). Takasaki Radiation Chemistry Research Establishment

    1995-03-01

    It was found that various organic materials are attracted into urea canal by hexanediol diacrylate (HDDA) and long chain compounds. This means that materials which does not form complex by itself are induced in canal by HDDA and long chain compounds. To include with stability perfumes, insecticides, attractants and repellents in urea canal, leaf alcohol was used as a model compound for guest molecules in the canal. The leaf alcohol from the canal released gradually over many days and the release was inhibited for 15 days by long chain compounds and for 30 days by polymerized HDDA after irradiation. After releasing, the leaf alcohol in the canal remained 25 % stable for long chain compounds and 40 % for polymerized HDDA. The dose required for stabilization of leaf alcohol in the urea canal by canal polymerization of HDDA was 30 kGy. (author).

  18. Canals, DMADCanals-Irrigation canals in Millard Co., Published in 2007, Millard County.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Canals dataset, was produced all or in part from Other information as of 2007. It is described as 'DMADCanals-Irrigation canals in Millard Co.'. Data by this...

  19. Squamous odontogenic tumor-like proliferation in a radicular cyst: A case report

    Science.gov (United States)

    Marco-Molina, Vicente; Gay-Escoda, Cosme

    2013-01-01

    The squamous odontogenic tumour is a rare benign neoplasm whose aetiology remains unknown. It usually appears in the jaw and its origin could be related to the ephitelial remnants of Malassez. Histologically comprises numerous islets of squamous, non-keratinized, well-differentiated and rounded epithelial cells a fibrous stroma without signs of atypical cells. There is a non-neoplastic lesion with the same histological pattern than the squamous odontogenic tumour. This entity is characterized by squamous odontogenic tumour proliferations isolated into the cyst wall of an odontogenic cyst. It is rare and has a benign behavior. It has been suggested that these epithelial proliferations could be the former expression of the neoplastic form. It is very important to carry out clinical and radiological controls periodically. So far it has not been documented any change towards a squamous odontogenic tumour nor toward malignancy in a squamous odontogenic tumour like proliferation. Key words:Radicular cyst, squamous odontogenic tumour. PMID:24455099

  20. Reabsorción radicular en ortodoncia: revisión de la literatura

    OpenAIRE

    Lozano-Chourio, María Alexandra; Pontificia Universidad Javeriana; Ruiz Rojas, Adriana Lorena; Pontificia Universidad Javeriana

    2009-01-01

    El presente artículo es una revisión de la literatura acerca de la reabsorción radicular externa y los factores biológicos y mecánicos que predisponen su aparición en pacientes bajo tratamiento de ortodoncia. Se describen factores genéticos, sistémicos y farmacológicos, las edades cronológica y dental, el estado nutricional, el género, la raza, los hábitos, la morfología, el tamaño y número dental, las reabsorciones y traumas dentales previos, las infecciones periapicales, los factores oclusa...

  1. Combined treatment of a lateral incisor with palato-radicular groove: 1 year follow-up

    Directory of Open Access Journals (Sweden)

    Gülen Kamak

    2014-01-01

    Full Text Available Periodontic - endodontic lesion with a palato-radicular groove as a contributing factor for periodontitis is the most important diagnostic and therapeutic challenges faced by periodontists and the maxillary lateral incisors are the most frequently affected teeth. These developmental grooves promotes the accumulation of plaque and calculus, which destroys the sulcular epithelium and later deeper parts of the periodontium, finally resulting in the formation of a severe localized periodontal lesion since proper cleaning of that site is difficult, if not impossible, for the patient. There are different types of treatment such as scaling and root planning, odontoplasty, amalgam restoration, and extraction of the tooth to treat palatogingival groove and associated periodontal bone defects. In this case, a successful management of an endodontic-periodontal combined lesion by combined treatment and guided tissue regeneration was presented.

  2. Radicular lower extremity pain as the first symptom of primary hyperparathyroidism

    Energy Technology Data Exchange (ETDEWEB)

    Mustonen, Antti O.T.; Kiuru, Martti J.; Koskinen, Seppo K. [Toolo Trauma Center, Helsinki University Central Hospital, Topeliuksenkatu 5, 00029, Helsinki (Finland); Stahls, Anders; Bohling, Tom [Department of Pathology, Haartman Institute, University of Helsinki, 00014, Helsinki (Finland); Kivioja, Aarne [Department of Orthopedics and Traumatology, Helsinki University Central Hospital, 00029, Helsinki (Finland)

    2004-08-01

    Clinical symptoms of hyperparathyroidism are generally nausea, vomiting, fatigue, constipation, and hypotonicity of the muscles and ligaments; bone pain and tenderness are also seen but are more common in secondary hyperparathyroidism. We report a histologically confirmed case of a 28-year-old man whose sole symptom of primary hyperparathyroidism was lower extremity radicular pain due to a vertebral brown tumor. Magnetic resonance imaging demonstrated brown tumor to be hyperintense on T2-weighted and slightly hypointense on T1-weighted sequences; it showed intense contrast enhancement with gadolinium. Because brown tumors usually contain hemosiderin a short T2 should have been expected, but this was not seen in our case. Healing resulted in decreasing contrast enhancement on T1-weighted sequences and increasingly short T2. To our knowledge, this is the first report of a lumbar vertebral brown tumor associated with primary hyperparathyroidism. (orig.)

  3. MRI Findings in Spinal Canal Stenosis

    OpenAIRE

    Maryam Barzin

    2010-01-01

    Spinal canal stenosis results from progressive narrowing of the central spinal canal and the lateral recesses. Primary (congenital) lumbar spinal stenosis is associated with achondroplastic dwarfism. The spinal canal may become narrowed by bulging or protrusion of the intervertebral disc annulus, herniation of the nucleus pulposus posteriorly, thickening of the posterior longitudinal ligament, hypertrophy of the facet joints, hypertrophy of the ligamentum flavum, epidural fat deposition, spon...

  4. Low intensity permanent magnets in the treatment of chronic lumbar radicular pain.

    Science.gov (United States)

    Khoromi, Suzan; Blackman, Marc R; Kingman, Albert; Patsalides, Athos; Matheny, Leigh Ann; Adams, Sandra; Pilla, Arthur A; Max, Mitchell B

    2007-10-01

    We assessed the pain-relieving efficacy of static magnetic fields produced by 200 Gauss (G) magnets compared with 50G magnets in a double-blind, randomized, two-phase crossover study in patients with chronic lumbar radicular pain. The surface field strengths of the magnets were 200 and 50G. Phase I included four random periods of two-week duration: two periods with 200G, one period with 50G, and one period of "no treatment." The magnets were positioned either vertically or horizontally in standard lumbosacral elastic corsets. Phase II consisted of two five-week periods with the most effective magnet from Phase I and its corresponding 50 or 200G device. The primary outcome was average daily leg pain score (0-10 scale) in each period of Phase II. Thirty-eight of 40 randomized patients completed Phase I, and 28 of 31 Phase II participants completed the study. In Phase I, pain scores did not differ significantly between 200 and 50G magnets. Phase II average leg pain scores tended to be lower with 200 vs. 50G magnets (3.2+/-2.1 for 200G vs. 3.9+/-2.2 for 50G magnets [P=0.08]) after excluding one unblinded patient. The relative treatment effect of the 200G magnets appeared to increase throughout the five-week period. Although these data cannot rule out a chance effect, the positive trends suggest that larger, longer-duration, sham-controlled trials with 200G magnets be considered in patients with chronic lumbar radicular pain.

  5. Modelling of Buckingham Canal water quality.

    Science.gov (United States)

    Abbasi, S A; Khan, F I; Sentilvelan, K; Shabudeen, A

    2002-10-01

    The paper presents a case study of the modelling of the water quality of a canal situated in a petrochemical industrial complex, which receives wastewaters from Madras Refineries Limited (MRL), and Madras Fertilizers Limited (MFL). The canal well known Buckingham Canal which passes through Chennai (Madras), India has been modelled using the software QUAL2E-UNCAS. After testing and validation of the model, simulations have been carried out. The exercise enables forecasting the impacts of different seasons, base flows, and waste water inputs on the water quality of the Buckingham Canal. It also enables development of water management strategies.

  6. Apical and periapical repair of dogs' teeth with periapical lesions after endodontic treatment with different root canal sealers Reparação apical e periapical de dentes de cães com lesão periapical crônica após tratamento endodôntico utilizando diferentes materiais obturadores

    Directory of Open Access Journals (Sweden)

    Mário Roberto Leonardo

    2003-03-01

    Full Text Available The aim of this study was to evaluate the apical and periapical repair after root canal treatment of dogs' teeth with pulp necrosis and chronic periapical lesion using different root canal sealers. After periapical lesion induction, forty-four root canals of 3 dogs were submitted to biomechanical preparation using 5.25% sodium hypochlorite as an irrigating solution. A calcium hydroxide dressing (Calen PMCC was applied for 15 days and the root canals were filled using the lateral condensation technique with gutta-percha points and Sealapex, AH Plus or Sealer Plus for sealing. After 180 days, the animals were sacrificed by anesthetic overdose and the obtained histological sections were stained with hematoxylin-eosin for optical microscopic analysis of the apical and periapical repair. The groups filled with Sealapex and AH Plus had better histological repair (p O objetivo do presente estudo foi avaliar a reparação apical e periapical pós-tratamento endodôntico de dentes de cães com necrose pulpar e reação periapical crônica, em que se utilizaram diferentes materiais obturadores. Foram utilizados 44 canais radiculares, nos quais, após indução das lesões periapicais, foi efetuado o preparo biomecânico empregando-se como solução irrigadora uma solução de hipoclorito de sódio a 5,25%. Após curativo de demora com pasta à base de hidróxido de cálcio (Calen PMCC, mantida no canal radicular durante 15 dias, os canais radiculares foram obturados pela técnica clássica complementada pela condensação lateral ativa, empregando-se os cimentos Sealapex, AH Plus ou Sealer Plus. Decorrido o período de 180 dias, os animais foram mortos e as peças submetidas ao processamento laboratorial. Os cortes histológicos obtidos foram corados com hematoxilina-eosina. A análise histopatológica demonstrou que nos canais radiculares obturados com os cimentos Sealapex e AH Plus ocorreu melhor reparação (p < 0,05 do que nos canais obturados com o

  7. Narrow, duplicated internal auditory canal

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, T. [Servico de Neurorradiologia, Hospital Garcia de Orta, Avenida Torrado da Silva, 2801-951, Almada (Portugal); Shayestehfar, B. [Department of Radiology, UCLA Oliveview School of Medicine, Los Angeles, California (United States); Lufkin, R. [Department of Radiology, UCLA School of Medicine, Los Angeles, California (United States)

    2003-05-01

    A narrow internal auditory canal (IAC) constitutes a relative contraindication to cochlear implantation because it is associated with aplasia or hypoplasia of the vestibulocochlear nerve or its cochlear branch. We report an unusual case of a narrow, duplicated IAC, divided by a bony septum into a superior relatively large portion and an inferior stenotic portion, in which we could identify only the facial nerve. This case adds support to the association between a narrow IAC and aplasia or hypoplasia of the vestibulocochlear nerve. The normal facial nerve argues against the hypothesis that the narrow IAC is the result of a primary bony defect which inhibits the growth of the vestibulocochlear nerve. (orig.)

  8. Arquitetura e dimensão do sistema radicular de sete porta-enxertos de videira no Norte do Estado do Paraná

    Directory of Open Access Journals (Sweden)

    Bordin Ivan

    2003-01-01

    Full Text Available Foi estudada a estrutura do sistema radicular de sete porta-enxertos de videira das cultivares IAC 572, Kobber 5BB, Rupestris du Lot, IAC 313, IAC 766, Ripária do Traviú e 420 A, com cinco anos de idade. As raízes foram expostas por escavação e avaliadas pelo programa SIARCS 3.0. Foi utilizado um diagrama de arquitetura radicular, atribuindo-se notas à conformação do sistema radicular. O 'IAC 572' apresentou a maior extensão de raízes e o '420 A', a menor. Os porta-enxertos não apresentaram diferença quanto à arquitetura do sistema radicular. Os mais vigorosos apresentaram maior proporção de raízes enoveladas.

  9. Bilateral duplication of the internal auditory canal

    Energy Technology Data Exchange (ETDEWEB)

    Weon, Young Cheol; Kim, Jae Hyoung; Choi, Sung Kyu [Seoul National University College of Medicine, Department of Radiology, Seoul National University Bundang Hospital, Seongnam-si (Korea); Koo, Ja-Won [Seoul National University College of Medicine, Department of Otolaryngology, Seoul National University Bundang Hospital, Seongnam-si (Korea)

    2007-10-15

    Duplication of the internal auditory canal is an extremely rare temporal bone anomaly that is believed to result from aplasia or hypoplasia of the vestibulocochlear nerve. We report bilateral duplication of the internal auditory canal in a 28-month-old boy with developmental delay and sensorineural hearing loss. (orig.)

  10. 33 CFR 117.285 - Grand Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Grand Canal. 117.285 Section 117.285 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.285 Grand Canal. (a) The draw of the Lansing Island bridge, mile 0.7, shall open on...

  11. 33 CFR 117.453 - Houma Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Houma Canal. 117.453 Section 117.453 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.453 Houma Canal. The draw of the S3197 bridge, mile 1.7 at Houma, shall open on signal...

  12. 33 CFR 117.438 - Company Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Company Canal. 117.438 Section 117.438 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.438 Company Canal. (a) The draw of the S1 bridge, mile 0.4 at Lockport, shall open...

  13. Neuronal hyperplasia in the anal canal

    DEFF Research Database (Denmark)

    Fenger, C; Schrøder, H D

    1990-01-01

    In a consecutive series of minor surgical specimens from the anal canal, neuronal hyperplasia was found in nine of 56 haemorrhoidectomy specimens and in four of 23 fibrous polyps. In an additional series of 14 resections of the anal canal, neuronal hyperplasia was present in six cases, of which...

  14. 33 CFR 117.787 - Gowanus Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Gowanus Canal. 117.787 Section 117.787 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements New York § 117.787 Gowanus Canal. The draws of the Ninth Street Bridge, mile 1.4, the Third...

  15. Blending Canal Surfaces Based on PH Curves

    Institute of Scientific and Technical Information of China (English)

    Chen-Dong Xu; Fa-Lai Chen

    2005-01-01

    In this paper, a new method for blending two canal surfaces is proposed. The blending surface is itself a generalized canal surface, the spine curve of which is a PH (Pythagorean-Hodograph) curve. The blending surface possesses an attractive property - its representation is rational. The method is extensible to blend general surfaces as long as the blending boundaries are well-defined.

  16. 33 CFR 117.445 - Franklin Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Franklin Canal. 117.445 Section 117.445 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.445 Franklin Canal. The draw of the Chatsworth Bridge, mile 4.8 at Franklin, shall...

  17. 33 CFR 117.1045 - Hood Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Hood Canal. 117.1045 Section 117.1045 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Washington § 117.1045 Hood Canal. The draw of the Washington State pontoon highway bridge near...

  18. DESIGN OF SEDIMENT TRANSPORTING CANAL SECTIONS

    Institute of Scientific and Technical Information of China (English)

    Prabhata K.SWAMEE; Nimisha SWAMEE

    2004-01-01

    Design equations for minimum area or maximum velocity canal-sections for transport of bulk sediment carried by water have been obtained. Such canals are economically feasible in the terrain where large slopes are available. The design procedure is illustrated by a practical example.

  19. Evaluación tomográfica y radiográfica de la obturación radicular tridimensional de conductos radiculares únicos tratados con tres técnicas de obturación radicular: Estudio in Vitro

    Directory of Open Access Journals (Sweden)

    Mónica Alexandra Pavón Granja

    2016-09-01

    Full Text Available El principal reto durante la terapia endodóntica es la obturación radicular, considerada como fase crítica ya que de esta va a depender el éxito o el fracaso. Por varios años se ha investigado tanto materiales como técnicas que permitan el sellado hermético tridimensional del sistema de conductos radiculares, biocompatibilidad que permita la adecuada reparación de los tejidos periapicales y que la obturación se mantenga con el tiempo proporcionando salud. Objetivo: Evaluar la adaptación tridimensional de tres técnicas de obturación radicular definitiva a nivel del tercio apical de conductos radiculares únicos. Materiales y métodos: Estudio de tipo experimental y aleatorizado, la muestra fue de 42 raíces de dientes uniradiculares divididos en 3 grupos de estudio (n=14, previamente se realizó un registro radiográfico periapical digital de toda la muestra posteriormente fueron instrumentados con técnica hibrida, desinfectados con NaOCl al 5,25% + activación ultrasónica y EDTA al 17%, GA fue sometido a técnica de obturación lateral en frío, GB aplicado técnica de obturación termomecánica McSpadden y GC se obturó con técnica termoplastificada (BeFill-VDW. Resultados: Los grupos C y B observados a través de tomografía computarizada presentaron mejores resultados de obturación radicular que el grupo A que no presentó un buen sellado apical, sin embargo, en el grupo C se observó mejores resultados que en A y B Conclusiones: Las técnicas de obturación radicular definitivas con la técnica termoplastificada mostraron ser ideales para proporcionar un sellado apical hermético durante el tratamiento endodóntico en la fase de obturación

  20. Tissue engineering in endodontics: root canal revascularization.

    Science.gov (United States)

    Palit Madhu Chanda; Hegde, K Sundeep; Bhat, Sham S; Sargod, Sharan S; Mantha, Somasundar; Chattopadhyay, Sayan

    2014-01-01

    Root canal revascularization attempts to make necrotic tooth alive by the use of certain simple clinical protocols. Earlier apexification was the treatment of choice for treating and preserving immature permanent teeth that have lost pulp vitality. This procedure promoted the formation of apical barrier to seal the root canal of immature teeth and nonvital filling materials contained within root canal space. However with the success of root canal revascularization to regenerate the pulp dentin complex of necrotic immature tooth has made us to rethink if apexification is at the beginning of its end. The objective of this review is to discuss the new concepts of tissue engineering in endodontics and the clinical steps of root canal revascularization.

  1. Clinical management of infected root canal dentin.

    Science.gov (United States)

    Love, R M

    1996-08-01

    Several hundred different species of bacteria are present in the human intraoral environment. Bacterial penetration of root canal dentin occurs when bacteria invade the root canal system. These bacteria may constitute a reservoir from which root canal reinfection may occur during or after endodontic treatment. The learning objective of this article is to review endodontic microbiology, update readers on the role of bacteria in pulp and periapical disease, and discuss the principles of management of infected root canal dentin. Complete debridement, removal of microorganisms and affected dentin, and chemomechanical cleansing of the root canal are suggested as being the cornerstones of successful endodontic therapy, followed by intracanal medication to remove residual bacteria, when required.

  2. Type III apical transportation of root canal

    Directory of Open Access Journals (Sweden)

    Shiv P Mantri

    2012-01-01

    Full Text Available Procedural accidents leading to complications such as canal transportation have been ascribed to inapt cleaning and shaping concepts. Canal transportation is an undesirable deviation from the natural canal path. Herewith a case of apical transportation of root canal resulting in endodontic retreatment failure and its management is presented. A healthy 21-year-old young male presented discomfort and swelling associated with painful endodontically retreated maxillary incisor. Radiograph revealed periradicular radiolucency involving underfilled 11 and overfilled 12. Insufficiently obturated 11 exhibited apical transportation of canal. This type III transportation was treated by periradicular surgery and repair using white mineral trioxide aggregate (MTA. Comfortable asymptomatic patient presented uneventful healing at third and fourth month recall visits. A decrease in the size of radiolucency in radiograph supported the clinical finding. In the present case, MTA is useful in repairing the transportation defect. The result of these procedures is predictable and successful.

  3. Reproduction of intra-radicular surface anatomy of extracted human teeth: comparison of three different materials using injection technique.

    Science.gov (United States)

    Sultana, A; Rahman, M M; Rahman, M M; Shrestha, P

    2010-04-01

    This in vitro study compared the reproduction of intra-radicular surface anatomy of extracted human teeth taken by silicon, inlay casting wax and acrylic resin using an injection technique to determine which material produced fewer voids. Twenty impressions/patterns using this technique were made for each material and compared with each other on the basis of number, location and size of voids. Length of each dowel impression/ pattern was also compared. The percentage of void free surfaces using silicon, inlay casting wax and acrylic resin were 90%, 100% and 85% respectively. Most of the voids were less than 1mm in size and situated in the middle third of the impression/pattern. There was no significant difference in the length of the impression/ pattern taken by the three materials. Using the injection technique to reproduce the intra-radicular anatomy of the dowel space, all three materials will show predictably good results.

  4. MRI Findings in Spinal Canal Stenosis

    Directory of Open Access Journals (Sweden)

    Maryam Barzin

    2010-05-01

    Full Text Available Spinal canal stenosis results from progressive narrowing of the central spinal canal and the lateral recesses. Primary (congenital lumbar spinal stenosis is associated with achondroplastic dwarfism. The spinal canal may become narrowed by bulging or protrusion of the intervertebral disc annulus, herniation of the nucleus pulposus posteriorly, thickening of the posterior longitudinal ligament, hypertrophy of the facet joints, hypertrophy of the ligamentum flavum, epidural fat deposition, spondylosis of the intervertebral disc margins and uncovertebral joint hypertrophy in the neck. The central canal and the neurorecess may be compromised by tumor infiltration, such as metastatic disease, or by infectious spondylitis."nAP diameter of the normal adult cervical canal has a mean value of 17-18 mm at vertebral levels C3-5. The lower cervical canal measures 12-14 mm. Cervical stenosis is associated with an AP diameter of less than 10 mm. The thoracic spinal canal varies from 12 to 14 mm in diameter in the adult. The diameter of the normal lumbar spinal canal varies from 15 to 27 mm. Lumbar stenosis results from a spinal canal diameter of less than 12 mm in some patients; a diameter of 10 mm is definitely stenotic."nSpinal MRI is the most suitable technique for the diagnosis of spinal stenosis. The examination should be performed using thin sections (3 mm and high resolution, including the axial and sagittal planes using T1-weighted, proton-density, and T2-weighted techniques. The bony and osteophytic components are seen best using a T2-weighted gradient-echo technique."nOn MRI, findings of spinal stenosis have a variable presentation depending on the specific disease. The goal of spinal imaging is to localize the site and level of disease and to help differentiate between conditions in which patients require surgery or conservative treatment."nIn this presentation, different kinds of spinal canal stenosis and their MRI findings would be discussed.

  5. Avaliação radiográfica de obturações de canais radiculares = Radiographic evaluation of the root canal obturation

    Directory of Open Access Journals (Sweden)

    Ferreira, Hamilton Luiz Junqueira

    2007-01-01

    Full Text Available A avaliação dos resultados dos tratamentos endodônticos é parte integrante do plano de tratamento. Com isso, este trabalho teve a proposta de avaliar a imagem radiográfica das obturações endodônticas de 70 radiografias periapicais de boca completa dos pacientes encaminhados a clínica de Radiologia da Faculdade de Odontologia da Universidade Federal de Juiz de Fora-MG (UFJF. Os resultados demonstraram que, dos 217 dentes analisados, baseados nos critérios propostos por Gutmann (1992, 56,69% foram radiograficamente considerados como tratamento de sucesso

  6. Estudio prospectivo y predictivo de la sensación dolorosa posterior al tratamiento completo de conductos radiculares

    OpenAIRE

    Arias Paniagua, Ana María

    2004-01-01

    El dolor postoperatorio es relativamente frecuente tras realizar un tratamiento de conductos radiculares. El objetivo de esta tesis doctoral es determinar si existe alguna relación entre la incidencia, intensidad, tipo y duración del dolor postendodoncia y determinados factores, algunos de los cuales puede controlar el profesional y otros que no puede controlar, que son las condiciones del propio paciente y del diente a tratar. Para ello, un solo operador, especialista en endodoncia, realiza ...

  7. The association between Modic changes and pain during 1-year follow-up in patients with lumbar radicular pain

    Energy Technology Data Exchange (ETDEWEB)

    Schistad, Elina Iordanova; Roee, Cecilie [Oslo University Hospital, Department of Physical Medicine and Rehabilitation, Ullevaal, Nydalen, Postbox 4956, Oslo (Norway); University of Oslo, Faculty of Medicine, Oslo (Norway); Espeland, Ansgar [Haukeland University Hospital, Department of Radiology, Bergen (Norway); University of Bergen, Section for Radiology, Department of Clinical Medicine, Bergen (Norway); Rygh, Lars Joergen [Haukeland University Hospital, Department of Anesthesiology, Bergen (Norway); Gjerstad, Johannes [National Institute of Occupational Health, Oslo (Norway); University of Oslo, Department of Molecular Biosciences, Oslo (Norway)

    2014-09-15

    To examine whether Modic changes influence pain during a 1-year follow-up in patients with lumbar radicular pain. A total of 243 patients with lumbar radicular pain due to disc herniation were recruited from two hospitals in Norway and followed up at 6 weeks, 6 months, and 12 months. On baseline lumbar magnetic resonance images, two observers independently evaluated Modic changes (types I-III; craniocaudal size 0-3). Outcomes were sensory pain (McGill Pain Questionnaire), back and leg pain (visual analogue scale, VAS). Association between Modic type and outcomes was explored with a mixed model and then by two-way analysis of variance (ANOVA) at each time point with Modic and treatment groups (surgical, n = 126; nonsurgical, n = 117) as fixed factors, adjusted for disc degeneration, age, sex, smoking, and duration of radicular pain. Modic size was also analyzed using ANOVA. Pain scores had decreased significantly at 1-year follow-up. Modic type was significantly related to McGill sensory scores (mixed model: p = 0.014-0.026; ANOVA: p = 0.007 at 6 weeks), but not to VAS back pain or VAS leg pain scores. At 6 weeks, the mean McGill sensory score was higher in Modic I than in Modic II-III patients (p = 0.003) and in patients without Modic changes (p = 0.018). Modic size L1-S1 was not associated with pain outcomes. Patients with lumbar radicular pain have a substantial pain reduction during 1-year follow-up, but Modic type I changes may imply a slower initial decrease in sensory pain. (orig.)

  8. Estudio sobre la adaptación apical de conos maestros de gutapercha en conductos radiculares instrumentados con limas Lightspeed

    OpenAIRE

    Pumarola Suñé, José; García Campaña, Ana M.; Brau Aguadé, Esteban; Canalda Sahli, Carlos

    2000-01-01

    El objetivo de este trabajo fue establecer la coincidencia entre el calibre del cono maestro apical y la lima maestra apical, así como medir cualitativamente la adaptación de diferentes marcas de conos de gutapercha en el tercio apical de conductos radiculares instrumentados con limas Lightspeed. Se instrumentaron 100 conductos de molares naturales extraídos con el sistema Lightspeed. Las muestras se distribuyeron aleatoriamente en cinco grupos. Cada grupo fue obturado mediante condensación l...

  9. Conservative treatment in patients with an acute lumbosacral radicular syndrome: design of a randomised clinical trial [ISRCTN68857256

    Directory of Open Access Journals (Sweden)

    Peul Wilco C

    2004-11-01

    Full Text Available Abstract Background The objective is to present the design of randomised clinical trial (RCT on the effectiveness of physical therapy added to general practitioners management compared to general practitioners management only in patients with an acute lumbosacral radicular syndrome (also called sciatica. Methods/Design Patients in general practice diagnosed with an acute (less than 6 weeks lumbosacral radicular syndrome and an age above 18 years are eligible for participation. The general practitioners treatment follows their clinical guideline. The physical therapy treatment will consist of patient education and exercise therapy. The primary outcome measure is patients reported global perceived effect. Secondary outcome measures are severity of complaints, functional status, health status, fear of movement, medical consumption, sickness absence, costs and treatment preference. The follow-up is 52 weeks. Discussion Treatment by general practitioners and physical therapists in this study will be transparent and not a complete "black box". The results of this trial will contribute to the decision of the general practitioner regarding referral to physical therapy in patients with an acute lumbosacral radicular syndrome.

  10. Management of radicular cysts using platelet-rich fibrin and bioactive glass: a report of two cases.

    Science.gov (United States)

    Zhao, Jiing-Huei; Tsai, Chung-Hung; Chang, Yu-Chao

    2014-07-01

    Platelet-rich fibrin (PRF) created by Choukroun's protocol concentrates most platelets and leukocytes from a blood harvest into a single autologous fibrin biomaterial. However, no current data is available concerning the use of PRF for the treatment of periapical lesions. Two cases of radicular cysts were reported using an interdisciplinary approach, including regular endodontic therapy followed by surgical management with PRF and bioactive glass. Two cases of radicular cysts presented as an incidental radiographic finding, appearing as an apical radiolucency with well-circumscribed sclerotic borders. After regular endodontic retreatment, cystic lining/granulation tissues were enucleated and the periradicular bony defect was grafted using PRF and bioactive glass. Then, PRF was applied to serve as a membrane over the grafted defects. Recall periapical radiographs of Case 1 and cone beam computer tomography of Case 2 showed satisfactory healing of the periapical pathosis. In Case 2, the bony defect appeared completely healed at 4 months surgical reentry and the new bone was clinically very dense and mature. The results of these case reports show that the combination of PRF and bioactive glass is an effective modality of regenerative treatment for radicular cysts.

  11. Microbiología de la caries radicular en el paciente mayor Microbiology of the root caries in old patients

    Directory of Open Access Journals (Sweden)

    D Gutiérrez Acero

    2006-04-01

    Full Text Available La caries radicular es uno de los problemas bucodentales más importantes y que más comúnmente afectan al adulto mayor. La caries radicular es aquel proceso carioso que se produce sobre la raíz expuesta del diente. Los principales patógenos implicados son el Streptococcus mutans, el Actinomyces viscosus y el Lactobacillus acidofilus, que producen los ácidos orgánicos que desmineralizan el cemento y la dentina de la raíz, llegando producir su cavitación. Los cambios que se producen en el medio oral tienen una relación muy directa con las bacterias de la caries radicular y del biofilm que forman.The root caries is one of most important bucodental problems that affect to the old patient. The root caries is the decay process that produce on the expose root. The principals pathogens relying are Streptococos mutans, Actinomyces viscosus and Lactobacillus acidofilus, that produce the organics acids demineralizating of root cement and dentin producing the cavitation of the root. The changes producing in the mouth have a direct relation with the bacteria and its biofilm.

  12. Canals in Milky Way radio polarization maps

    CERN Document Server

    Fletcher, A; Fletcher, Andrew; Shukurov, Anvar

    2006-01-01

    Narrow depolarized canals are common in maps of the polarized synchrotron emission of the Milky Way. Two physical effects that can produce these canals have been identified: the presence of Faraday rotation measure ($\\RM$) gradients in a foreground screen and the cumulative cancellation of polarization known as differential Faraday rotation. We show that the behaviour of the Stokes parameters $Q$ and $U$ in the vicinity of a canal can be used to identify its origin. In the case of canals produced by a Faraday screen we demonstrate that, if the polarization angle changes by $90\\degr$ across the canal, as is observed in all fields to-date, the gradients in $\\RM$ must be discontinuous. Shocks are an obvious source of such discontinuities and we derive a relation of the expected mean separation of canals to the abundance and Mach number of supernova driven shocks, and compare this with recent observations by \\citet{Haverkorn03}. We also predict the existence of less common canals with polarization angle changes o...

  13. Panama Canal Watershed Experiment- Agua Salud Project

    Science.gov (United States)

    Stallard, Robert F.; Ogden, Fred L.; Elsenbeer, Helmut; Hall, Jefferson S.

    2010-01-01

    The Agua Salud Project utilizes the Panama Canal’s (Canal) central role in world commerce to focus global attention on the ecosystem services provided by tropical forests. The Canal was one of the great engineering projects in the world. Completed in 1914, after almost a decade of concerted effort, its 80 km length greatly shortened the voyage between the Atlantic and Pacific Oceans. An entire class of ships, the Panamax, has been constructed to maximize the amount of cargo that can be carried in a Canal passage. In today’s parlance, the Canal is a “green” operation, powered largely by water (Table 1). The locks, three pairs on each end with a net lift of 27 meters, are gravity fed. For each ton of cargo that is transferred from ocean to ocean, about 13 tons of water (m3) are used. Lake Gatún forms much of the waterway in the Canal transect. Hydroelectricity is generated at the Gatún dam, whenever there is surplus water, and at Madden Dam (completed in 1936) when water is transferred from Lake Alhajuela to Lake Gatún. The Canal watershed is the source of drinking water for Panama City and Colon City, at either end of the Canal, and numerous towns in between.

  14. Evaluation of apical deviation in root canals instrumented with K3 and ProTaper systems Avaliação do desvio apical em canais instrumentados pelos sistemas K3 e ProTaper

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    Mariana Diniz Bisi dos Santos

    2006-12-01

    Full Text Available OBJECTIVES: this study evaluated the apical deviation of curved root canals instrumented with K3 and ProTaper systems. MATERIAL AND METHODS: twenty root canals of human maxillary and mandibular first molars were employed, which were divided into 2 groups: group A (10 teeth was instrumented with the K3 system, and group B (10 teeth with the ProTaper system. Evaluation of deviation was performed by double radiographic exposure. Radiographs were achieved before and after instrumentation, with 0.3-second, thus allowing superimposition of images. Three-dimensional computerized tomograph was performed in 3 specimens in each group, as an additional means to evaluate the apical deviation. RESULTS: were evaluated by the parametric test Student-Newman-Keuls at 5%, which did not reveal significance between groups concerning the apical deviation. The results of computerized tomograph images demonstrated that the larger deviation of the root canal occurred at the distolingual area for both systems. CONCLUSIONS: both techniques produced a mild apical deviation. Computerized microtomography was shown to be accurate for experimental endodontics studies.OBJETIVOS: avaliar o desvio apical de canais radiculares curvos instrumentados pelos sistemas K3 e ProTaper. MATERIAIS E MÉTODOS: foram utilizados 20 canais radiculares de primeiros molares superiores e inferiores humanos, os quais foram divididos em 2 grupos, o grupo A (10 dentes foi instrumentado pelo sistema K3 e o grupo B (10 dentes com o sistema ProTaper, a forma de avaliação do desvio foi a dupla exposição radiográfica. As tomadas radiográficas foram feitas antes e após a instrumentação, com um tempo de 0,3 segundos em cada exposição, ocorrendo assim, sobreposição das imagens. Em 3 espécimes, de cada grupo, foi realizada a tomografia computadorizada tridimensional, como forma adicional de avaliar o desvio apical . Os resultados obtidos foram avaliados pelo teste paramétrico Student

  15. Anterior canal BPPV and apogeotropic posterior canal BPPV: two rare forms of vertical canalolithiasis.

    Science.gov (United States)

    Califano, L; Salafia, F; Mazzone, S; Melillo, M G; Califano, M

    2014-06-01

    Posterior canal benign paroxysmal positional vertigo (BPPV) is the most frequent form of BPPV. It is characterized by a paroxysmal positioning nystagmus evoked through Dix-Hallpike and Semont positioning tests. Anterior canal BPPV (AC) is more rare than posterior canal BPPV; it presents a prevalent down beating positioning nystagmus, with a torsional component clockwise for the left canal, counterclockwise for the right canal. Due to the possible lack of the torsional component, it is sometimes difficult to identify the affected ear. An apogeotropic variant of posterior BPPV (APC) has recently been described, characterised by a paroxysmal positional nystagmus in the opposite direction to the one evoked in posterior canal BPPV: the linear component is down-beating, the torsional component is clockwise for the right canal, counter-clockwise for the left canal, so that a contra-lateral anterior canal BPPV could be simulated. During a 16 month period, of 934 BPPV patients observed, the authors identified 23 (2.5%) cases of apogeotropic posterior canal BPPV and 11 (1.2%) cases of anterior canal BPPV, diagnosed using the specific oculomotor patterns described in the literature. Anterior canal BPPV was treated with the repositioning manoeuvre proposed by Yacovino, which does not require identification of the affected side, whereas apogeotropic posterior canal BPPV was treated with the Quick Liberatory Rotation manoeuvre for the typical posterior canal BPPV, since in the Dix-Hallpike position otoliths are in the same position if they come either from the ampullary arm or from the non-ampullary arm. The direct resolution of BPPV (one step therapy) was obtained in 12/34 patients, 8/23 patients with APC and 4/11 patients with AC; canalar conversion into typical posterior canal BPPV, later treated through Quick Liberatory Rotation (two-step therapy), was obtained in 19 patients,14/23 with APC and 5/11 with AC. Three patients were lost to follow-up. Considering the effects of

  16. Inner Harbor Navigation Canal Basin Velocity Analysis

    Science.gov (United States)

    2014-10-01

    ER D C/ CH L TR -1 4- 12 Inner Harbor Navigation Canal Basin Velocity Analysis Co as ta l a nd H yd ra ul ic s La bo ra to ry...library at http://acwc.sdp.sirsi.net/client/default. ERDC/CHL TR-14-12 October 2014 Inner Harbor Navigation Canal Basin Velocity Analysis...system of levees, gates, and drainage structures in the Inner Harbor Navigation Canal (IHNC) basin and the greater New Orleans, Louisiana, area. Two

  17. Comparison of the efficacy of transforaminal and interlaminar radicular block techniques for treating lumbar disk hernia

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    Rodrigo Rezende

    2015-04-01

    Full Text Available OBJECTIVE: To compare the interlaminar and transforaminal block techniques with regard to the state of pain and presence or absence of complications.METHOD: This was a randomized double-blind prospective study of descriptive and comparative nature, on 40 patients of both sexes who presented lumbar sciatic pain due to central-lateral or foraminal disk hernias. The patients had failed to respond to 20 physiotherapy sessions, but did not present instability, as diagnosed in dynamic radiographic examinations. The type of block to be used was determined by means of a draw: transforaminal (group 1; 20 patients or interlaminar (group 2; 20 patients.RESULTS: Forty patients were evaluated (17 males, with a mean age of 49 years. There was a significant improvement in the state of pain in all patients who underwent radicular block using both techniques, although the transforaminal technique presented better results than the interlaminar technique.CONCLUSION: Both techniques were effective for pain relief and presented low complication rates, but the transforaminal technique was more effective than the interlaminar technique.

