Ability of new obturation materials to improve the seal of the root canal system: A review

http://www.septodont.ca/sites/default/files/Abstract%20JOE%20Oct%202011%20Acroseal.pdf

Physical Properties and Interfacial Adaptation of Three Epoxy Resin–based Sealers

Pulp‐dentin Biology in Restorative Dentistry

Objective The aim of this study was to evaluate the influence of apical foramen widening on the healing of chronic periapical lesions in dogs' teeth after root canal filling with Sealer 26 or Endomethasone. Study design Forty root canals of dogs' teeth were used. After pulp extirpation, the canals were exposed to the oral cavity for 180 days for induction of periapical lesions, and then instrumented up to a size 55 K-file at the apical cemental barrier. In 20 roots, the cemental canal was penetrated and widened up to a size 25 K-file; in the other 20 roots, the cemental canal was preserved (no apical foramen widening). All canals received a calcium hydroxide intracanal dressing for 21 days and were filled with gutta-percha and 1 of the 2 sealers: group 1: Sealer 26/apical foramen widening; group 2: Sealer 26/no apical foramen widening; group 3: Endomethasone/apical foramen widening; group 4: Endomethasone/no apical foramen widening. The animals were killed after 180 days, and serial histologic sections from the roots were prepared for histomorphologic analysis. Scores were assigned according to preestablished histomorphologic parameters and analyzed statistically by Kruskal-Wallis and Mann-Whitney U tests. Results Regarding new cementum formation, repair of cementum and bone resorption areas, presence of microorganisms, inflammatory cell infiltrate and periodontal ligament conditions, significantly better periapical healing was obtained when foramen widening was done and Sealer 26 was used. Conclusion Apical foramen widening and calcium hydroxide–containing sealer were more favorable to the healing of chronic periapical lesions.

Influence of apical foramen widening and sealer on the healing of chronic periapical lesions induced in dogs' teeth.

In the Pacific Ocean, air and ocean temperatures, atmospheric carbon dioxide, landings of anchovies and sardines, and the productivity of coastal and open ocean ecosystems have varied over periods of about 50 years. In the mid-1970s, the Pacific changed from a cool “anchovy regime” to a warm “sardine regime.” A shift back to an anchovy regime occurred in the middle to late 1990s. These large-scale, naturally occurring variations must be taken into account when considering human-induced climate change and the management of ocean living resources.

From Anchovies to Sardines and Back—Multidecadal Change in the Pacific Ocean

A comparison study of periapical repair in dogs' teeth using RoekoSeal and AH plus root canal sealers: a histopathological evaluation.

A evolucao da tecnologia da informacao e a sua insercao na Arquivologia proporcionou rupturas no conceito e na concepcao de documento arquivistico que se refletem nas praticas de gestao, preservacao e acesso. A complexidade e a especificidade do documento arquivistico digital implica na necessidade de um tratamento diferenciado se comparado aos documentos tradicionais em suportes analogicos. Alem disto, e preciso garantir a integridade e a autenticidade dos documentos digitais armazenando-os em um sistema confiavel. Neste sentido, os repositorios digitais se configuram no âmbito global como a melhor alternativa para a preservacao em longo prazo, entretanto, as acoes para gerar confiabilidade ainda sao pouco difundidas. Este artigo tem por objetivo realizar uma reflexao sobre os requisitos para desenvolver um repositorio digital confiavel. A metodologia utilizada consiste na revisao de materiais previamente publicados nos ultimos vinte anos, a qual aborda os dados de forma qualitativa, enfatizando os estudos mais recentes. Dentre os avancos mais significativos, salienta-se a realizacao de auditorias para que os repositorios possam ser certificados como “confiaveis”. Alem disso, e reforcada a utilizacao de normas e recomendacoes, e a definicao previa de politicas de preservacao digital que considerem a confiabilidade durante todo o ciclo documental, configurando assim uma custodia confiavel.

