Análise em canais curvos do desvio apical provocado por limas de aço inoxidável e de níquel–titânio manuais e acopladas em sistema de rotação alternada

O propósito deste estudo foi analisar in vitro o desvio apical produzido por limas de aço inoxidável (Flexofile) pré curvadas e limas de níquel-titânio (Nitiflex), manualmente e em rotação alternada, com contra-ângulo TEP-10-R (NSK), na instrumentação do canal radicular. Foram utilizadas oitenta raízes mesiais curvas de molares inferiores extraídos, as quais foram selecionadas e distribuídas em quatro grupos homogêneos de vinte elementos cada. Foi realizada a cirurgia de acesso, preparo da entrada do canal e odontometria. Em seguida, os dentes foram incluídos em resina transparente, em fôrma hexagonal. Para padronização das tomadas radiográficas, foi utilizada a plataforma radiográfica com uma modificação que permitiu a obtenção de radiografias iniciais e finais idênticas em três diferentes incidências, ou seja, sentidos V/L, M-V / D-L e D-V / M-L. Após a radiografia inicial em todos os três sentidos com uma lima #15 no interior dos condutos, procedeu-se o preparo do canal. As raízes do Grupo 1 foram instrumentadas com técnica manual coroa-ápice e limas Flexofile; O Grupo 2 foi instrumentado com limas Flexofile em técnica mecâno-oscilatória (TEP- 10 R- NSK); O Grupo 3 foi instrumentado manualmente, em técnica coroa-ápice, com limas Nitiflex e o Grupo 4 foi preparado com limas Nitiflex em técnica mecâno-oscilatória (TEP- 10 R- NSK). Finda esta fase, foi realizada uma nova radiografia com uma lima #40 no interior do canal, nos mesmos padrões da primeira. As imagens foram digitalizadas, a análise dos desvios se deu pela sobreposição das imagens e a mensuração através do software Image Tool. Os resultados mostraram que a utilização de três incidências em diferentes sentidos no mesmo espécime radicular é importante para detectar, com segurança, algum grau angular de desvio apical após o preparo do canal. Constatou-se que em 67,5% das raízes houve algum grau angular de desvio independente da técnica e, apesar de não-significantes estatisticamente, a ocorrência dos desvios ocorreram, em ordem decrescente, com a técnica mecâno-oscilatória com limas Flexofile (G2), técnica manual com limas Nitiflex (G3), técnica mecâno-oscilatória com limas Nitiflex (G4) e técnica manual com limas Flexofile (G1).

Controle biológico da podridão radicular (Pythium aphanidermatum) em cultivos hidropônicos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeitos do tipo de sistema adesivo e região do dente sobre a resistência adesiva à dentina

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência da agulha irrigadora e da dilatação do canal radicular na eficácia da irrigação endodôntica

Introduction: The irrigation of root canals aims to their cleaning and disinfection, improving endodontic treatment success. Objective: To investigate the influence of the diameter and type of irrigation needle and the root canal enlargement on the mechanical efficacy of endodontic irrigation. Material and methods: Twelve human single-rooted mandibular incisors were used. During some instrumentation stages (enlargement by #20, #30, and #40 K file), root canals were filled with radiographic contrast solution mixed to propyleneglycol and zinc oxide. Needles with different diameters and designs were employed: G1 – 23G and lateral opening; G2 – 22G and apical opening; G3 – 30G and lateral opening; G4 – 30G and apical opening. The needles were inserted up to resistance, with 1 mm step-back to avoid root canal obliteration. The irrigation was performed with 2 mL of distilled water. Before and after irrigation/aspiration, teeth were radiographed at bucco-lingual and mesiodistal direction, using a digital radiographic system. Then, root canal areas, before (filled by contrast solution) and after irrigation (remnant of contrast solution), were submitted to image subtraction with Adobe Photoshop CS4 software. Subsequently, the areas were measured by Image Tool 3.0 software, allowing the obtaining of the cleaning percentage for each modality. Data were analysed by using Anova and Tukey’s test. The level of significance was set at P < 0.05. Results: For all root canal enlargements, 30G needles (G3 e G4) presented a better cleaning efficacy. In all groups, higher cleaning efficacy percentage was observed at #30 and #40 K file enlargement. Conclusion: Regardless their design, thinner needles were more effective; a better cleaning efficacy occurred in more enlarged root canals.