  18. Microtensile Bond Strength of Translucent Glass Fiber Posts to Intra-radicular Dentin

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    N. Mohammadi

    2009-03-01

    Full Text Available Objective: The aim of the present study was to compare microtensile bond strengths (μTBS of glass fiber posts to different parts of intra-radicular dentin using conventional method and one-shot technique under different light intensities.Materials and Methods: Twenty-eight single-rooted teeth were prepared to receive fiber posts: Group 1: Conventional method at light intensity of 600 mW/cm2; Groups 2, 3 and 4:One-shot technique at light intensities of 600, 800 and 1000 mW/cm2 respectively. Dumbbell-shaped slices were obtained from the samples and submitted to micro-tensile testing.The data were analyzed using two-way ANOVA and paired-samples t-test.Results: There were no significant differences in μTBS values of the cervical and middle thirds between the groups (P>0.05. μTBS values in the cervical thirds in groups 2 and 3 were significantly higher than those in the middle thirds (P>0.05. However, there were nosuch differences in groups 1 and 4 (P>0.05.Conclusion: It is proper to simultaneously cure the resin cement and the adhesive agent (one-shot technique; however, in that case, high light intensities (1000 mW/cm2 are recommended to achieve identical bond strength values in the cervical and middle thirds.

  19. Radiofrequency for the Treatment of Lumbar Radicular Pain: Impact on Surgical Indications

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    José Manuel Trinidad

    2015-01-01

    Full Text Available Study Design. Quasiexperimental study. Objective. To investigate whether radiofrequency treatment can preclude the need for spinal surgery in both the short term and long term. Background. Radiofrequency is commonly used to treat lumbosacral radicular pain. Only few studies have evaluated its effects on surgical indications. Methods. We conducted a quasiexperimental study of 43 patients who had been scheduled for spinal surgery. Radiofrequency was indicated for 25 patients. The primary endpoint was the decision of the patient to reject spinal surgery 1 month and 1 year after treatment (pulsed radiofrequency of dorsal root ganglion, 76%; conventional radiofrequency of the medial branch, 12%; combined technique, 12%. The primary endpoint was the decision of the patient to reject spinal surgery 1 month and 1 year after treatment. In addition, we also evaluated adverse effects, ODI, NRS. Results. We observed after treatment with radiofrequency 80% of patients rejected spinal surgery in the short term and 76% in the long term. We conclude that radiofrequency is a useful treatment strategy that can achieve very similar outcomes to spinal surgery. Patients also reported a very high level of satisfaction (84% satisfied/very satisfied. We also found that optimization of the electrical parameters of the radiofrequency improved the outcome of this technique.

  20. DESENVOLVIMENTO REGIONAL SOB O ENFOQUE PÓS-KEYNESIANO

    OpenAIRE

    Julia Elizabete Barden

    2007-01-01

    Este trabalho tem como objetivo fazer uma revisão bibliográfica acerca de estudosque analisam o desenvolvimento regional sob a perspectiva da teoria pós-keynesiana. Osresultados destes demonstram que o sistema financeiro, em especial os bancos,influenciam no grau de desenvolvimento das regiões, sobretudo, porque o comportamentodestes agentes segue um conceito importante utilizado pela teoria, a preferência pelaliquidez. Assim, a disponibilidade de crédito para investimento no sistema produtiv...

  1. Ligadura videotoracoscópica da persistência do canal arterial

    Directory of Open Access Journals (Sweden)

    SOUTO Gladyston Luiz de Lima

    2000-01-01

    Full Text Available OBJETIVO: Demonstrar a técnica de fechamento da Persistência do Canal Arterial (PCA, destacando a simplicidade e singularidade do método. CASUÍSTICA E MÉTODO: No período de março de 1994 a novembro de 1999, 40 pacientes (pac, com idade entre 8 meses e 17 anos e predominando o sexo masculino, foram submetidos a operação de fechamento da PCA através de videotoracoscopia. O paciente é colocado em decúbito lateral direito, sob anestesia geral com intubação seletiva do pulmão direito. São usados quatro trocateres: um de 3 mm no 3º espaço intercostal (EIC esquerdo na linha axilar anterior e outro trocater de 5 mm no 3º (EICE na linha axilar média. A ótica 30 graus infantil é introduzida em um trocater de 3 mm no 5º EICE na linha axilar posterior e outro trocater de 5 mm no 5º EICE na linha axila anterior. A identificação do canal é feita tendo como parâmetro anatômico os nervos frênico e vago. Após o isolamento, o canal é duplamente clipado ou ligado com fio de algodão grosso com nó interno. Terminado o procedimento, o pulmão é expandido sob visão direta, não havendo necessidade de drenar o tórax. RESULTADOS: Obtivemos sucesso inicial em 37 pac (92,5%, sendo necessária reversão para operação convencional em 3 pac (7,5%. Não houve óbito nem complicações e o tempo médio de hospitalização foi de 48 horas. CONCLUSÃO: Acreditamos ser o procedimento eficaz, seguro, com pequeno índice de complicações, custo baixo e uma curva de aprendizado também pequena.

  2. Boolean nested canalizing functions: a comprehensive analysis

    CERN Document Server

    Li, Yuan; Murrugarra, David; Aguilar, Boris; Laubenbacher, Reinhard

    2012-01-01

    Boolean network models of molecular regulatory networks have been used successfully in computational systems biology. The Boolean functions that appear in published models tend to have special properties, in particular the property of being nested canalizing, a property inspired by the concept of canalization in evolutionary biology. It has been shown that networks comprised of nested canalizing functions have dynamic properties that make them suitable for modeling molecular regulatory networks, namely a small number of (large) attractors, as well as relatively short limit cycles. This paper contains a detailed analysis of this class of functions, based on a novel normal form as polynomial functions over the Boolean field. The concept of layer is introduced that stratifies variables into different classes depending on their level of dominance. Using this layer concept a closed form formula is derived for the number of nested canalizing functions with a given number of variables. Additional metrics analyzed in...

  3. Two root canals in maxillary central incisor

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    Fábio de Almeida Gomes

    2011-07-01

    Full Text Available Introduction and objective: The success of endodontic treatment requires the knowledge of tooth morphology and its variations. Case report: This clinical article reports an unusual root canal configuration that was detected in a maxillary central incisor with two root canals, demonstrated by radiographic and computerized tomography exams. Conclusion: Knowledge of endodontic anatomy as well as the obtainment of both preoperative radiographs and tomography is important to detect abnormal tooth morphology.

  4. Fractura patológica de la mandíbula asociada a quiste radicular: Reporte de 3 casos clínicos Mandibular pathologic fracture associated with radicular cyst: Report of three clinical cases

    Directory of Open Access Journals (Sweden)

    J. Bouguila

    2008-08-01

    Full Text Available Introducción. El quiste radicular es el quiste más común de los maxilares. Su tamaño puede variar desde una lesión que abarca el proceso alveolar hasta uno extenso que oblitera el espacio antral maxilar o causa una fractura patológica mandibular. Reporte de casos. Se reportan tres casos con fractura patológica mandibular asociados a quiste radicular ocurridos después de trauma facial. El diagnóstico fue sugerido por un estudio clínico, radiografía panorámica y confirmado por el estudio histopatológico de la pieza operatoria. El tratamiento consistió en enucleación quística seguido por inmovilización de fragmentos con osteosíntesis o bloqueo intermaxilar. El resultado clínico y radiológico a corto plazo fue favorable. Discusión. Se discuten aspectos propios de la patología y su terapia. Conclusión. El éxito del tratamiento depende de una adecuada terapia en que sus principios más importantes son la remoción de la lesión mediante enucleación y una fijación estable.Introduction. Radicular cyst is the most common cyst of the oral cavity. It may range in size from a small periapical lesion to one that can obliterate the antral space or cause mandibular fracture. Case reports. We report three cases of radicular cyst complicated by mandibular fracture that occurred after maxillofacial trauma. The diagnosis was strongly suggested by panoramic radiography and confirmed by pathology examination of the operative specimen. Treatment consisted in cyst enucleation followed by immobilization of fragments by osteosynthesis or maxillomandibular fixation. The clinical and radiologic outcome was favorable. Discussion. The particularities and treatment are discussed. Conclusion. Treatment success is dependent on adequate therapy, the principles of which are removing the lesion and providing stable fixation.

  5. The fluid mechanics of root canal irrigation.

    Science.gov (United States)

    Gulabivala, K; Ng, Y-L; Gilbertson, M; Eames, I

    2010-12-01

    Root canal treatment is a common dental operation aimed at removing the contents of the geometrically complex canal chambers within teeth; its purpose is to remove diseased or infected tissue. The complex chamber is first enlarged and shaped by instruments to a size sufficient to deliver antibacterial fluids. These irrigants help to dissolve dying tissue, disinfect the canal walls and space and flush out debris. The effectiveness of the procedure is limited by access to the canal terminus. Endodontic research is focused on finding the instruments and clinical procedures that might improve success rates by more effectively reaching the apical anatomy. The individual factors affecting treatment outcome have not been unequivocally deciphered, partly because of the difficulty in isolating them and in making the link between simplified, general experimental models and the complex biological objects that are teeth. Explicitly considering the physical processes within the root canal can contribute to the resolution of these problems. The central problem is one of fluid motion in a confined geometry, which makes the dispersion and mixing of irrigant more difficult because of the absence of turbulence over much of the canal volume. The effects of treatments can be understood through the use of scale models, mathematical modelling and numerical computations. A particular concern in treatment is that caustic irrigant may penetrate beyond the root canal, causing chemical damage to the jawbone. In fact, a stagnation plane exists beyond the needle tip, which the irrigant cannot penetrate. The goal is therefore to shift the stagnation plane apically to be coincident with the canal terminus without extending beyond it. Needle design may solve some of the problems but the best design for irrigant penetration conflicts with that for optimal removal of the bacterial biofilm from the canal wall. Both irrigant penetration and biofilm removal may be improved through canal fluid

  6. A case report of a patient with upper extremity symptoms: differentiating radicular and referred pain

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    Daub Clifford W

    2007-07-01

    Full Text Available Abstract Background Similar upper extremity symptoms can present with varied physiologic etiologies. However, due to the multifaceted nature of musculoskeletal conditions, a definitive diagnosis using physical examination and advanced testing is not always possible. This report discusses the diagnosis and case management of a patient with two episodes of similar upper extremity symptoms of different etiologies. Case Presentation On two separate occasions a forty-four year old female patient presented to a chiropractic office with a chief complaint of insidious right-sided upper extremity symptoms. During each episode she reported similar pain and parasthesias from her neck and shoulder to her lateral forearm and hand. During the first episode the patient was diagnosed with a cervical radiculopathy. Conservative treatment, including manual cervical traction, spinal manipulation and neuromobilization, was initiated and resolved the symptoms. Approximately eighteen months later the patient again experienced a severe acute flare-up of the upper extremity symptoms. Although the subjective complaint was similar, it was determined that the pain generator of this episode was an active trigger point of the infraspinatus muscle. A diagnosis of myofascial referred pain was made and a protocol of manual trigger point therapy and functional postural rehabilitative exercises improved the condition. Conclusion In this case a thorough physical evaluation was able to differentiate between radicular and referred pain. By accurately identifying the pain generating structures, the appropriate rehabilitative protocol was prescribed and led to a successful outcome for each condition. Conservative manual therapy and rehabilitative exercises may be an effective treatment for certain cases of cervical radiculopathy and myofascial referred pain.

  7. Fotossíntese, reservas orgânicas e rebrota do capim-mombaça (Panicum maximum Jacq.sob diferentes intensidades de desfolha do perfilho principal

    Directory of Open Access Journals (Sweden)

    Gomide Carlos Augusto de Miranda

    2002-01-01

    Full Text Available Buscando-se avaliar morfofisiologicamente a rebrota do capim-mombaça, quatro desfolhas foram impostas ao perfilho principal, sendo estudado o comportamento da planta em termos da taxa de expansão da área foliar, crescimento do sistema radicular, nível de carboidratos totais não estruturais (CTNE da raiz e do colmo, taxa de crescimento relativo (TCR, taxa de assimilação líquida (TAL e razão de área foliar (RAF às idades de 2, 5, 9 e 16 dias após as desfolhas, bem como da taxa fotossintética máxima às idades de 2, 6 e 13 dias das folhas remanescentes à desfolha. As desfolhas foram as seguintes: remoção de todas as lâminas foliares (desfolha total, a remoção da lâmina da folha adulta mais jovem (desfolha superior, a remoção das lâminas das duas folhas adultas mais velhas (desfolha inferior e controle (sem desfolha, juntamente com o corte dos demais perfilhos, realizado a 8 cm do solo. Foram observadas cinco repetições por tratamento, segundo o delineamento inteiramente casualizado. As folhas adultas não diferiram quanto às taxas fotossintéticas máximas, que exibiram aumento nos primeiros dias após a desfolha, e queda aos 13 dias. A desfolha reduziu os teores de CTNE da base do colmo, principalmente nas plantas sob desfolha total. Comprometimento do crescimento do sistema radicular e do teor de CTNE das raízes foi observado nas plantas sob desfolha total, que também tiveram sua TCR reduzida nos primeiros dias de rebrotação. Entretanto, o aumento na RAF possibilitou a estas plantas recuperação da TCR e alta taxa de expansão da área foliar, igualando a área foliar das demais plantas aos 16 dias de rebrota.

  8. Penetração intratubular de cimentos endodônticos Intratubular penetration of root canal sealers

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    Gustavo de Deus

    2002-12-01

    Full Text Available Este estudo foi desenvolvido para avaliar a capacidade de penetração de diferentes cimentos endodônticos (Endo Fill, Sealapex, AH Plus e Pulp Canal Sealer nos túbulos dentinários em dentes devidamente modelados e obturados. Foram utilizados 72 incisivos centrais superiores, os quais foram instrumentados no sentido coroa-ápice pela técnica de forças balanceadas. O comprimento de trabalho foi estabelecido a 1 mm do ápice radicular. Durante a limpeza e modelagem, todos os dentes foram irrigados com 10 ml de hipoclorito de sódio a 5,25%. Os dentes foram divididos em 4 grupos, sendo 1 para cada tipo de cimento. Estes grupos foram então subdivididos em função do uso ou não de EDTA a 17% previamente à obturação dos canais radiculares, para a remoção da lama dentinária. Todos os dentes foram obturados pela técnica da onda de condensação com cone médio calibrado. Após obturação, as raízes foram seccionadas no sentido mésio-distal e foi escolhida a secção de melhor qualidade visual. Estas foram então analisadas em microscopia eletrônica de varredura (MEV, sendo o foco de observação sempre a interface dentina/material obturador. Após obtenção das imagens, mensurou-se os prolongamentos dos cimentos para o interior dos túbulos dentinários. O cimento de Rickert (Pulp Canal Sealer apresentou a maior capacidade de penetração nos túbulos dentinários, sendo os piores resultados apresentados pelo grupo em que se utilizou o Sealapex. Os resultados foram avaliados estatisticamente pelo teste de Spearman, o qual mostrou diferença estatisticamente significante (p The purpose of this study was to evaluate the capacity of penetration of four endodontic sealers (Endo Fill, Sealapex, AH Plus and Pulp Canal Sealer into dentinal tubules. Seventy-two extracted human maxillary anterior teeth were utilized in this study. The teeth were cleaned and shaped by means of the balanced-forces technique. The work length was established at 1

  9. Posterior semicircular canal dehiscence: a morphologic cause of vertigo similar to superior semicircular canal dehiscence

    Energy Technology Data Exchange (ETDEWEB)

    Krombach, G.A.; Schmitz-Rode, T.; Haage, P.; Guenther, R.W. [Department of Diagnostic Radiology, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany); DiMartino, E. [Department of Otorhinolaryngology, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany); Prescher, A. [Department of Anatomy, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany); Kinzel, S. [Department of Experimental Veterinarian Medicine, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany)

    2003-06-01

    Heading Abstract.The aim of this study was to assess imaging findings of posterior semicircular dehiscence on computed tomography and to evaluate incidence of posterior and superior semicircular canal dehiscence in patients presenting with vertigo, sensorineuronal hearing loss or in a control group without symptoms related to the inner ear. Computed tomography was performed in 507 patients presenting either with vertigo (n=128; 23 of these patients suffered also from sensorineuronal hearing loss), other symptoms related to the inner ear, such as hearing loss or tinnitus (n=183) or symptoms unrelated to the labyrinth (n=196). All images were reviewed for presence of dehiscence of the bone, overlying the semicircular canals. Twenty-nine patients had superior semicircular canal dehiscence. Of these patients, 83% presented with vertigo, 10% with hearing loss or tinnitus and the remaining 7% with symptoms unrelated to the inner ear. In 23 patients dehiscence of the posterior semicircular canal was encountered. Of these patients, 86% presented with vertigo, 9% with hearing loss or tinnitus and 5% with symptoms unrelated to the inner ear. Defects of the bony overly are found at the posterior semicircular canal, in addition to the recently introduced superior canal dehiscence syndrome. Significant prevalence of vertigo in these patients suggests that posterior semicircular canal dehiscence can cause vertigo, similar to superior semicircular canal dehiscence. (orig.)

  10. Effects of neural mobilization on pain, straight leg raise test and disability in patients with radicular low back pain

    Directory of Open Access Journals (Sweden)

    Haris Čolaković

    2013-09-01

    Full Text Available Introduction: Radicular low back pain is a disorder involving the dysfunction of the lumbosacral nerve roots. Clinical rehabilitation approaches for low back pain include kinesiotherapy, and physical therapyprocedures: ice , rest , heat, ultrasound, TENS, but evidences regarding their effectiveness are lacking. The purpose of this study was to determine if nerve mobilization brings better improvements in pain, SLR testand functional disability in patients with radicular low back pain compared to standard physical therapy.Methods: The study was conducted on a 60 patients with Radicular low back pain, treated in Regional medical center "Dr Safet Mujić", Mostar, during the period from 01.04.2010 untill 31.04.2011. Patientswere divided into two groups. First group (n=30 received a 4-week rehabilitation program including neural mobilization and lumbar stabilization program. Second group (n=30 received a 4-week rehabilitation program including active range of motion (ROM exercises and lumbar stabilization program.Results: At the beginning, the two groups were not signifi cantly different in terms of score or SLR. After therapy there was statistically signifi cant improvement between groups in both VAS scores[Group A: 1.16±1.5; Group B: 2.25±2.2] and SLR [Group A: 80.9±17.4; Group B: 65.9±16.4]. ]. After the treatment, in group A, 46.6% (14 participants had been rated with 4, but in Group B: 33.3% (10 participants had been rated with 3.Conclusions: Patients treated with neural mobilization and lumbar stabilization showed better VAS scores and Straight Leg Test scores compared to patients treated with active range of motion exercises and lumbar stabilization. Further research to investigate their long term effi cacy is warranted, with emphasis on greater number of participants.

  11. An in vitro model to investigate filling of lateral canals.

    Science.gov (United States)

    Venturi, Mauro; Di Lenarda, Roberto; Prati, Carlo; Breschi, Lorenzo

    2005-12-01

    Aims of this work were to examine lateral canals in extracted teeth, to propose a new technique to produce artificial lateral canals, and to compare two obturation techniques. Cleared roots were examined to record measure and shape of lateral canals. Artificial lateral canals were prepared on human demineralized teeth before final clearing. Specimens were divided in two groups: canals of group 1 were filled with Schilder's technique, canals of group 2 were filled with vertical compaction with apical backfilling. Stereomicroscopic analysis of lateral canal filling revealed lower filling rates in apical canals compared to coronal ones and higher filling rates with "vertical compaction with apical backfilling" compared to Schilder's group. The tested procedure appears to be a reliable technique to obtain standardized lateral canals and to compare filling procedures.

  12. A radiographic study of mandibular canal

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Won Chul; Lee, Sang Rae [Dept. of Oral Radiology, Division of Dentistry, Kyung Hee University, Seoul (Korea, Republic of)

    1987-11-15

    The author invested the gonial angle, the angle of mandibular and mental canal to the lower border of the mandible, and a relationship of the position of the mandibular canal to the root apex of the posterior teeth and the cortical plate of the lower of the mandible. The materials consisted of 458 pantomograms in male and female aged 11-40 and divided into 5 groups at year intervals and subdivided into 3 groups by gonial angle. The results were as follows: 1. The gonial angle decreased with age, but slight increase occurred over 26-30 years. 2. The average angle of the mandibular canal to the lower border of the mandible was 151.6 degree and did not correlate with age. 3. The average angle of the mental canal to the lower border of the mandible was 36.9 degree and didn't correlate with age. 4. The angles of mandibular and mental canal to the lower border of mandible correlated with gonial angle. 5. The distance from the root apex of the posterior teeth to the upper wall mandibular canal was most short at the region of the distal root of the mandibular second and increased with age at the region of the mandibular second molar. 6. The distance from the lower wall of the mandibular canal to the cortical plate of the lower border of the mandibule was most short at the region of the mesial root of the mandibular first molar and didn't correlate with age.

  13. NUTRIÇÃO MINERAL DE PIMENTA ORNAMENTAL SOB DEFICIÊNCIAS NUTRICIONAIS

    Directory of Open Access Journals (Sweden)

    COELHO, V. A. T.

    2014-04-01

    ção de Hoagland; Arnon (1950. Os tratamentos foram: solução nutritiva completa (controle e soluções nutritivas com omissões individuais de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn e Zn. Após a germinação, as mudas foram transferidas para a solução nutritiva completa com 10% da sua força iônica (período de adaptação, as quais permaneceram sob aeração constante. Após a adaptação, as plantas foram selecionadas quanto à uniformidade de tamanho da parte aérea e raízes e transplantadas para vasos de plástico (um litro com solução nutritiva a 100%, nos quais foram estabelecidos os tratamentos. A colheita das plantas foi realizada aos XX dias de cultivo, sendo, então, o material seco e pesado para a obtenção da massa de matéria seca. Após a secagem, procedeu-se também à moagem para posterior análise química. As plantas cultivadas sob omissões de N, P, K, Ca, Mg, S e B são as mais afetadas com relação à altura comparando-as as plantas dos demais tratamentos. As menores produções de massa de matéria seca da parte aérea são obtidas em plantas de pimenta cultivadas sob omissões de N, K e P. As omissões nutricionais que mais restringem o crescimento do sistema radicular de plantas de pimenta ornamental são K, B e N. Os teores de P, K, Ca, Mg e S encontrados na parte aérea de pimenta ornamental no tratamento completo são 2,53; 28,20; 10,67; 3,88 e 7,93 g kg-1, respectivamente. A ordem decrescente de acúmulo de macronutrientes na parte aérea da pimenta ornamental em solução nutritiva é K>Ca>S>Mg>P.

  14. Cobertura radicular obtenida tras el tratamiento de recesiones gingivales: estudio retrospectivo de dos técnicas quirúrgicas

    OpenAIRE

    2016-01-01

    124 p. Los diferentes estudios epidemiológicos realizados sobre la enfermedad periodontal en seres humanos han demostrado la gran prevalencia de las recesiones gingivales, lo que hace que sean motivo de demanda de tratamiento. A lo largo de la historia se han descrito numerosas técnicas de cirugía mucogingival cuyo objetivo es la cobertura radicular, pero la evidencia científica demuestra que las técnicas de tratamiento para conseguir una mayor predictibilidad en cuanto a cobertura y mejor...

  15. Efectos de las fuerzas ortodóncicas, producidas por brackets autoligantes activos y pasivos, sobre el cemento radicular.

    OpenAIRE

    Pavani Carillo, Jorge José

    2016-01-01

    Introducción: El objetivo de este trabajo, de carácter clínico experimental, fue observar in vitro, mediante la utilización de distintos tipos de microscopios y del estudio microanalítico, los posibles cambios estructurales y químicos del cemento radicular, producidos por el efecto de las fuerzas ortodóncicas generadas al emplear brackets autoligantes activos y pasivos, luego del período de alineación, nivelación y expresión inicial de torque del tratamiento ortodóncico. Materiales ...

  16. Tratamiento endodóncico de una lesión periapical causante de separación radicular

    OpenAIRE

    1990-01-01

    Se presenta un caso de lesión periapical de tamaño considerable que produjo una separación manifiesta de las raíces de dos incisivos inferiores. Se practicó un tratamiento de conductos radiculares, con sobreobturación de hidróxido de calcio. El control clínico y radiográfico a los dos años muestra una reparación total del periápice.

  17. Quinta parte. pudriciones fungosas radiculares del fríjol en valle de medellín colombia

    OpenAIRE

    Cárdona Álvarez Canúto

    2013-01-01

    En esta parte se hace el resumen del estudio que se realizo sobre las pudriciones fungosas radiculares del fríjol en el valle de Medellín, a continuación se enumeran las conclusiones a las que se llegaron: 1)A partir de 1948 se hizo un estudio de determinación de los hongos que causan pudriciones de la raíz del fríjol. Dicho estudio se efectuó en Medellín e incluyó organismos de la región y de otros lugares, como Andes, Armero y Palmira. Se usaron organismos que se encontraron asociados ...

  18. Estudo clínico da eficácia do bloqueio anestésico radicular transforaminal no tratamento da radiculopatia lombar Estudio clínico de la eficacia del bloqueo anestésico radicular transforaminal en el tratamiento de la radiculopatía lumbar Clinical study on the efficacy of transforaminal radicular block in lumbar radiculopathy treatment

    Directory of Open Access Journals (Sweden)

    Fabiano Fonseca Rodrigues de Souza

    2011-01-01

    Full Text Available OBJETIVO: O objetivo deste estudo é avaliar a eficácia da injeção transforaminal nos pacientes com dor radicular devido à hérnia de disco ou estenose foraminal lombar por meio de estudo prospectivo randomizado. MÉTODOS: Foram avaliados 61 pacientes com quadro de radiculopatia nos membros inferiores. Esses pacientes foram divididos em dois grupos escolhidos aleatoriamente. Desses, 32 foram submetidos à injeção de corticosteroides e 29 foram submetidos à injeção salina. O período de acompanhamento foi de 12 meses. Para avaliar os resultados aplicamos a Escala Analógica Visual de Dor (EAV e o Índice Oswestry (ODI. RESULTADOS: Houve melhora significativa da intensidade de dor (p OBJETIVO: El presente estudio tuvo como objetivo evaluar la eficacia de la inyección transforaminal en pacientes con dolor radicular, debido a la hernia discal lumbar o estenosis foraminal, mediante un estudio prospectivo y aleatorizado. MÉTODOS: Se analizó un total de 61 pacientes con cuadro de radiculopatía en miembros inferiores. Estos pacientes fueron divididos en dos grupos seleccionados al azar. De ellos, 31 fueron sometidos a inyecciones de corticoides y a 29 se les aplicaron inyecciones de suero fisiológico. El período de seguimiento fue de 12 meses. Para evaluar los resultados se les aplicó la Escala Visual Analógica del dolor (EAV y el Índice de Oswestry (ODI, sigla en inglés. RESULTADOS: Hubo una mejora significativa en la intensidad del dolor (p OBJECTIVE: To assess the efficacy of corticosteroid injections in patients with sciatica due to lumbar disc herniation or lumbar foraminal stenosis by a prospective randomized study. METHODS: There were analyzed 61 patients with sciatica due to lumbar disc degeneration. These patients were divided into two groups randomly chosen to radicular blocks with saline solution or corticosteroids. Thirty-one of these patients were submitted to corticosteroids radicular block and 29 patients were submitted

  19. Efeito da compactação do solo no desenvolvimento aéreo e radicular de cultivares de milho

    Directory of Open Access Journals (Sweden)

    Foloni José Salvador Simoneti

    2003-01-01

    Full Text Available O objetivo deste trabalho foi avaliar o desenvolvimento aéreo e radicular de duas cultivares de milho (Zea mays L., em solo submetido a quatro níveis de compactação. Utilizou-se um Latossolo Vermelho-Escuro distroférrico de textura média, em vasos montados com anéis de PVC sobrepostos, com diâmetro interno de 14,5 cm e altura de 35 cm. Os níveis de compactação utilizados em subsuperfície foram caracterizados pelas densidades do solo de 1,28, 1,42, 1,56 e 1,69 Mg m³. As cultivares de milho foram o híbrido AG-5011 e a variedade Sol da Manhã. Aos 40 dias após a emergência das plantas, determinaram-se as massas da matéria seca da parte aérea e das raízes, a densidade do comprimento radicular e o diâmetro médio radicular. A compactação do solo comprometeu o desenvolvimento das plantas de milho híbrido e da variedade na mesma intensidade. Apesar de alterar a distribuição do sistema radicular ao longo do perfil do solo, o impedimento físico em subsuperfície não diminuiu a produção total de raízes de milho. O diâmetro médio radicular apresentou alta correlação com o crescimento de raízes no solo compactado. O sistema radicular do milho não é capaz de romper uma camada compactada de solo com resistência mecânica da ordem de 1,4 MPa.

  20. Efeito em longo prazo da aplicação de etanol na resistência adesiva de pinos de fibra de vidro cimentados à dentina radicular = Long-term effect of ethanol on the bond strength of fiber-glass posts to root dentin

    Directory of Open Access Journals (Sweden)

    Bordin, Dimorvan

    2014-01-01

    Full Text Available Objetivo: Avaliar o efeito em longo prazo da aplicação de etanol (EtOH na resistência adesiva de sistemas adesivos utilizados na cimentação de pinos à dentina radicular. Métodos: Raízes bovinas (n=40 tiveram o canal radicular preparado para receber pino, sendo realizado o condicionamento com ácido fosfórico 37% (15 s. Os espécimes foram distribuídos de acordo o sistema adesivo e aplicação de EtOH. Grupos controles receberam apenas aplicação dos adesivos Adper ScothBond Multi-Purpose Plus (ASb, ou Adper Single Bond (SB. Grupos experimentais receberam aplicação prévia de EtOH durante 1 minuto (EtOH+ASb e EtOH+SB. Após a cimentação, os espécimes, foram armazenados por 24 h, ou 12 meses, sendo submetidos ao teste push out (n=5. Os dados foram avaliados estatisticamente por análise de variância a 3 critérios e teste Tukey (a0,05. Após 12 meses, observou-se redução estatisticamente significante da resistência adesiva (p0,05. Conclusão: O pré-tratamento com EtOH contribui para manutenção da resistência de união em longo prazo, quando utilizado sistema adesivo a base de água e etanol

  1. The Kra Canal and Southeast Asian Relations

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    Rini Suryati Sulong

    2012-01-01

    Full Text Available This paper is a conceptual study that attempts to analyse the possible effects of the development of the Kra Isthmus Canal on ASEAN relations. The Kra Canal would constitute a mega-project, a passageway that would connect the Andaman Sea and the Gulf of Thailand at the Isthmus of Kra, Thailand. Although the proposed Kra Canal is projected to provide many economic and trade benefits to Thailand, and to the region as a whole, steps toward its development have yet to be taken. There has been much debate over the costs for trade, the costs for the environment, national and regional security concerns, as well as major concerns related to political and economic relations in the region. Therefore, one of the main purposes of this study is to contribute to the debate on the possible impact of the devel-opment of the Kra Canal on ASEAN’s regional relations. In particular, it proposes that the development of the Kra Canal could threaten regional solidarity as it would physically divide maritime Southeast Asia from main-land Southeast Asia, which would ultimately result in an economic, cultural and political divide of ASEAN itself.

  2. Consideraciones restauradoras y periodontales de molares tratados con resección radicular Restoration and periodontal considerations of resectioned molar teeth

    OpenAIRE

    J.C. Cuartas Ramírez; C.M. Ardila Medina

    2010-01-01

    La restauración de molares sometidos a resección radicular debe realizarse cuidadosa y apropiadamente. Los problemas que pueden aparecer cuando la terapia restauradora no es llevada a cabo adecuadamente incluyen problemas de retención, excesiva debilidad de la estructura radicular e incompleto sellado marginal. La cirugía preprotésica es una fase importante de este proceso y aun cuando la reparación tisular ocurre 6 u 8 semanas después del corte, se pueden evaluar diferentes tipos de restaura...

  3. RESISTÊNCIA À FRATURA DE DENTES COM DIFERENTES GRAUS DE FRAGILIZAÇÃO RADICULAR RECONSTRUÍDOS COM OU SEM PINOS ACESSÓRIOS

    OpenAIRE

    Ricardo Abreu da Rosa

    2010-01-01

    No presente trabalho foi avaliada a resistência à fratura de dentes bovinos com diferentes graus de alargamento do conduto radicular e reconstruídos com pinos de fibra de vidro utilizados isoladamente ou associados a pinos acessórios de fibra de vidro. Foram selecionados 50 incisivos inferiores bovinos, de dimensões mésio-distal e vestíbulo-lingual similares, seccionados transversalmente a 14 mm do ápice radicular. O tecido pulpar foi removido e os dentes foram fixados em blocos de resina acr...

  4. Influência do operador e agente cimentante na resistência de união de pinos de fibra de vidro à dentina radicular

    OpenAIRE

    Giovana Mongruel Gomes

    2010-01-01

    O propósito desse estudo foi avaliar a influência do operador e do sistema de cimentação na resistência de união (RU) de pino de fibra de vidro à dentina radicular nos diferentes terços radiculares. Quarenta e oito incisivos centrais superiores humanos extraídos foram seccionados transversalmente imediatamente após a junção cemento-esmalte, e as raízes foram tratadas endodonticamente. Após uma semana, foi realizado o preparo padronizado dos condutos, e as raízes foram aleatoriamente ...

  5. Reabsorción radicular de incisivos centrales por impactación de caninos. Una solución ortodóncica

    OpenAIRE

    Tuesta Da Cruz, Orlando; Facultad de Estomatología, Universidad Peruana Cayetano Heredia. Lima,

    2014-01-01

    La impactación del canino superior permanente es un problema clínico que puede provocar una serie de secuelas que van desde la pérdida de espacio en el arco para su correcta erupción, hasta la reabsorción radicular de dientes vecinos. En el presente reporte se describe el caso de un paciente con ausencia clínica de caninos superiores, que se encontraban impactados con las coronas orientadas hacia vestibular y las raíces hacia palatino, produciendo reabsorción de 2/3 radiculares de los incisiv...

  6. Tesis doctoral: Influencia de la anatomía topográfica en la desinfección de conductos radiculares

    OpenAIRE

    Spoleti, Pablo

    2008-01-01

    Remover todo tejido orgánico, sano, inflamado o contaminado del sistema de conductos radiculares y su desinfección, es uno de los pilares básicos en Endodoncia. El objetivo de este estudio fue analizar la influencia de la anatomía topográfica en la desinfección del sistema de conductos radiculares. Para ello se seleccionó una muestra representativa de 120 dientes con diagnóstico de vitalidad pulpar y de diferente anatomía interna: incisivos centrales superiores, caninos superiores y raíces di...

  7. Synchronous rectal adenocarcinoma and anal canal adenocarcinoma

    Institute of Scientific and Technical Information of China (English)

    GU Jin; LI Jiyou; YAO Yunfeng; LU Aiping; WANG Hongyi

    2007-01-01

    It is difficult to distinguish a tectal carcinoma with anal metastases from coexistent synchronous anorectal carcinomas.The therapeutic strategy for rectal and anal carcinoma is so different that it should be clearly identified.Here,we report on the case of a 63-year-old man who presented with an upper-third rectal adenocarcinoma.Five months after resection,he developed an adenocarcinoma in the anal canal.The histological slides of both tumors were reviewed and immunohistochemical studies for cytokeratins(CKs)7 and 20 were performed.The index tumor demonstrated CK 7-/CK 20+and the second showed CK7+/CK20+.For this reason,we believe the present case had synchronous adenocarcinomas arising from anal canal and the rectum separately.It is very important to difierentiate the anorectal lesions pathologically because of the impact on the therapeutic options available,especially for the lesion arising in the anal canal.

  8. File list: Unc.CDV.10.AllAg.Atrioventicular_canals [Chip-atlas[Archive

    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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  15. File list: Unc.CDV.50.AllAg.Atrioventicular_canals [Chip-atlas[Archive

    Lifescience Database Archive (English)

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  16. Efeito de escória de alto forno no crescimento radicular e na produtividade de arroz

    Directory of Open Access Journals (Sweden)

    Carvalho-Pupatto Juliana Garcia

    2003-01-01

    Full Text Available A utilização agrícola de resíduos industriais como fertilizantes decorre da necessidade de diminuir o efeito nocivo do acúmulo de nutrientes nos centros de produção. O objetivo deste trabalho foi avaliar os efeitos de escória de alto forno no crescimento radicular e na produtividade do arroz de terras altas irrigado por aspersão. O experimento foi realizado no campo, adotando-se o delineamento experimental de blocos casualizados, com cinco doses de escória de alto forno (0, 2.550, 5.100, 10.200 e 15.300 kg ha-1 com quatro repetições. A utilização de escória melhorou a condição química do solo, aumentou o crescimento e a superfície radicular, diminuiu o diâmetro das raízes e elevou os teores de silício no solo e na planta, resultando em aumento da produtividade.

  17. Algunos aspectos de la morfología radicular de Hieronyma alchorneoides (Pilón

    Directory of Open Access Journals (Sweden)

    Ileana Moreira González

    2009-01-01

    Full Text Available El desarrollo de las raíces está relacionado con factores genéticos y ambientales tales como el tipo, temperatura y textura del suelo, la disponibilidad de agua y de nutrientes, entre otros. El objetivo del presente trabajo fue describir la anatomía de las raíces finas de Pilón (Hieronyma alchorneoides. Con la ayuda de un barreno, se tomó muestras de suelo cerca de los árboles de Pilón, para posteriormente separar las raíces. Este trabajo se llevó a cabo en la Estación Biológica La Selva, Finca La Guaria, Región Huetar Norte de Costa Rica, Sector Atlántico, en el año 2003. Por otro lado, se colectó cien frutos de Pilón, se los escarificó con una lija y se los puso a germinar en el invernadero para la descripción de las plántulas; otra parte del material se procesó para ser observado al microscopio electrónico de barrido. También se observó el desarrollo radicular de plantas de Pilón en medio hidropónico. La raíz de Hieronyma alchorneoides (Pilón presenta las características anatómicas propias de una dicotiledónea, sin embargo, al producirse en un medio acuático por la hidroponía, se observó en un corte transversal en crecimiento primario, gran cantidad de tejido parenquimático. Las raíces finas muestreadas presentaban gran cantidad de nódulos, lo cual demuestra que esta especie tiene potencial para fijar nitrógeno.