/pdf/repositorios-digitais-confiaveis-para-documentos-43amt3pmkd.pdf

Repositórios digitais confiáveis para documentos arquivísticos: ponderações sobre a preservação em longo prazo

This study reflcts on the preservation of digital archival records from a systemic perspective, based  on standards recognized by scientifi literature. In such a way, it uses a holistic view to emphasize the  relevance of preservation to be considered throughout the life cycle of records. The methodology is based on  a bibliographic survey composed of articles, books, and technical publications, to obtain a narrative review.  It is noteworthy that digital preservation has evolved to new heights, and requires the use of standards to  implement reliable computer systems. With this, the entire life cycle can be involved in an uninterrupted  chain of custody capable of ensuring the authenticity of digital records. Finally, a systemic-holistic approach  is advocated, in which records are planned and produced with a view of the preservation and access in the  long-term.

/pdf/preservacao-sistemica-para-repositorios-arquivisticos-423zad158s.pdf

Preservação sistêmica para repositórios arquivísticos

While global declines of pelagic shark populations have been recognized for several years, conservation efforts remain hampered by a poor understanding of their spatial distribution and ecology. Two species of conservation concern are the blue shark Prionace glauca and the shortfin mako shark Isurus oxyrinchus. To improve management of these species, this study examined their local abundance patterns, habitat preferences, and distribution in the Southeast Pacific. Catch per unit effort (CPUE) data from an artisanal fishery in Peru were used to identify geographic hot spots and model abundance estimates as a function of environmental variables, including the El Niño Southern Oscillation (ENSO). A 10 yr data series revealed declining annual landings since 2012, despite no changes in management structures. Significant aggregations of both species were found in southwestern Peruvian waters (74−76° W, 17−19° S), with both speciesspecific hot spots targeted by major fishing efforts. P. glauca CPUE increased during La Niña conditions (i.e. low water temperature anomaly), and CPUE of both species declined when water depths exceeded 1000 m. Correlations with lunar illumination and chlorophyll a were revealed in P. glauca and I. oxyrinchus, respectively. Modeling explained 57 to 61% of the deviance, indicating that other factors not included in the present study might account for unexplained variance in CPUE (e.g. thermocline depth, location of marine fronts, dissolved oxygen, and gear characteristics). Given the importance of the examined area to shark fisheries and the exploitation of multiple species of conservation concern, the information presented here can be used to inform management strategies designed to limit the depletion of pelagic sharks.

/pdf/spatial-ecology-of-blue-shark-and-shortfin-mako-in-southern-vouekhbvkp.pdf

Spatial ecology of blue shark and shortfin mako in southern Peru: local abundance, habitat preferences and implications for conservation

Este artigo realiza uma reflexao abrangente sobre as politicas de preservacao digital para documentos arquivisticos, com enfase na manutencao da fidedignidade e na garantia de acesso em longo prazo. Desta forma, sao perpassados os seguintes aspectos: a evolucao das tecnologias da informacao; o advento do documento digital; o uso de padroes abertos; o uso de metadados; os custos relacionados; a seguranca; e o planejamento da preservacao em longo prazo. A metodologia consiste no levantamento bibliografico-documental, composto por materiais previamente publicados, dentre eles: livros, teses, dissertacoes, textos em sites da Internet e artigos em periodicos cientificos indexados no Google Scholar. Constitui uma revisao de literatura, que aborda principalmente trabalhos contemporâneos, publicados nos ultimos quinze anos, periodo em que as discussoes sobre a preservacao digital se acentuaram. Desta forma, os dados coletados sao processados atraves da analise qualitativa, e posteriormente, estruturados em secoes tematicas, que apontam os principais entraves teoricos.

/pdf/politicas-de-preservacao-digital-para-documentos-1ksbnsl1rm.pdf

Daniel Flores

Papers

A comparison study of periapical repair in dogs' teeth using RoekoSeal and AH plus root canal sealers: a histopathological evaluation.

Repositórios digitais confiáveis para documentos arquivísticos: ponderações sobre a preservação em longo prazo

Preservação sistêmica para repositórios arquivísticos

Spatial ecology of blue shark and shortfin mako in southern Peru: local abundance, habitat preferences and implications for conservation

Políticas de preservação digital para documentos arquivísticos