Evaluación comparativa in vitro de la capacidad de sellado del sistema de conductos radiculares por diferentes técnicas

The aim of this study was to evaluate in vitro the sealing ability of the root canal using different techniques: cold lateral compaction, modified Hybrid Tagger, Thermafil and System B. Material and methods. Were used 116 human single-roots, included in resin blocks, sectioned longitudinally, attached to a device with screws and divided into four groups (n=29). After instrumentation using a bur, depression was made in each third of the root canal in each of the halves. Teeth were filled upon the different techniques. For evaluation of the quality, pictures were taken with a 1.5X magnification, photos and radiographs were utilized. After statistical analysis, were performed both macroscopic and radiographic evaluation, by Chi-square test (χ2). Results. The Thermafil technique showed better results in terms of sealing capacity, failures and homogeneity followed by modified Hybrid Tagger, the System B and cold lateral compaction. Conclusions. Thermafil was the technique that shown to be macroscopic, radiographic and homogeneously best over the other techniques evaluated in regard to the filling of the depressions made (AU)

Cirugía endodóntica con obturación simultánea del conducto radicular: caso atípico

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 disadvantages, such as distortion and superimposition with other anatomical structures. The aim of this clinical case report is to show the limitations of radiographic examination in an apical surgery in which a root perforation was not visible in the radiographic image, as well as the gutta-percha was not related to its real clinical location.

Influência do diâmetro foraminal do canal radicular, do tipo e da penetração de agulha, e do fluxo da solução irrigadora na limpeza e na extrusão apical

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Sistema adesivo universal: influência da técnica de condicionamento e da pressão pulpar com soro fetal bovino ou água deionizada na resistência de união à dentina humana

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estética em sistema metal free associado a núcleos metalocerâmicos personalisados

The evolution of ceramic systems currently allows the manufacture of prosthesis similar to the natural teeth, meeting the expectations of patients. However, when using vitreous ceramic the color of substrate is significant for the esthetic result, requiring planning aesthetic cores when involved reconstruction of endodontically treated teeth without coronal structure. Thus, the aim of this study to describe a case report of aesthetic rehabilitation in upper anterior teeths using vitreous ceramic system for the reconstruction of elements: 11, 12, 21 and 22 after endodontically treated. It was emphasized the removal of crowns and manufacture of custom cast post and core with ceramic in coronal portion, prioritizing the aesthetic result. Through the clinical results observed can be seen that the use of custom cast post and core with ceramic in association lithium disilicate glass ceramics provided a satisfactory aesthetic result.

Influência do veículo na remoção da pasta tri antibiótica do canal radicular

Pós-graduação em Ciência Odontólogica - FOA

Emissão de gases do efeito estufa e estoque de carbono no sistema solo-planta em área com aplicação superficial de calcário e gesso em experimento de longa duração

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação do Clinpro XT® na redução da permeabilidade da dentina radicular e resistência a desafios ácidos, na obliteração de túbulos dentinários e rugosidade superficial da dentina

Pós-graduação em Odontologia - FOAR

Variabilidade espacial e sazonal da concentração de elementos-traço em sedimentos do sistema estuarino de Santos-Cubatão (SP)

Multi-element analyses of sediment samples from the Santos-Cubatão Estuarine System were carried out to investigate the spatial and seasonal variability of trace-element concentrations. The study area contains a rich mangrove ecosystem that is a habitat for tens of thousands of resident and migratory birds, some of them endangered globally. Enrichments of metals in fine-grained surface sediments are, in decreasing order, Hg, Mn, La, Ca, Sr, Cd, Zn, Pb, Ba, Cu, Cr, Fe, Nb, Y, Ni and Ga, relative to pre-industrial background levels. The maximum enrichment ranged from 49 (Hg) to 3.1 (Ga). Mercury concentrations were greater in the Cubatão river than in other sites, while the other elements showed greater concentrations in the Morrão river. Concentrations of Mn were significantly greater in winter and autumn than in summer and spring. However, other elements (e.g. Cd and Pb) showed the opposite, with greater concentrations in summer and spring. This study suggests that seasonal changes in physical and chemical conditions may affect the degree of sediment enrichment and therefore make the assessment of contamination difficult. Consequently, these processes need to be considered when assessing water quality and the potential contamination of biota.

Sistema limpo em linha para extração em fase sólida de contaminantes emergentes em águas naturais

A solid-phase in-line extraction system for water samples containing low levels of emerging contaminants is described. The system was specially developed for large volume samples (up to 4 L) using commercial solid-phase extraction (SPE) cartridges. Four sets containing PTFE-made connectors, brass adapters and ball valves were used to fit SPE cartridges and sample bottles to a 4-port manifold attached to a 20 L carboy. A lab-made vacuum device was connected to the manifold cap. The apparatus is robust and less expensive than the typical available system. Its also provides less experimental handling, avoiding cross contamination and sample losses.

Análise do investimento em climatização para bovinos de leite em sistema de alojamento free-stall

The difficulty in adapting European dairy cows breeds in Brazil affect considerably the milk production sector. Brazilian climatic conditions are not totally favorable and the development of new tecnologies is needed for the animals express their genetic potential, as well as their best feed conversion. An economical analysis of the applied investment in the free-stall climatization equipment in dairy housing, for estimating studies related to profit, possibility of return investment as well as time for this return is necessary. The objective of this research was to evaluate the influence of climatization investment in the milk production process and analyze the economical aspect of this investment. There were used 470 high productive dairy cows with genetic and morphologic homogeneous characteristics, and analyzed in two similar periods. Investment calculations were done using Excell®. The results were satisfactory and the invested capital was proved to return to the producer in a short term, 57 days.