  18. Anatomia radicular de milho em solo compactado Anatomy of maize roots in compacted soil

    Directory of Open Access Journals (Sweden)

    Anderson Cristian Bergamin

    2010-03-01

    Full Text Available O objetivo deste trabalho foi avaliar a relação entre a estrutura anatômica das raízes de milho e os atributos físicos de solo submetido a diferentes graus de compactação. O estudo foi realizado em campo, no Município de Dourados, MS, em Latossolo Vermelho distroférrico, textura muito argilosa. O delineamento experimental foi o de blocos ao acaso, com cinco repetições. O solo utilizado apresentava histórico de oito anos com plantio direto. A compactação adicional do solo foi realizada por meio de tráfego com trator, com uma (PDc1, duas (PDc2, quatro (PDc4 e seis passadas (PDc6 sucessivas, sobre toda a área da parcela. Houve aumento na razão entre o córtex e o cilindro vascular da raiz com o aumento na compactação do solo. Essa razão correlacionou-se negativamente com a macroporosidade e positivamente com a densidade do solo e com a resistência do solo à penetração. O grau de compactação afeta a anatomia radicular do milho, e a resistência do solo à penetração é o indicador físico que melhor expressa esse efeito.The objective of this work was to evaluate the relationship between maize root anatomy and physical attributes of soil subjected to levels of compaction. The experiment was carried out in field conditions, in Dourados, Mato Grosso do Sul state, Brazil, in a clayed Latossolo Vermelho (Rhodic Acrustox. A randomized complete block design was used, with five replicates. The soil was cultivated for eight years under no-tillage. The additional compaction of the soil was done by tractor traffic in one (PDc1, two (PDc2, four (PDc4 and six successive passes (PDc6, in the entire area of the experimental plots. Ratio between the cortex and vascular cylinder of the root increased with soil compaction. This ratio was negatively correlated to macroporosity, and positively to soil density and soil penetration resistance. Soil compaction level affects the anatomy of maize roots, and its penetration resistance is the best

  19. Lodo de esgoto e sistema radicular da pupunheira Sewage sludge doses and the root system of peach palm

    Directory of Open Access Journals (Sweden)

    Fernando Vinicio Armas Vega

    2005-04-01

    Full Text Available Os efeitos do lodo de esgoto sobre o sistema radicular da pupunheira foram estudados em experimento em campo, em blocos casualizados, instalado em Ubatuba (SP, em julho 2001, na densidade de 5.000 plantas ha-1. As doses de lodo de esgoto fresco (79,7 % de umidade utilizadas foram de 0, 38, 76 e 152 t ha-1, equivalentes a 0, 100, 200 e 400 kg ha-1 de N. Os tratamentos foram aplicados no sulco de plantio, adicionando-se 15 g por planta de KCl como fonte de K. A análise do sistema radicular foi efetuada doze meses após, por meio de trado e de trincheiras e com o auxílio de fotos digitais. Detectou-se que o sistema radicular de pupunheiras com um ano de campo estava concentrado nas camadas superficiais (acima de 75 % nos primeiros 20 cm, assim como em distâncias de até 0,5 m da base da planta. O lodo de esgoto modificou positivamente a densidade do solo, alterando também favoravelmente a densidade das raízes. Houve aumento na biomassa radicular proporcional às doses de lodo de esgoto, existindo uma relação direta daquela com a fitomassa aérea. Doses de lodo equivalentes a 200 e 400 kg de N contribuíram para aprofundar o sistema radicular e proporcionaram maior quantidade relativa de raízes finas.The effects of sewage sludge doses on the root system of peach palm were studied in a field experiment, in randomized complete blocks, carried out in Ubatuba, state of São Paulo, Brazil. The trial was set up in July 2001, with a density of 5,000 plants ha-1. The sewage sludge doses (79.7 % water content were 0, 38, 76, and 152 t ha-1, which were equivalent to doses of 0, 100, 200, and 400 kg ha-1 of N. The treatments were applied in the planting furrow, and every plant was provided with K by a dose of 15 g potassium chloride. The root system was analyzed one year after planting using soil auger and digging of trenches and with the help of digital images. It was concluded that the root system of one-year old peach palm was concentrated in the

  20. Cancer of the external auditory canal

    DEFF Research Database (Denmark)

    Nyrop, Mette; Grøntved, Aksel

    2002-01-01

    OBJECTIVE: To evaluate the outcome of surgery for cancer of the external auditory canal and relate this to the Pittsburgh staging system used both on squamous cell carcinoma and non-squamous cell carcinoma. DESIGN: Retrospective case series of all patients who had surgery between 1979 and 2000....... PATIENTS: Ten women and 10 men with previously untreated primary cancer. Median age at diagnosis was 67 years (range, 31-87 years). Survival data included 18 patients with at least 2 years of follow-up or recurrence. INTERVENTION: Local canal resection or partial temporal bone resection. MAIN OUTCOME...

  1. Polyacrylamide Transport in Water Delivery Canals

    Science.gov (United States)

    Chen, L.; Zhu, J.; Young, M.

    2007-12-01

    Linear, anionic polyacrylamide (PAM) is being considered in the western United States as a technology to reduce seepage in unlined water delivery canals. A broad laboratory and field testing program has been undertaken to understand the benefits and potential environmental impacts of PAM use. The ability to predict the fate and transport of PAM in water delivery canals could prove to be a useful planning tool for PAM application. However, one key area of uncertainty of this type of canal treatment is the hydration, reaction, and settling rates of PAM after the dry powder is added to the canal water. In this study, we have developed a model that incorporates a number of known physical and chemical processes that can affect PAM transport, such as convection, dispersion, dissolution, flocculation, and settling, while solving the governing convection-dispersion transport equation. The model uses a mixed analytical and advanced numerical approach, and implements a transient partitioning of PAM mass between the canal water, the substrate soil, and potentially to open water bodies downstream of the application point. All source terms are modeled based on physical and chemical mechanisms as well as laboratory or field determined parameters. To more closely simulate field treatment of some canals, where PAM application moves upstream in time, the model is capable of implementing either a fixed or mobile upper boundary. In the latter treatment, the PAM can be added discretely or continuously in both time and space. A number of test situations have been simulated thus far, including theoretical and hypothetical cases for a wide range of conditions. The model also performed well when predicting PAM concentrations from a full-scale canal treatment experiment. The model provides a useful tool for predicting PAM fate and transport in water delivery canals, and therefore can play an important role in evaluating the efficacy of PAM application for water resources management

  2. Surgical endodontic management of infected lateral canals of maxillary incisors

    Science.gov (United States)

    2015-01-01

    This case report presents surgical endodontic management outcomes of maxillary incisors that were infected via the lateral canals. Two cases are presented in which endodontically-treated maxillary central incisors had sustained lateral canal infections. A surgical endodontic treatment was performed on both teeth. Flap elevation revealed vertical bone destruction along the root surface and infected lateral canals, and microscopy revealed that the lateral canals were the origin of the lesions. After the infected lateral canals were surgically managed, both teeth were asymptomatic and labial fistulas were resolved. There were no clinical or radiographic signs of surgical endodontic management failure at follow-up visits. This case report highlights the clinical significance and surgical endodontic management of infected lateral canal of maxillary incisor. It is important to be aware of root canal anatomy variability in maxillary incisors. Maxillary central incisors infected via the lateral canal can be successfully managed by surgical endodontic treatment. PMID:25671217

  3. Cochlear implant outcomes in patients with superior canal dehiscence

    NARCIS (Netherlands)

    Puram, Sidharth V.; Roberts, Daniel S.; Niesten, Marlien E F; Dilger, Amanda E.; Lee, Daniel J.

    2015-01-01

    Objective: To determine whether adult cochlear implant (CI) users with superior canal dehiscence syndrome (SCDS) or asymptomatic superior semicircular canal dehiscence (SCD) have different surgical, vestibular, and audiologic outcomes when compared to CI users with normal temporal bone anatomy. Meth

  4. Stratification and enumeration of Boolean functions by canalizing depth

    CERN Document Server

    He, Qijun

    2015-01-01

    Boolean network models have gained popularity in computational systems biology over the last dozen years. Many of these networks use canalizing Boolean functions, which has led to increased interest in the study of these functions. The canalizing depth of a function describes how many canalizing variables can be recursively picked off, until a non-canalizing function remains. In this paper, we show how every Boolean function has a unique algebraic form involving extended monomial layers and a well-defined core polynomial. This generalizes recent work on the algebraic structure of nested canalizing functions, and it yields a stratification of all Boolean functions by their canalizing depth. As a result, we obtain closed formulas for the number of n-variable Boolean functions with depth k, which simultaneously generalizes enumeration formulas for canalizing, and nested canalizing functions.

  5. Intradermal melanocytic nevus of the external auditory canal.

    Science.gov (United States)

    Alves, Renato V; Brandão, Fabiano H; Aquino, José E P; Carvalho, Maria R M S; Giancoli, Suzana M; Younes, Eduado A P

    2005-01-01

    Intradermal nevi are common benign pigmented skin tumors. Their occurrence within the external auditory canal is uncommon. The clinical and pathologic features of an intradermal nevus arising within the external auditory canal are presented, and the literature reviewed.

  6. Stratification and enumeration of Boolean functions by canalizing depth

    Science.gov (United States)

    He, Qijun; Macauley, Matthew

    2016-01-01

    Boolean network models have gained popularity in computational systems biology over the last dozen years. Many of these networks use canalizing Boolean functions, which has led to increased interest in the study of these functions. The canalizing depth of a function describes how many canalizing variables can be recursively "picked off", until a non-canalizing function remains. In this paper, we show how every Boolean function has a unique algebraic form involving extended monomial layers and a well-defined core polynomial. This generalizes recent work on the algebraic structure of nested canalizing functions, and it yields a stratification of all Boolean functions by their canalizing depth. As a result, we obtain closed formulas for the number of n-variable Boolean functions with depth k, which simultaneously generalizes enumeration formulas for canalizing, and nested canalizing functions.

  7. Nutrientes no mantilho em pastagem nativa sob distintos manejos

    Directory of Open Access Journals (Sweden)

    Heringer Ingrid

    2002-01-01

    Full Text Available A avaliação da quantidade de nutrientes no mantilho é importante para verificar a ciclagem de nutrientes e a preservação da fertilidade do solo. O teor e a quantidade de nutrientes no mantilho e material senescente foram estudados em pastagem nativa sob pastejo, sujeita à queima e manejos alternativos, durante um ano, nos Campos de Cima da Serra, no Rio Grande do Sul. O acúmulo de mantilho foi coletado em gaiolas de exclusão ao pastejo, a cada 90 dias. O mantilho representou o material morto desprendido da planta existente junto à superfície do solo. A esta fração foi adicionado o material senescente ligado à planta. Os tratamentos foram pastagem nativa sob pastejo sem queima e sem roçada há 32 anos, melhorada há sete anos e com queima bienal há mais de 100 anos. O delineamento experimental foi completamente casualizado com três repetições. Os teores de Ca e Mg no mantilho mais material senescente foram inferiores no tratamento queimado em relação às áreas sem queima. O melhoramento da pastagem aumentou os teores de nutrientes nos tecidos. A quantidade acumulada de nutrientes, reflexo da produção de mantilho e material senescente, foi maior nos sistemas sem queima.

  8. Viscoelastic assessment of anal canal function using acoustic reflectometry

    DEFF Research Database (Denmark)

    Mitchell, Peter J; Klarskov, Niels; Telford, Karen J;

    2012-01-01

    Anal acoustic reflectometry is a new reproducible technique that allows a viscoelastic assessment of anal canal function. Five new variables reflecting anal canal function are measured: the opening and closing pressure, opening and closing elastance, and hysteresis.......Anal acoustic reflectometry is a new reproducible technique that allows a viscoelastic assessment of anal canal function. Five new variables reflecting anal canal function are measured: the opening and closing pressure, opening and closing elastance, and hysteresis....

  9. 75 FR 32275 - Regulated Navigation Area; Gulf Intracoastal Waterway, Inner Harbor Navigation Canal, Harvey...

    Science.gov (United States)

    2010-06-08

    ..., Inner Harbor Navigation Canal, Harvey Canal, Algiers Canal, New Orleans, LA AGENCY: Coast Guard, DHS...), Harvey Canal, and Algiers Canal during severe hurricane conditions. Vessels will not be permitted to stay... communities within the IHNC, Harvey, and Algiers Canals from potential hazards associated with vessels...

  10. 21 CFR 872.3820 - Root canal filling resin.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Root canal filling resin. 872.3820 Section 872.3820 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3820 Root canal filling resin. (a) Identification. A root canal filling resin is a...

  11. 33 CFR 117.455 - Houma Navigation Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Houma Navigation Canal. 117.455 Section 117.455 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.455 Houma Navigation Canal. The draw of SR 661 (Houma Nav Canal) bridge,...

  12. 21 CFR 872.3810 - Root canal post.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Root canal post. 872.3810 Section 872.3810 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3810 Root canal post. (a) Identification. A root canal post is a device made of austenitic alloys...

  13. Nerve canals at the fundus of the internal auditory canal on high-resolution temporal bone CT

    Energy Technology Data Exchange (ETDEWEB)

    Ji, Yoon Ha; Youn, Eun Kyung; Kim, Seung Chul [Sungkyunkwan Univ., School of Medicine, Seoul (Korea, Republic of)

    2001-12-01

    To identify and evaluate the normal anatomy of nerve canals in the fundus of the internal auditory canal which can be visualized on high-resolution temporal bone CT. We retrospectively reviewed high-resolution (1 mm thickness and interval contiguous scan) temporal bone CT images of 253 ears in 150 patients who had not suffered trauma or undergone surgery. Those with a history of uncomplicated inflammatory disease were included, but those with symptoms of vertigo, sensorineural hearing loss, or facial nerve palsy were excluded. Three radiologists determined the detectability and location of canals for the labyrinthine segment of the facial, superior vestibular and cochlear nerve, and the saccular branch and posterior ampullary nerve of the inferior vestibular nerve. Five bony canals in the fundus of the internal auditory canal were identified as nerve canals. Four canals were identified on axial CT images in 100% of cases; the so-called singular canal was identified in only 68%. On coronal CT images, canals for the labyrinthine segment of the facial and superior vestibular nerve were seen in 100% of cases, but those for the cochlear nerve, the saccular branch of the inferior vestibular nerve, and the singular canal were seen in 90.1%, 87.4% and 78% of cases, respectiveIy. In all detectable cases, the canal for the labyrinthine segment of the facial nerve was revealed as one which traversed anterolateralIy, from the anterosuperior portion of the fundus of the internal auditory canal. The canal for the cochlear nerve was located just below that for the labyrinthine segment of the facial nerve, while that canal for the superior vestibular nerve was seen at the posterior aspect of these two canals. The canal for the saccular branch of the inferior vestibular nerve was located just below the canal for the superior vestibular nerve, and that for the posterior ampullary nerve, the so-called singular canal, ran laterally or posteolateralIy from the posteroinferior aspect of

  14. Root canal cleaning through cavitation and microstreaming

    NARCIS (Netherlands)

    Verhaagen, B.

    2012-01-01

    We have investigated the flow from a needle using Computational Fluid Dynamics simulations and high-speed imaging experiments on sub-millimeter fluidic channels. These have shown that the flow is not effective in delivering the bleach near the bacteria, due to the complex geometry of the root canal.

  15. The crazy project – Canal Istanbul

    Directory of Open Access Journals (Sweden)

    Seda Kundak

    2011-10-01

    Full Text Available It was late April 2011 when “the Crazy Project - Canal Istanbul” was proposed by the Prime Minister of Turkey, during his election campaign.  Although the idea of an artificial canal is not new, since it is initiated without any consensus between the people and institutions in Istanbul, the project immediately set a large number of debates. These vary from the legitimacy of decentralization of governance, to potential impacts of the canal on international politics, economy, environment and urban life.  Regarding past infrastructure projects in Istanbul, such large scale investments have caused extensive acceleration in construction sector in one hand and social and economic shifts on the other.  In this paper, the Canal Istanbul Project is evaluated according to basic motivations and claims of the PM, multi-perspective view through challenges and limitation that the project is likely to face with and speculations on implementation approach. The final discussion on the project is based on benefits/losses of Istanbul once the project will be implemented.

  16. Note on Tendipedidae of the Suez Canal

    NARCIS (Netherlands)

    Kruseman, G.

    1949-01-01

    Mr. A. C. V. VAN BEMMEL and Dr. A. DIAKONOFF of the Buitenzorg Museum (Java) collected Tendipedidae, which were attracted by artificial lights, when they passed the Suez Canal on 8-XI-1937 and 16-V-1939 respectively. This very interesting collection, containing some new species, was sent to me for d

  17. Infrared tympanic temperature and ear canal morphology

    NARCIS (Netherlands)

    Daanen, H.A.M.

    2006-01-01

    Several publications indicate that the infrared tympanic temperature (IRTT) underestimates the core temperature of the body when the ear canal is long, curvy and narrow. In order to quantify these observations, a study was performed in 10 subjects. The IRTT was determined and compared to the oesopha

  18. Effect of root canal filling techniques on the bond strength of epoxy resin-based sealers.

    Science.gov (United States)

    Rached-Júnior, Fuad Jacob Abi; Souza, Angélica Moreira; Macedo, Luciana Martins Domingues; Raucci-Neto, Walter; Baratto-Filho, Flares; Silva, Bruno Marques; Silva-Sousa, Yara Teresinha Corrêa

    2016-01-01

    The aim of this study was to evaluate the effects of different root canal filling techniques on the bond strength of epoxy resin-based sealers. Sixty single-rooted canines were prepared using ProTaper (F5) and divided into the following groups based on the root filling technique: Lateral Compaction (LC), Single Cone (SC), and Tagger Hybrid Technique (THT). The following subgroups (n = 10) were also created based on sealer material used: AH Plus and Sealer 26. Two-millimeter-thick slices were cut from all the root thirds and subjected to push-out test. Data (MPa) was analyzed using ANOVA and Tukey's test (α = 0.05). The push-out values were significantly affected by the sealer, filling technique, and root third (p < 0.05). AH Plus (1.37 ± 1.04) exhibited higher values than Sealer 26 (0.92 ± 0.51), while LC (1.80 ± 0.98) showed greater bond strength than THT (1.16 ± 0.50) and SC (0.92 ± 0.25). The cervical (1.45 ± 1.14) third exhibited higher bond strength, followed by the middle (1.20 ± 0.72) and apical (0.78 ± 0.33) thirds. AH Plus/LC (2.26 ± 1.15) exhibited the highest bond strength values, followed by AH Plus/THT (1.32 ± 0.61), Sealer 26/LC (1.34 ± 0.42), and Sealer 26/THT (1.00 ± 0.27). The lowest values were obtained with AH Plus/SC and Sealer 26/SC. Thus, it can be concluded that the filling technique affects the bond strength of sealers. LC was associated with higher bond strength between the material and intra-radicular dentine than THT and SC techniques.

  19. MR determination of neonatal spinal canal depth

    Energy Technology Data Exchange (ETDEWEB)

    Arthurs, Owen, E-mail: owenarthurs@uk2.net [Centre for Cardiovascular MR, Great Ormond Street Hospital for Children, London WC1N 3JH (United Kingdom); Thayyil, Sudhin, E-mail: s.thayyil@ucl.ac.uk [Academic Neonatology, Institute for Women' s Health, London WC1E 6AU (United Kingdom); Wade, Angie, E-mail: a.wade@ucl.ac.uk [Centre for Paediatric Epidemiology and Biostatistics, UCL Institute of Child Health, London (United Kingdom); Chong, W.K., E-mail: Kling.Chong@gosh.nhs.uk [Paediatric Neuroradiology, Great Ormond Street Hospital for Children, London (United Kingdom); Sebire, Neil J., E-mail: Neil.Sebire@gosh.nhs.uk [Histopathology, Great Ormond Street Hospital for Children, London WC1E 6AU (United Kingdom); Taylor, Andrew M., E-mail: a.taylor76@ucl.ac.uk [Centre for Cardiovascular MR, Cardiorespiratory Unit, Great Ormond Street Hospital for Children and UCL Institute of Cardiovascular Science, London WC1E 6AU (United Kingdom)

    2012-08-15

    Objectives: Lumbar punctures (LPs) are frequently performed in neonates and often result in traumatic haemorrhagic taps. Knowledge of the distance from the skin to the middle of the spinal canal (mid-spinal canal depth - MSCD) may reduce the incidence of traumatic taps, but there is little data in extremely premature or low birth weight neonates. Here, we determined the spinal canal depth at post-mortem in perinatal deaths using magnetic resonance imaging (MRI). Patients and methods: Spinal canal depth was measured in 78 post-mortem foetuses and perinatal cases (mean gestation 26 weeks; mean weight 1.04 kg) at the L3/L4 inter-vertebral space at post-mortem MRI. Both anterior (ASCD) and posterior (PSCD) spinal canal depth were measured; MSCD was calculated and modelled against weight and gestational age. Results: ASCD and PSCD (mm) correlated significantly with weight and gestational age (all r > 0.8). A simple linear model MSCD (mm) = 3 Multiplication-Sign Weight (kg) + 5 was the best fit, identifying an SCD value within the correct range for 87.2% (68/78) (95% CI (78.0, 92.9%)) cases. Gestational age did not add significantly to the predictive value of the model. Conclusion: There is a significant correlation between MSCD and body weight at post-mortem MRI in foetuses and perinatal deaths. If this association holds in preterm neonates, use of the formula MSCD (mm) = 3 Multiplication-Sign Weight (kg) + 5 could result in fewer traumatic LPs in this population.

  20. Cervical spinal canal narrowing in idiopathic syringomyelia

    Energy Technology Data Exchange (ETDEWEB)

    Struck, Aaron F. [Massachusetts General Hospital, Department of Neurology, Boston, MA (United States); Carr, Carrie M. [Mayo Clinic, Department of Radiology, Rochester, MN (United States); Shah, Vinil [University of California San Francisco, Department of Radiology, San Francisco, CA (United States); Hesselink, John R. [University of California San Diego, Department of Radiology, San Diego, CA (United States); Haughton, Victor M. [University of Wisconsin, Department of Radiology, Madison, WI (United States)

    2016-08-15

    The cervical spine in Chiari I patient with syringomyelia has significantly different anteroposterior diameters than it does in Chiari I patients without syringomyelia. We tested the hypothesis that patients with idiopathic syringomyelia (IS) also have abnormal cervical spinal canal diameters. The finding in both groups may relate to the pathogenesis of syringomyelia. Local institutional review boards approved this retrospective study. Patients with IS were compared to age-matched controls with normal sagittal spine MR. All subjects had T1-weighted spin-echo (500/20) and T2-weighted fast spin-echo (2000/90) sagittal cervical spine images at 1.5 T. Readers blinded to demographic data and study hypothesis measured anteroposterior diameters at each cervical level. The spinal canal diameters were compared with a Mann-Whitney U test. The overall difference was assessed with a Friedman test. Seventeen subjects were read by two reviewers to assess inter-rater reliability. Fifty IS patients with 50 age-matched controls were studied. IS subjects had one or more syrinxes varying from 1 to 19 spinal segments. Spinal canal diameters narrowed from C1 to C3 and then enlarged from C5 to C7 in both groups. Diameters from C2 to C4 were narrower in the IS group (p < 0.005) than in controls. The ratio of the C3 to the C7 diameters was also smaller (p = 0.004) in IS than controls. Collectively, the spinal canal diameters in the IS were significantly different from controls (Friedman test p < 0.0001). Patients with IS have abnormally narrow upper and mid cervical spinal canal diameters and greater positive tapering between C3 and C7. (orig.)

  1. Manejo estético y endodóncico de dientes con formación radicular incompleta

    Directory of Open Access Journals (Sweden)

    L.A. Dávila Rodríguez

    2013-08-01

    Full Text Available La necrosis pulpar es una de las principales complicaciones de los traumatismos dentales lo que implica en un diente inmaduro la interrupción de la maduración de la raíz y el cierre apical. Una terapia llamada "apexificación" se requiere para inducir la formación de una barrera calcificada apical permitiendo un relleno permanente y hermético de la raíz. Numerosos materiales han sido recomendados para inducir apexificación y conservar la estética en dientes con ápices inmaduros como el mineral trióxido agregado (MTA, el hidróxido de calcio [Ca (OH2], los postes de fibra de vidrio y entre los diversos materiales utilizados en prótesis, la cerámica que reproduce la apariencia de la dentición natural y tiene un comportamiento óptico muy similar a la de los tejidos duros dentales. El presente caso reporta paciente masculino de 17 años de edad con fractura coronaria complicada, conducto radicular expuesto a cavidad oral con formación radicular incompleta. El objetivo del presente caso clínico es describir la apexificación como primera alternativa para mantener un diente útil, utilizando la formación de una barrera apical con mineral trióxido agregado (MTA y recuperar la estética del paciente. Conclusiones: La medicación intraconducto adecuada para la inducción a la formación de un cierre apical en un diente inmaduro o con formación radicular incompleta, es de trascendental importancia para el éxito del proceso de apexificación en donde juega un papel importante el MTA ya que en la actualidad es el material que brinda más ventajas en esta práctica como inductor de dicho proceso.

  2. Stellate Ganglion Block Reduces the Radicular Pain and Salivary Alpha-Amylase Activity in Patients with Cervical Spondylosis

    Directory of Open Access Journals (Sweden)

    Takashi Egashira

    2015-03-01

    Full Text Available Background The effects of stellate ganglion block (SGB on radicular pain associated with cervical spondylosis remain to be clarified. So we measured salivary alpha-amylase which reflects sympathetic nerve activity under psychological stress after SGB block or trigger points injection (TPI. Study Design A randomized, prospective, controlled trial Setting After institutional approval and informed consent, 40 patients who was suffered from neck-shoulder pain associated with cervical radiculopathy were randomly divided into two groups according to nerve block treatment. Group A (n=20, male 10 patients, female 10 patients, 50±8yr, mean±SD received SGB and group B (n=20, male 10 patients, female 10 patients, 52±6yr received TPI. SGB or TPI was produced by 6 ml of 1% mepivacaine a total of 5 times (twice per week. Visual analogue scale (VAS and the concentration of salivary alpha-amylase were measured before (T0 each nerve block and 3 days (T1, 6 days (T2, 9 days (T3, 12 days (T4 and 15days (T5 after each nerve block. The consumption of non-steroidal anti-inflammatory drug (NSAID was measured at T0 and T5 in each group. Results In group A, VAS was median 74 (range 60, 78 at T0 and showed a significant decrease at T3 [53 (48, 65, p<0.05], T4 [50 (42, 66, p<0.05] and T5 [48 (26,57, p<0.05]. The concentration of salivary alpha-amylase was median 116 (range 96, 144 KU/ml at T0 and showed a significant decrease at T3 [86 (79, 105, p<0.05], T4 [79 (68, 88] and T5 [70 (55, 84, p<0.05]. In group B, VAS and the concentration of salivary alpha-amylase showed no change throughout the time course. VAS in group A was significant lower than that in group B at T3, T4 and T5. The concentration of salivary alpha-amylase was significant lower than that in group B at T4 and T5. The consumption of NSAID in group A was significantly lower than that in group B at T5. Limitations Subjects are out patients. Patients include radicular pain due to different pathogenesis, e

  3. Exsudação radicular de glyphosate por Brachiaria decumbens e seus efeitos em plantas de eucalipto Radicular exudation of glyphosate by Brachiaria decumbens and its effects on eucalypt plant

    Directory of Open Access Journals (Sweden)

    L.D. Tuffi Santos

    2008-06-01

    Full Text Available Plantas de eucalipto com sintomas de intoxicação por glyphosate são comuns em áreas em que esse herbicida é usado. Uma das possíveis formas de contato com glyphosate é por meio da exsudação radicular do produto, por plantas daninhas tratadas, e subseqüente absorção pelas plantas de eucalipto. Objetivou-se com este trabalho avaliar a exsudação de glyphosate por Brachiaria decumbens e seus efeitos sobre plantas de eucalipto, por meio da aplicação de 14C-glyphosate misturado à calda de pulverização do produto comercial. Mudas de dois clones de eucalipto (UFV05 e UFV06 foram cultivadas em consórcio com Brachiaria decumbens (capim-braquiária, em vasos contendo dois tipos de solo: um arenoso e outro argiloso. Aos 35 dias após o transplantio das mudas, foram aplicados na braquiária 50 µL da mistura de 14C-glyphosate com a formulação comercial de glyphosate Scout®, utilizando-se uma microsseringa de precisão. Aos 2, 8, 16 e 24 dias após aplicação, as plantas de eucalipto foram coletadas e fracionadas em ápice primário, ápices secundários, folhas e raízes, sendo processadas de acordo com metodologia usual para determinação da radioatividade. Não foram observados sintomas de intoxicação por glyphosate nas plantas de eucalipto, em nenhuma das avaliações realizadas. Entretanto, o 14C-glyphosate foi encontrado em todas as plantas de eucalipto avaliadas, independentemente do solo, do clone e da época de avaliação, em maior concentração em plantas cultivadas no solo arenoso. Os resultados evidenciam a exsudação radicular do glyphosate e/ou de seus metabólitos pela braquiária e subseqüente absorção, via raízes, pelas plantas de eucalipto, em concentrações inferiores às necessárias para causar intoxicação na cultura.Eucalypt plants commonly present symptoms of intoxication in areas where glyphosate is used. One possible way of contamination is through radicular exudation of glyphosate by the treated

  4. Associação entre a presença de restos radiculares e a autopercepção de saúde bucal em idosos

    Directory of Open Access Journals (Sweden)

    Aline Blaya Martins

    2015-12-01

    Full Text Available Resumo A presença de restos radiculares é um achado clínico comum entre os idosos e pode refletir necessidades de tratamento. O objetivo deste estudo foi analisar a associação entre a presença de restos radiculares e a autopercepção de saúde bucal por idosos. Foram analisados dados secundários de dois distritos sanitários de Porto Alegre-RS, com base em um modelo teórico conceitual para investigar fatores relacionados com autopercepção de saúde bucal: gênero, idade, escolaridade, situação marital, tabagismo, hábito etílico, procura por cuidados em saúde bucal, participação em grupos, renda familiar suficiente, serviço de saúde bucal acessado, número de dentes e presença de restos radiculares. Os dados foram analisados por testes de Qui-quadrado e Regressão de Poisson (IC 95%; α 5%. A amostra foi composta por 849 idosos com idade média de 69,7 anos (± 7,2; 14,5% deles tinham restos radiculares mantidos em boca e 60,7% referiram sua percepção de saúde bucal como boa. A análise hierárquica mostrou associação entre a ausência de restos radiculares e a autopercepção positiva de saúde bucal. A qualificação e a ampliação da oferta do cuidado continuado devem ser pensadas, para permitir ações que garantam a manutenção de boas condições de saúde bucal para a população idosa.

  5. Radicular anatomy of twelve representatives of the Catasetinae subtribe (Orchidaceae: Cymbidieae

    Directory of Open Access Journals (Sweden)

    Cristiano Pedroso-de-Moraes

    2012-06-01

    ças estruturais observadas entre todas as raízes estudadas confirmam a inclusão da subtribo Catasetinae na tribo monofilética Cymbidieae. Algumas características radiculares são restritas a um ou dois táxons e podem ser úteis na taxonomia da subtribo. Por exemplo, a ocorrência de cristais flavonoídicos caracteriza os gêneros Catasetum e Cychnodes e o número de camadas do velame associado à forma das células do epivelame são úteis para confirmar a posição taxonômica de Clowesia amazônica. A presença de velame e de cristais flavonoídicos foi interpretada como adaptações ao hábito epifítico.

  6. Estudo da anatomia interna dos canais radiculares em pré-molares e suas modificações com a instrumentação com limas k, PathFiles e sistema ProTaper ou GTX

    OpenAIRE

    Antunes Guimarães, Duarte Nuno

    2013-01-01

    Devido às peculiares características do campo de tratamento endodôntico, sem visão direta e complexidade de sistema de canais radiculares, torna-se essencial um estudo preliminar para um bom prognóstico e sucesso do tratamento. A variação da morfologia dos sistemas de canais radiculares ocorre com frequência e pode ser considerada normal. É geralmente aceite, que uma das principais causas do fracasso do tratamento dos canais radiculares é a incapacidade de os reconhecer e tr...

  7. Dorello's Canal for Laymen: A Lego-Like Presentation.

    Science.gov (United States)

    Ezer, Haim; Banerjee, Anirban Deep; Thakur, Jai Deep; Nanda, Anil

    2012-06-01

    Objective Dorello's canal was first described by Gruber in 1859, and later by Dorello. Vail also described the anatomy of Dorello's canal. In the preceding century, Dorello's canal was clinically important, in understanding sixth nerve palsy and nowadays it is mostly important for skull base surgery. The understanding of the three dimensional anatomy, of this canal is very difficult to understand, and there is no simple explanation for its anatomy and its relationship with adjacent structures. We present a simple, Lego-like, presentation of Dorello's canal, in a stepwise manner. Materials and Methods Dorello's canal was dissected in five formalin-fixed cadaver specimens (10 sides). The craniotomy was performed, while preserving the neural and vascular structures associated with the canal. A 3D model was created, to explain the canal's anatomy. Results Using the petrous pyramid, the sixth nerve, the cavernous sinus, the trigeminal ganglion, the petorclival ligament and the posterior clinoid, the three-dimensional structure of Dorello's canal was defined. This simple representation aids in understanding the three dimensional relationship of Dorello's canal to its neighboring structures. Conclusion Dorello's canal with its three dimensional structure and relationship to its neighboring anatomical structures could be reconstructed using a few anatomical building blocks. This method simplifies the understanding of this complex anatomical structure, and could be used for teaching purposes for aspiring neurosurgeons, and anatomy students.

  8. Comparison of the rheological properties of four root canal sealers

    Institute of Scientific and Technical Information of China (English)

    Seok Woo Chang; Kwang Shik Bae; Young-Kyu Lee; Qiang Zhu; Won Jun Shon; Woo Cheol Lee; Kee Yeon Kum; Seung Ho Baek; In Bog Lee; Bum-Soon Lim

    2015-01-01

    The flowability of a root canal sealer is clinically important because it improves the penetration of the sealer into the complex root canal system. The purpose of this study was to compare the flowabilities of four root canal sealers, measured using the simple press method (ISO 6876), and their viscosities, measured using a strain-controlled rheometer. A newly developed, calcium phosphate-based root canal sealer (Capseal) and three commercial root canal sealers (AH Plus, Sealapex and Pulp Canal Sealer EWT) were used in this study. The flowabilities of the four root canal sealers were measured using the simple press method (n55) and their viscosities were measured using a strain-controlled rheometer (n55). The correlation between these two values was statistically analysed using Spearman’s correlation test. The flow diameters and the viscosities of the root canal sealers were strongly negatively correlated (r520.8618). The viscosity of Pulp Canal Sealer EWT was the lowest and increased in the following order:AH Plus,Sealapex,Capseal (P,0.05). All of the tested root canal sealers showed characteristic time-and temperature-dependent changes in their rheological properties. The viscosities measured using the strain-controlled rheometer were more precise than the flowabilities measured using the simple press method, suggesting that the rheometer can accurately measure the rheological properties of root canal sealers.

  9. Research on Canal System Operation Based on Controlled Volume Method

    Directory of Open Access Journals (Sweden)

    Zhiliang Ding

    2009-10-01

    Full Text Available An operating simulation mode based on storage volume control method for multireach canal system in series was established. In allusion to the deficiency of existing controlled volume algorithm, the improved algorithm was proposed, that is the controlled volume algorithm of whole canal pools, the simulation results indicate that the storage volume and water level of each canal pool can be accurately controlled after the improved algorithm was adopted. However, for some typical discharge demand change operating conditions of canal, if the controlled volume algorithm of whole canal pool is still adopted, then it certainly will cause some unnecessary regulation, and consequently increases the disturbed canal reaches. Therefor, the idea of controlled volume operation method of continuous canal pools was proposed, and its algorithm was designed. Through simulation to practical project, the results indicate that the new controlled volume algorithm proposed for typical operating condition can comparatively obviously reduce the number of regulated check gates and disturbed canal pools for some typical discharge demand change operating conditions of canal, thus the control efficiency of canal system was improved. The controlled volume method of operation is specially suitable for large-scale water delivery canal system which possesses complex operation requirements.

  10. Short-term outcome of fluoroscopic-guided steroid injection therapy of lumber facet cyst-induced radicular pain

    Energy Technology Data Exchange (ETDEWEB)

    Kwon, Mi Ri; Kwon, Jong Won; Lee, Jong Seo; Kim, Eu Sang [Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of)

    2015-04-15

    To determine the short-term effect of fluoroscopic-guided steroid injection therapy of lumbar facet cyst-induced radicular pain. Seventeen patients with radiculopathy due to lumbar synovial cysts, who were treated with fluoroscopically guided injection, were retrospectively evaluated. All plain radiographic images and MR images before the therapy were reviewed. Five patients underwent only the facet joint injection, whereas twelve patients underwent the facet joint injection with perineural injection therapy. The clinical course of pain was evaluated on the first follow-up after therapy. Effective pain relief was achieved in 11 (64.7%) of the 17 patients. Among 12 patients who underwent facet joint injection with perineural injection, 9 patients (75%) had an effective pain relief. Of 5 patients, 2 (40%) patients only took the facet joint injection and had an effective pain relief. Fluoroscopic-guided steroid injection therapy shows a good short-term effect in patients with symptomatic lumbar facet joint synovial cysts.

  11. ALELOPATIA DE Arctium minus BERNH (ASTERACEAE NA GERMINAÇÃO E CRESCIMENTO RADICULAR DE SORGO E PEPINO

    Directory of Open Access Journals (Sweden)

    Valdenir José Belinelo

    2008-01-01

    Full Text Available The objectives of this work were identified and characterize the allelopatic activity of extracts obtained from Arctium minus (Hill Bernh (Asteraceae. The fitotoxic activity of organic extracts (1 e 100 mg.L-1 and aqueous extract (5,00 e 0,05% m/v on the germination and radicular growth of the monocotyledon Sorghum bicolor L. (sorghum, and the dicotyledon Cucumis sativus L. (cucumber were evaluated. The results showed the presence of allelopatic activity variable in according to the extract concentration and with the target plant. The intensity of induced inhibitory effect was higher for the ethanolic extract in concentration of 100 mg.L-1 for Sorghum bicolor L. The results also indicates the existence of the potential use of Arctium minus (Hill Bernh ethanolic extract as a natural herbicide and open perspectives for the research of the constituent(s with higher allelopatic activity.

