Cyanocrylates have been widely used in the medical and dental fields for several years. In Dentistry, cyanoacrylates have been used for suturing, pulp capping, as retrofilling material in endodontic surgeries, and as cervical plug for pulpless teeth bleaching. The biocompatibility of these adhesives has been the topic of many researches and subcutaneous implantation is an effective methodology for these studies. The present study evaluated the biocompatibility of three different cyanoacrylate-based adhesives. Thirty-six Wistar rats were used, divided into four groups of 9 animals each: A (control) - distilled water, B - cyanoacrylate ester (Super Bonder), C - n-butyl-cyanoacrylate (Histoacryl) and D - alpha-cyanoacrylate (Three Bond). The materials were dispensed in sponges of polyvinyl chloride, the animals were incised and the sponges were inserted in the subcutaneous tissue and sutured. Each group was sub-divided according to the time of sacrifice of the animals: 7, 21 and 45 days. Subjective analysis of the histologic material showed that all groups presented some degree of irritability, but the inflammatory reaction decreased with the experimental time in all groups. Group D showed an inflammatory reaction which was closer to that of the control group and was considered to have good biocompatibility. Groups B and C were similar and presented more aggressive inflammatory reactions when compared to the control group. Based on the results, it was concluded that alpha-cyanoacrylate (Three Bond) was the most biocompatible adhesive because it caused the lowest levels of inflammation.

O objetivo deste estudo é avaliar a capacidade antimicrobiana dos cimentos obturadores de canal: N-Rickert, Sealapex, AH Plus e também do Agregado Trióxido Mineral (MTA) e Cimento de Portland. O método utilizado foi a difusão em Ágar, em placas previamente inoculadas com os seguintes microorganismos: C. albicans, S. aureus, E. faecalis, E. coli. A leitura do diâmetro do halo de inibição do crescimento microbiano foi realizada, após 24 horas de incubação, em estufa a 37°C. De acordo com a metodologia empregada, foi possível concluir que: somente os cimentos obturadores AH Plus e N-Rickert apresentaram atividade antimicrobiana contra C. albicans, S. aureus e E. coli; não foi observada atividade antimicrobiana no cimento de Portland, MTA e Sealapex. O cimento N-Rickert apresentou halos de inibição maiores variando de 8 a 18 mm. O microorganismo E. faecalis foi resistente contra todos os cimentos testados.

The purpose of this study is to evaluate the antimicrobial activity of the endodontic sealers: N-Rickert, Sealapex, AH Plus, Mineral Trioxide Aggregate (MTA) and portland cement. The Agar diffusion method was used in plates previously inoculated with the following microorganisms: C. albicans, S. aureus, E. faecalis, E. coli. The diameters of microbial inhibition zones were measured after 24 hours of incubation in kiln at 37°C. According to the methodology used, it was possible to conclude that only the sealers AH Plus and N-Rickert presented antimicrobial activity against C. albicans, S. aureus, and E. coli; no antimicrobial activity in MTA, Sealapex and portland cement was observed. N-Rickert presented the largest inhibition zones varying from 8 to 18 mm, and the microorganism E. faecalis was resistant against all sealers tested.

O selamento do sistema de canais radiculares é de fundamental importância para o sucesso do tratamento endodôntico. Para um adequado selamento apical, devemos considerar, entre outros fatores, a presença da smear layer e o cimento obturador empregado. Após o preparo do canal, esta camada deve ser removida pois, entre outros fatores, impede contato íntimo entre a parede dentinária e o material obturador. O objetivo deste trabalho foi avaliar a capacidade seladora de quatro diferentes cimentos obturadores após remoção da smear layer com irrigação com EDTA-T a 17% ou irradiação com laser Er:YAG. Os 46 dentes humanos foram instrumentados e a smear layer foi removida por irrigação com EDTA-T ou irradiação com laser Er:YAG. Os canais foram obturados com 4 diferentes cimentos obturadores: Sealapex, Ketac Endo, AH Plus e N-Rickert. O método de remoção da smear layer não interferiu no selamento apical. Quanto aos cimentos testados, o AH Plus e o N-Rickert permitiram menos infiltração do corante quando comparados aos cimentos Sealapex e Ketac Endo.

The sealing of the root canal system is of fundamental importance for successful endodontic treatment. To obtain an adequate apical seal, many factors must be considered such as the presence of smear layer and the sealer applied. After canal preparation, this layer must be removed because it prevents close contact between the dentinal walls and the sealing material. The goal of this study was to evaluate the sealing ability of four different sealers after smear layer removal with either 17% EDTA-T irrigation or Er:YAG laser irradiation of 46 teeth. The canals were sealed with four different sealers: Sealapex, Ketac Endo, AH Plus and N-Rickert. The method for smear layer removal did not influence apical sealing. AH Plus and N-Rickert allowed less dye leakage when compared to Sealapex and Ketac Endo.

O presente experimento avaliou, in vitro, a alteração cromática das coroas dentais inicialmente, registrada a partir de uma análise espectrofotométrica e da observação visual, nos seguintes tempos experimentais: leitura inicial (LI), leitura após o escurecimento (LE) e leitura imediatamente após o clareamento (LC), leitura 15 dias após o clareamento (LC15) e leitura 30 dias após o clareamento (LC30). Depois de encontrados os valores de L* (luminosidade) a* e b* (matiz e saturação), com os quais se quantificou as alterações cromáticas dos espécimes; as diferenças de cor (deltaE) foram obtidas com auxílio do programa CIE Lab. A análise estatística dos resultados obtidos, pelo estudo espectrofotométrico, não mostrou diferença significante quando comparado o procedimento de clareamento tradicional com o ativado por laser Er:YAG. Não houve diferença estatística entre os grupos nos tempos experimentais de 15 e 30 dias.

This experiment aimed at evaluating, in vitro, the chromatic alteration of dental crowns submitted to internal bleaching. Color alterations were evaluated by means of spectrophotometric analysis and visual observation, at the following experimental phases: initial reading (LI), after-darkening reading (LE), immediate after-bleaching reading (LC), bleaching checked after 15 days (LC15) and after 30 days (LC30). After finding the values of L* (luminosity), a* and b* (shade and saturation), which made it possible to quantify the chromatic alterations of the specimens, color differences (deltaE ) were assessed by means of the CIE Lab Program. The statistical analysis of the results did not reveal any significant difference between conventional bleaching and bleaching activated by Er:YAG laser. No statistical difference was observed between the results after 15 and 30 days, for both experimental groups.