  12. Armazenamento de sementes de palmiteiro sob atmosfera modificada

    Directory of Open Access Journals (Sweden)

    Maite dos Santos ribeiro

    2010-12-01

    Full Text Available Este trabalho objetivou avaliar o efeito do armazenamento sob atmosfera modificada (AM, passiva e ativa, sobre o desempenho de sementes de Euterpe edulis Martius. Os tratamentos avaliados foram: T1 - controle (sem embalagem; T2 - polietileno de baixa densidade (PEBD; T3 - PEBD + absorvedor de CO2, T4 - PEBD + N2; e T5 - PEBD + absorvedor de CO2 + N2. O tratamento T2 consistiu no armazenamento em AM passiva e os tratamentos T3, T4 e T5 no armazenamento em AM ativa. As sementes foram armazenadas por 150 e 480 dias a 7 ºC. Após 150 dias de armazenamento, as sementes dos tratamentos com AM (passiva ou ativa mantiveram germinação (%, velocidade de emergência (VE, grau de umidade e vigor (comprimento da parte aérea e da raiz primária e menor condutividade elétrica superiores ao tratamento controle. Após 480 dias de armazenamento, as sementes armazenadas nos tratamentos PEBD, PEBD + N2 e PEBD + absorvedor de CO2 + N2 estavam com maior germinação e menor condutividade elétrica, enquanto as sementes dos tratamentos PEBD e PEBD + N2, maior VE, comprimento da parte aérea e da raiz. O grau de umidade não variou significativamente entre os tratamentos de AM, mas esses foram superiores ao controle. A AM contribui para preservar o desempenho das sementes de Euterpe edulis por um período de até 150 dias de armazenamento. Quando há extensão desse período para 480 dias, tanto sob AM passiva como AM ativa, a injeção de N2 é benéfica à conservação de sementes de Euterpe edulis.

  13. Associação entre características da parte aérea e do sistema radicular em mudas de guaranazeiro por correlações canônicas Canonical correlations among characteristics of shoots and roots system in guarana seedlings

    Directory of Open Access Journals (Sweden)

    Firmino José do Nascimento Filho

    2012-06-01

    Full Text Available Este trabalho teve como objetivo quantificar o grau de asociação entre variáveis de parte aérea e de raízes em mudas clonadas de guaranazeiro, utilizando-se correlações canônicas, a fim de aperfeiçoar o procedimento de seleção de mudas para garantir o aumento da porcentagem de sobrevivência das mudas após o plantio. Foram avaliados dois grupos de variáveis em mudas aptas ao plantio definitivo de 36 clones de guaranazeiro. O delineamento usado foi o aleatorizado em blocos com cinco repetições e 10 plantas por parcela, sob condições de viveiro. Os caracteres avaliados foram submetidos à análise de correlações canônicas. Utilizou-se a análise de correlações canônicas. O grupo de variáveis da parte aérea não se mostrou independente do grupo de variáveis do sistema radicular. Através de seleção baseada em variáveis da parte aérea pode-se melhorar o sistema radicular, principalmente através do maior comprimento do ramo (CRA. A seleção de clones de guaraná para maior peso de raiz pode ser efetuada de forma indireta, realizando-se mensurações do comprimento dos ramos, o que evita a necessidade de se destruir as mudas.This study aimed to quantify the degree of association between variables of shoots and roots system of seedlings cloned from guarana, using canonical correlations, in order to improve the procedure of selection of seedlings to ensure increased survival percentage of seedlings after planting. Two groups of variables suitable for final planting seedlings in 36 guarana clones. The experimental design was a randomized complete block with five replications and 10 plants per plot, under nursery conditions. We used the canonical correlation analysis. The group of variables of shoot is not independent of variable group of root system. Through selection based on variables from the air, you can improve the root system, mainly through the greater length of the branch (CRA. Can practice the selection of clones

  14. Pain patterns and descriptions in patients with radicular pain: Does the pain necessarily follow a specific dermatome?

    Directory of Open Access Journals (Sweden)

    Hurwitz Eric L

    2009-09-01

    Full Text Available Abstract Background It is commonly stated that nerve root pain should be expected to follow a specific dermatome and that this information is useful to make the diagnosis of radiculopathy. There is little evidence in the literature that confirms or denies this statement. The purpose of this study is to describe and discuss the diagnostic utility of the distribution of pain in patients with cervical and lumbar radicular pain. Methods Pain drawings and descriptions were assessed in consecutive patients diagnosed with cervical or lumbar nerve root pain. These findings were compared with accepted dermatome maps to determine whether they tended to follow along the involved nerve root's dermatome. Results Two hundred twenty-six nerve roots in 169 patients were assessed. Overall, pain related to cervical nerve roots was non-dermatomal in over two-thirds (69.7% of cases. In the lumbar spine, the pain was non-dermatomal in just under two-thirds (64.1% of cases. The majority of nerve root levels involved non-dermatomal pain patterns except C4 (60.0% dermatomal and S1 (64.9% dermatomal. The sensitivity (SE and specificity (SP for dermatomal pattern of pain are low for all nerve root levels with the exception of the C4 level (Se 0.60, Sp 0.72 and S1 level (Se 0.65, Sp 0.80, although in the case of the C4 level, the number of subjects was small (n = 5. Conclusion In most cases nerve root pain should not be expected to follow along a specific dermatome, and a dermatomal distribution of pain is not a useful historical factor in the diagnosis of radicular pain. The possible exception to this is the S1 nerve root, in which the pain does commonly follow the S1 dermatome.

  15. Water quality of the Boca Raton canal system and effects of the Hillsboro Canal inflow, southeastern Florida, 1990-91

    Science.gov (United States)

    McKenzie, D.J.

    1995-01-01

    The City of Boca Raton in southeastern Palm Beach County, Florida, is an urban residential area that has sustained a constant population growth with subsequent increase in water use. The Boca Raton network of canals is controlled to provide for drainage of excess water, to maintain proper coastal ground-water levels to prevent saltwater intrusion, and to recharge the surficial aquifer system from which the city withdraws potable water. Most of the water supplied to the Boca Raton canal system and the surficial aquifer system, other than rainfall and runoff, is pumped from the Hillsboro Canal. The Biscayne aquifer, principal hydrogeologic unit of the surficial aquifer system, is highly permeable and there is a close relation between water levels in the canals and the aquifer. The amount of water supplied by seepage from the conservation areas is unknown. Because the Hillsboro Canal flows from Lake Okeechobee and Water Conservation Areas 1 and 2, which are places of more highly mineralized ground water and surface water, the canal is a possible source of contamination. Water samples were collected at 10 canal sites during wet and dry seasons and analyzed for major inorganic ions and related characteristics, nutrients, and trace elements. All concentrations were generally within or less than the drinking-water standards established by the Florida Department of Environmental Protection. The high concentrations of sodium and chloride that were detected in samples from the Boca Raton canal system are probably from the more mineralized water of the Hillsboro Canal. Other water-quality data, gathered from various sources from 1982 through 1991, did not indicate any significant changes nor trends. The effects of the Hillsboro Canal on the water quality of the Boca Raton canal system are indicated by increased concentrations of sodium, chloride, dissolved solids, and total organic carbon. Concentrations of the constituents in the canal water generally decrease with distance

  16. Inequality and megaprojects: The Panama Canal expansion

    OpenAIRE

    2006-01-01

    Cuando el control y gestión del Canal de Panamá pasó al estado panameño a finales de 1999, el gobierno comenzó a preparar un plan para su modernización. Este plan incluía la construcción de nuevas esclusas para que pudieran atravesarlo un mayor número de barcos y que admitiese los nuevos buques Post-Panamax de gran tamaño. El proyecto de Ampliación del Canal se ha seleccionado como ejemplo paradigmático de grandes Obras Públicas (GOP) por su impacto ambiental, económico y social. Este caso de...

  17. Anal cancer; Cancer du canal anal

    Energy Technology Data Exchange (ETDEWEB)

    Fesneau, M.; Champeaux-Orange, E. [Service de radiotherapie, Centre regional universitaire de cancerologie Henry-S.-Kaplan CHU de Tours, Hopital Bretonneau, 37 - Tours (France); Champeaux-Orange, E. [Service d' oncologie-radiotherapie, Centre hospitalier regional d' Orleans, 45 - Orleans (France); Hennequin, C. [Service de cancerologie-radiotherapie, hopital Saint-Louis, 75 - Paris (France)

    2010-07-01

    Anal canal epidermoid carcinomas represent 1.2% of digestive cancers and 6% of ano-rectal cancers. For localized diseases, the treatment is based on radiotherapy with or without chemotherapy (5-FU and cisplatin or mitomycin), according to tumour and nodal extension. The recommended treatment dose is 45 Gy in the anal canal, the mesorectum, para-rectal lymph nodes, and inguinal lymph nodes. An additional dose of 15 to 20 Gy is delivered in the initial tumour for good responders. Salvage surgery is necessary in case of poor response. The organs at risk to be considered are bladder, femur heads, small intestine and vulva. The objective of this work is to summarize the epidemiological and radio-anatomic and prognostic characteristics of this tumour. The conformal radiotherapy technique is illustrated by a case report. (authors)

  18. Squamous cell carcinoma of the anal canal.

    LENUS (Irish Health Repository)

    Martin, F T

    2012-01-31

    Squamous cell carcinoma ofthe anal canal represents 1.5% of all malignancies affectingthe gastrointestinal tract. Over the past 20 years dramatic changes have been seen in both the epidemiological distribution of the disease and in the therapeutic modalities utilised to manage it. CLINICAL MANAGEMENT: Historically abdominoperineal resection had been the treatment of choice with local resection reserved for early stage disease. Work by Nigro et al. has revolutionised how we currently manage carcinoma of the anal canal, demonstrating combined modality chemoradiotherapy as an appropriate alternative to surgical resection with the benefit of preserving sphincter function. Surgery is then reserved for recurrent disease with salvage abdominoperineal resection. This article reviews current literature and highlights the changing therapeutic modalities with selected clinical cases

  19. The shape of the human lumbar vertebral canal A forma do canal vertebral lombar humano

    Directory of Open Access Journals (Sweden)

    Edmundo Zarzur

    1996-09-01

    Full Text Available Literature on the anatomy of the human vertebral column characterizes the shape of the lumbar vertebral canal as triangular. The purpose of the present study was to determine the precise shape of the lumbar vertebral canal. Ten lumbar vertebral columns of adult male cadavers were dissected. Two transverse sections were performed in the third lumbar vertebra. One section was performed at the level of the lower border of the ligamenta flava, and the other section was performed at the level of the pedicles. The shape of the lumbar vertebral canal at the level of the pedicles tends to be oval or circular, whereas the shape of the lumbar vertebral canal at the level of the lower border of the ligamenta flava is triangular. Thus, the shape of the human lumbar vertebral canal is not exclusively triangular, as reported in the literature. It is related to the level of the transversal section performed on the lumbar vertebra. This finding should be taken into consideration among factors involved in the spread of solutions introduced into the epidural space.A literatura sobre a anatomia da coluna vertebral descreve como sendo triangular o formato do canal vertebral na região lombar. O objetivo deste estudo é determinar a real forma do canal da coluna vertebral lombar.Dez colunas vertebrais de cadáveres de homens adultos foram dissecadas. Dois cortes transversais foram executados na terceira vértebra lombar. Um corte foi feito no nível das bordas inferiores de dois ligamentos amarelos vizinhos e o outro corte foi transversal, no nível dos pedículos. A forma do canal vertebral variou: no nível dos pedículos ela tende a ser oval ou circular e junto às bordas inferiores dos ligamentos amarelos passa a ser triangular. Portanto, a forma do canal vertebral lombar não é somente triangular; ela depende do nível em que se faz o corte transversal da vértebra. Estes achados devem ser levados em consideração entre os fatores envolvidos na difusão das

  20. Effect of two contemporary root canal sealers on root canal dentin microhardness

    Science.gov (United States)

    2017-01-01

    Background Successful root canal treatment depends on proper cleaning, disinfecting and shaping of the root canal space. Pulpless teeth have lower dentin microhardness value compared to that of vital teeth. A material which can cause change in dentin composition may affect the microhardness. Thus the aim of this study was to evaluate and compare the effect of two root canal sealers on dentin microhardness. Material and Methods Forty two single rooted teeth were selected and divided into 3 equal groups; Apexit, iRootSP and control groups (n=14) Each group was then divided into 2 subgroups according to the post evaluation period; 1 week and 2 months (n=7). Root canal procedure was done in the experimental groups and obturation was made using either; Apexit, iRootSP or left unprepared and unobturated in the control group. Roots were sectioned transversely into cervical, middle and apical segments. The three sections of each root were mounted in a plastic chuck with acrylic resin. The coronal dentin surfaces of the root segments werepolished. Microhardness of each section was measured at 500 µm and 1000 µm from the canal lumen. Results Four way-ANOVA revealed that different tested sealer materials, canal third, measuring distance from the pulp and time as independent variables had statistically non significant effect on mean microhardness values (VHN) at p≤0.001. Among iRootSP groups there was a statistically significant difference between iRoot SP at coronal root portion (87.79±17.83) and iRoot SP at apical root portion (76.26±9.33) groups where (p=0.01). IRoot SP at coronal canal third had higher statistically significant mean microhardness value (87.79±17.83) compared to Apexit at coronal third (73.61±13.47) where (p=0.01). Conclusions Root canal sealers do not affect dentin microhardness. Key words:Root canal, dentin, sealers, microhardness, bioceramic. PMID:28149466

  1. Lesions in the external auditory canal

    Directory of Open Access Journals (Sweden)

    Priyank S Chatra

    2011-01-01

    Full Text Available The external auditory canal is an S- shaped osseo-cartilaginous structure that extends from the auricle to the tympanic membrane. Congenital, inflammatory, neoplastic, and traumatic lesions can affect the EAC. High-resolution CT is well suited for the evaluation of the temporal bone, which has a complex anatomy with multiple small structures. In this study, we describe the various lesions affecting the EAC.

  2. Carotid canal dehiscence in the human skull

    Energy Technology Data Exchange (ETDEWEB)

    Pastor Vazquez, J.F.; Gil Verona, J.A. [Department of Anatomy, Faculty of Medicine, University of Valladolid, Ramon y Cajal, 7, E-47005 Valladolid (Spain); Garcia Porrero, M. [Department of Radiology, Faculty of Medicine, University of Valladolid (Spain)

    1999-06-01

    Abnormalities of the floor of the carotid canal have been studied in 538 skulls. These abnormalities range from a fissure to total absence of the floor. This variation may be caused by abnormalities of the internal carotid artery or deficiencies in ossification of the skull base. CT suggests that these changes should be taken into account by surgeons working on the skull base. (orig.) With 4 figs., 8 refs.

  3. Splendid Culture on the Grand Canal

    Institute of Scientific and Technical Information of China (English)

    1993-01-01

    JINING Prefecture on thesouthwest plain of ShandongProvince is known as the homeof Confucius and Mencins and theland of etiquette.It is famous as thebirthplace or residence of many out-standing people and has beautifulscenery with blue Weishan Lake tothe south,lofty Mount Tai to thenorth and Liang Mountain by thelake in the west.The Beijing-Hangzhor Grand Canal crosses theprefecture,which has been a com-munications hub between north andsouth China since the Ming

  4. Koebner phenomenon of the ear canal skin.

    LENUS (Irish Health Repository)

    Young, O

    2009-02-01

    The Koebner phenomenon originally described the appearance of psoriatic lesions in the uninvolved skin of patients with psoriasis as a consequence of trauma. We describe a case of concurrent lichen planus and sarcoidosis in the auditory canal, which represents an unusual manifestation of the Koebner phenomenon. This is the first case of concurrent lichen planus and sarcoidosis in the head and neck region and highlights the need for biopsy to allow accurate histopathological diagnosis and treatment.

  5. Koebner phenomenon of the ear canal skin.

    LENUS (Irish Health Repository)

    Young, O

    2012-02-01

    The Koebner phenomenon originally described the appearance of psoriatic lesions in the uninvolved skin of patients with psoriasis as a consequence of trauma. We describe a case of concurrent lichen planus and sarcoidosis in the auditory canal, which represents an unusual manifestation of the Koebner phenomenon. This is the first case of concurrent lichen planus and sarcoidosis in the head and neck region and highlights the need for biopsy to allow accurate histopathological diagnosis and treatment.

  6. Root canal filling using Resilon: a review.

    LENUS (Irish Health Repository)

    Shanahan, D J

    2011-07-01

    Root canal treatment is achieved by chemo-mechanical debridement of the root canal system followed by filling. The filling material \\'entombs\\' residual bacteria and acts as a barrier which prevents the entrance of oral microorganisms and reinfection of the root canal system through microleakage. However, filling with contemporary root filling materials such as gutta-percha offers limited long-term resistance to microorganisms; as a result other materials such as Resilon have been investigated as alternatives. The aim of this review was to analyse the literature to consider whether Resilon is a suitable root canal filling material. A MEDLINE and Cochrane library search including various keyword searches identified several papers which investigated or discussed Resilon or RealSeal\\/Epiphany. Analysis of the literature demonstrated that the bulk of the literature is in vitro in nature, based largely on leakage-type studies, and demonstrates a wide variety of methodologies with conflicting findings; as a result meaningful conclusions are difficult. Within the limit of these in vitro studies Resilon appears to perform adequately in comparison to gutta-percha, however, as a result of the questionable merit of such studies, it cannot presently be considered an evidence-based alternative to the current gold standard gutta-percha. It is imperative that before Resilon is considered as a replacement material, a better understanding of the physical properties of the resin sealer and the reality of the adhesive \\'monoblock\\' are elucidated. The literature also demonstrates a paucity of quality long-term clinical outcome studies which will need to be addressed before firm conclusions can be reached.

  7. Antibacterial effect of root canal preparation and calcium hydroxide paste (Calen intracanal dressing in primary teeth with apical periodontitis Efeito antibacteriano do preparo biomecânico e do curativo de demora com pasta à base de hidróxido de cálcio (Calen em dentes decíduos com lesão periapical

    Directory of Open Access Journals (Sweden)

    Gisele Faria

    2005-12-01

    Full Text Available The aim of this study was to evaluate the antibacterial action of root canal mechanical preparation using 2.5% sodium hypochlorite as the irrigating solution and a calcium hydroxide paste as the antibacterial intracanal dressing in human primary teeth root canals with pulp necrosis and apical periodontitis by means of microbial culture. A total of 26 root canals of human primary teeth with pulp necrosis and apical periodontitis were used. Samples were collected before, 72h after biomechanical treatment and 72h after removal of the intracanal dressing. Comparison by Wilcoxon test showed that root canal mechanical preparation effectively eliminated all microorganisms in 20% of the root canals, and the intracanal dressing in 62.5%; however, the cumulative action of biomechanical treatment and intracanal dressing eliminated the microorganisms of 70% of the root canals (pO objetivo do presente estudo foi avaliar, por meio de cultura bacteriológica, a ação antibacteriana do preparo biomecânico utilizando como solução irrigadora o hipoclorito de sódio a 2,5% e da pasta Calen utilizada como curativo de demora em canais radiculares de dentes decíduos de humanos com necrose pulpar e lesão periapical. Foram selecionados 26 dentes decíduos de humanos portadores de necrose pulpar e lesão periapical. As colheitas microbiológicas foram efetuadas antes e 72 horas após o preparo biomecânico e 72 horas após a remoção do curativo de demora. A comparação por meio do teste de Wilcoxon mostrou que o preparo biomecânico foi eficaz na eliminação dos microrganismos dos canais radiculares em 20% dos casos e o curativo de demora em 62,5%, enquanto que a ação cumulativa do preparo biomecânico e do curativo de demora eliminou os microrganismos em 70,0% dos casos (p<0.001. Pôde-se concluir que o preparo biomecânico, isoladamente, apresentou resultados microbiológicos inferiores àqueles obtidos quando o mesmo foi associado ao curativo de demora

  8. Recobrimento de múltiplas recessões com enxerto subepitelial: tratamento de descontaminação da superfície radicular com laser de Erbium YAG

    OpenAIRE

    Kina, José Ricardo; Suzuki, Thaís Yumi Umeda [UNESP; Kina, Eunice Fumico Umeda [UNESP

    2014-01-01

    Multiple gingival recessions may cause mainly dentinary sensibility and aesthetic alterations. The subepithelial graft is a mucogingival technique which can be used to treat multiple gingival recessions. In this case report the Erbium YAG laser was applied to promote radicular surface decontamination, an important step to reach reinsertion of the gingival tissues on exposed radicular surface. Las recesiones gingivales múltiples, pueden provocar sensibilidad dentinaria y alteraciones estéti...

  9. A Novel Approach for Treatment of an Unusual Presentation of Radicular Cysts Using Autologous Periosteum and Platelet-Rich Fibrin in Combination with Demineralized Freeze-Dried Bone Allograft

    Directory of Open Access Journals (Sweden)

    Veena A. Patil

    2013-01-01

    Full Text Available Radicular cysts are the most common cystic lesions affecting the jaws. They are most commonly found at the apices of the involved teeth. This condition is usually asymptomatic but can result in a slow-growth tumefaction in the affected region. The following case report presents the successful treatment of radicular cysts using autologous periosteum and platelet-rich fibrin with demineralized freeze-dried bone allograft.

  10. Defining the Location of the Adductor Canal Using Ultrasound

    DEFF Research Database (Denmark)

    Wong, Wan Yi; Bjørn, Siska; Strid, Jennie Maria Christin;

    2016-01-01

    BACKGROUND AND OBJECTIVES: The precise location of the adductor canal remains controversial among anesthesiologists. In numerous studies of the analgesic effect of the so-called adductor canal block for total knee arthroplasty, the needle insertion point has been the midpoint of the thigh......, determined as the midpoint between the anterior superior iliac spine and base of patella. "Adductor canal block" may be a misnomer for an approach that is actually an injection into the femoral triangle, a "femoral triangle block." This block probably has a different analgesic effect compared...... with an injection into the adductor canal. We sought to determine the exact location of the adductor canal using ultrasound and relate it to the midpoint of the thigh. METHODS: Twenty-two volunteers were examined using ultrasound. The proximal end of the adductor canal was identified where the medial border...

  11. Endodontic management of a maxillary second premolar with an S-shaped root canal

    Directory of Open Access Journals (Sweden)

    Reuben Joseph

    2008-01-01

    Full Text Available Complex and unusual root canal morphology is an often occurring phenomenon. Understanding the unusual root canal morphology contributes to success in endodontic treatment. One such variant root canal morphology is the ′S′ shaped or bayonet shaped root canal. This case report discusses endodontic treatment of a maxillary second premolar with an ′S′ shaped root canal.

  12. Geophysical investigation of a dutch levee and canal using various seismic and GPR techniques

    NARCIS (Netherlands)

    Noorlandt, R.P.; Kleine, M.P.E. de; Kruiver, P.P.; Bakker, M.A.J.; Mesdag, C.S.; Hoogendoorn, R.M.

    2011-01-01

    A geophysical survey has been carried out on the Juliana Canal and levee in the south of the Netherlands. For a stretch of about 35 km along this canal various construction works are planned, to deepen and widen the canal. The canal is in a geological setting such that leakage from the canal to the

  13. Ring canals in the ovarian follicles of Aedes aegypti

    Energy Technology Data Exchange (ETDEWEB)

    Mathew, G.; Rai, K.S.

    1976-07-01

    In the ovarian follicles of Aedes aegypti, the oocyte develops from 1 of 8 interconnected cystocytes. The cytoplasmic interconnections, the ring canals, have an electron dense rim in which are embedded an array of parallel filaments. The ring canal in presumptive follicle is generally devoid of organelles, while that in the more advanced secondary follicle encloses ribosomes, vesicles and mitochondria. Ring canals may furnish a means for the transfer of materials including ribosomes and mitochondria from nurse cells to the oocyte.

  14. Endodontic Considerations in Three-canalled Premolars: A Practical Update

    Science.gov (United States)

    Mohammadi, Zahed; Shalavi, Sousan; Giardino, Luciano; Asgary, Saeed

    2016-01-01

    The most difficult clinical considertions in orthograde root canal treatment are generally related to the anatomy of the teeth. Three-canalled maxillary and mandibular premolars (mini-molars) have been reported in several studies. The purpose of this paper was to review various aspects of three-canalled premolars including incidence, clinical and radiographic diagnosis, racial predisposition, access cavity preparation, instrumentation and obturation. PMID:27141223

  15. Three root canals in the maxillary second premolar

    Directory of Open Access Journals (Sweden)

    de Almeida-Gomes Fabio

    2009-01-01

    Full Text Available In this study, we report an endodontic treatment of the maxillary second premolar with three root canals and distinct foramens. The possibility of three root canals in this tooth is quite small; however, it must be taken into account in clinical and radiographic evaluation during endodontic treatment. Many times, their presence is noticed only after canal treatment due to continuing post-operative discomfort.

  16. Combined intra-extracanal approach to lumbosacral disc herniations with bi-radicular involvement. Technical considerations from a surgical series of 15 cases.

    Science.gov (United States)

    Paolini, Sergio; Ciappetta, Pasquale; Raco, Antonino; Missori, Paolo; Delfini, Roberto

    2006-05-01

    Large lumbosacral disc herniations effacing both the paramedian and the foraminal area often cause double radicular compression. Surgical management of these lesions may be difficult. A traditional interlaminar approach usually brings into view only the paramedian portion of the intervertebral disc, unless the lateral bone removal is considerably increased. Conversely, the numerous far-lateral approaches proposed for removing foraminal or extraforaminal disc herniations would decompress the exiting nerve root only. Overall, these approaches share the drawback of controlling the neuroforamen on one side alone. A combined intra-extraforaminal exposure is a useful yet rarely reported approach. Over a 3-year period, 15 patients with bi-radicular symptoms due to large disc herniations of the lumbar spine underwent surgery through a combined intra-extracanal approach. A standard medial exposure with an almost complete hemilaminectomy of the upper vertebra was combined with an extraforaminal exposure, achieved by minimal drilling of the inferior facet joint, the lateral border of the pars interarticularis and the inferior margin of the superior transverse process. The herniated discs were removed using key maneuvers made feasible by working simultaneously on both operative windows. In all cases the disc herniation could be completely removed, thus decompressing both nerve roots. Radicular pain was fully relieved without procedure-related morbidity. The intra-extraforaminal exposure was particularly useful in identifying the extraforaminal nerve root early. Early identification was especially advantageous when periradicular scar tissue hid the nerve root from view, as it did in patients who had undergone previous surgery at the same site or had long-standing radicular symptoms. Controlling the foramen on both sides also reduced the risk of leaving residual disc fragments. A curved probe was used to push the disc material outside the foramen. In conclusion, specific

  17. Atividade radicular da soja: definição de um método Soybean root activity: methodology definition

    Directory of Open Access Journals (Sweden)

    Ana Paula Encide-Olibone

    2008-04-01

    Full Text Available As técnicas de estudo radicular são trabalhosas e, dentre os métodos mais utilizados no Brasil, destacam-se a trincheira ou parede do perfil, blocos ou monólito, placa com pregos e trado. Essas técnicas utilizam amostragem destrutiva e direta das raízes. Com o objetivo de adaptar um método de avaliação da atividade radicular da cultura da soja utilizando nitrato de rubídio (RbNO3, realizou-se um experimento em Botucatu - SP. O experimento constituiu-se de duas etapas, sendo uma em campo e outra em casa de vegetação. Plantas de soja foram cultivadas em vasos de 15 dm³ de amostras de Nitossolo Vermelho em casa de vegetação. Aos 25 DAE, aplicaram-se 3 mL de solução de RbNO3 nas doses de 0,0; 0,5; 1,0; e 2,0 mg dm-3 de Rb, à 0,05 m de profundidade no centro de cada vaso. A parte aérea das plantas foi coletada e separada em caule + pecíolo e limbo foliar aos dois, quatro e seis dias depois da aplicação de RbNO3. Em campo, aplicaram-se 3 mL de RbNO3 (1,0 mg dm-3 de Rb em diferentes distâncias da planta (0,075, 0,15 e 0,225 m e nas profundidades de 0,05; 0,10; 0,20; 0,40; e 0,60 m. A parte aérea das plantas foi coletada quatro dias depois da aplicação de RbNO3. A soja não apresentou fitotoxicidade ao RbNO3, o que foi eficiente na determinação da atividade radicular da cultura.Root study techniques are labor intensive. Among the most frequently used methods are the trench or profile wall, block or monolith, needle board and hand auger. These techniques use destructive and direct root sampling. With the objective of adapting an evaluation methodology of soybean root activity based on Rubidium Nitrate, an experiment was carried out in Botucatu, SP, Brazil, in two phases; one in the field and the other in a greenhouse. Soybean plants were grown in 15 L pots. 25 DAE, 3 mL of Rubidium Nitrate solution was applied at 0; 0.5; 1.0 and 2.0 mg dm-3, at a depth of 0.05 m in the middle of each pot. The plants shoot was collected and

  18. Densidade do solo, atributos químicos e sistema radicular do milho afetados pelo pastejo e manejo do solo

    Directory of Open Access Journals (Sweden)

    V. R. Silva

    2000-03-01

    Full Text Available A integração lavoura-pecuária é uma alternativa de renda dos produtores no sul do Brasil. Entretanto, o pisoteio animal e, ou, o preparo de solo podem compactá-lo, prejudicando o crescimento radicular e a produtividade das plantas. Estudaram-se os efeitos do pisoteio animal em regime de pastejo contínuo durante o inverno/primavera e do impacto do plantio direto e do preparo convencional de solo no estado de compactação, atributos químicos e distribuição radicular. Em Podzólico Vermelho-Amarelo de textura superficial franca, foi implantada uma pastagem de estação fria composta por aveia (Avena strigosa Schreb e azevém (Lolium multiflorum L.. A carga animal variou conforme o crescimento da pastagem. Em dezembro de 1996, foi implantada a cultura do milho (Zea mays L. para a produção de silagem, usando os seguintes tratamentos: plantio direto na área não pastejada, plantio direto após o pastejo, preparo convencional de solo na área não pastejada e preparo convencional de solo após pastejo. As avaliações apresentadas neste estudo são referentes ao terceiro ano de cultivo, no qual houve um período de pastejo de 107 dias. Aos 45 dias da emergência do milho, foram abertas trincheiras (100 x 40 cm para visualizar a distribuição do sistema radicular e coletar amostras de solo, a cada 5 cm, para caracterização química e determinação da densidade do solo e de raízes. Ao longo do perfil (0-40 cm, o desenho da distribuição de raízes indicou maior quantidade de raízes no preparo convencional de solo, concordando com os resultados de densidade de raízes. O pisoteio animal não teve efeito sobre as características físicas, possivelmente pelo fato de o resíduo da pastagem permanecer próximo a 1,0 Mg ha-1 de matéria seca. A densidade do solo no plantio direto, na camada de 5-10 cm, foi de 1,41 Mg m-3, tanto na área pastejada como na não pastejada. No preparo convencional de solo, esses valores foram de 1,15 Mg m-3

  19. Germinação de sementes e crescimento de plântulas de soja (Glycine max L. Merrill sob cobertura vegetal = Soybean (Glycine max L. Merrill seed germination and plantlet growth under vegetation cover

    Directory of Open Access Journals (Sweden)

    Lúcia Helena Pereira Nóbrega

    2009-07-01

    Full Text Available A eficiência do sistema de rotação de cultura requer, entre outrostratamentos, a escolha adequada das espécies a serem instaladas. Culturas vegetais podem apresentar compostos aleloquímicos, os quais são liberados por meio de pelos radiculares, sementes, raízes, colmos e folhas, em quantidades variáveis, capazes de interferir nas culturas subsequentes, comprometendo a produção. Assim, este estudoanalisou o potencial alelopático de aveia-preta (Avena strigosa Schreb (AP, nabo forrageiro (Raphanus sativus L. (NF, ervilhaca (Vicia sativa L. (ER, azevém (Lolium multiflorum Lam. (AZ e consórcio (CO - AP+ER+NF na germinação de sementes e crescimento de plântulas de soja. O experimento foi em laboratório, com substrato deareia, onde foram cultivadas plantas de cobertura, por 30 dias, mantendo os restos radiculares das plantas com e sem restos de parte aérea. Observou-se redução na emergência de plântulas de soja sob CO, AZ e AP. O índice de velocidade de emergência (IVE, a porcentagem de emergência em areia (EA e a massa fresca de hipocótilo (MFH foram afetados negativamente pelas plantas de cobertura.In order to be efficient, the crop rotation system requires, among other factors, an adequate choice of species to be installed. Vegetalcultures can feature allelochemical compounds, released by root hairs, roots, stems and leaves in variable amounts, which are able to interfere on subsequent cultures, as well as cause a delay in their production. Thus, this study analyzed the allelopathic potentialof black oat (Avena strigosa Schreb (BO, forage turnip (Raphanus sativus L. (FT, vetch (Vicia sativa L. (V, ryegrass (Lolium multiflorum Lam. (RG and consortium (CO - BO+V+FT on soybean seed germination and plantlet growth. This trial was carried out in a laboratory, with sand substrate, where coverage plants were grown, during 30 days. The remaining root portions of plants were kept with and without the remaining aerial part portions

  20. [First guidelines of Croatian interest group in diagnosing and treating lower back and radicular pain using minimally invasive diagnostic and therapeutic procedures].

    Science.gov (United States)

    Houra, Karlo; Perović, Darko; Kvesić, Drazen; Rados, Ivan; Kovac, Damir; Kapural, Leonardo

    2013-01-01

    Low back and radicular pain recently became a major public health problem. Medical expenses in general, and surgical procedures associated with overall care for the lower back pain are high and growing. Furthermore, these two chronic pain conditions are also leading causes for missed workdays. Degenerative changes of the intervertebral disc, facet joints, sacroiliac joint or disc herniation as described during imaging diagnostics may or may not be the cause of patients' lower back pain. Diagnostic blocks often precede further interventions in order to confirm or dispute a source of the lower back pain. Chronic lower back pain caused by painful intervertebral disc should be treated using biacuplasty. If the pain of the lumbar spine is caused by facet joints or sacroiliac joint, patient can be offered neuroablative procedures using radiofrequency. In cases where the low back and radicular pain are caused by the central and foraminal spinal stenosis patients are advised epidural steroid injections, unless claudications are present. Patients suffering from the chronic radicular pain may be treated with various nucleoplasty procedures or they may be offered percutaneous radiofrequent neuromodulation. The purpose of above advised procedures is to relieve patients' pain, allow optimal physical therapy, and improved functional capacity, consequently providing better quality of life.

  1. Qualidade de um solo sob diferentes usos e sob Cerrado nativo Soil quality under different uses and native Cerrado

    Directory of Open Access Journals (Sweden)

    Ricardo Araújo

    2007-10-01

    Full Text Available O uso sustentável do solo tem-se constituído em tema de crescente relevância, em face do aumento das atividades antrópicas. Com o objetivo de avaliar a qualidade do solo em área de Cerrado nativo e em áreas sob diferentes usos, foram amostradas camadas de Latossolo Vermelho-Amarelo sob quatro tipos de ocupação: pastagem natural, pastagem cultivada, cultivo convencional com culturas anuais e florestamento de pínus. As áreas estão localizadas na Fazenda Água Limpa, DF. Foram avaliados os seguintes atributos de qualidade do solo: densidade do solo, resistência mecânica à penetração, taxa de infiltração de água, teor de matéria orgânica, capacidade de troca catiônica, C total da biomassa microbiana e respiração basal. Com base nos dados obtidos, foi organizado um diagrama comparativo e calculado um índice da qualidade do solo para cada tipo de uso. Os resultados evidenciaram relação estreita e inversa entre a qualidade do solo e a intensidade de uso a que as áreas foram submetidas. Mediante análise desses atributos e da elaboração de um modelo comparativo, foi possível avaliar o nível de degradação do solo em função do uso de cada área.Sustainable soil use is becoming increasingly relevant given the increase of anthropic activities. In order to evaluate the soil quality, soil samples were collected from five areas: natural Cerrado (reference, native pasture, planted pasture, annual crops under conventional tillage and pine forest. The areas are located in the Federal District, Brazil, in a clayey Red Yellow Latosol (Acrustox. The following soil quality attributes were measured: bulk density, mechanical resistance to penetration, water infiltration rate, organic matter content, cation exchange capacity, carbon of microbial biomass and basal respiration. Based on the obtained data a comparative diagram was drawn and a soil quality index calculated for each type of use. The results showed a close inverse

  2. Assessment of trace metal contamination in a historical freshwater canal (Buckingham Canal), Chennai, India.

    Science.gov (United States)

    Jayaprakash, M; Nagarajan, R; Velmurugan, P M; Sathiyamoorthy, J; Krishnamurthy, R R; Urban, B

    2012-12-01

    The present study was done to assess the sources and the major processes controlling the trace metal distribution in sediments of Buckingham Canal. Based on the observed geochemical variations, the sediments are grouped as South Buckingham Canal and North Buckingham Canal sediments (SBC and NBC, respectively). SBC sediments show enrichment in Fe, Ti, Mn, Cr, V, Mo, and As concentrations, while NBC sediments show enrichment in Sn, Cu, Pb, Zn, Ni, and Hg. The calculated Chemical Index of Alteration and Chemical Index of Weathering values for all the sediments are relatively higher than the North American Shale Composite and Upper Continental Crust but similar to Post-Archaean Average Shale, and suggest a source area with moderate weathering. Overall, SBC sediments are highly enriched in Mo, Zn, Cu, and Hg (geoaccumulation index (I(geo)) class 4-6), whereas NBC sediments are enriched in Sn, Cu, Zn, and Hg (I(geo) class 4-6). Cu, Ni, and Cr show higher than Effects-Range Median values and hence the biological adverse effect of these metals is 20%; Zn, which accounts for 50%, in the NBC sediments, has a more biological adverse effect than other metals found in these sediments. The calculated I(geo), Enrichment Factor, and Contamination Factor values indicate that Mo, Hg, Sn, Cu, and Zn are highly enriched in the Buckingham Canal sediments, suggesting the rapid urban and industrial development of Chennai Metropolitan City have negatively influenced on the surrounding aquatic ecosystem.

  3. Three distal root canals in mandibular first molar with different canal configurations: Report of two cases and literature review

    Directory of Open Access Journals (Sweden)

    Parul Bansal

    2015-01-01

    Full Text Available With the increasing number of reports of aberrant root canal morphology, the clinician needs to be aware of the variable anatomy. Various case reports have been published with the finding of middle mesial canal in mandibular first molar, however finding of three distal canals in distal roots of mandibular first molar is rare. This article reports endodontic management of two mandibular first molars presented with three distal canals present in a single distal root (Sert and Bayirli type XVIII and distal and distolingual root.

  4. Large small cell carcinoma of anorectal canal.

    Science.gov (United States)

    Ghahramani, Leila; Mohammadianpanah, Mohammad; Hosseini, Seyed Vahid; Hosseinzade, Masood; Izadpanah, Ahmad; Ebrahimian, Saba; Bananzadeh, Alimohammad

    2014-03-01

    Neurofibromatosis type-1 (NF1), also known as Von Recklinghausen disease, is an autosomal dominant disorder with incidence of one per 4000. Neurofibromas are benign, heterogeneous, peripheral nerve sheath tumors coming up from the connective tissue of peripheral nerve sheaths, particularly the endoneurium. Visceral involvement in disseminated neurofibromatosis is considered rare. Neurofibroma occurs most frequently in the stomach and jejunum, but colon and anorectal canal may also be involved. Gastrointestinal neurofibromas may lead to bleeding, obstruction, intussusception, protein-losing enteropathy and bowel perforation. We encountered a case of diffusely involving the anorectal area by huge neurofibroma, which resulted in pelvic pain with watery diarrhea and urgency.

  5. Suez Canal Clearance Operation, Task Force 65

    Science.gov (United States)

    1975-05-01

    and remove the four wrecks from the central region of the canal; DREDGE 23, Tug MONGUED, Dredge KASSER and a Concrete Caisson. All salvage operations...feet BUCKET DREDGE NO. 23 72.00 1600 tons 191 feet TUG MONGUED 81.50 1200 tons 165 feet DIPPER DREDGE KASSER 81.50 1200 tons 125 feet CONCRETE CAISSON...MONGUED, DREDGE KASSER , and DREDGE 23 to wet dump in the Great Bitter Lake. Heavy crane THOR arrived in Port Said after transit from Hamburg, Germany

  6. CANALES (2) [Material gráfico

    OpenAIRE

    Fundación para la Etnografía y el Desarrollo de la Artesanía Canaria

    1990-01-01

    ALGUNAS PIEDRAS CAIDAS. SEDIMENTACION. Antiguedad: SIGLO XX CONSTRUCCION DE ARENA, CAL Y PIEDRAS REDONDEADAS. CON RIPIOS POR TODAS PARTES. EN SECTORES HAY PAREDES DE HASTA 4 MTS. DE ALTO PARA SALVAR EL DESNIVEL. UN METRO DE ANCHO DEL CANAL Y 0`5 MTS. LA COBERTURA DEL MISMO. Calificación del suelo: RÚSTICO DE PROTECCIÓN NATURAL Clasificación del suelo: RÚSTICO Declaración BIC:No LA OTRA ACEQUIA QUE CIRCULA POR LA PARTE SUPERIOR ESTA MAS DETERIORADA. VAN A 10 MTS. DE SEPARACIO...

  7. CAVERNOUS HEMANGIOMA OF THE INTERNAL AUDITORY CANAL

    Directory of Open Access Journals (Sweden)

    Mohammad Hossein Hekmatara

    1993-06-01

    Full Text Available Cavernous hemangioma is a rare benign tumor of the internal auditory canal (IAC of which fourteen cases have been reported so far."nTinnitus and progressive sensorineural hearing loss (SNHL are the chief complaints of the patients. Audiological and radiological planes, CTScan, and magnetic resonance image (MRI studies are helpful in diagnosis. The only choice of treatment is surgery with elective transmastoid trans¬labyrinthine approach. And if tumor is very large, the method of choice will be retrosigmoid approach.

  8. Cancer incidence in the Love Canal area.

    Science.gov (United States)

    Janerich, D T; Burnett, W S; Feck, G; Hoff, M; Nasca, P; Polednak, A P; Greenwald, P; Vianna, N

    1981-06-19

    Data from the New York Cancer Registry show no evidence for higher cancer rates associated with residence near the Love Canal toxic waste burial site in comparison with the entire state outside of New York City. Rates of liver cancer, lymphoma, and leukemia, which were selected for special attention, were not consistently elevated. Among the other cancers studied, a higher rate was noted only for respiratory cancer, but it was not consistent across age groups and appeared to be related to a high rate for the entire city of Niagara Falls. There was no evidence that the lung cancer rate was associated with the toxic wastes buried at the dump site.

  9. Revestimientos especiales para diques y canales

    Directory of Open Access Journals (Sweden)

    Zorzi, Silvano

    1964-11-01

    Full Text Available This paper summarizes the possibilities and advantages of adopting special facings for dykes and canals, and generally for all large hydraulic works, where waterproofing is of paramount importance. Technical advances in recent years have made it possible to prefabricate many facing units used in these types of works; large slabs, made in reinforced and prestressed concrete, are flexible, and watertight. Although there are many possibilities and types of facing treatments, the one described here is outstanding. It consists of narrow slabs, highly flexible, placed transversally with respect to the canal axis. They are attached with cement mortar, and the joints are finally sealed with a special mortar, called «Emboco». In this article a description is also given of a series of projects, where facing treatments have been used, which are now successfully in service. Finally some general and simple advise is given on the best procedure to apply these facing treatments in the most effective and economic manner.En este trabajo se resumen las posibilidades y ventajas que ofrecen los revestimientos especiales de diques y taludes de canales y, en general, en todas las grandes obras hidráulicas, en que la impermeabilización es de mayor importancia al tratar de conservar los caudales iniciales o la retención de aguas embalsadas, según los casos. Los progresos de las técnicas modernas, en particular la prefabricación, han permitido este tipo de revestimientos con losas de gran longitud, extremadamente flexibles e impermeables, de hormigón armado y pretensado. Aunque son muchas las posibilidades y tipos de revestimiento, destaca el que a continuación se expone: consiste en placas o losas estrechas, de gran flexibilidad, colocadas transversalmente al eje del canal sobre tongadas de mortero de cemento, y cuyas juntas se sellan, finalmente, con un mortero especial llamado «Emboco». Complementan la exposición teórica del método una serie de

  10. Water Environment Evolution along the China Grand Canal

    Science.gov (United States)

    Mao, F.; Wu, Y. X.; Yang, B. F.; Li, X. J.

    2014-03-01

    The China Grand Canal is one of the earliest canals in the world, having lasted for nearly 3000 years. Even its section canals have a rich history, such as the North-South Grand Canal that was established during the Sui Dynasty, whereas the Beijing-Hangzhou Canal was excavated during the Yuan Dynasty and the east line of the South-to-North Water Diversion. As one of the longest in the world, the China Grand Canal's total length is over 3500 kilometers. This length includes the navigable, unnavigable, and underground sections. Making the best use of situations and according to local conditions, the Chinese people harmoniously constructed the Beijing-Hangzhou Canal with nature. Tens of millions of workers took nearly 3000 years to complete the great shipping system. Navigable sections still exist for up to 900 kilometers and the volume of freight traffic is approximately 300 million tons. The canal remains the main logistical channel of the North-to-South Coal Transportation, South-to-North Water Diversion, and resources circulation. To date, China is promoting the success of heritage application. Part of these efforts is the declaration of the China Grand Canal as a World Cultural Heritage by 2014. In addition, the east route of the South-to-North Water Transfer project is planned to be navigable by 2016. The ancient Beijing-Hangzhou Grand Canal will usher in the new ecological civilization and cultural revival along the canal. This paper presents technical methods of water environment evolution research on the river system, river, and water quality along the Beijing-Hangzhou Canal through the integration of historical literature and modern remote sensing image data. The study carried out water environment investigation and analysis along the Beijing-Hangzhou canal by using ETM, SPOT image data, and GPS measurement data. Spatial and temporal evolution characteristics and regulations of the Beijing-Hangzhou Grand Canal regional water environment in the span of 3000

  11. Root canal treatment of mandibular second premolar tooth with taurodontism

    Directory of Open Access Journals (Sweden)

    Vujašković Mirjana

    2008-01-01

    Full Text Available INTRODUCTION Taurodontism is a morphoanatomical change in the shape of a tooth. An enlarged body of a tooth with smaller than usual roots is a characteristic feature. Internal tooth anatomy correlates with this appearance, which means that a taurodontal tooth has a large pulp chamber and apically positioned furcations. This dental anomaly may be associated with different syndromes and congenital discoders. CASE OUTLINE The case report presents the patient of a rare case of taurodontism in the mandibular second premolar with chronic periodontitis. Endodontic treatment was performed after dental history and clinical examination. Special care is required in all segments of endodontic treatment of a taurodontal tooth from the identification orifice, canal exploration, determining working length, cleaning and shaping and obturation of the root canal. Precurved K-file was used for canal exploration and location of the furcation. One mesial and one distal canal with the buccal position were identified in the apical third of the root canal. The working lengths of two canals were determined by radiographic interpretation with two K-files in each canal and verified with the apex locator. During canal instrumentation, the third canal was located in the disto-lingual position. The working length of the third canal was established using the apex locator. CONCLUSION Thorough knowledge of tooth anatomy and its variations can lead to lower percentage of endodontic failure. Each clinical case involving these teeth should be investigated carefully, clinically and radiographically to detect additional root canals. High quality radiographs from different angles and proper instrumentarium improve the quality of endodontic procedure.

  12. Assessing the effectiveness of ‘pulse radiofrequency treatment of dorsal root ganglion’ in patients with chronic lumbar radicular pain: study protocol for a randomized control trial

    Directory of Open Access Journals (Sweden)

    Shanthanna Harsha

    2012-04-01

    Full Text Available Abstract Background Chronic lumbar radicular pain can be described as neuropathic pain along the distribution of a particular nerve root. The dorsal root ganglion has been implicated in its pathogenesis by giving rise to abnormal impulse generation as a result of irritation, direct compression and sensitization. Chronic lumbar radicular pain is commonly treated with medications, physiotherapy and epidural steroid injections. Epidural steroid injections are associated with several common and rarer side effects such as spinal cord infarction and death. It is essential and advantageous to look for alternate interventions which could be effective with fewer side effects. Pulse radio frequency is a relatively new technique and is less destructive then conventional radiofrequency. Safety and effectiveness of pulse radio frequency in neuropathic pain has been demonstrated in animal and humans studies. Although its effects on dorsal root ganglion have been studied in animals there is only one randomized control trial in literature demonstrating its effectiveness in cervical radicular pain and none in lumbar radicular pain. Our primary objective is to study the feasibility of a larger trial in terms of recruitment and methodology. Secondary objectives are to compare the treatment effects and side effects. Methods/designs This is a single-center, parallel, placebo-controlled, triple-blinded (patients, care-givers, and outcome assessors, randomized control trial. Participants will have a history of chronic lumbar radicular pain for at least 4 months in duration. Once randomized, all patients will have an intervention involving fluoroscopy guided needle placement to appropriate dorsal root ganglion. After test stimulation in both groups; the study group will have a pulse radio frequency treatment at 42°C for 120 s to the dorsal root ganglion, with the control group having only low intensity test stimulation for the same duration. Primary outcome is to

  13. Benign Paroxysmal Positional Vertigo with Simultaneous Involvement of Multiple Semicircular Canals

    OpenAIRE

    Shim, Dae Bo; Song, Chang Eun; Jung, Eun Jung; Ko, Kyung Min; Park, Jin Woo; Song, Mee Hyun

    2014-01-01

    Background and Objectives Benign paroxysmal positional vertigo (BPPV) generally involves a single semicircular canal (single canal BPPV) but it has been reported that more than one semicircular canal on either the same or the opposite side can be involved in 6.8-20% of the cases (multiple canal BPPV). In this study, the clinical characteristics of multiple canal BPPV were analyzed and compared to those of single canal BPPV. Materials and Methods Retrospective analysis was performed on 1054 co...

  14. Canal switch after canalith repositioning procedure for benign paroxysmal positional vertigo.

    Science.gov (United States)

    Lin, Giant C; Basura, Gregory J; Wong, Hiu Tung; Heidenreich, Katherine D

    2012-09-01

    Canal switch is a complication following canalith repositioning procedure (CRP) for posterior canal benign paroxysmal positional vertigo (BPPV). Instead of being returned to the utricle, the loose otoconia migrate into the superior or horizontal semicircular canal. Patients remain symptomatic, and treatment can be ineffective unless the switch is recognized and additional repositioning maneuvers directed toward the appropriate semicircular canal are performed. This report provides the first videographic documentation of canal switch involving conversion of unilateral posterior semicircular canal BPPV to geotropic horizontal canalithiasis.

  15. Visibility of the central canal on MRI

    Energy Technology Data Exchange (ETDEWEB)

    Petit-Lacour, M.C.; Lasjaunias, P.; Iffenecker, C.; Benoudiba, F.; Hadj Rabia, M.; Doyon, D. [Service de Neuroradiologie, Faculte de Paris Sud (France); Hurth, M. [Department of Neurosurgery, Faculte Paris Sud, Kremlin-Bicetre (France)

    2000-10-01

    The central canal of the spinal cord is present at birth and becomes progressively obliterated. Cadaver studies have shown that it may persiste partially or completely. To our knowledge, this entity has not been described on MRI. We reviewed 794 MRI studies of the spinal cord, and found 12 patients (aged 14 to 65 years) who had an intramedullary cavity. The cavity was at the junction of the ventral {sup 1}/{sub 3} and dorsal {sup 2}/{sub 3} of the spinal cord, except at the level of the lumbar enlargement, where it was central. It was filiform in most cases, although sometimes fusiform (3 to 4 mm in diameter), and had regular contours. The cavity were thoracic in 69 % of cases. The clinical features were totally unrelated to the image, and there were no anatomical factors (Chiari malformation, dysraphism) predisposing to syringomyelia. The images were perfectly compatible with a persistent central canal, which we interpret as a variant of normal anatomy. Therefore it is important to regard these findings as normal, to avoid unnecessary treatment and follow-up. (orig.)

  16. Root canals-from concretion to patency

    Directory of Open Access Journals (Sweden)

    Chandrakar Chaman

    2015-01-01

    Full Text Available Teeth with calcification provide an endodontic treatment challenge; traumatized teeth usually develop partial or total pulpal obliteration which is characterized by apparent loss of the pulp space radiographically and a yellow discoloration of the clinical crown. Since only 7-27% of such teeth develop pulp necrosis with radiographic signs of apical periodontitis, it is difficult to decide whether to treat these teeth immediately upon detection of the pulpal obliteration or to wait until signs and symptoms of pulp and/or apical periodontitis occur. This article reviews the etiology, prevalence, classification, mechanism, diagnosis as well as treatment options for teeth with pulp obliteration and the various management approaches and treatment strategies for overcoming potential complications. A search of articles from "PubMed" and "Medline" from 1965 to present was done with the keywords dental trauma, discoloration, pathfinding instruments, pulp canal obliteration, and root canal treatment was conducted. A total of 94 abstracts were collected, of which 70 relevant articles were read and 31 most relevant articles were included in this article.

  17. Assessment of three root canal preparation techniques on root canal geometry using micro-computed tomography: In vitro study

    Directory of Open Access Journals (Sweden)

    Shaikha M Al-Ali

    2012-01-01

    Full Text Available Aim: To assess the effects of three root canal preparation techniques on canal volume and surface area using three-dimensionally reconstructed root canals in extracted human maxillary molars. Materials and Methods: Thirty extracted Human Maxillary Molars having three separate roots and similar root shape were randomly selected from a pool of extracted teeth for this study and stored in normal saline solution until used. A computed tomography scanner (Philips Brilliance CT 64-slice was used to analyze root canals in extracted maxillary molars. Specimens were scanned before and after canals were prepared using stainless steel K-Files, Ni-Ti rotary ProTaper and rotary SafeSiders instruments. Differences in dentin volume removed, the surface area, the proportion of unchanged area and canal transportation were calculated using specially developed software. Results: Instrumentation of canals increased volume and surface area. Statistical analysis found a statistically significant difference among the 3 groups in total change in volume (P = 0.001 and total change in surface area (P = 0.13. Significant differences were found when testing both groups with group III (SafeSiders. Significant differences in change of volume were noted when grouping was made with respect to canal type (in MB and DB (P < 0.05. Conclusion: The current study used computed tomography, an innovative and non destructive technique, to illustrate changes in canal geometry. Overall, there were few statistically significant differences between the three instrumentation techniques used. SafeSiders stainless steel 40/0.02 instruments exhibit a greater cutting efficiency on dentin than K-Files and ProTaper. CT is a new and valuable tool to study root canal geometry and changes after preparation in great details. Further studies with 3D-techniques are required to fully understand the biomechanical aspects of root canal preparation.

  18. The Effect of Canal Contamination with Saliva on Apical Sealing

    Directory of Open Access Journals (Sweden)

    S Sabaghi

    2014-08-01

    Full Text Available Introduction: Root canal obturation aims at sealing the root canal system to prevent re-contamination of canal and periapical space. Presence of moisture in canal before obturation may posit a negative effect on the quality of canal sealing. Therefore, this study was conducted to investigate the effect of canal contamination with saliva on apical microleakage. Methods: In this laboratory study, 58 human uni-root teeth were cleaned and shaped for obturation with gutta percha and sealer AH26. In the case group, specimens were contaminated with human saliva immediately before obturation, whereas the teeth in the control group were kept dry. All canals were filled by lateral condensation technique. Moreover, the teeth were placed in methylene blue dye for 3 days. Dye penetration was measured using a stereomicrosope. As a matter of fact, the study data were analyzed via utilizing t-test. Results: A significant difference was found between the two groups in regard with the apical leakage(P<0.001. The microleakage mean of dye in the dry group was 3/48mm, whereas it was 6/36mm in the saliva contaminated group. Conclusion: The study findings revealed that complete drying of canal can improve apical sealing.

  19. Evaluation of torque within manual preparation with root canal instruments

    OpenAIRE

    Gorski, Christof

    2016-01-01

    Used root canal instruments are often deformed; they can fracture, persist and reinfect teeth. There are no evident studies consulting torque and manual preparation of root canals. Thus, the purpose of this study is the evaluation of torque within manual preparation in connection with its impact on file deformation. With the aid of torque measurement a change in dental education could potentially be achieved.

  20. 33 CFR 117.769 - Black Rock Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Black Rock Canal. 117.769 Section 117.769 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements New York § 117.769 Black Rock Canal. The draws of...

  1. 33 CFR 117.159 - Grant Line Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Grant Line Canal. 117.159 Section 117.159 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements California § 117.159 Grant Line Canal. The draw of the San Joaquin County highway bridge, mile 5.5...

  2. 33 CFR 117.181 - Oakland Inner Harbor Tidal Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Oakland Inner Harbor Tidal Canal. 117.181 Section 117.181 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements California § 117.181 Oakland Inner Harbor Tidal Canal. The draws of the...

  3. 33 CFR 117.494 - Schooner Bayou Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Schooner Bayou Canal. 117.494 Section 117.494 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.494 Schooner Bayou Canal. The draw of the S82 bridge, mile 4.0 from White Lake...

  4. 33 CFR 117.849 - Muskingum River (Zanesville Canal).

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Muskingum River (Zanesville Canal). 117.849 Section 117.849 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Ohio § 117.849 Muskingum River (Zanesville Canal). The draw of the Conrail...

  5. 33 CFR 117.1051 - Lake Washington Ship Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Lake Washington Ship Canal. 117.1051 Section 117.1051 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Washington § 117.1051 Lake Washington Ship Canal. (a) When fog prevails by day or...

  6. 33 CFR 117.586 - Annisquam River and Blynman Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Annisquam River and Blynman Canal. 117.586 Section 117.586 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Massachusetts § 117.586 Annisquam River and Blynman Canal. The draw of the Blynman...

  7. 33 CFR 117.235 - Chesapeake and Delaware Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Chesapeake and Delaware Canal. 117.235 Section 117.235 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Delaware § 117.235 Chesapeake and Delaware Canal. The draw of the Conrail bridge, mile...

  8. 33 CFR 117.589 - Cape Cod Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Cape Cod Canal. 117.589 Section 117.589 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Massachusetts § 117.589 Cape Cod Canal. The draw of the Conrail railroad bridge, mile 0.7 at...

  9. 33 CFR 117.495 - Superior Oil Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Superior Oil Canal. 117.495 Section 117.495 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.495 Superior Oil Canal. The draw of the S82 bridge, mile 6.3, in Cameron...

  10. 5 CFR 550.714 - Panama Canal Commission employees.

    Science.gov (United States)

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Panama Canal Commission employees. 550.714 Section 550.714 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PAY ADMINISTRATION (GENERAL) Severance Pay § 550.714 Panama Canal Commission employees. (a) Notwithstanding any other provisions of this subpart,...

  11. 33 CFR 117.239 - Lewes and Rehoboth Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Lewes and Rehoboth Canal. 117.239 Section 117.239 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Delaware § 117.239 Lewes and Rehoboth Canal. (a) The draw of the Savannah Road/SR 18...

  12. 33 CFR 117.273 - Canaveral Barge Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Canaveral Barge Canal. 117.273 Section 117.273 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.273 Canaveral Barge Canal. (a) The drawspan of the Christa McAuliffe...

  13. Optimizing the chemical aspect of root canal irrigation

    NARCIS (Netherlands)

    R.G. de Macedo

    2013-01-01

    Root canal treatment is aimed at the removal of inflamed and infected tissue present in the root canal system. It will prevent the entrance of new microorganisms or nutrients in order to maintain or create a healthy environment around the root. There is sufficient evidence that shows that traditiona

  14. Reform in Indian canal irrigation: does technology matter?

    NARCIS (Netherlands)

    Narain, V.

    2008-01-01

    This paper examines the implications of technology - the design of canal irrigation for irrigation management reform. With reference to two different design systems in Indian irrigation - shejpali and warabandi - it shows that the potential for reform varies with the design of canal irrigation. Thre

  15. 33 CFR 117.653 - St. Mary's Falls Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false St. Mary's Falls Canal. 117.653 Section 117.653 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Michigan § 117.653 St. Mary's Falls Canal. The draw...

  16. Incidence of dentinal defects after root canal filling procedures

    NARCIS (Netherlands)

    Shemesh, H.; Wesselink, P.R.; Wu, M.K.

    2010-01-01

    Aim  To compare the incidence of dentinal defects (cracks and craze lines) after root canal preparation, lateral compaction and continuous wave compaction of gutta-percha and AH26 sealer. Methodology  Two hundred mandibular premolar teeth were divided into four groups with similar average canal diam

  17. Cultivo de tamarindo sob malhas coloridas: plasticidade anatômica foliar

    Directory of Open Access Journals (Sweden)

    Renata Alves Lara Silva

    2015-02-01

    Full Text Available Este trabalho teve como objetivo avaliar o efeito da alteração da qualidade espectral da luz, utilizando malhas de transmissão de luz diferenciada, sobre características da anatomia foliar em plantas de tamarindo (Tamarindus indica L., visando à obtenção de plantas mais propícias ao plantio. Mudas de tamarindo foram cultivadas sob malhas de 50% de sombreamento nas cores branca, azul, vermelha e preta em delineamento inteiramente casualizado. Após 90 dias de cultivo sob as malhas, as folhas foram avaliadas quanto à anatomia e micromorfologia. Plantas submetidas ao cultivo sob malha branca apresentaram maior altura das células da epiderme na face abaxial e maior espessura do parênquima paliçádico e da nervura central. Melhores resultados para epiderme na face adaxial e limbo foliar foram observados sob malhas branca e azul. Maiores densidades estomáticas foram obtidas sob malhas azul e vermelha. As folhas de Tamarindus indica apresentam plasticidade anatômica em resposta às modificações no espectro da radiação. Em face desses resultados, as malhas branca e azul podem ser recomendadas para obtenção de plantas mais propícias ao plantio.

  18. The Influence of Canalization on the Robustness of Boolean Networks

    CERN Document Server

    Kadelka, Claus; Laubenbacher, Reinhard

    2016-01-01

    Time- and state-discrete dynamical systems are frequently used to model molecular networks. This paper provides a collection of mathematical and computational tools for the study of robustness in Boolean network models. The focus is on networks governed by $k$-canalizing functions, a recently introduced class of Boolean functions that contains the well-studied class of nested canalizing functions. The activities and sensitivity of a function quantify the impact of input changes on the function output. This paper generalizes the latter concept to $c$-sensitivity and provides formulas for the activities and $c$-sensitivity of general $k$-canalizing functions as well as canalizing functions with more precisely defined structure. A popular measure for the robustness of a network, the Derrida value, can be expressed as a weighted sum of the $c$-sensitivities of the governing canalizing functions, and can also be calculated for a stochastic extension of Boolean networks. These findings provide a computationally eff...

  19. Direct solutions for normal depths in curved irrigation canals

    CERN Document Server

    Zhang, X Y

    2013-01-01

    The normal depth is an important hydraulic element for canal design, operation and management. Curved irrigation canals including parabola, U-shaped and catenary canals have excellent hydraulic performance and strong ability of anti-frost heave, while the normal depths in the governing equations of the current common methods have no explicit analytical solution. They are only indirect methods by using trial procedures, numerical methods, and graphical tools. This study presents new direct formulas for normal depth in curved irrigation canals by applying for Marquardt method. The maximum relative error of the proposed formulas is less than 1% within the practice range by comparative analysis, and they are simple and convenient for manual calculations. The results may provide the reliable theoretical basis and useful reference for the design and operation management of irrigation canals.

  20. VARIATION OF MAXILLARY FIRST PREMOLAR WITH THREE ROOT CANALS

    Directory of Open Access Journals (Sweden)

    Janet Kirilova

    2014-09-01

    Full Text Available Background: Successful endodontic treatment requires effective biomechanical preparation of the root canals and three-dimensional obturation of the root canal system. This can be achieved only by knowing and identifying the variations in the root canal system of the endodontically treated teeth. The Aim: The aim of this article is to present cases of endodontic treatment of maxillary first premolar with three root canals – different types. Material and Methods: Five clinical cases of successful endodontic treatment of patients with maxillary first premolar and three root canals are described. Result and Discussion: It is noted that good endodontic practice requires good knowledge of dental anatomy and possible variations, accurate X-ray images, as well as use of magnifying equipment. Conclusion: Knowledge of dental anatomy is fundamental for good endodontic practice.

  1. Canalization and symmetry in Boolean models for genetic regulatory networks

    Energy Technology Data Exchange (ETDEWEB)

    Reichhardt, C J Olson [Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Bassler, Kevin E [Department of Physics, University of Houston, Houston, TX 77204-5005 (United States)

    2007-04-20

    Canalization of genetic regulatory networks has been argued to be favoured by evolutionary processes due to the stability that it can confer to phenotype expression. We explore whether a significant amount of canalization and partial canalization can arise in purely random networks in the absence of evolutionary pressures. We use a mapping of the Boolean functions in the Kauffman N-K model for genetic regulatory networks onto a k-dimensional Ising hypercube (where k = K) to show that the functions can be divided into different classes strictly due to geometrical constraints. The classes can be counted and their properties determined using results from group theory and isomer chemistry. We demonstrate that partially canalizing functions completely dominate all possible Boolean functions, particularly for higher k. This indicates that partial canalization is extremely common, even in randomly chosen networks, and has implications for how much information can be obtained in experiments on native state genetic regulatory networks.

  2. A maxillary central incisor with four root canals

    Directory of Open Access Journals (Sweden)

    Fábio de Almeida-Gomes

    2012-01-01

    Full Text Available The objective of the present study is to present a case report of endodontic treatment of a maxillary central incisor with 1 root and 4 root canals. The success of endodontic treatment requires knowledge of dental anatomy and its variations. This clinical article reports an unusual anatomy detected in a maxillary central incisor with 4 root canals with an associated periapical lesion. The incidence of 4 root canals in this tooth is rare. However, it must be taken into consideration, the clinical and radiographic evaluations during the endodontic treatment in order to enhance the diagnostic. Many times, the presence of a supernumerary canal is noticed only after canal treatment due to continuing post-operative discomfort or treatment failure.

  3. Hydrology and environmental aspects of Erie Canal (1817-99)

    Science.gov (United States)

    Langbein, Walter Basil

    1976-01-01

    As the first major water project in the United States, the old Erie Canal provides an example of the hydrological and environmental consequences of water development. The available record shows that the project aroused environmental fears that the canal might be impaired by the adverse hydrologic effects of land development induced by the canal. Water requirements proved greater than anticipated, and problems of floods and hydraulic inefficiencies beset navigation throughout its history. The Erie Canal proved the practicality of major hydraulic works to the extent that operations and maintenance could cope with the burdens of deficiencies in design. The weight of prior experience that upland streams, such as the Potomac and Mohawk Rivers, had proved unsatisfactory for dependable navigation, led to a decision to build an independent canal which freed the location from the constraints of river channels and made possible a cross-country water route directly to Lake Erie. The decision on dimensioning the canal prism--chiefly width and depth-involved balance between a fear of building too small and thus not achieving the economic potentials, and a fear of building too expensively. The constraints proved effective, and for the first part of its history the revenues collected were sufficient to repay all costs. So great was the economic advantage of the canal that the rising trend in traffic soon induced an enlargement of the canal cross section, based upon a new but riskier objective-build as large as the projected trend in toll revenues would finance. The increased revenues did not materialize. Water supplies were a primary concern for both the planners and the operators of the canal. Water required for lockage, although the most obvious to the planners, proved to be a relatively minor item compared with the amounts of water that were required to compensate for leakage through the bed and banks of the canal. Leakage amounted to about 8 inches of depth per day. The total

  4. 5 CFR 315.601 - Appointment of former employees of the Canal Zone Merit System or Panama Canal Employment System.

    Science.gov (United States)

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Appointment of former employees of the Canal Zone Merit System or Panama Canal Employment System. 315.601 Section 315.601 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS CAREER AND CAREER-CONDITIONAL EMPLOYMENT Career or Career-Conditional Appointment...

  5. Interfases adhesivas al utilizar cementos de resina en el interior de los conductos radiculares: Comparación al MEB Adhesive interfaces when using resin cement at the interior of the radicular duct: A SEM comparison

    Directory of Open Access Journals (Sweden)

    V. Valenzuela Aránguiz

    2013-02-01

    Full Text Available Se realizó una comparación micro morfológica de la interfase dentina radicular - resina de cementación de postes de fibra de vidrio con dos sistemas de resinas compuestas, Relyx UnicemTM y ParaCemTM. Veinte premolares unirradiculares, extraídos por indicación ortodóncica fueron divididos al azar en dos grupos de 10 y se les realizó terapia endodóntica convencional. Las muestras fueron desobturadas parcialmente y se cementaron los postes de fibra (Tenax Fiber White, Coltene-Whaledent con los materiales en estudio siguiendo las indicaciones del fabricante. Posteriormente se realizaron cortes en los tercios apical, medio y cervical y se prepararon para la observación al microscopio electrónico de barrido (MEB. Las raíces cuyos postes fueron cementados con Relyx UnicemTM no evidenciaron formación de capa hibrida en ninguno de los tercios. La interfase cemento-dentina se encontró irregular y discontinua, en cambio se encontró una intima unión poste-cemento. Las raíces en las que se utilizó el ParaCem formaron una capa híbrida uniforme y homogénea de un espesor promedio de 2 μm sólo en el tercio cervical, no encontrándose esta estructura en los tercios medio y apical. También se evidenció una intima unión poste-cemento. Conclusiones: El cemento Relyx UnicemTM, no ha formado capa híbrida a lo largo del conducto. En cambio con el ParaCemTM es posible encontrarla aunque solo a nivel cervical. No se observó formación de tags con los cementos probados en este estudio. Ambos cementos han generado unión íntima entre el poste de fibra y la resina cementante.A micro morphological study was performed; this study compared the interface between radicular dentin and resin cement, when fixing fiberglass posts with Relyx UnicemTM and ParaCemTM systems. Twenty single-rooted premolars, extracted by orthodontic indication, were divided randomly into two groups of 10 teeth each. Endodontic treatment using gutta-percha points and Grossman

  6. Propriedades físicas do solo e crescimento de raízes de milho em um argissolo vermelho sob tráfego controlado de máquinas

    Directory of Open Access Journals (Sweden)

    Michael Mazurana

    2013-10-01

    Full Text Available O desempenho das funções do solo pode ser influenciado pela compactação imposta pelo manejo inadequado. Algumas propriedades físicas do solo são tomados como indicadores da presença de camadas compactadas, as quais podem interferir no desenvolvimento radicular de culturas. Práticas agrícolas, como o uso de plantas de cobertura, que melhoram as propriedades do solo, podem mitigar problemas relacionados à compactação. O objetivo deste trabalho foi avaliar propriedades físicas de solo e de plantas, estas cultivadas em condições controladas. Em um Argissolo Vermelho sob sistema plantio direto consolidado com dois manejos de cobertura de inverno (pousio e aveia + ervilhaca e tráfego controlado de máquinas [sem tráfego (ST, antes do tráfego (AT e depois do tráfego (DT], avaliaram-se a pressão de pré-consolidação, a resistência do solo à penetração, a densidade do solo, a porosidade e o diâmetro médio ponderado de agregados. Amostras indeformadas de solo das condições antes e depois do tráfego foram coletadas em vasos de PVC e acondicionadas em casa de vegetação, nos quais foram semeadas três sementes de milho, e cultivadas durante 25 dias sob diferentes condições de disponibilidade hídrica. Após esse período, determinaram-se a área foliar, massa verde e seca da parte aérea e massa úmida e seca das raízes de plantas de milho. A densidade do solo independentemente da camada avaliada não foi influenciada pela condição de cobertura do solo, mas sim pela condição de tráfego. Já a macroporosidade foi influenciada pelo tráfego no sistema pousio até 0,10 m, indicando ter esse sistema menor capacidade de suportar perturbações, comprovado pelos menores valores de pressão de pré-consolidação. A resistência do solo à penetração aumentou em profundidade, estando relacionada à maior densidade, menor macroporosidade e maior pressão de pré-consolidação. Sem restrição hídrica, o crescimento

  7. Reduction of Enterococcus faecalis in curved root canals after various sizes and tapers of canal preparation

    Directory of Open Access Journals (Sweden)

    Amir Abbas Moshari

    2015-01-01

    Full Text Available Aims: The aim of this study was to evaluate the reduction of Enterococcus faecalis in curved root canals after various sizes and tapers of the canal preparation. Materials and Methods: Mandibular first molars (n = 103 with curved mesiobuccal canals were divided into one control (n = 5 and 7 experimental (n = 14 groups, were inoculated with E. faecalis (ATTC 29212 and prepared with the following RaCe files (FKG Dentaire as master apical file: Groups: 25.04, 25.06, 30.04, 30.06, 35.04, 35.06 and 40.06. All the experimental groups were irrigated with 2 mL of 1% sodium hypochlorite during instrumentation and finally rinsed with 17% ethylenediaminetetraacetic acid (EDTA (2 mL followed by 5.25% NaOCl (2 mL and sterile distilled water. Colony counting was performed after incubation. Statistical Analysis Used: Resulting data were analyzed using one-way ANOVA and Tukey′s post-hoc test, (P < 0.05. Results and Conclusions: All the experimental groups showed significant bacterial reduction (P < 0.001. Although the greater the size/taper or both led to more decreased amount of bacteria, differences between the groups with the identical size and different tapers, and among the groups with the same taper and different sizes were not significant. Based on this study, 25.04 along with using 2 mL of 1% NaOCl during instrumentation, and using 17% EDTA and 5.25% NaOCl as final rinse successively after the termination of preparation, can effectively reduce intra-canal bacteria and preserve root structure.

  8. Atributos físicos do solo relacionados ao armazenamento de água em um Argissolo Vermelho sob diferentes sistemas de preparo

    Directory of Open Access Journals (Sweden)

    Silva Mellissa Ananias Soler da

    2005-01-01

    Full Text Available Os sistemas de preparo afetam a estrutura do solo e podem influenciar o armazenamento de água disponível para as plantas. O objetivo deste estudo foi avaliar o efeito de longo prazo (17 anos dos sistemas de preparo convencional (PC, preparo reduzido (PR e semeadura direta (SD sobre os atributos físicos relacionados ao armazenamento e disponibilidade de água de um Argissolo Vermelho com textura média, em Eldorado do Sul, RS. Amostras de solo (0-2,5, 2,5-7,5, 7,5-12,5, 12,5-17,5cm foram coletadas numa seqüência ervilhaca/milho. Adicionalmente, amostrou-se uma área sob campo nativo (CN, adjacente à área experimental, como referência à condição natural do solo. O solo em SD apresentou maiores teores de carbono orgânico (CO na camada superficial e maiores valores de resistência ao penetrômetro em profundidade, em relação ao solo em preparo convencional. Os sistemas de preparo não se diferenciaram quanto ao seu efeito na macro e microporosidade do solo, contudo o revolvimento no PC aumentou a condutividade hidráulica saturada em profundidade. Não se verificou nenhuma restrição física ao desenvolvimento radicular sob os diferentes sistemas de preparo, o que foi comprovado pelos valores de densidade (1,35 a 1,65 Mg m-3, macroporosidade (0,09 a 0,20 m³ m-3 e resistência ao penetrômetro (0,25 a 0,75 MPa. Do ponto de vista hídrico, as curvas de retenção e o volume de água disponível (AD = 10 kPa (capacidade de campo - 1.500 kPa (ponto de murcha permanente, não foram influenciados pelos sistemas de preparo, sendo o baixo volume de água disponível (0,05 a 0,09 m³ m-3 relacionado à textura desse solo. Nesse caso, o aumento da taxa de infiltração e a diminuição da evaporação da água decorrente da manutenção dos resíduos vegetais sobre o solo nos sistemas de preparo reduzido e semeadura direta, podem contribuir para uma maior disponibilidade hídrica na fase inicial do estabelecimento das culturas nesses sistemas

  9. Preparación de canales curvos y calcificados

    OpenAIRE

    Karen Sofia Gallego Lopez; Ricardo Cabrales Salgado; Antonio Díaz Caballero

    2013-01-01

    ResumenLa preparación durante el tratamiento endodóntico consiste en la correcta limpieza y conformación del sistema de conductos radiculares, y que conserve siempre su forma original. Al finalizar la preparación, se debe obtener un conducto con conicidad uniforme y con un tope apical, que permita un selle hermético al momento de la obturación. Se debe tener en cuenta la dificultad para lograr resultados satisfactorios sobre todo en conductos curvos y calcificados debido a la complejidad de é...

  10. Facial Canal Dehiscence in Patients with Chronic Otitis Surgery

    Directory of Open Access Journals (Sweden)

    Ahmet Uluat

    2016-04-01

    Full Text Available Aim: To examine facial canal status in patients with chronic otitis media (COM surgery and to detect the relation between facial canals dehiscence (FCD with middle ear pathology in these patients. Material and Method: The surgery data of patients who were subjected to tympanoplasty with or without mastoidectomy and radical mastoidectomy due to COM were analyzed retrospectively from January 2006 to December 2012. In addition to demonstrative data of the patients, status of facial canal and preoperative diagnoses of patients, type of the operation performed, status of middle ear, number of surgeries, existence of cholesteatoma, existence of ossicular chain defect, lateral canal defect and dura defect were assessed and the relation thereof with facial canal dehiscence (FCD was analyzed statistically. Results: Seven hundred ninety six patients were included in the study. FCD was detected in 10.05% of the patients. FCD was most frequently observed in the tympanic segment. It was found out that there was a statistically significant relationship of middle ear pathology, cholesteatoma, revision surgery, lateral semicircular canal and ossicular chain defect with FCD. Discussion: COM diagnosed patients may have defect in facial canal according to their preoperative diagnoses, middle ear pathologies, number of operations and ossicular chain defects. These patients should be applied a more careful surgery and closely followed up in postoperative periods.

  11. Assessing the accuracy of tympanometric evaluation of external auditory canal volume: a scientific study using an ear canal model.

    Science.gov (United States)

    Al-Hussaini, A; Owens, D; Tomkinson, A

    2011-12-01

    Tympanometric evaluation is routinely used as part of the complete otological examination. During tympanometric examination, evaluation of middle ear pressure and ear canal volume is undertaken. Little is reported in relation to the accuracy and precision tympanometry evaluates external ear canal volume. This study examines the capability of the tympanometer to accurately evaluate external auditory canal volume in both simple and partially obstructed ear canal models and assesses its capability to be used in studies examining the effectiveness of cerumolytics. An ear canal model was designed using simple laboratory equipment, including a 5 ml calibrated clinical syringe (Becton Dickinson, Spain). The ear canal model was attached to the sensing probe of a Kamplex tympanometer (Interacoustics, Denmark). Three basic trials were undertaken: evaluation of the tympanometer in simple canal volume measurement, evaluation of the tympanometer in assessing canal volume with partial canal occlusion at different positions within the model, and evaluation of the tympanometer in assessing canal volume with varying degrees of canal occlusion. 1,290 individual test scenarios were completed over the three arms of the study. At volumes of 1.4 cm(3) or below, a perfect relationship was noted between the actual and tympanometric volumes in the simple model (Spearman's ρ = 1) with weakening degrees of agreement with increasing volume of the canal. Bland-Altman plotting confirmed the accuracy of this agreement. In the wax substitute models, tympanometry was observed to have a close relationship (Spearman's ρ > 0.99) with the actual volume present with worsening error above a volume of 1.4 cm(3). Bland-Altman plotting and precision calculations provided evidence of accuracy. Size and position of the wax substitute had no statistical effect on results [Wilcoxon rank-sum test (WRST) p > 0.99], nor did degree of partial obstruction (WRST p > 0.99). The Kamplex tympanometer

  12. Bacterial coronal leakage after obturation with three root canal sealers.

    Science.gov (United States)

    Timpawat, S; Amornchat, C; Trisuwan, W R

    2001-01-01

    The purpose of this study was to compare the bacterial leakage of root canals obturated with three root canal sealers, using Endodontalis faecalis as a microbial tracer to determine the length of time for bacteria to penetrate through the obturated root canal to the root apex. Seventy-five, single-rooted teeth with straight root canals had the crown cut off at the cementoenamel junction. Root canals were instrumented by a step-back technique. The prepared teeth were randomly divided into 3 groups of 19 teeth each and another 2 groups as positive and negative controls (9 teeth each). The experimental groups were dependent on the sealer used: AH-Plus, Apexit, and Ketac-Endo. The root canals were obturated using a lateral condensation technique. After 24 h the teeth were attached to microcentrifuge tubes with 2 mm of the root apex submerged in Brain Heart Infusion broth in glass test tubes. The coronal portions of the root canal filling materials were placed in contact with E. faecalis. The teeth were observed for bacterial leakage daily for 30 and 60 days. With the chi2 test for comparing pairs of groups at the 0.05 level (p 0.06), but Apexit had significantly higher leakage (p 0.05), but Apexit leaked more than AH-Plus. The conclusion drawn from this experiment was that epoxy resin root canal sealer was found to be more adaptable to the root canal wall and filling material than a calcium hydroxide sealer when bacterial coronal leakage was studied.

  13. Quinta parte. Pudriciones Fungosas Radiculares del Fríjol en Valle de Medellín Colombia

    Directory of Open Access Journals (Sweden)

    Cárdona Álvarez Canúto

    1954-11-01

    Full Text Available En esta parte se hace el resumen del estudio que se realizo sobre las pudriciones fungosas radiculares del fríjol en el valle de Medellín, a continuación se enumeran las conclusiones a las que se llegaron: 1A partir de 1948 se hizo un estudio de determinación de los hongos que causan pudriciones de la raíz del fríjol. Dicho estudio se efectuó en Medellín e incluyó organismos de la región y de otros lugares, como Andes, Armero y Palmira. Se usaron organismos que se encontraron asociados con pudriciones de la raíz del fríjol, vigna, remolacha y soya. 2Lo organismos aislados se obtuvieron directamente de las raíces afectadas y no de otra fuente como el suelo o la semilla. 3Concomitante con la obtención de los cultivos de los organismos, se hizo un estudio abarcando apreciación de distribución de los hongos en los plantíos y pérdidas en rendimiento, causadas por los agentes, expresadas en peso de semilla. Se obtuvieron porcentajes naturales de infección variando entre 68.55 y 100% y reducción en el rendimiento hasta del 93%. 4Se hizo una descripción de síntomas y de signos para cada especie patógena encontrada durante este trabajo. Asimismo se estudió la clasificación taxonómica de cada organismo en particular.

  14. Horizontal canal benign paroxysmal positional vertigo in a fighter pilot

    OpenAIRE

    Su-Jiang Xie; Jiang-Chang Wang; Li Ding; Xi-Qing Sun

    2011-01-01

    Benign paroxysmal positional vertigo (BPPV) is the most common disorder of the peripheral vestibular system, characterized by intense, positional provoked vertigo. BPPV is thought to occur due to canalithiasis of the posterior semicircular canal. Recently, a new entity of BPPV, known as horizontal canal (HC)-BPPV, has been recognized. Although only 3 to 8% of BPPV is due to horizontal canal involvement, HC-BPPV is not rare. We present a case of a naval fighter pilot who had an incident of HC-...

  15. Horizontal canal benign paroxysmal positional vertigo in a fighter pilot

    Directory of Open Access Journals (Sweden)

    Su-Jiang Xie

    2011-01-01

    Full Text Available Benign paroxysmal positional vertigo (BPPV is the most common disorder of the peripheral vestibular system, characterized by intense, positional provoked vertigo. BPPV is thought to occur due to canalithiasis of the posterior semicircular canal. Recently, a new entity of BPPV, known as horizontal canal (HC-BPPV, has been recognized. Although only 3 to 8% of BPPV is due to horizontal canal involvement, HC-BPPV is not rare. We present a case of a naval fighter pilot who had an incident of HC-BPPV on the ground. The pilot aeromedical evaluation and considerations are discussed.

  16. Horizontal canal benign paroxysmal positional vertigo in a fighter pilot.

    Science.gov (United States)

    Xie, Su-Jiang; Wang, Jiang-Chang; Ding, Li; Sun, Xi-Qing

    2011-01-01

    Benign paroxysmal positional vertigo (BPPV) is the most common disorder of the peripheral vestibular system, characterized by intense, positional provoked vertigo. BPPV is thought to occur due to canalithiasis of the posterior semicircular canal. Recently, a new entity of BPPV, known as horizontal canal (HC)-BPPV, has been recognized. Although only 3 to 8% of BPPV is due to horizontal canal involvement, HC-BPPV is not rare. We present a case of a naval fighter pilot who had an incident of HC-BPPV on the ground. The pilot aeromedical evaluation and considerations are discussed.

  17. Faraday ghosts depolarization canals in the Galactic radio emission

    CERN Document Server

    Shukurov, A M; Shukurov, Anvar; Berkhuijsen, Elly M.

    2003-01-01

    Narrow, elongated regions of very low polarized intensity -- so-called canals -- have recently been observed by several authors at decimeter wavelengths in various directions in the Milky Way, but their origin remains enigmatic. We show that the canals arise from depolarization by differential Faraday rotation in the interstellar medium and that they represent level lines of Faraday rotation measure RM, a random function of position in the sky. Statistical properties of the separation of canals depend on the autocorrelation function of RM, and so provide a useful tool for studies of interstellar turbulence.

  18. Route Selection by Tankers(Dirty) at the Suez Canal

    Institute of Scientific and Technical Information of China (English)

    Risto Laulajainen

    2007-01-01

    <正>The Suez Canal,attached route alternatives with traffic flows and areas are described and theoretical break-even points derived. Logistically,route selection depends on relative distances,the level of spot rates and canal dues,the sensitivity to change growing with rising rate levels.The connection is diluted by the canal /pipeline owners’ price differentiation and the charterers’ capital costs;interest on cargo and change of its value during transit.Ship-owners are largely neutral to route choice as long as rates and main cost items are directly related to distance.

  19. Constricted Canals: A New Strategy to Overcome This Challenge

    Directory of Open Access Journals (Sweden)

    Ricardo Machado

    2014-01-01

    Full Text Available Negotiation of constricted canals can be a challenge during endodontic treatment. Over the years, several strategies have been presented in order to overcome the difficulties imposed by this anatomical feature. This paper presents three cases using a different protocol from that recommended by the manufacturer of the Protaper System in order to facilitate the negotiation of constricted canals. These cases suggest that the modified protocol shown is able to perform the shaping process with less resistance, reducing the risk of instrument separation and performing an effective process to reach the apical thirds in constricted canals.

  20. Cytogenetic findings in persons living near the Love Canal.

    Science.gov (United States)

    Heath, C W; Nadel, M R; Zack, M M; Chen, A T; Bender, M A; Preston, R J

    1984-03-16

    Cytogenetic analyses were performed on peripheral blood from 46 present or past residents of the area surrounding Love Canal, a former dump site for chemical wastes in Niagara Falls, NY. Participants included 17 persons in whom cytogenetic analyses had been performed in 1980 and 29 persons who had been living in 1978 in seven homes that directly adjoined the canal and in which environmental tests showed elevated levels of chemicals spreading from the canal. Frequencies of chromosomal aberrations and of sister chromatid exchange (SCE) did not differ significantly from control levels. For all participants, cigarette smoking was associated with an increase in sister chromatid exchange frequency.

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  5. Biological control of Phytophthora root rot of avocato with microorganisms grown in organic mulches Controle biológico da podridão radicular de Phytophthora no abacateiro utilizando substratos orgânicos colonizados

    Directory of Open Access Journals (Sweden)

    Jefferson L. da S. Costa

    2000-10-01

    Full Text Available Organic mulches colonized with microbial biocontrol agents, termed bioenhanced mulches, were tested for their ability to reduce Phytophthora root rot of avocado (Persea americana Mill.. Benomyl-resistant mutants of Gliocladium virens (KA 230-1 and Trichoderma harzianum (KA 159.2 isolated from suppressive soils and selected as efficient antagonists of P. cinnamomi were evaluated for their ability to colonize different mulches under controlled laboratory conditions. Sudangrass and a coarse yardwaste were found to be better substrates than a fine yardwaste, woodwaste or rice hulls for biocontrol agents propagules production. The most suitable conditions for colonization were an optimum temperature of 24°C, a moisture content of 20% for sudangrass and 30% for the coarse yardwaste, and a continuous light exposure during a 15-day incubation period. In the greenhouse, fresh sudangrass and a coarse yardwaste colonized with G. virens and used as a surface mulch proved to be the best combination for reducing the population of P. cinnamomi in 4-liter pots containing artificially-infested soil. Healthy avocado roots made up 31-37% of the roots in the G. virens-mulch combinations compared to 0% healthy in infested controls after two months.Compostos orgânicos colonizados com agentes de controle microbiológico, então denominados compostos bioativados, foram testados quanto a sua habilidadade controlar à podridão radicular de Phytophtora no abacateiro (Persea americana Mill. Mutantes de Gliocladium virens (KA 230-1 e Trichoderma harzianun (KA 159-2 resistentes a benomyl recuperados de solos supressivos e selecionados como eficientes antagonistas à P. cinnamoni foram avaliados quanto à sua capacidade de colonizar diversos compostos orgânicos em condições de laboratório. O Capim Sudão e um Composto de Jardim de alta granulação demonstraram quanto à sua capacidade de multiplicar propágulos de agentes de biocontrole, serem superiores à um

  6. Localización efectiva de un segundo conducto radicular en incisivos inferiores mediante magnificación, radiografía y diafanización

    OpenAIRE

    Duque, Thais Mageste; Departamento de Odontología Restauradora, Área de Endodoncia. Facultad de Odontología de Piracicaba, Universidad Estadual de Campinas (FOP-UNICAMP). Sau Paulo.; Herrera Morante, Daniel Rodrigo; Departamento de Odontología Restauradora, Área de Endodoncia. Facultad de Odontología de Piracicaba, Universidad Estadual de Campinas (FOP-UNICAMP). Sau Paulo.; Randi Ferraz, Caio Cézar; Departamento de Odontología Restauradora, Área de Endodoncia. Facultad de Odontología de Piracicaba, Universidad Estadual de Campinas (FOP-UNICAMP). Sau Paulo.; Zaia, Alexandre Augusto; Departamento de Odontología Restauradora, Área de Endodoncia. Facultad de Odontología de Piracicaba, Universidad Estadual de Campinas (FOP-UNICAMP). Sau Paulo.; Affonso de Almeida, José Flávio; Departamento de Odontología Restauradora, Área de Endodoncia. Facultad de Odontología de Piracicaba, Universidad Estadual de Campinas (FOP-UNICAMP). Sau Paulo.; Figueiredo de Almeida Gomes, Brenda Paula; Departamento de Odontología Restauradora, Área de Endodoncia. Facultad de Odontología de Piracicaba, Universidad Estadual de Campinas (FOP-UNICAMP). Sau Paulo.

    2014-01-01

    Objetivo: Evaluar in vitro, la efectividad del método visual y radiográfico, comparándolos con la técnica de diafanización en la detección del segundo conducto radicular de incisivos inferiores tratados endodónticamente. Material y métodos: Fueron analizados 133 dientes incisivos inferiores permanentes, tratados endodónticamente, a través de métodos visuales (con y sin auxilio de magnificación), radiográficos y de diafanización. El análisis radiográfico fue realizado en negatoscopio utilizand...

  7. El surco de desarrollo radicular como causa de fracaso endodóncico: a propósito de un caso

    OpenAIRE

    L. Miguel; Arnabat Domínguez, Josep; Pumarola Suñé, José; Berini Aytés, Leonardo; Gay Escoda, Cosme

    2005-01-01

    El surco de desarrollo radicular es una anomalía dentaria de origen embriológico presente en el 8,5% de la población que se localiza principalmente en la cara palatina de los incisivos laterales superiores. Este surco se origina en la fosa central y atravesando el cíngulo se dirige hacia el ápice, siendo su longitud variable. A través de él, los microorganismos penetran en el ligamento periodontal, causando una destrucción ósea localizada. Clínicamente los dientes afectados por esta anomalía ...

  8. Reabsorción radicular externa apical en incisivos y caninos superiores e inferiores sometidos a tratamiento de Ortodoncia en etapa inicial

    OpenAIRE

    2016-01-01

    La Reabsorción radicular externa apical es un proceso inflamatorio común asociado con el tratamiento de ortodoncia. El objetivo de este estudio fue comparar la magnitud de la RREA de los incisivos y caninos superiores e inferiores en pacientes sometidos a la fase inicial del tratamiento de ortodoncia con tres diferentes tipos de brackets. La muestra consistió en 23 casos de pacientes con edades comprendidas entre 12 y 27 años, fueron divididos aleatoriamente en 3 grupos. Grupo I (n=9; 5 mujer...

  9. Tratamiento ortodóntico quirúrgico de canino maxilar impactado con reabsorción radicular bilateral: Reporte de caso

    OpenAIRE

    Mercado-Mamani, Sively; Universidad Católica Santa María. Arequipa.; Ríos-Villasis, Katty; Universidad Inca Garcilazo de la Vega. Lima.

    2014-01-01

    Los dientes caninos superiores permanentes impactados bilaterales son un problema clínico que puede provocar una serie de secuelas irreversibles como la reabsorción radicular de dientes vecinos. Se describe el caso de una paciente con ausencia clínica de caninos superiores que se encontraban impactados orientados hacia vestibular  produciendo reabsorción de los dos tercios de la raíces de todos los incisivosSuperiores,los que fueron extraídos, en el mismo acto se realizó la exposición quirúrg...

  10. Análisis morfométrico de los conductos radiculares del segundo molar superior permanente : evaluación comparativa entre grupos etarios.

    OpenAIRE

    Urrutia García, Daniel Alejandro

    2014-01-01

    Conocer el terreno donde se va a actuar es un requisito esencial para que el endodoncista pueda actuar con eficiencia. El segundo molar superior permanente (2MSP) es, quizás, una de las piezas más complejas y, a su vez, menos descripta en la literatura clásica respecto a su morfología externa y la configuración interna de sus conductos radiculares; sumando a esta carencia de información específica, los cambios que la edad producen en los mismos. El presente trabajo pretende analizar compara...

  11. Avaliação radiográfica do preparo apical de canais radiculares instrumentados com limas manuais e sistenas rotatórios

    OpenAIRE

    José Vasconcelos de Queiroz, Artur

    2003-01-01

    Desde a introdução das primeiras limas confeccionadas em liga de níquel-titânio na endodontia, diversos instrumentos manuais e rotatórios foram integrados ao arsenal endodôntico com a promessa de se realizar uma instrumentação rápida e segura do sistema de canais radiculares. No presente trabalho foram utilizados 50 molares inferiores humanos, com processo de rizogênese completa, obtidos no banco de dentes do Curso de Pós-Graduação em Odontologia do Centro de Ciências da Saú...

  12. Materiais obturadores de canais radiculares de dentes decíduos: avaliação da atividade antibacteriana in vitro e da compatibilidade tecidual in vivo

    OpenAIRE

    2008-01-01

    Avaliou-se a atividade antibacteriana e a compatibilidade tecidual dos seguintes materiais obturadores de canais radiculares de dentes decíduos: cimento de óxido de zinco e eugenol, pasta Calen® espessada com óxido de zinco, cimento Sealapex® e cimento EndoREZTM. A atividade antibacteriana foi avaliada in vitro, por meio do teste de difusão em ágar, frente a 5 microrganismos indicadores (Kocuria rizophila, Enterococcus faecalis, Streptococcus mutans, Escherichia coli e Staphylococcus aureus)...

  13. Caracterização anatômica e química da folha e do sistema radicular de Hydrocotyle umbellata (Apiaceae Anatomical and chemical characterization of the leaf and root system of Hydrocotyle umbellata (Apiaceae

    Directory of Open Access Journals (Sweden)

    Maria Bernadete Gonçalves Martins

    2008-09-01

    Full Text Available A família Apiaceae (Umbelliferae, também denominada de pioneira das praias, é capaz de habitar locais de alto teor de salinidade, além de suportar a ação dos ventos e das ondas. O presente trabalho teve como objetivo o estudo da anatomia foliar e radicular e analisar constituintes químicos das folhas e do sistema radicular, caracterizando grupos químicos biologicamente ativos presentes nesses órgãos que permitam aplicações farmacológicas. O material foi coletado na região de Proteção Ambiental Iguape, Cananéia, Peruíbe. As folhas são dorsiventrais, com epiderme unisseriada, bordo regular, parênquima paliçádico com duas a três camadas e parênquima lacunoso com oito e nove camadas de células. É anfiestomática, apresentando grandes câmaras subestomáticas com maior incidência de estômatos na epiderme abaxial. O feixe vascular é colateral apresentando células de esclerênquima em forma de meia lua ao redor do xilema e do floema. O pecíolo apresenta contorno irregular, está envolvido por colênquima em toda sua extensão e apresenta grande quantidade de canais secretores entre os feixes vasculares. O rizoma apresenta contorno irregular com variação de 10 a 15 camadas de células de parênquima constituindo o córtex. O cilindro central é constituído por feixes colaterais delimitados pela endoderme. O periciclo é sinuoso e envolve totalmente os feixes vasculares. Sob a epiderme há uma faixa contínua de colênquima. A medula é constituída de células de parênquima de parede fina. H. umbellata apresentou triterpenos, saponinas, flavonóides, compostos poliacetilênicos e leucoceramidas. Folhas e rizomas apresentaram constituintes químicos semelhantes, com diferenças apenas na intensidade dos picos, o que denota diferença quantitativa entre as substâncias presentes. O rendimento do extrato do rizoma é menor que o rendimento das folhas.The Apiaceae family (Umbelliferae, also called pioneer of beaches, is

  14. Delayed tooth replantation after root surface treatment with sodium hypochlorite and sodium fluoride: histomorphometric analysis in rats Reimplante dentário tardio após o tratamento da superfície radicular com hipoclorito de sódio e fluoreto de sódio: análise histomorfométrica em ratos

    Directory of Open Access Journals (Sweden)

    André Dotto Sottovia

    2006-04-01

    Full Text Available In cases of delayed tooth replantation, non-vital periodontal ligament remnants have been removed with sodium hypochlorite in an attempt to control root resorption. Nevertheless, reports of its irritating potential in contact with the alveolar connective tissue have been described. Therefore, this study evaluated the healing process on delayed replantation of rat teeth, after periodontal ligament removal by different treatment modalities. Twenty-four rats, assigned to 3 groups (n=8, had their upper right incisor extracted and left on the workbench for desiccation during 60 min. Afterwards, the teeth in group I were immersed in saline for 2 min. In group II, root surfaces were scrubbed with gauze soaked in saline for 2 min; and in group III, scrubbing was done with gauze soaked in 1% sodium hypochlorite solution. Thereafter, root surfaces were etched with 37% phosphoric acid and immersed in 2% acidulate-phosphate sodium fluoride solution, at pH 5.5. Root canals were filled with a calcium hydroxide-based paste and the teeth were replanted. The animals were sacrificed 60 days postoperatively and the pieces containing the replanted teeth were processed and paraffin- embedded. Semi-serial transversally sections were obtained from the middle third of the root and stained with hematoxylin and eosin for histomorphometric analysis. Data were analyzed statistically using Kruskal-Wallis and Dunn's tests. The results showed that root structure and cementum extension were more affected by resorption in group III (pEm reimplante dentário tardio, o ligamento periodontal desvitalizado tem sido removido empregando-se o hipoclorito de sódio, buscando o controle da reabsorção radicular. Relatos de efeito irritante no tecido conjuntivo alveolar após o seu uso, têm sido descritos. Isso justificou a realização deste trabalho buscando minimizar esse inconveniente. Para isso 24 ratos, divididos em 3 grupos de 8 animais, tiveram o incisivo superior direito extra

  15. Effects of radicular dentin treatments and luting materials on the bond of quartz fiber posts: scanning electron microscope study%根管壁不同处理方法对纤维桩粘接影响的扫描电镜观察

    Institute of Scientific and Technical Information of China (English)

    毛海燕; 严斌; 冯丽君; 陈亚明

    2010-01-01

    Objective To investigate the effects of radicular dentin treatments of sodium hypochlorite (NaOCl) and ethylenediaminetctraacetic acid (EDTA) on the regional root canal bending interface of quartz fiber posts using 2 luting materials with SEM analysis. Methods Nine intact maxillary central incisors were sectioned and endodontically treated. Standardized post space preparations and acid etch were performed . All specimens were randomly divided into 3 groups(n =3). D.T. LIGHT posts were placed into the root canal using one of three radicular dentin treatments(0. 9% NaCl for 60 s, 10% NaOCl for60 s, 17% EDTA for 60 s followed by 5.25% NaOCl for 60 s) in combination of one of two luting materials (DuoLink, LuxaCore) respectively (factorial design). Cervical, middle, apical sections of each teeth are used for SEM study and spectroscopy of dispersion energy (EDS) microanalysis. Results With the radicular dentin treatment with 10% NaOCl alone or with 17% EDTA followed by 5.25% NaOCl, longer and increased number of penetration of resin tags into the dentinal tubules were observed at the resin-dentin interfaces, and adhesive lateral branches could be found easily. EDS microanalysis showed increase in the infiltration behavior of the luting cement. Conclusions Radicular dentin treatments provide good resin infiltration, which can produce a three-dimensional interlocking micronetwork of resin tags in the dentin tubules with multiple lateral branches that penetrate the intertubalar dentin, thus positively influence the adhesion between dentin and the luting materials.%目的 通过观察根管不同部位粘接界面的微观结构,探讨根管壁表面不同处理方法对纤维桩粘接的影响.方法 9颗完整离体上中切牙截冠后经根管治疗、根管预备和酸蚀后,分别采用0.9%NaCl溶液60 s(对照组,3颗)、10%NaOCl溶液60 s(实验1组,3颗)、17%乙二胺四乙酸溶液60 s与5.25%NaOCI溶液60 S联用(实验2组,3颗)冲洗根管壁;每组1

  16. Atypical situations in root canals anatomy of human mandibular premolars

    Directory of Open Access Journals (Sweden)

    Fabrício SCAINI

    2005-05-01

    Full Text Available The knowledge of the teeth internal anatomy that will receive endodontic treatment is very important for the success of the treatment and prognosis of those teeth. In this study, the morphological variations that may occur in relation to the number of root canals present in the premolar mandibular teeth group were discussed, as well as the most efficient methods to diagnose the existence of these variations, in order to have a clearer diagnosis of the number of root canals to be treated.A case of an endodontic treatment of a mandibular premolar with 4 root canals was reported and some cases of endodontic treatment in mandibular premolars with 1, 2 and 3 root canals were shown.

  17. Functional outcome of surgical management of degenerative lumbar canal stenosis

    Directory of Open Access Journals (Sweden)

    Rajendra Nath

    2012-01-01

    Conclusion: Operative treatment in patients of degenerative lumbar canal stenosis yields excellent results as observed on the basis of JOA scoring system. No patient got recurrence of symptoms of nerve compression.

  18. Optimal volume of local anaesthetic for the adductor canal block

    DEFF Research Database (Denmark)

    Jæger, P.; Jenstrup, M. T.; Lund, J.;

    2015-01-01

    Background: Theoretically, the ideal volume of local anaesthetic for adductor canal block (ACB) would ensure sufficient filling ofthe canal and avoid proximal spread to the femoral triangle. In this dose-finding study, we aimed to investigate the minimaleffective volume for an ACB needed to fill...... the adductor canal distally in at least 95% of patients (ED95). Methods: We performed a blinded trial, enrolling 40 healthy men. All subjects received an ACB with lidocaine 1%. Volumes wereassigned sequentially to the subjects using the continual reassessment method followed by Bayesian analysis to determine...... theED95. Distal filling of the adductor canal was assessed by magnetic resonance imaging (primary outcome). Secondary outcomeswere the effect of volume on proximal spread to the femoral triangle (also assessed by magnetic resonance imaging), quadricepsmuscle weakness (decrease by ≥25% from baseline...

  19. Lipoma causing Guyon's canal syndrome: a case report and review

    Directory of Open Access Journals (Sweden)

    Narayanathu Chellappantilla Sreekumar

    2014-12-01

    Full Text Available Compression of the ulnar nerve in Guyon's canal leads to Guyon's canal syndrome. Lipoma is a rare cause of such compressions with only 12 cases reported previously. We report a 55-year-old man who presented with swelling in the left hand with decreased sensation in the ring and little fingers. Magnetic resonance imaging revealed high signals in T1-weighted and T2-weighted images with suppression of the short T1 inversion recovery signal, suggestive of lipoma. On exploration a well-encapsulated, dumbbell-shaped, fatty tumor was seen in the hypothenar space and Guyon's canal. The tumor was enucleated in toto. At 6-month follow-up, the patient had fully regained sensation. A review of the literature is presented for similar cases where a lipoma was the cause of Guyon's canal syndrome.

  20. Canals in the Roof of the Pharynx :Anatomic Study and their Clinical Meaning

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    1 IntroductionThe palatovaginal canal and the vomerovaginal canal are small canals which connect the roof of the nasopharynx to the posterior wall of the pterygopalatine fossa. The pterygopalatine fossa represents a major pathway for spread of malignant tumors and infections. In most of the classic anatomy texts brief descriptions of the palatovaginal canal and the vomerovaginal canal are provided. There is still a scarcity of studies comparing the radiologic and microdissection findings~([1]). The aim of t...

  1. "Estudo comparativo da resistência à infiltração que diferentes materiais resinosos utilizados na cimentação de retentores intra-radiculares oferecem à passagem de fluidos que atravessam a dentina"

    OpenAIRE

    Marcio Katsuyoshi Mukai

    2005-01-01

    O Objetivo deste estudo é avaliar in vitro, a resistência que diferentes materiais resinosos têm a passagem de fluidos que atravessam a dentina na ausência de cemento radicular. Foram utilizados 60 dentes humanos cedidos pelo banco de dentes da FOUSP. Os dentes foram submetidos a tratamento endodôntico segundo a técnica de Paiva e Antoniazzi e armazenados a uma temperatura de 37°C em umidade 100% por 24 horas para o preparo do retentor intra -radicular respeitando o limite apical de 4 mm. Os ...

  2. Avaliação da centralização do preparo biomecânico em canais radiculares preparados com os sistemas ProTaper UniversalTM, ProfileTM e Twisted FileTM

    OpenAIRE

    de Andrade Mendes, Daniela

    2010-01-01

    O conhecimento da morfologia interna do sistema de canais radiculares e suas diversas conformações têm um importante papel no sucesso da terapia endodôntica. A familiarização com as curvaturas torna-se importante para execução de um correto planejamento do preparo biomecânico dos canais radiculares escolhendo técnicas e instrumentos apropriados para cada situação, uma vez que a manutenção da sua anatomia original é de suma importância para o sucesso da terapêutica aplicada. O preparo biomecân...

  3. Avaliação da conformação do preparo biomecânico de canais radiculares instrumentados com os sistemas rotatórios Hero 642®, Hero Shaper® e Hero Aplical®

    OpenAIRE

    Cruz Câmara, Andréa

    2006-01-01

    O objetivo desta pesquisa foi avaliar a conformação do preparo biomecânico de canais radiculares, por meio de imagens pré e pós-operatórias da secção transversal dos terços cervical, médio e apical. Cinquenta canais mésio-vestibulares de primeiros molares inferiores humanos foram divididos aleatoriamente em 5 grupos com 10 espécimes. No grupo 1, os canais radiculares foram instrumentados com o sistema HERO 642®; no grupo 2 com o sistema HERO 642® associado ao sistema HERO Ap...

  4. CT findings of the osteoma of the external auditory canal

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Ha Young; Song, Chang Joon; Yoon, Chung Dae; Park, Mi Hyun; Shin, Byung Seok [Chungnam National University, School of Medicine, Daejeon (Korea, Republic of)

    2006-07-15

    We wanted to report the CT image findings of the osteoma of the external auditory canal. Temporal bone CT scanning was performed on eight patients (4 males and 4 females aged between 8 and 41 years) with pathologically proven osteoma of the external auditory canal after operation, and the findings of the CT scanning were retrospectively reviewed. Not only did we analyze the size, shape, distribution and location of the osteomas, we also analyzed the relationship between the lesion and the tympanosqumaous or tympanomastoid suture line, and the changes seen on the CT scan images for the patients who were able to undergo follow-up. All the lesions of the osteoma of the external auditory canal were unilateral, solitary, pedunculated bony masses. In five patients, the osteomas occurred on the left side and for the other three patients, the osteomas occurred on the right side. The average size of the osteoma was 0.6 cm with the smallest being 0.5 cm and the largest being 1.2 cm. Each of the lesions was located at the osteochondral junction in the terminal part of the osseous external ear canal. The stalk of the osteoma of the external auditory canal was found to have occurred in the anteroinferior wall in five cases (63%), in the anterosuperior wall (the tympanosqumaous suture line) in two cases (25%), and in the anterior wall in one case. The osteoma of the external auditory canal was a compact form in five cases and it was a cancellous form in three cases. One case of the cancellous form was changed into a compact form 35 months later due to the advanced ossification. Osteoma of the external auditory canal developed in a unilateral and solitary fashion. The characteristic image findings show that it is attached to the external auditory canal by its stalk. Unlike our common knowledge about its occurrence, osteoma mostly occurred in the tympanic wall, and this is regardless of the tympanosquamous or tympanomastoid suture line.

  5. Bifid mandibular canal: a rare or underestimated entity?

    Directory of Open Access Journals (Sweden)

    Ibrahim Nasseh

    2016-10-01

    Full Text Available One of the rare anatomical variations that can be of significant importance for the dentist is the bifid mandibular canal. Many complications can occur from this condition such as failure of anesthesia when performing inferior alveolar nerve block, difficulties during the surgical extraction of the third mandibular molar, and during implants placement. Therefore, good knowledge of this condition is essential. In this report, we describe the radiographic finding of a unilateral bifid mandibular canal.

  6. Reformado de presas y canales del Sena inferior

    Directory of Open Access Journals (Sweden)

    Moineau, L.

    1962-03-01

    Full Text Available El programa de reforma y acomodación de las presas y canales existentes en el bajo Sena (Francia acaba de experimentar un nuevo impulso. Este reformado, actualmente en ejecución entre Poissy y N. D. de La Garenne, consiste en la unión de los canales de La Garenne y Port-Villez, de un lado, y de Méricourt y Maulan, de otro.

  7. Rare case of gastrointestinal stromal tumor of the anal canal

    Directory of Open Access Journals (Sweden)

    Madhu Kumar

    2013-01-01

    Full Text Available Gastrointestinal stromal tumor (GIST is a rare mesenchymal neoplasm of the gastrointestinal tract. GIST of anal canal is very rare representing only 3% of all anorectal mesenchymal tumors. We report an extremely rare case of GIST of the anal canal in 60-years-old man with history of irregular bowel habits with dark colored stool mixed with blood and constipation from 6 month. Diagnosis was made on the basis of histomorphological and immunohistochemical examination.

  8. Could spinal canal compression be a cause of polyneuropathy?

    Directory of Open Access Journals (Sweden)

    Richard Bostelmann

    2016-04-01

    Full Text Available Causality between spinal cord compression and polyneuropathy is difficult to define, especially under the circumstances that polyneuropathy can have many causes. Seven patients with spinal cord compression and electrophysiological signs of polyneuropathy were treated surgically on decompression of their spinal canal stenosis in the time from April 2010 to January 2013. Median follow up time was 9 months (2-23 months. Causes of polyneuropathy were: 1 patient with methotrexate-induced polyneuropathy, 1 endocrine-dysfunction-induced, 2 with diabetic- polyneuropathy, and 3 patients had unknown reasons. The localization of the spinal canal stenosis was also varying: 2 patients suffered of cervical spinal canal stenosis and 5 of lumbar. Decompressive surgery led to pain relieve in all patients initially. Surprisingly, also symptoms of polyneuropathy seemed to regress in all 7 patients for the first 5 months after surgery, and in 5 patients for the time of 9 months after surgery. There are two points we would like to emphasize in this short report. Since 5/7 patients with polyneuropathy and spinal canal stenosis improved clinically after surgery, surgery has a place in the treatment of such a combined pathology. Since it seems to be a possible causality between polyneuropathy of unknown origin and spinal cord stenosis, decompression of the spinal canal could also be a therapeutic step in a specific kind of polyneuropathy. Which patients could possibly have a spinal canal stenosis induced polyneuropathy remains a subject of further studies.

  9. Root canal preparation in endodontics: conventional versus laser methods

    Science.gov (United States)

    Goodis, Harold E.; White, Joel M.; Marshall, Sally J.; Marshall, Grayson W.; Moskowitz, Emrey

    1992-06-01

    Conventional cleaning and shaping of root canal systems employs hand and/or rotary instrumentation to remove the contents of the canal and shape the canal to receive a filling material. With the advent of the Nd:YAG laser system another method of accomplishing proper cleaning and shaping is evaluated. Single rooted teeth were radiographed bucco- lingually and mesio-distally and were divided into 2 groups. The first group was accessed and the root canal systems cleaned and shaped with a step back technique utilizing hand files and gates glidden burs. At completion of the procedure the teeth were again radiographed at the same positions as those prior to the procedure. The teeth were split longitudinally and examined under scanning electron microscopy to assess cleaning. The second group of teeth were accessed, and cleaning and shaping was accomplished using the Nd:YAG laser in combination with hand files and rotary instruments. These teeth were subjected to the same analysis as those in the first group. The before and after radiographs of each group were subjected to image analysis to determine effectiveness of the two methods in shaping the canal systems. We will discuss the ability of Nd:YAG to clean and shape root canal spaces and remove smear layer and organic tissue remnants from those areas.

  10. Verrucous Carcinoma in External Auditory Canal – A Rare Case

    Directory of Open Access Journals (Sweden)

    Md Zillur Rahman

    2013-05-01

    Full Text Available Verrucous carcinoma is a variant of squamous cell carcinoma. It is of low grade malignancy and rarely present with distant metastasis. Oral cavity is the commonest site of this tumour, other sites are larynx, oesophagus and genitalia. Verrucous carcinoma in external auditory canal is extremely rare. This is the presentation of a 45 years old woman who came to the ENT & Head Neck Surgery department of Delta medical college, Dhaka, Bangladesh with discharging left ear and impairment of hearing on the same side for 7 years. Otoscopic examination showed a mass occupying almost whole of the external auditory canal and the overlying skin was thickened, papillary and blackish. Cytology from external auditory canal scrap showed hyperkeratosis and parakeratosis. External auditory canal bone was found eroded at some parts. Excision of the mass was done under microscope. Split thickness skin grafting was done in external auditory canal. The mass was diagnosed as verrucous carcinoma on histopathological examination. Afterwards she was given radiotherapy. Six months follow up showed no recurrence and healthy epithelialization of external auditory canal.

  11. Long-term cytotoxic effects of contemporary root canal sealers

    Directory of Open Access Journals (Sweden)

    Emmanuel Joao Nogueira Leal da SILVA

    2013-03-01

    Full Text Available Objectives The aim of the present study was to investigate the effects of root canal sealers on the cytotoxicity of 3T3 fibroblasts during a period of 5 weeks. Material and Methods Fibroblasts (3T3, 1×105 cells per well were incubated with elutes of fresh specimens from eight root canal sealers (AH Plus, Epiphany, Endomethasone N, EndoREZ, MTA Fillapex, Pulp Canal Sealer EWT, RoekoSeal and Sealapex and with elutes of the same specimens for 5 succeeding weeks after immersing in simulated body fluid. The cytotoxicity of all root canal sealers was determined using the MTT assay. Data were analyzed using ANOVA and Tukey's test. Results RoekoSeal was the only sealer that did not show any cytotoxic effects (p<0.05. All the other tested sealers exhibited severe toxicity initially (week 0. MTA Fillapex remained moderately cytotoxic after the end of experimental period. Toxicity of the other tested sealers decreased gradually over time. The evaluated root canal sealers presented varying degrees of cytotoxicity, mainly in fresh mode. Conclusions RoekoSeal had no cytotoxic effect both freshly mixed and in the other tested time points. MTA Fillapex was associated with significantly less cell viability when compared to the other tested root canal sealers.

  12. Computed Tomography Evaluation of Canal Transportation and Volumetric Changes in Root Canal Dentin of Curved Canals Using Mtwo, ProTaper and ProTaper Next Rotary System-An In-vitro Study

    Science.gov (United States)

    Shivashankar, Mayuri Biccodu; Jayasheel, Arun; Kenchanagoudra, Mallikarjun Goud

    2016-01-01

    Introduction Complete cleaning and shaping of root canal system is of paramount importance to achieve a successful root canal treatment. There are various rotary Ni-Ti systems available in the market to achieve mechanical goal of root canal preparation. But aggressive preparation of root canal with such systems would result in canal transportation and excess root dentin removal that would be one of the major reasons to decide the prognosis of root canal treated tooth. Aim The present study was conducted to compare the root canal preparation in terms of canal transportation and volumetric changes in the root canal dentin among three Ni-Ti file systems, namely Mtwo, ProTaper (PT) and ProTaper NEXT (PTN) file system, using Computed Tomography (CT). Materials and Methods A total of 45 mesiobuccal root canals of extracted first molar teeth with completely formed root apices and angle of curvature ranging between 10°- 35° were selected. These teeth were randomly divided into three experimental groups containing 15 teeth each, based on rotary system used. Group-I: Mtwo files, Group-II: PT files and Group-III: PTN files. Pre-instrumentation CT images were obtained at three cross-sectional planes – 3mm, 7mm and 11mm from apical end of the root. Similarly, post-instrumentation images were obtained. Shortest distance from the edge of the canal to the periphery of the root was analyzed by using Analysis of Variance. Results All three file systems tested in the present study presented similar behaviour with respect to the root canal transportation. Lesser canal transportation was recorded in Mtwo. But no statistically significant difference was seen in terms of canal transportation and volume of dentin removed between all three rotary systems (p>0.05). Conclusion Mtwo, PT and PTN rotary systems have similar behaviour with respect to canal transportation and volume of dentin removed. PMID:28050495

  13. Comparison of the cleaning efficacy of the FKG race system and hand instrument in molar root canal Comparação da eficácia de limpeza entre o sistema FKG race e instrumentos manuais em molares inferiores

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    Carla Renata Sipert

    2006-01-01

    Full Text Available INTRODUCTION AND OBJECTIVE: The aim of this study was to evaluate the ability of root canal cleaning of the RaCe rotary instrumentation system (FKG Dentaire - La-Cheaux-de Fonds - Switzerland, compared to manual filing with Stainless Steel K-files (Maillefer Instruments - Ballaigues - Switzerland. MATERIAL AND METHOD: Twenty extracted human teeth (maxillary molars were selected and their pulp tissue was removed after coronal access. The root canals were filled with a dye (India ink and allowed to dry for 48 hours, followed by establishment of the working length of the mesiobuccal root; then, half of the specimens were instrumented by the modified Oregon technique and the other half were instrumented by crown-down sequence of the RaCe system. After preparation, the teeth were longitudinally sectioned and evaluated according to the amount of remaining dye. RESULTS: Data obtained were registered as numerical scores, and the arithmetic means were compared between groups using the Mann Whitney test. Both techniques were unable to completely clean the interior of the root canals, with a better performance of the manual technique only at the middle third. CONCLUSION: It could be concluded that the RaCe system was able to provide satisfactory cleaning, similar to that obtained by the manual instrumentation technique.Objetivo deste trabalho foi avaliar a capacidade de limpeza de canais radiculares por meio do sistema de instrumentação RaCe (FKG Dentaire - La-Cheaux-de Fonds - Suíça em comparação à instrumentação manual por meio de limas tipo K-File (Maillefer Instruments - Ballaigues - Suíça. Foram selecionados 20 dentes humanos extraídos (molares superiores que tiveram seu conteúdo radicular removido após realização da abertura coronária. Os canais foram preenchidos com corante (tinta nanquim e após 48 horas para secagem, realizou-se a odontometria da raiz mésio-vestibular. Metade dos espécimes foi instrumentada pela técnica de

  14. Significance of temporal bone CT scan for exposure of the facial canal and the lateral semicircular canal in cholesteatoma

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    Sung, Ki Joon; Kim, Dong Jin; Kim, Myung Soon; Kim, Young Ju; Kweon, Joon [Wonju College of Medicine, Yonsei University, Wonju (Korea, Republic of)

    1991-09-15

    By reviewing retrospectively the HRCT findings in 130 surgically proven cases of chronic otitis media with cholesteatoma, we estimated the sensitivity, specificity, and positive predictability of the HRCT compared to surgical findings. For exposure of the facial canal, the sensitivity, specificity, and positive predictability was 59.7%, 84.9%, and 85.2% respectively. For exposure of the lateral semicircular canal, the sensitivity was 80.6%, the specificity 99.0%, and the positive predictability 96.2%. Conclusively, the diagnostic accuracy of preoperative temporal bone CT regarding the state of the lateral semicircular canal seems to be highly reliable. Gross invasion of the facial canal can be usually detected. However, relatively low sensitivity suggests that evaluation of the ultra-thin structures of the tympanic segment is often problematic.

  15. Cholesteatoma invasion into the internal auditory canal.

    Science.gov (United States)

    Migirov, Lela; Bendet, Erez; Kronenberg, Jona

    2009-05-01

    Cholesteatoma invasion into the internal auditory canal (IAC) is rare and usually results in irreversible, complete hearing loss and facial paralysis on the affected side. This retrospective study examines the clinical characteristics of seven patients with cholesteatoma invading the IAC, analyzes possible routes of the cholesteatoma's extension and describes the surgical approaches used and patient outcome. Extension to the IAC was via the supralabyrinthine route in most patients. A subtotal petrosectomy, a translabyrinthine approach or a middle cranial fossa approach combined with radical mastoidectomy were required for the complete removal of the cholesteatoma. All seven patients presented with some preoperative facial nerve palsy. The facial nerve was decompressed in four patients and facial nerve repair was performed in three others, two by hypoglossal-facial anastomosis and one by a greater auricular nerve interposition grafting. All patients ended up with total deafness in the operate ear. At 1 year following surgery, the facial nerve function was House-Brackmann grade III in six cases and grade II in one. In conclusion, cholesteatoma invading the IAC is a separate entity with characteristic clinical presentations, require a unique surgical approach, and result in significant morbidity, such as total deafness in the operated ear and impaired facial movement.

  16. Radiotherapy of epidermoid anal canal cancer.

    Science.gov (United States)

    Dobrowsky, W

    1989-01-01

    Forty-eight patients with anal canal cancers were treated with surgery and irradiation or irradiation alone during the period 1970-1982. All cases were treated by external megavoltage equipment. The overall 5-year survival was 50%, and the local recurrence rate 33%. According to the therapy, four major groups were analysed: radical surgery followed by post-operative irradiation (5-year survival 43%, local recurrence rate 38%), incomplete major surgery and post-operative irradiation with very inferior prognosis (none of the patients surviving beyond 52 months). Two groups of patients had sphincter-saving procedures: local surgery followed by irradiation (5-year survival 78%, local recurrence rate 22%) and primary irradiation (5-year survival 57%, local recurrence rate 14%). Lymph node positive patients showed a median survival of 24.5 months against 52 months in N0 cases (5-year survival 21% against 50%). Side-effects of radiotherapy were transient and mild, and no late severe sequelae were seen. The data indicate that post-operative external radiotherapy seems insufficient and unable to decrease the local recurrence rate, especially when surgery is incomplete. Both spincter-saving surgery and radiotherapy, as well as primary irradiation, are effective treatment modalities. These data are analysed and future aspects considering combined radiochemotherapy are discussed.

  17. Retrograde seal in ultrasonically prepared canals.

    Science.gov (United States)

    Sutimuntanakul, S; Worayoskowit, W; Mangkornkarn, C

    2000-08-01

    The sealing ability of various retrofilling materials was compared. The root canals of 85 single-rooted teeth were cleansed and obturated with gutta-percha without sealer using lateral condensation. The apical 3 mm of the roots were resected and divided into positive control, negative control, and five experimental groups. The experimental teeth received root-end cavity preparation to 3 mm depth using an ultrasonic retroprep tip. The retrocavities were dried and divided into five groups to receive the following materials: amalgam with varnish, amalgam with Clearfil Liner Bond II, thermoplasticized gutta-percha (TGP) with sealer, Ketac-fil, and Super-EBA. After immersion in India ink for 7 days, the roots were demineralized, cleared, and evaluated for dye leakage under a stereomicroscope. Statistical analysis showed that Super-EBA, Ketac-fil, and TGP with sealer demonstrated less leakage than amalgam with varnish and amalgam with Clearfil Liner Bond II (p fil or TGP sealer (p fil and TGP or between the two groups filled with amalgam (p > 0.05).

  18. Sistema radicular do fórmio, sisal e bambu imperial Root systems of new zealand flax, sisal, and imperial bamboo

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    Júlio César Medina

    1963-01-01

    Full Text Available Os autores apresentam e discutem os resultados de estudos preliminares sôbre o sistema radicular do fórmio (Phormium tenax Forster, sisal (Agave sisalana Perrine e bambu .imperial (Bambusa vulgaris Schrad. var. vittata A. ,& C, Riv.. Concluem, que o sistema radicular do fórmio é relativamente raso, o do sisal bastante superficial é o do bambu imperial se limitada às primeiras carnadas do solo.Results of preliminary studies on root-systems of New Zealand flax (Phormium tenax Forster, sisal (Agave sisalana Perrine, and imperial bamboo (Bambusa vulgaris Schrad. var. vittata A. & C. Riv. plants by the method of soil block, are apresented and discussed by the authors. According to local soil conditions, it is concluded that the root-system of New Zealand flax is relatively superficial, with the main concentration of roots in the 12 in. soil top layer. In sisal, the root-systems of the three plants investigated were found to occur in the soil surface layer, with more of 90% of the roots in the top 6 in. Finally, in the imperial bamboo clump atudied, the main concentration of roots was found in the layer 6-12 in. deep.

  19. Effects of two combinations of triple antibiotic paste used in endodontic regeneration on root microhardness and chemical structure of radicular dentine.

    Science.gov (United States)

    Prather, Blake T; Ehrlich, Ygal; Spolnik, Kenneth; Platt, Jeffrey A; Yassen, Ghaeth H

    2014-12-01

    We investigated the effects of triple antibiotic paste (TAP) and modified triple antibiotic paste (MTAP) concentrations on the microhardness and chemical structure of radicular dentine. Human root cylinders were instrumented and randomized into four treatment groups and an untreated control group. Two treatment groups received 1 g/mL TAP or MTAP, and the other two treatment groups received 1 mg/mL methylcellulose-based TAP or MTAP. Cylinders were stored at 100% relative humidity for 4 weeks. Each root cylinder was subjected to a microhardness test before and after treatment. Different sets of radicular dentine specimens were treated as mentioned previously, and were examined using attenuated total reflection Fourier transform infrared spectroscopy. All treatment groups showed significant reductions in microhardness of roots when compared to untreated control roots at 1,000 and/or 500 µm from the pulp-dentine interface. However, 1 mg/mL methylcellulose-based antibiotics caused significantly less reduction in microhardness when compared to 1 g/mL antibiotics. In addition, 1 g/mL TAP and DAP caused significantly lower phosphate/amide I ratios when compared to other groups. The use of 1 mg/mL methylcellulose-based TAP and MTAP may minimize the reduction in microhardness of roots compared with the currently used 1 g/mL concentration of these antibiotics.

  20. Cuarta Parte. Pudriciones Fungosas Radiculares del Fríjol en Valle de Medellín Colombia

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    Cárdona Álvarez Canúto

    1954-11-01

    Full Text Available Aunque una gran parte de este estudio ha sido consagrada a la descripción de métodos, estructuras de los patógenos, clasificaciones, análisis de experimentos. El interés principal yace en: 1 Determinación de la etiología de las pudriciones radiculares, 2 en el conocimiento de la reacción (susceptibilidad o resistencia de algunas variedades a esos agentes etiológicos, 3 en la estimación de las pérdidas ocasionadas por esos mismos organismos y 4 en la apreciación de la dispersión de los patógenos en los plantíos de fríjol. En los capítulos anteriores se dio buena evidencia de la existencia de un grupo, más bien grande, de hongos que pueden reducir considerablemente los rendimientos en las cosechas de fríjol. Dichos hongos en su mayoría son los mismos que han sido registrados como agentes patógenos de esta planta en otros países, y que aparecen con mucha frecuencia citados en la literatura sobre enfermedades. Con los hongos clasificados como altamente patógenos, se probó la forma de reacción de 8 variedades de las comerciales de Antioquia a dichos organismos, tomando en consideración el efecto de los patógenos sobre la semilla en estado pre-emergente y post-emergente. De los estudios hechos se desprende claramente que hay diferencia, en el estado de pre-emergencia e la reacción de post-emergencia, es decir, las variedades probadas son igualmente susceptibles en estado de planta, a los patógenos usados en el experimento, pero algunas son más susceptibles o más resistentes en el estado de semilla.

  1. Cirugía endodóntica con obturación simultánea del conducto radicular: caso atípico

    OpenAIRE

    Gisselle Moraima CHÁVEZ-ANDRADE; Sousa, Rosymeire Freitas de [UNESP; Kuga, Milton Carlos [UNESP; Faria-Júnior, Norberto Batista de [UNESP; FARIA, Gisele; Só, Marcus Vinicius Reis

    2014-01-01

    The apical surgery with simultaneous root filling consists in the elimination of the local etiologic factors concomitant with the shaping and obturation of the root canal system. This technique is indicated when there is no possibility of obturating the root canal by conventional methods. Some adverse factors may difficult the clinical procedures, such as the radiographic interpretation. Periapical radiographs must not be used as the main diagnostic resource due to their inherent disadvantage...

  2. Hereditariedade e suscetibilidade à reabsorção radicular em Ortodontia não se fundamentam: erros metodológicos e interpretativos repetidamente publicados podem gerar falsas verdades. Análise crítica do trabalho de Al-Qawasmi et al.² sobre a predisposição genética à reabsorção radicular de natureza ortodôntica Heredity and susceptibility to radicular resorption in Odontology do not base: methodological and interpretative repeatedly published mistakes can generate false truths. Critical analysis of Al-Qawasmi work about genetics predisposition to radicular reabsorption of orthodontic kind

    Directory of Open Access Journals (Sweden)

    Alberto Consolaro

    2004-05-01

    Full Text Available O trabalho de Al-Qawasmi et al.², publicado em agosto de 2003 no periódico Journal of Dental Research, procurou estabelecer um gene candidato para a hereditariedade e predisposição genética nas reabsorções dentárias em Ortodontia, mas apresentou e repetiu algumas limitações metodológicas e equívocos na interpretação de seu trabalho anterior de março de 2003¹. Nas conclusões afirmam explicitamente que os achados são preliminares e sugestivos, necessitando de confirmação por meio de estudos adicionais. Os resultados são correlacionados fundamentando-se em dados de outros autores sobre síndromes ósseas associadas a reabsorções por substituição, cervicais externas e não com as reabsorções radiculares externas apicais induzidas ortodonticamente. O gene da reabsorção radicular externa apical relacionada a tratamentos ortodônticos não foi determinado e muito menos a sua natureza hereditária. Nem tampouco, a suscetibilidade à reabsorção radicular em Ortodontia foi detectada ou provada. O trabalho analisado e os demais relacionados com o mesmo tema não conseguiram comprovar suas hipóteses porque ignoram que o primeiro passo para a reabsorção radicular externa é a destruição da camada cementoblástica e isto apenas ocorre a partir da ação de fatores locais. Analisando criticamente estes trabalhos podemos afirmar que procurar o gene da reabsorção radicular e da suscetibilidade a partir de pesquisas em mediadores e células clásticas demonstra a falta de um conhecimento completo e amplo da etiopatogenia deste importante fenômeno biológico, imprescindível para o estabelecimento da premissa dos trabalhos.The study of Al-Qawasmi et al.² published in August 2003 on Journal of Dental Research, aimed to establish a candidate gene for heritability and genetic predisposition to external root resorption in orthodontic patients. This paper, however, presents and repeated some methodological faults and equivocated

  3. Mejoras en el canal de Panamá

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    Brandl, Charles McG.

    1963-07-01

    Full Text Available The Panama Canal, together with the Suez Canal, is an engineering accomplishment which is now regarded as a master work marking the initiation of modern civil engineering. Other projects, also of great magnitude, do not seem to maintain the reputation of the above two, because they cannot continue to serve their function with sustained usefulness in the new circumstances of today. The Panama Canal, with its limited dock capacity, and the narrow, so called Serpent, canal, has had to cope with a continuously increasing volume of shipping traffic; a natural consequence of commercial evolution. In order to keep up with these increasing demands, it has been necessary to carry out an almost uninterrupted series of modifications and improvements, affecting both the method of operation and organisation, and the actual nature of the canal. Thanks to these alterations the Panama Canal has continued to maintain, at least nominally, an adequate standard of functional efficiency. At present the canal is being widened over certain sections to enable the easy passage of ships of great displacement. The work is being done very rapidly, and in order to gain time, it has been distributed to various contractors simultaneously.El canal a través del ismo de Panamá es una obra de ingeniería civil que, junto con el de Suez, empiezan ya a clasificarse como obras maestras que señalan el primer jalón del desarrollo de la ingeniería moderna. Otras obras, también importantes, no conservan, sin embargo, la misma reputación que aquéllas, por no seguir un paralelismo con las exigencias en cada época. El canal de Panamá, con sus exclusas, y angosto paso llamado de la. Culebra, ha tenido que afrontar un tráfico creciente de navíos que siguen la evolución del tiempo. Para conseguir este paralelismo, tanto el material de explotación como la organización, dragados y mejoras, han tenido que conocer una sucesión ininterrumpida de modificaciones que han permitido

  4. Assessment of the wetting behavior of three different root canal sealers on root canal dentin

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    Muralidhar Tummala

    2012-01-01

    Full Text Available Aim: The objective of the present study was to evaluate and compare the wetting behavior of three different root canal sealers on the root canal dentin surface treated with irrigants and their combination. Materials and Methods: Decoronation and apical third resections of 27 extracted single-rooted human mandibular premolars were done. The roots were then split longitudinally into two halves, and randomly assigned into three treatment groups (n=18. The root dentin surfaces in Group1, Group 2 and Group 3 were treated with 17% ethylene diamine tetra acetic acid (EDTA, 3% sodium hypochlorite (NaOCl and combination of 17% EDTA and 3% NaOCl, respectively. Each group was subdivided into three subgroups of 6 specimens each, depending on the the sealer used, i.e. sub group A. zinc oxide (ZnOE, sub group B. AH plus, subgroup C. Guttaflow sealer, respectively. The contact angle was measured using First Ten Angstroms (FTA 200 dynamic contact angle analyzer. Results: The contact angle values for AH Plus sealer were significantly lower when compared to the other two sealer groups. Conclusion: The wettability of AH Plus sealer on the root surface dentin was found to be better than Gutta-Flow and ZnOE sealer.

  5. Cervical spinal canal narrowing and cervical neurologi-cal injuries

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    ZHANG Ling

    2012-04-01

    Full Text Available 【Abstract】Cervical spinal canal narrowing can lead to injury of the spinal cord and neurological symptoms in-cluding neck pain, headache, weakness and parasthesisas. According to previous and recent clinical researches, we investigated the geometric parameters of normal cervical spinal canal including the sagittal and transverse diameters as well as Torg ratio. The mean sagittal diameter of cervical spinal canal at C 1 to C 7 ranges from 15.33 mm to 20.46 mm, the mean transverse diameter at the same levels ranges from 24.45 mm to 27.00 mm and the mean value of Torg ratio is 0.96. With respect to narrow cervical spinal canal, the following charaterstics are found: firstly, extension of the cervical spine results in statistically significant stenosis as compared with the flexed or neutral positions; secondly, females sustain cervical spinal canal narrowing more easily than males; finally, the consistent narrowest cervical canal level is at C 4 for all ethnicity, but there is a slight variation in the sagittal diameter of cervical spinal stenosis (≤14 mm in Whites, ≤ 12 mm in Japanese, ≤13.7 mm in Chinese. Narrow sagittal cervical canal diameter brings about an increased risk of neurological injuries in traumatic, degenerative and inflam-matory conditions and is related with extension of cervical spine, gender, as well as ethnicity. It is hoped that this re-view will be helpful in diagnosing spinal cord and neuro-logical injuries with the geometric parameters of cervical spine in the future. Key words: Spinal cord injuries; Spinal stenosis; Trauma, nervous system

  6. Cervical spinal canal narrowing and cervical neurological injuries

    Institute of Scientific and Technical Information of China (English)

    ZHANG Ling; CHEN Hai-bin; WANG Yi; ZHANG Li-ying; LIU Jing-cheng; WANG Zheng-guo

    2012-01-01

    Cervical spinal canal narrowing can lead to injury of the spinal cord and neurological symptoms including neck pain,headache,weakness and parasthesisas.According to previous and recent clinical researches,we investigated the geometric parameters of normal cervical spinal canal including the sagittal and transverse diameters as well as Torg ratio.The mean sagittal diameter of cervical spinal canal at C1 to C7 ranges from 15.33 mm to 20.46 mm,the mean transverse diameter at the same levels ranges from 24.45 mm to 27.00 mm and the mean value of Torg ratio is 0.96.With respect to narrow cervical spinal canal,the following charaterstics are found:firstly,extension of the cervical spine results in statistically significant stenosis as compared with the flexed or neutral positions; secondly,females sustain cervical spinal canal narrowing more easily than males;finally,the consistent narrowest cervical canal level is at C4 for all ethnicity,but there is a slight variation in the sagittal diameter of cervical spinal stenosis(≤ 14 mm in Whites,≤12 mm in Japanese,≤ 13.7 mm in Chinese).Narrow sagittal cervical canal diameter brings about an increased risk of neurological injuries in traumatic,degenerative and inflammatory conditions and is related with extension of cervical spine,gender,as well as ethnicity.It is hoped that this review will be helpful in diagnosing spinal cord and neurological injuries with the geometric parameters of cervical spine in the future.

  7. Topographical evaluation of the mandibular canal through panoramic radiograph

    Directory of Open Access Journals (Sweden)

    Ingrid Macedo Oliveira

    2016-10-01

    Full Text Available The mandibular canal is located inside the body of the mandible and may have anatomical variations. The topographic knowledge of the mandibular canal by the Dental surgeons is fundamental to achieving success in surgical planning, anesthetics and clinical interventions involving the jaw. To study the anatomy of the mandibular canal through panoramic radiographs. A retrospective descriptive study, developed after review and approval by the Ethics and Research Committee with the number of opinion 431095. Were analyzed 252 panoramic radiographs of patients of male and female attended in dental clinics UNINOVAFAPI University Center, Teresina-Pi, Brazil. The radiographs were analyzed with the aid of a light box and each antimere the jaw was observed separately. The classification of Nortjé and Langlais for description of the topography of the mandibular canal were used. Descriptive statistical analysis was performed with SPSS version 18.0. There was a prevalence of 38.89% in both antimeres, of mandibular channel the Type II. The type IV was present in 25.4% in the right hemi-arch and 26.6% on the left. Mandibular canal with unilateral bifurcation was observed in 0.77% of the sample and molar straight channel has not been identified. We observed anatomical variations as for the number and path, of the mandibular canal with the highest prevalence of Types II and IV, and the absence of bifurcations. Most was mandibular channels showed no bifurcation. The panoramic radiograph showed up an aid important to identify the mandibular canal and its variations.

  8. Canal mandibular bífido: Presentación de una serie de casos Bifid mandibular canal: Case series report

    OpenAIRE

    C.L. Guzmán Zuluaga; I.C. Guzmán Zuluaga; C.M. Ardila Medina

    2012-01-01

    La ubicación y configuración de las variaciones del canal mandibular son relevantes en diferentes procedimientos clínicos de la mandíbula. En esta serie de casos un radiólogo evaluó el recorrido del canal mandibular identificando la presencia y tipos de canales bífidos. Se observaron cuatro pacientes con canal mandibular bífido tipo retromolar y tres sujetos con canal bífido tipo anterior sin convergencia. En otro paciente se encontraron forámenes dentarios bífidos bilaterales. La Tomografía ...

  9. Origin and evolution of the canal raphe system in diatoms.

    Science.gov (United States)

    Ruck, Elizabeth C; Theriot, Edward C

    2011-11-01

    One lineage of pennate diatoms has a slit through the siliceous cell wall, called a "raphe," that functions in motility. Raphid pennate diatoms number in the perhaps tens of thousands of species, with the diversity of raphe forms potentially matching this number. Three lineages-the Bacillariales, Rhopalodiales, and Surirellales-possess a complex and presumably highly derived raphe that is physically separated from the cell interior, most often by a set of siliceous braces. Because the relationship among these three lineages is unclear, the number of origins of the canal raphe system and the homology of it and its constitutive parts among these lineages, is equally unclear. We reconstructed the phylogeny of raphid pennate diatoms and included, for the first time, members of all three canal raphid diatom lineages, and used the phylogeny to test specific hypotheses about the origin of the canal raphe. The canal raphe appears to have evolved twice, once in the common ancestor of Bacillariales and once in the common ancestor of Rhopalodiales and Surirellales, which form a monophyletic group in our analyses. These results recommend careful follow-up morphogenesis studies of the canal raphe in these two lineages to determine the underlying developmental basis for this remarkable case of parallel evolution.

  10. [Anatomical names of foramina and canales in skeleton].

    Science.gov (United States)

    Shikano, S; Yamashita, Y

    1998-03-01

    Latin anatomical names of Foramina and Canales in skeleton were analyzed and compared with Japanese anatomical names for better understanding of the structures of the human body and for possible revision in the future. The conclusions were as follows: 1. In general, short tunnels were called Foramina (singular: Foramen), and long tunnels Canales (singular: Canalis). 2. One end of Canalis was sometimes called Foramen. In this case, Canalis and Foramen were usually modified by the same words. 3. Each name of Foramina contained the word which means form, state, absolute size, region of existence, one of the contents or function of Foramina. 4. Each name of Canales contained the word which means region of existence, one of the contents or function of Canales. 5. Some names of Foramina and Canales that were supposed to mean the region of existence meant one of the contents of the structures. 6. As for Latin anatomical names, the relation between words were relatively clear by the proper use of noun, adjective, nominative, and genitive. 7. Since different Chinese characters were sometimes pronounced similarly in Japanese anatomical names, different structures might be confused. 8. It seemed that some Japanese anatomical names needed partial correction.

  11. CT and MR Imagings of Semicircular Canal Aplasia

    Energy Technology Data Exchange (ETDEWEB)

    Shin, Chung Hee; Hong, Hyun Sook; Yi, Beom Ha; Cha, Jang Gyu; Park, Seong Jin; Kim, Dae Ho; Lee, Hae Kyung; Kim, Shi Chan [Soonchunhyang University Bucheon Hospital, Bucheon (Korea, Republic of)

    2009-07-15

    To evaluate the clinical, CT and MR imaging findings of semicircular canal (SCC) aplasia and to evaluate if a correlation exists between these findings and the associated anomalies or syndromes. This study retrospectively reviewed the CT and MRI findings of five patients with SCC aplasia. The CT and MR findings were analyzed for SCC, direction of facial nerve canal, cochlea, vestibule, oval or round window, middle ear ossicles, and internal auditory canal (IAC). The subjects included three boys and two girls ranging in age from one to 120 months (mean age; 51 months). Four of the subjects had the CHARGE syndrome, and one had the Goldenhar syndrome. Moreover, four subjects had sensorineural hearing loss and one had combined hearing loss. The course of the facial nerve canal was abnormal in all five cases. Moreover, trapped cochlea and dysplastic modiolus were each observed in one case. Four subjects had atresia of the oval window; whereas ankylosis of the ossicles was present in three subjects. IAC stenosis was present in one patient with the CHARGE syndrome. The aberrant course of the facial nerve canal, atresia of the oval window, and abnormal ossicles were frequently associated in patients with SCC aplasia. In addition, the Goldenhar and CHARGE syndromes were also commonly associated syndromes.

  12. Micro-Machined Flow Sensors Mimicking Lateral Line Canal Neuromasts

    Directory of Open Access Journals (Sweden)

    Hendrik Herzog

    2015-08-01

    Full Text Available Fish sense water motions with their lateral line. The lateral line is a sensory system that contains up to several thousand mechanoreceptors, called neuromasts. Neuromasts occur freestanding on the skin and in subepidermal canals. We developed arrays of flow sensors based on lateral line canal neuromasts using a biomimetic approach. Each flow sensor was equipped with a PDMS (polydimethylsiloxane lamella integrated into a canal system by means of thick- and thin-film technology. Our artificial lateral line system can estimate bulk flow velocity from the spatio-temporal propagation of flow fluctuations. Based on the modular sensor design, we were able to detect flow rates in an industrial application of tap water flow metering. Our sensory system withstood water pressures of up to six bar. We used finite element modeling to study the fluid flow inside the canal system and how this flow depends on canal dimensions. In a second set of experiments, we separated the flow sensors from the main stream by means of a flexible membrane. Nevertheless, these biomimetic neuromasts were still able to sense flow fluctuations. Fluid separation is a prerequisite for flow measurements in medical and pharmaceutical applications.

  13. Nanodiamond-Gutta Percha Composite Biomaterials for Root Canal Therapy.

    Science.gov (United States)

    Lee, Dong-Keun; Kim, Sue Vin; Limansubroto, Adelheid Nerisa; Yen, Albert; Soundia, Akrivoula; Wang, Cun-Yu; Shi, Wenyuan; Hong, Christine; Tetradis, Sotirios; Kim, Yong; Park, No-Hee; Kang, Mo K; Ho, Dean

    2015-11-24

    Root canal therapy (RCT) represents a standard of treatment that addresses infected pulp tissue in teeth and protects against future infection. RCT involves removing dental pulp comprising blood vessels and nerve tissue, decontaminating residually infected tissue through biomechanical instrumentation, and root canal obturation using a filler material to replace the space that was previously composed of dental pulp. Gutta percha (GP) is typically used as the filler material, as it is malleable, inert, and biocompatible. While filling the root canal space with GP is the standard of care for endodontic therapies, it has exhibited limitations including leakage, root canal reinfection, and poor mechanical properties. To address these challenges, clinicians have explored the use of alternative root filling materials other than GP. Among the classes of materials that are being explored as novel endodontic therapy platforms, nanodiamonds (NDs) may offer unique advantages due to their favorable properties, particularly for dental applications. These include versatile faceted surface chemistry, biocompatibility, and their role in improving mechanical properties, among others. This study developed a ND-embedded GP (NDGP) that was functionalized with amoxicillin, a broad-spectrum antibiotic commonly used for endodontic infection. Comprehensive materials characterization confirmed improved mechanical properties of NDGP over unmodified GP. In addition, digital radiography and microcomputed tomography imaging demonstrated that obturation of root canals with NDGP could be achieved using clinically relevant techniques. Furthermore, bacterial growth inhibition assays confirmed drug functionality of NDGP functionalized with amoxicillin. This study demonstrates a promising path toward NDGP implementation in future endodontic therapy for improved treatment outcomes.

  14. 33 CFR 207.640 - Sacramento Deep Water Ship Channel Barge Lock and Approach Canals; use, administration, and...

    Science.gov (United States)

    2010-07-01

    ... movement and position of all water traffic while at or near the locks and in the barge canals. (2... be raced or crowded alongside another in the barge canals. When entering the barge canals and...

  15. Estudo sobre a biocompatibilidade da polisulfona sob a forma de particulas e bastões

    OpenAIRE

    Pavanatti, Sergio Luiz; Zavaglia,Cecília Amélia de Carvalho; Belangero, William Dias; Kawano,Yoshio

    2001-01-01

    Foi estudada comparativamente a resposta do músculo tríceps sural e reto do abdome de ratos Wistar à implantação da polisulfona (PSU) e do polietileno de ultra alto peso molecular (UHMWPE ) sob a forma de bastões e partículas, por um período de até 52 semanas. Ao final, a PSU foi considerada como tendo a mesma biocompatibilidade do UHMWPE, segundo os critérios utilizados.

  16. Missão aduana brasileira, sob a ótica empresarial

    OpenAIRE

    2003-01-01

    An investigation about the mission of brazilian customs, mainly on its relationship with the economic activity, complemented by historical aspects ans views of other stackholders. Investigação sobre a missão da Aduana brasileira, sob a ótica de sua inserção na atividade econômica empresarial, complementada por considerações históricas e contemporâneas de outros atores.

  17. Benign paroxysmal positional vertigo simultaneously affecting several canals: a 46-patient series.

    Science.gov (United States)

    Soto-Varela, Andrés; Rossi-Izquierdo, Marcos; Santos-Pérez, Sofía

    2013-03-01

    Although it is uncommon for benign paroxysmal positional vertigo (BPPV) to affect more than one canal simultaneously, it is not exceptional. We attempt to determine whether these patients present differences relative to "single-canal" cases. A prospective study was done in patients with BPPV, divided into three groups: single-canal BPPV, multi-canal BPPV in one ear and multi-canal BPPV in both ears. Diagnosis was by Dix and Hallpike, supine roll and cephalic hyperextension tests. Treatment was according to the affected canals, by Semont, Epley, Lempert and Yacovino manoeuvres. Aetiology, sex, age, response to treatment, recurrence and final status in each of the three groups was evaluated. Five hundred and eighty-three patients were diagnosed with BPPV: 537 single-canal (92 %) and 46 multi-canal (8 %); of the latter, 36 bilateral and 10 unilateral cases. Basic differences between groups were: greater percentage of idiopathic cases in single-canal (p BPPV was more common in unilateral multi-canal (p = 0.006, Chi-square). No differences between groups in response to treatment, recurrence and final status were detected. There are aetiological differences between patients with single-canal BPPV, unilateral multi-canal BPPV and bilateral multi-canal BPPV. Response to therapeutic manoeuvres, however, shows that over 90 % of the patients in all the groups are cured.

  18. Síndrome de Deiscência de Canal Semicircular Superior Superior Canal Dehiscence Syndrome

    Directory of Open Access Journals (Sweden)

    Suzane da Cunha Ferreira

    2006-06-01

    Full Text Available A Síndrome de Deiscência de Canal Semicircular Superior (SDCSS, primeiramente descrita em 1998 por Minor et al., caracteriza-se por vertigem associada à presença de nistagmo, relacionados à exposição a estímulos sonoros intensos ou a modificações de pressão dentro da orelha média ou intracraniana. Disacusia, em sua maioria de padrão condutivo à audiometria tonal, também pode estar presente. Nesta revisão da literatura objetivou-se abordar a SDCSS, com seus principais sinais e sintomas, achados diagnósticos e tratamento, assim como enfatizar a importância de sua inclusão dentre as causas de vertigem, visto tratar-se de acometimento ainda pouco conhecido até mesmo entre especialistas. O diagnóstico correto, além de possibilitar seu tratamento, impede que abordagens diagnósticas e terapêuticas inapropriadas sejam realizadas.The Superior Canal Dehiscence Syndrome (SCDS was first reported by Minor at. Al. (1998, and has been characterized by vertigo and vertical-torsional eye movements related to loud sounds or stimuli that change middle ear or intracranial pressure. Hearing loss, for the most part with conductive patterns on audiometry, may be present in this syndrome. We performed a literature survey in order to to present symptoms, signs, diagnostic and therapeutic approaches to the SCDS, also aiming at stressing the great importance of including this syndrome among the tractable cause of vertigo. We should emphasize that this is a recent issue, still unknown by some specialists. The Correct SCDS diagnosis, besides enabling patient treatment, precludes misdiagnosis and inadequate therapeutic approaches.

  19. Commentaires sur la valeur piscicole du Canal de Roubaix (Nord

    Directory of Open Access Journals (Sweden)

    ARRIGNON J.

    1970-10-01

    Full Text Available La population piscicole du Canal de ROUBAIX a été inventoriée par pêche électrique. Trois passages, suivis chacun de l'enlèvement des poissons capturés, ont été opérés dans chacun des trois Secteurs d'inventaire. Le peuplement le plus probable ainsi estimé (par la méthode De Lury,est en rapport avec le degré de pollution du canal. On constate aussi queles poissons se cantonnent le long des berges, sur une largeur de 2 à 3mètres.L'estimation à l'hectare représente donc en réalité le stock d'une zone n'ayant que 25 % de la surface totale du Canal. Les poissons contrôlés sont pour la plupart des poissons de repeuplement.

  20. Bioceramic-Based Root Canal Sealers: A Review

    Science.gov (United States)

    Che Ab Aziz, Zeti A.

    2016-01-01

    Bioceramic-based root canal sealers are considered to be an advantageous technology in endodontics. The aim of this review was to consider laboratory experiments and clinical studies of these sealers. An extensive search of the endodontic literature was made to identify publications related to bioceramic-based root canal sealers. The outcome of laboratory and clinical studies on the biological and physical properties of bioceramic-based sealers along with comparative studies with other sealers was assessed. Several studies were evaluated covering different properties of bioceramic-based sealers including physical properties, biocompatibility, sealing ability, adhesion, solubility, and antibacterial efficacy. Bioceramic-based sealers were found to be biocompatible and comparable to other commercial sealers. The clinical outcomes associated with the use of bioceramic-based root canal sealers are not established in the literature. PMID:27242904

  1. Classification, mechanism and surgical treatments for spinal canal cysts

    Institute of Scientific and Technical Information of China (English)

    Jianjun Sun

    2016-01-01

    A variety of cystic lesions may develop in spinal canal. These cysts can be divided into intramedullary, intradural, extradural, cervical, thoracic, lumbar, and sacral cysts according to anatomical presentation, as well as arachnoid, meningeal, perineural, juxtafacet, discal, neurenteric cysts, and cyst-like lesions according to different etiologies. Mechanisms of initiation and growth vary for different cysts, such as congenital, trauma, bleeding, inflammatory, instability, hydrostatic pressure, osmosis of water, secretion of cyst wall, and one-way-valve effect, etc. Up to now, many treatment methods are available for these different spinal canal cysts. One operation method can be applied in cysts with different types. On the other hand, several operation methods may be utilized in one type of cyst according to the difference of location or style. However, same principle should be obeyed in surgical treatment despite of difference among spinal canal cysts, given open surgery is melely for symptomatic cyst. The surgical approach should be tailored to the individual patient.

  2. Acoustic impedances of ear canals measured by impedance tube

    DEFF Research Database (Denmark)

    Ciric, Dejan; Hammershøi, Dorte

    2007-01-01

    During hearing sensitivity tests, the sound field is commonly generated by an earphone placed on a subject ear. One of the factors that can affect the sound transmission in the ear is the acoustic impedance of the ear canal. Its importance is related to the contribution of other elements involved...... in the transmission such as the earphone impedance. In order to determine the acoustic impedances of human ear canals, the standardized method for measurement of complex impedances used for the measurement of the audiometric earphone impedances is applied. It is based on the transfer function between two microphone...... locations in an impedance tube. The end of the tube representing the measurement plane is placed at the ear canal entrance. Thus, the impedance seen from the entrance inward is measured on 25 subjects. Most subjects participated in the previous measurement of the ratio between the pressures at the open...

  3. The problem of fluid-dynamics in semicircular canal

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    An analytical solution with high accuracy which holds for any values of ε for fluid-dynamics model equation in a single semicircular canal presented by Buskirk and his co-workers has been obtained.It not only includes all of the results of Buskirk et al.but also covers three possible kinds of dynamical response modes in practice.The theoretical results are in better agreement with those of experimental observations.This investigation has laid a reliable theoretical foundation for quantitatively understanding fluid-dynamics in semicircular canal,especially fluid dynamical response.The distribution of the velocity of the endolymph in semicircular canal is given.A nonstandard method of the inverse Laplace transform is presented.

  4. The problem of fluid-dynamics in semicircular canal

    Institute of Scientific and Technical Information of China (English)

    徐明瑜; 谭文长

    2000-01-01

    An analytical solution with high accuracy which holds for any values of E for fluid-dynamics model eguation in a single semicircular canal presented by Buskirk and his co-workers has been ob-tained. it not only includes ali of the results of Buskirk et al. but also covers three possible kinds of dy-namical response modes in practice. The theoretical results are in betler agreement with those of ex-perimental observations. This investigation has laid a reliable theoretical foundation for quantitatively understanding fluid-dynamics in semicircular canal, especially fluid dynamical response. The distribu-tion of the velocity of the endolymph in semicircular canal is given. A nonstandard method of the in-verse Laplace transform is presented.

  5. Temporal Bone Fracture Causing Superior Semicircular Canal Dehiscence

    Directory of Open Access Journals (Sweden)

    Kevin A. Peng

    2014-01-01

    Full Text Available Importance. Superior semicircular canal dehiscence (SCD is a third window lesion of the inner ear causing symptoms of vertigo, autophony, tinnitus, and hearing loss. A “two-hit” hypothesis has traditionally been proposed, whereby thinly developed bone overlying the superior canal is disrupted by a sudden change in intracranial pressure. Although the symptoms of SCD may be precipitated by head injury, no previous reports have described a temporal bone fracture directly causing SCD. Observations. Two patients sustained temporal bone fractures after closed head trauma, and developed unilateral otologic symptoms consistent with SCD. In each instance, computed tomography imaging revealed fractures extending through the bony roof of the superior semicircular canal. Conclusions and Relevance. Temporal bone fractures, which are largely treated nonoperatively, have not previously been reported to cause SCD. As it is a potentially treatable entity, SCD resulting from temporal bone fracture must be recognized as a possibility and diagnosed promptly if present.

  6. Tullio phenomenon in superior semicircular canal dehiscence syndrome.

    Science.gov (United States)

    Basura, Gregory J; Cronin, Scott J; Heidenreich, Katherine D

    2014-03-18

    Tullio phenomenon refers to eye movements induced by sound.(1) This unusual examination finding may be seen in superior semicircular canal dehiscence (SSCD) syndrome.(2) This disorder is due to absent bone over the superior semicircular canal (figure). Patients complain of dizziness triggered by loud sound, aural fullness, autophony, and pulsatile tinnitus. When Tullio phenomenon exists in SSCD syndrome, the patient develops a mixed vertical-torsional nystagmus in which the slow phase rotates up and away from the affected ear (video on the Neurology® Web site at Neurology.org). This pattern of nystagmus aligns in the plane of the dehiscent semicircular canal and is due to excitation of its afferent nerves.

  7. RADIOLOGICAL STUDY OF HUMAN LUMBAR VERTEBRAL CANAL IN VIDHARBHA REGION

    Directory of Open Access Journals (Sweden)

    Shruti

    2015-06-01

    Full Text Available Increase in number of patients suffering from backache all over world needs changing health polices and cost benefit analysis, it is important to look at diseases causing low back pain and for this study of radiological structure of lumbar vertebral canal is undertaken. AIMS : To reveal the radiological feature of Human lumbar vert ebral canal. METHOD AND MATERIAL : 50 - xray of lumbar canal was collected from orthopedic department of government medical college, Nagpur. STATISTICAL ANALYSIS : Data is presented in mean ± standard deviation and categorical variable are presented in percen tage. Comparison with previous study is done. RESULT : M aximum measurement as greater in male than female of same age group. CONCLUSION : T he present study and previous studies are compared and the non - significant result is found.

  8. Comparative morphology of stingray lateral line canal and electrosensory systems.

    Science.gov (United States)

    Jordan, Laura K

    2008-11-01

    Elasmobranchs (sharks, skates, and rays) possess a variety of sensory systems including the mechanosensory lateral line and electrosensory systems, which are particularly complex with high levels of interspecific variation in batoids (skates and rays). Rays have dorsoventrally compressed, laterally expanded bodies that prevent them from seeing their mouths and more often than not, their prey. This study uses quantitative image analysis techniques to identify, quantify, and compare structural differences that may have functional consequences in the detection capabilities of three Eastern Pacific stingray species. The benthic round stingray, Urobatis halleri, pelagic stingray, Pteroplatytrygon (Dasyatis) violacea, and benthopelagic bat ray, Myliobatis californica, show significant differences in sensory morphology. Ventral lateral line canals correlate with feeding ecology and differ primarily in the proportion of pored and nonpored canals and the degree of branching complexity. Urobatis halleri shows a high proportion of nonpored canals, while P. violacea has an intermediate proportion of pored and nonpored canals with almost no secondary branching of pored canals. In contrast, M. californica has extensive and highly branched pored ventral lateral line canals that extended laterally toward the wing tips on the anterior edge of the pectoral fins. Electrosensory morphology correlates with feeding habitat and prey mobility; benthic feeders U. halleri and M. californica, have greater electrosensory pore numbers and densities than P. violacea. The percentage of the wing surface covered by these sensory systems appears to be inversely related to swimming style. These methods can be applied to a broader range of species to enable further discussion of the relationship of phylogeny, ecology, and morphology, while the results provide testable predictions of detection capabilities.

  9. Problems of drinking water treatment along Ismailia Canal Province, Egypt.

    Science.gov (United States)

    Geriesh, Mohamed H; Balke, Klaus-Dieter; El-Rayes, Ahmed E

    2008-03-01

    The present drinking water purification system in Egypt uses surface water as a raw water supply without a preliminary filtration process. On the other hand, chlorine gas is added as a disinfectant agent in two steps, pre- and post-chlorination. Due to these reasons most of water treatment plants suffer low filtering effectiveness and produce the trihalomethane (THM) species as a chlorination by-product. The Ismailia Canal represents the most distal downstream of the main Nile River. Thus its water contains all the proceeded pollutants discharged into the Nile. In addition, the downstream reaches of the canal act as an agricultural drain during the closing period of the High Dam gates in January and February every year. Moreover, the wide industrial zone along the upstream course of the canal enriches the canal water with high concentrations of heavy metals. The obtained results indicate that the canal gains up to 24.06x10(6) m3 of water from the surrounding shallow aquifer during the closing period of the High Dam gates, while during the rest of the year, the canal acts as an influent stream losing about 99.6x10(6) m3 of its water budget. The reduction of total organic carbon (TOC) and suspended particulate matters (SPMs) should be one of the central goals of any treatment plan to avoid the disinfectants by-products. The combination of sedimentation basins, gravel pre-filtration and slow sand filtration, and underground passage with microbiological oxidation-reduction and adsorption criteria showed good removal of parasites and bacteria and complete elimination of TOC, SPM and heavy metals. Moreover, it reduces the use of disinfectants chemicals and lowers the treatment costs. However, this purification system under the arid climate prevailing in Egypt should be tested and modified prior to application.

  10. Evolution of root canal sealers: An insight story

    Directory of Open Access Journals (Sweden)

    Sanjeev Tyagi

    2013-01-01

    Full Text Available Attainment of ideal root canal treatment comprises various essential factors such as proper instrumentation, biomechanical preparation, obturation, and ultimately depending upon the case, post-endodontic restoration. Main objective of the treatment is to get absolute rid of microbial entity and prevent any future predilection of re-infection. In order to achieve that, proper seal is required to cut down any chance of proliferation of bacteria and future occurrence of any pathology. Although gutta-percha has been the standard obturating material used in root canal treatment, it does not reinforce endodontically treated roots owing to its inability to achieve an impervious seal along the dentinal walls of the root canal. Gutta-percha does not from a monoblock even with the use of a resin-based sealer such as AH Plus because the sealer does not bind to gutta-percha. As a result, a monoblock is formed (consisting of Resilon core material, Resin sealer, bonding agent/primer, and dentin. Another reason of Resilon being a better obturating material could be that the removal of smear layer by ethylenediaminetetraacetic acid (EDTA after biomechanical preparation may have allowed the root canal filling material and root canal sealers to contact the canal wall and penetrate in the dentinal tubules, which may increase the strength of roots. New silicone-based sealers like Roekoseal automix and the most recent GuttaFlow have some affirmative results regarding solubility and biocompatibility, as compared to other sealers. Methacrylate resin-based sealers and mineral trioxide aggregate (MTA-based sealers have opened a new horizon for sealers.

  11. Mineral trioxide aggregate root canal filling of traumatized immature tooth

    OpenAIRE

    Maha A Kanfar; Al-Nazhan, Saad A.

    2013-01-01

    An 8-year-old female patient reported to the dental clinic seeking a help to save her traumatized maxillary left central incisor. The tooth had been treated with a temporary filling by a general dentist. The coronal tooth structure was intact, discolored, and a temporary filling was placed on the access opening. She gave a history of trauma about 3 years back. An intraoral periapical radiograph revealed an open apex and dentin bridge in the middle of the root canal. The root canal and the acc...

  12. Atypical situations in root canals anatomy of human mandibular premolars

    OpenAIRE

    Fabrício SCAINI; Fabio Leal BRAGA; Irdival Cristino FIGUEIREDO JÚNIOR; Rafael Brandão FERREIRA; Baratto Filho,Flares; de SOUSA NETO, Manoel Damião

    2005-01-01

    The knowledge of the teeth internal anatomy that will receive endodontic treatment is very important for the success of the treatment and prognosis of those teeth. In this study, the morphological variations that may occur in relation to the number of root canals present in the premolar mandibular teeth group were discussed, as well as the most efficient methods to diagnose the existence of these variations, in order to have a clearer diagnosis of the number of root canals to be treated.A cas...

  13. Aplicaciones de software para gestión de canales

    OpenAIRE

    Mallol Casals, Pilar

    2014-01-01

    Comunicació presentada al Congress on Industrial and Agricultural Canals. Lleida, 2014 Los sistemas de información geográfica permiten diseñar y poner a punto herramientas muy útiles para la gestión, puesto que registran y procesan datos gráficos y alfanuméricos del conjunto formado por canal y sus aprovechamientos. Las aplicaciones que se han presentado son ejemplos de los posibles desarrollos, con series históricas de datos y/o con de datos actuales, simular escenarios probables para ...

  14. Bilateral bifid mandibular canal: Report of two cases

    Directory of Open Access Journals (Sweden)

    Karamifar Kasra

    2009-01-01

    Full Text Available Bifid mandibular canal is a rare anatomical variation that can be of considerable interest to a dentist. This condition can lead to complications when performing mandibular anesthesia or during surgery of the lower third molar, orthognatic or reconstructive mandibular surgery, or placement of dental implants and prosthesis; bleeding and traumatic neuroma are possible complications. Therefore, awareness of this condition is important. We report two cases of bilateral bifid mandibular canal: one in a 22-year-old male and the other in a 24-year-old female.

  15. [Electronic determination of the length of the root canal].

    Science.gov (United States)

    Dehon, P; Van Nieuwenhuysen, J P

    1999-01-01

    The endpoint of an endodontic treatment must be situated at the cemen-to-dentinal junction to preserve the biological potential of the periapical area and to realize a complete disinfection of the principal root canal system. Thus, the determination of working length is a crucial factor in endodontic therapy. The conventional radiographic method cannot provide the accurate location of the apical constriction. For this reason, the electronic apex locators have been developed. Now, the last generation of apex locators has become more sophisticated and the electronic measurements seem to be accurate and reliable with electrolytic solutions in the canal.

  16. Evaluation of pre-fabricated root canal posts.

    Science.gov (United States)

    Hew, Y S; Purton, D G; Love, R M

    2001-03-01

    In this in vitro study, properties of a titanium alloy post recently introduced to the market (IntegraPost), were compared with those of a clinically proven stainless steel post (ParaPost). The IntegraPost has a unique, perforated, spherical head and a microknurled shank surface. The posts were tested for rigidity, for retention within the root canals of extracted teeth and for ability to retain composite resin cores. The two post types exhibited similar properties in core and root canal retention, however, the IntegraPost was significantly less rigid than the ParaPost.

  17. Morphological description of mandibular canal in panoramic radiographs

    OpenAIRE

    Maise Mendonça Amorim

    2006-01-01

    Resumo: O conhecimento da morfologia e topografia do canal mandibular é importante para as intervenções odontológicas realizadas na mandíbula, pois implica na preservação das estruturas nobres que o atravessam. O objetivo deste trabalho foi analisar morfológica e morfometricamente o trajeto e as relações do canal mandibular em indivíduos de ambos os gêneros, pertencentes a duas faixas etárias distintas, ambas na fase adulta. A amostra foi composta por 300 radiografias panorâmicas, divididas e...

  18. Variables que influyen en la fractura de instrumentos rotatorios de níquel titanio en conductos radiculares instrumentados por operadores inexpertos

    OpenAIRE

    Morelló Castro, Sergio

    2014-01-01

    Uno de los factores básicos para el éxito en un tratamiento de conductos radiculares es la conformación. En los últimos 10 años, la endodoncia ha sufrido una auténtica revolución en cuanto a la aparición de nuevos instrumentos, nuevos diseños, nuevas aleaciones y nuevas técnicas de utilización que han modificado considerablemente esa conformación del sistema de conductos. El objetivo principal de la conformación de los mismos es conseguir la configuración ideal con la mínima remoción...

  19. Diagnóstico de reabsorción radicular externa en ortodoncia. Una revisión sistemática.

    OpenAIRE

    Márquez, José Fernando; Castaño, Jorge Mario; Rueda,Zulma Vanessa; Rendón, Jaime

    2014-01-01

    Introducción: esta revisión sistemática evaluó los métodos radiográficos que permiten detectar la reabsorción radicular externa (rre) en  ortodoncia, determinar el tiempo indicado para la toma de radiografías de control e identificar las características radiográficas de la rre.  Materiales y métodos: se realizaron búsquedas sistemáticas en bases de datos electrónicas y búsquedas manuales, sin restricciones de  año, en español e ingles. Se seleccionaron cohortes y ensayos clínicos aleatorios e...

  20. AFSC/ABL: Lynn Canal Overwinter Acoustic Survey, 2004-2005

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The acoustic trawl database for Lynn Canals echo-trawl survey was conducted from 2001 to 2004 throughout southern Lynn Canal in southeast Alaska. Acoustic surveys...

  1. A Clinical Update on the Different Methods to Decrease the Occurrence of Missed Root Canals

    Science.gov (United States)

    Mohammadi, Zahed; Asgary, Saeed; Shalavi, Sousan; V. Abbott, Paul

    2016-01-01

    One of the main causes of endodontic treatment failure is the clinician’s inability to localize all the root canals. Due to the complex anatomy of the root canal system, missed canals are not uncommon. There are several strategies to decrease the possibility of missed root canals starting with good pre-operative radiographies. In order to overcome the limitations of conventional radiographies, cone-beam computed tomography (CBCT) can be considered. A correct access cavity preparation is of pivotal importance in localizing the orifices of the root canals. Furthermore, ultrasonics are very important devices to find missed canals. Increasing magnification and illumination enhance the possibility of finding all root canals during root canal treatment. The purpose of the present paper was to review all of the above techniques and devices. PMID:27471533

  2. A Guyon's canal ganglion presenting as occupational overuse syndrome: A case report.

    LENUS (Irish Health Repository)

    Chan, Jeffrey C Y

    2008-01-01

    Occupational overuse syndrome (OOS) can present as Guyon\\'s canal syndrome in computer keyboard users. We report a case of Guyon\\'s canal syndrome caused by a ganglion in a computer user that was misdiagnosed as OOS.

  3. Evaluation of Mandibular Anterior Nutrient Canals in Periodontal Diseases: A Prospective Case Control Radiographic Study

    Directory of Open Access Journals (Sweden)

    Govind Singh

    2011-01-01

    Conclusions: The prevalence of nutrient canals was higher in patients with periodontitis. As age advanced, prevalence was more. Increased frequency of nutrient canals of 3 or more than 3 was seen with increased seventy of bone loss.

  4. Development of the lateral line canal system through a bone remodeling process in zebrafish.

    Science.gov (United States)

    Wada, Hironori; Iwasaki, Miki; Kawakami, Koichi

    2014-08-01

    The lateral line system of teleost fish is composed of mechanosensory receptors (neuromasts), comprising superficial receptors and others embedded in canals running under the skin. Canal diameter and size of the canal neuromasts are correlated with increasing body size, thus providing a very simple system to investigate mechanisms underlying the coordination between organ growth and body size. Here, we examine the development of the trunk lateral line canal system in zebrafish. We demonstrated that trunk canals originate from scales through a bone remodeling process, which we suggest is essential for the normal growth of canals and canal neuromasts. Moreover, we found that lateral line cells are required for the formation of canals, suggesting the existence of mutual interactions between the sensory system and surrounding connective tissues.

  5. Morphology of the mandibular canal and the angulation between the mandibular and mental canals in dry skulls

    DEFF Research Database (Denmark)

    Pálsson, S R; Kjaer, I

    2008-01-01

    The aim of this study was to analyse the correlation between external and internal mandibular morphology in adult or adolescent normal anthropological mandibles. Lateral radiographs of 31 symmetrical mandibles were analysed. The external morphology was defined by the gonial and beta......-angles. In order to analyse internal morphology, a metallic pin was placed in the mental canal on the left side before radiography. The angle between the mental and the mandibular canals was termed the 'mental angle' and that expressing the curvature of the mandibular canal, the 'mandibular angle'. Spearman...... correlation analysis was used to investigate the relationships between the angles. Internal morphology: a statistically significant correlation was found between the mental and mandibular angles (correlation coefficient: -0.60, P=0.0004). When the mental angle was narrow, the mandibular angle tended...

  6. Effect of surface treatments on the flexural properties and adhesion of glass fiber-reinforced composite post to self-adhesive luting agent and radicular dentin.

    Science.gov (United States)

    Elnaghy, Amr M; Elsaka, Shaymaa E

    2016-01-01

    This study evaluated the effect of different surface treatments on the flexural properties and adhesion of glass fiber post to self-adhesive luting agent and radicular dentin. Seventy-five single-rooted human teeth were prepared to receive a glass fiber post (Reblida). The posts were divided into five groups according to the surface treatment: Gr C (control; no treatment), Gr S (silanization for 60 s), Gr AP (airborne-particle abrasion), Gr HF (etching with 9 % hydrofluoric acid for 1 min), and Gr M10 (etching with CH2Cl2 for 10 min). Dual-cure self-adhesive luting agent (Rely X Unicem) was applied to each group for testing the adhesion using micropush-out test. Failure types were examined with stereomicroscope and surface morphology of the posts was characterized using a scanning electron microscopy (SEM). Flexural properties of posts were assessed using a three-point bending test. Data were analyzed using ANOVA and Tukey's HSD test. Statistical significance was set at the 0.05 probability level. Groups treated with M10 showed significantly higher bond strength than those obtained with other surface treatments (P C > S > AP > HF. Most failure modes were adhesive type of failures between dentin and luting agent (48.2%). SEM analysis revealed that the fiber post surfaces were modified after surface treatments. The surface treatments did not compromise the flexural properties of fiber posts. Application of M10 to the fiber post surfaces enhanced the adhesion to self-adhesive luting agent and radicular dentin.

  7. A comparative evaluation of the increase in root canal surface area and canal transportation in curved root canals by three rotary systems: A cone-beam computed tomographic study

    Science.gov (United States)

    Prasanthi, Nalam NVD; Rambabu, Tanikonda; Sajjan, Girija S; Varma, K Madhu; Satish, R Kalyan; Padmaja, M

    2016-01-01

    Aim: The aim of this study was to measure the increase in root canal surface area and canal transportation after biomechanical preparation at 1, 3, and 5 mm short of the apex with three different rotary systems in both continuous rotary and reciprocating rotary motions. Materials and Methods: Sixty freshly extracted human mandibular molars with mesial root canal curvatures between 20° and 30° were included in the study. Teeth were randomly distributed into three groups (n = 20). Biomechanical preparations were done in all the mesial canals. In Group 1, instrumentation was done with ProTaper universal rotary files, Group 2, with K3XF rotary files, and Group 3, with LSX rotary files. Each group was further subdivided into subgroups A and B (n = 10) where instrumentation was done by continuous rotary and reciprocating rotary techniques, respectively. Increase in root canal surface area and canal transportation was measured using the preoperative and postoperative cone-beam computed tomography scans. Statistical Analysis: The data were analyzed by one-way ANOVA followed by Tukey pairwise multiple comparison tests. Results: Increase in root canal surface area was significantly more (P ProTaper and K3XF groups when compared to LSX group. Canal transportation was significantly more (P ProTaper group when compared to K3XF and LSX groups. There was no significant difference (P > 0.05) in increase of root canal surface area and canal transportation between continuous rotary and reciprocating rotary techniques for ProTaper Universal, K3XF and LSX groups. Conclusion: LSX rotary system showed minimal increase of root canal surface area and minimal canal transportation when compared to ProTaper and K3XF rotary systems. PMID:27656062

  8. INFLUÊNCIA DA DENSIDADE DE INÓCULO DE Fusarium solani f.sp. phaseoli NA SEVERIDADE DA PODRIDÃO RADICULAR SECA DO FEIJOEIRO EFFECT OF Fusarium solani f.sp. phaseoli INOCULUM DENSITY ON DRY ROOT ROT SEVERITY IN THE COMMON BEAN

    Directory of Open Access Journals (Sweden)

    Gesimária Ribeiro Costa

    2007-09-01

    Full Text Available

    Foram testadas quatro densidades de inóculo de Fusarium solani, em gramas por litro de solo (1,0; 2,0; 4,0 e 8,0 e um tratamento testemunha, em solo tipo Latossolo Vermelho-Escuro, cultivado e não cultivado, com o objetivo de determinar a densidade mínima de inóculo no solo necessária para a ocorrência de podridão radicular seca do feijoeiro. Como variáveis respostas foram avaliadas: número de microorganismos totais do solo, número de propágulos de F. solani, atividade microbiológica total do solo e severidade da doença em plântulas. Os resultados indicaram que a densidade de inóculo do fungo variou com o tipo de solo. Para um solo não cultivado a densidade necessária para causar a doença esteve acima de 5.127 propágulos por grama de solo, enquanto para o solo cultivado a densidade de inóculo para causar doença foi de 3.701 propágulos por grama de solo. Os índices de doença em plântulas cultivadas sob o solo cultivado foram duas vezes superiores ao índice de doença de plântulas sob o solo não cultivado. A atividade microbiológica total nos solos, determinada pela desidrogenase de fluorescina diacetato, não se correlacionou com a população dos microorganismos, indicando que a simples presença desses não implica em que estejam ativos.

    PALAVRAS-CHAVE: Solo supressivo; solo conducivo; Phaseolus vulgaris.

    Four densities of Fusarium solani inoculum (1, 2, 4 and 8 g/L of soil were tested for determining the minimum inoculum density for the occurrence of bean dry root rot, in two soil types. The response variables evaluated were the total number of microorganisms in the soil, the number of F. solani f. sp. phaseoli propagules, total soil microbial activity and seedling disease severity

  9. Treatment of Two Canals in All Mandibular Incisor Teeth in the Same Patient

    Directory of Open Access Journals (Sweden)

    Vandana B. Kokane

    2014-01-01

    Full Text Available The main reason for unfavourable outcome in endodontic treatment of mandibular incisor is the inability to detect the presence of second canal. Pain even after extirpation of complete pulp tissue from root canal of vital teeth is the main indication of hidden canals. The present case report is also on pain because of another neglected canal in all mandibular incisors in the same patient.

  10. Independent and Confluent Middle Mesial Root Canals in Mandibular First Molars: A Report of Four Cases

    Directory of Open Access Journals (Sweden)

    Mohanavelu Deepalakshmi

    2012-01-01

    Full Text Available Mandibular molars demonstrate considerable variations with respect to number of roots and root canals. The possibility of additional root canals should be considered even in teeth with a low frequency of abnormal root canal anatomy. This paper discusses the endodontic management of the rare anatomical complexity middle mesial canals in mandibular first molar and also serves to remind the clinicians that such anatomical variations should be taken into account during the endodontic treatment of the mandibular molars.

  11. Maxillary first molars with six canals confirmed with the aid of cone-beam computed tomography

    Directory of Open Access Journals (Sweden)

    Tahra Mohammad Al-Habboubi

    2016-01-01

    Full Text Available The maxillary first molar exhibits unpredictable root canal morphology. Different number of root canals has been reported with the aids of new tools. It is very important to clinically detect all canals for better outcome results. The purpose of the present case is to present a case of the maxillary first molar in a Saudi male patient with an anatomical variation of having six root canals that were confirmed with cone-beam computed tomography.

  12. Four cuspal maxillary second premolar with single root and three root canals: Case report

    Directory of Open Access Journals (Sweden)

    Parul Bansal

    2016-01-01

    Full Text Available Traditional configuration of maxillary second premolars has been described to have two cusps, one root and one or two root canals. The endodontic literature reports considerable anatomic aberrations in the root canal morphology of maxillary second premolar but the literature available on the variation in cuspal anatomy and its relationship to the root canal anatomy is sparse. The purpose of this clinical report was to describe the root and root canal configuration of a maxillary second premolar with four cusps.

  13. Case report: endodontic and surgical treatment of an upper central incisor with external root resorption and radicular cyst following a traumatic tooth avulsion.

    Science.gov (United States)

    Lux, Hans-Christian; Goetz, Falko; Hellwig, Elmar

    2010-11-01

    In the age group between 6 and 12 years, trauma to the upper incisors happens frequently. In the case of avulsion, a replantation is the state-of-the-art treatment; however, it may lead to several complications, particularly if suitable posttraumatic management is not carried out. External cervical resorptions as well as apical granuloma and cysts due to microbial contamination of the root canal are common complications. In the presented trauma case, a conservative approach was chosen to treat a large cystic lesion combined with cervical and apical resorptions. After initial placement of Ledermix and calcium hydroxide into the root canal, a marsupialization with the temporary insertion of an obturator was performed. The gradual reduction led to a fast recovery of the bony defect and a root canal filling was placed. The 2-year follow-up showed an improved condition. All adjacent teeth remained vital during the course of the treatment.

  14. Evaluación in vitro de la preparación de conductos mesiales de molares con instrumentos manuales Ni-Ti y Protaper Universal rotatorio In vitro evaluation of mesial molars canals preparation with manual Ni-Ti instruments and rotatory Protaper Universal

    Directory of Open Access Journals (Sweden)

    D. Aracena Rojas

    2013-04-01

    Full Text Available Con la finalidad de disminuir los errores durante la preparación de los conductos radiculares, se han introducido diversas modificaciones en los sistemas de instrumentación mecanizados de níquel-titanio. Se realizó un estudio in vitro para comparar el grado de transporte que se presenta a nivel de la unión del tercio apical con el tercio medio de conductos radiculares con el sistema rotatorio Protaper Universal y el sistema manual de níquel-titanio, con la técnica de fuerzas balanceadas. Se trabajó con 52 conductos mesiales de 26 molares maxilares y mandibulares, las cuales fueron divididas en dos grupos. El primer grupo de conductos (n = 28 fueron instrumentados con Protaper Universal rotatorio y el segundo grupo de conductos (n = 24 fueron instrumentados con técnica manual de fuerzas balanceadas. Las raíces mesiales de los molares fueron sumergidas en una matriz de acrílico, la cual permitió manipular las preparaciones, realizar cortes transversales y comparar los conductos radiculares antes y después de la instrumentación, para establecer las diferencias que se apreciaron en cuanto al transporte apical. Las imágenes obtenidas fueron fotografiadas con un microscopio estereoscópico y analizadas mediante el programa Autodesk AutoCAD® 2007. Finalmente, los datos obtenidos fueron tabulados y analizados con el programa Stata® 9.0 v. En el presente trabajo Protaper provocó menos transporte apical comparado con la técnica manual de fuerzas balanceadas.In order to reduce errors during root canal preparation, there have been several changes in instrumentation with rotatory systems of nickel-titanium. This is an in vitro study and the aim was to compare the degree of transportation that occurs at the union between the apical third and half third of root canals with the rotaroty Protaper Universal and nickel titanium manual system with balanced force technique. We worked with 52 mesial canals of 26 first and second maxillary and

  15. How the cross-sectional discontinuity between ear canal and probe affects the ear canal length estimation.

    Science.gov (United States)

    Zebian, Makram; Hensel, Johannes; Fedtke, Thomas

    2012-07-01

    Many ear canal probes both deliver and measure sound via narrow tubes. This study investigates the effect of the cross-sectional discontinuity at the interface between ear canal models and the connecting tubes of a commercially available otoacoustic emission probe on the "acoustically" estimated cavity lengths. Rigid cavities having the same length but different diameters were produced, and modeled by the finite element method. Cavities with a diameter larger than 8 mm had acoustic lengths that considerably overestimated the real geometry. A length correction was derived, which, in most applications, compensates for the measurement errors emerging from the discontinuity effects.

  16. 33 CFR 165.1328 - Regulated Navigation Area; U.S. Navy submarines, Hood Canal, WA.

    Science.gov (United States)

    2010-07-01

    .... Navy submarines, Hood Canal, WA. 165.1328 Section 165.1328 Navigation and Navigable Waters COAST GUARD... § 165.1328 Regulated Navigation Area; U.S. Navy submarines, Hood Canal, WA. (a) Location. The following... whenever any U.S. Navy submarine is operating in the Hood Canal and is being escorted by the Coast...

  17. The relation between parameter curves and lines of curvature on canal surfaces

    CERN Document Server

    Dogan, Fatih

    2012-01-01

    A canal surface is the envelope of a moving sphere with varying radius, defined by the trajectory C(t) (spine curve) of its center and a radius function r(t). In this paper, we investigate when parameter curves of the canal surface are also lines of curvature. Last of all, for special spine curves we obtain the radius function of canal surfaces.

  18. 77 FR 57019 - Drawbridge Operation Regulation; Lake Washington Ship Canal, Seattle, WA

    Science.gov (United States)

    2012-09-17

    ... SECURITY Coast Guard 33 CFR Part 117 Drawbridge Operation Regulation; Lake Washington Ship Canal, Seattle... Northern Santa Fe Railway Bridge across the Lake Washington Ship Canal, mile 0.1, at Seattle, WA. This... Canal, mile 0.1 (Ballard-Salmon Bay), be locked in the closed position and not be required to open...

  19. 33 CFR 162.175 - Black Rock Canal and Lock at Buffalo, New York.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Black Rock Canal and Lock at Buffalo, New York. 162.175 Section 162.175 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Black Rock Canal and Lock at Buffalo, New York. In the Black Rock Canal and Lock, no vessel may exceed...

  20. Segmentation of the mandibular canal in cone-beam CT data

    NARCIS (Netherlands)

    Kroon, Dirk-Jan

    2011-01-01

    Accurate information about the location of the mandibular canal is essential in case of dental implant surgery. The goal of our research is to find an automatic method which can segment the mandibular canal in Cone-beam CT (CBCT). Mandibular canal segmentation methods in literature using a priori

  1. Role of the confinement of a root canal on jet impingement during endodontic irrigation

    NARCIS (Netherlands)

    Verhaagen, B.; Boutsioukis, C.; Heijnen, G. L.; van der Sluis, L. W. M.; Versluis, M.

    2012-01-01

    During a root canal treatment the root canal is irrigated with an antimicrobial fluid, commonly performed with a needle and a syringe. Irrigation of a root canal with two different types of needles can be modeled as an impinging axisymmetric or non-axisymmetric jet. These jets are investigated exper

  2. Endodontic Treatment of a Mandibular Second Premolar with Three Roots and Three Canals

    Directory of Open Access Journals (Sweden)

    Bonny Paul

    2014-01-01

    Full Text Available Complex root canal system with atypical variations is a common finding among mandibular premolars. Endodontic treatment in these teeth may not be successful due to the failure to recognise and treat multiple canals. This paper presents endodontic treatment of a mandibular second premolar with three roots and three canals.

  3. Comparison of 2 flushing methods used during passive ultrasonic irrigation of the root canal

    NARCIS (Netherlands)

    van der Sluis, Lucas; Wu, Min-Kai; Wesselink, Paul

    2009-01-01

    Objective: To determine the effect of irrigation time on the removal of dentin debris from root canals irrigated with passive ultrasonic irrigation comparing 2 flushing methods. Method and Materials: Root canals with a standardized groove in 1 canal wall, which was filled with dentin debris, were ir

  4. IMPACT OF CANAL DESIGN LIMITATIONS ON WATER DELIVERY OPERATIONS AND AUTOMATION

    Science.gov (United States)

    Irrigation canals are often designed for water transmission. The design engineer simply ensures that the canal will pass the maximum design discharge. However, irrigation canals frequently operated far below design capacity. Because demands and the distribution of flow at bifurcations (branch points...

  5. Spatial and seasonal variations of the contamination within water body of the Grand Canal, China

    NARCIS (Netherlands)

    Wang, X.L.; Han, Jingyi; Xu, L.G.; Zhang, Q.

    2010-01-01

    To delineate the character of contaminations in the Grand Canal, China, a three-year study (2004-2006) was conducted to investigate variations the water quality in the canal. Results showed that the variation of water quality within the Grand Canal was of there is remarkable spatial and seasonal het

  6. 33 CFR 207.440 - St. Marys Falls Canal and Locks, Mich.; use, administration, and navigation.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false St. Marys Falls Canal and Locks.... Marys Falls Canal and Locks, Mich.; use, administration, and navigation. (a) The use, administration... by radiotelephone to the Corps of Engineers Chief Lockmaster at St. Marys Falls Canal dispatch...

  7. Bilateral Mandibular Condylar Fractures with Associated External Auditory Canal Fractures and Otorrhagia

    OpenAIRE

    Dang, David

    2016-01-01

    A rare case of bilateral mandibular condylar fractures associated with bilateral external auditory canal fractures and otorrhagia is reported. The more severe external auditory canal fracture was present on the side of high condylar fracture, and the less severe external auditory canal fracture was ipsilateral to the condylar neck fracture. A mechanism of injury is proposed to account for such findings.

  8. Bilateral Mandibular Condylar Fractures with Associated External Auditory Canal Fractures and Otorrhagia.

    Science.gov (United States)

    Dang, David

    2007-01-01

    A rare case of bilateral mandibular condylar fractures associated with bilateral external auditory canal fractures and otorrhagia is reported. The more severe external auditory canal fracture was present on the side of high condylar fracture, and the less severe external auditory canal fracture was ipsilateral to the condylar neck fracture. A mechanism of injury is proposed to account for such findings.

  9. File list: Unc.Oth.10.AllAg.Schlemms_canal_cells [Chip-atlas[Archive

    Lifescience Database Archive (English)

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