Evaluación de la calidad de las obturaciones endodónticas realizadas por estudiantes de posgrado, en molares superiores, con técnicas de instrumentación manual y rotatoria / Evaluation of the quality of root canal fillings made bypostgraduate students in upper molars with manualand rotary instrumentation techniques

Objetivo: el objetivo de este estudio fue evaluar la calidad de las obturaciones endodónticas en molares superiores instrumentados con técnicas manuales y rotatorias, por estudiantes de posgrado. Materiales y métodos: para este estudio, se analizaron las radiografías de endodoncias que fueron realizadas durante un año por alumnos de un curso de posgrado en endodoncia, en primeros y segundos molares superiores, con ténicas de instrumentación manual y rotatoria y posteriormente obturadas con técnica de condensación lateral. Se analizó la calidad de las obturaciones endodónticas en función de la longitud y la homogeneidad de la masa de gutapercha. Resultados: el 53,6 por ciento de las obturaciones estaba dentro de los límites del conducto radicular y en el 65,2 por ciento de los casos, la homogeneidad fue incorrecta. En cuanto a la longitud, no se verificaron diferencias estadísticamente significativas entre las técnicas, como ocurrió con la homogeneidad (p<0,05). La frecuencia de inadecuados en ewsta última fue mayor para la técnica manual. La mayor cantidad de fallas en la obturación se registró en el conducto mesiovestibular. Conclusión: la calidad de las obturaciones no depende de la técnica de instrumentación empleada, sino de la experiencia del profesional interviniente y del tipo de conducto radicular tratado.(AU)

Aim: the aim of this study was to evaluate the quality ofendodontic fillings in upper molars instrumented with manualand rotary techniques by posgraduate students.Materials and methods: Radiographs of first and secondupper molars root canal treatments performed by studentsof a posgraduate endodontic course during a year wereanalyzed. Either manual or rotary instrumentation techniqueswere used and obturation was carried out using lateral condensation.Quality of endodontic obturation was analyzed accordingto length and homogeneity.Results: There were acceptable lengths of root canalfillings in 53.6% and homogeneity was incorrect in 65.2% ofthe cases. There was no statistically significance difference betweentechniques for the case of length, but there were statisticallysignificance difference for homogenity (p>0.05). Moredefective obturations were registered in the mesiobuccal canal.Conclusion: Independent of the instrumentation technique,the quality of root fillings is inherent to the professionalexperience and the type of root canal treated.

Ex vivo evaluation of coronal and apical microbial leakage of root canal - Filled with gutta-percha or Resilon/Epiphany root canal filling material.

Objective: This ex vivo study compared coronal and apical microleakage of root canals filled with Resilon/Epiphany (RE) or gutta-percha/Grossman sealer (GP), using either lateral condensation (LC) or System B (SB) technique. Materials and Methods: Specimens in eight experimental groups were obturated using the following materials and techniques: Groups 1 and 3 - GP and LC; groups 2 and 4 - GP and SB; groups 5 and 7 - RE and LC; groups 6 and 8 - RE and SB. Apical and coronal leakages were tested using bacterial methods. For coronal analysis, the number of days required for complete contamination of the root canals was recorded according to observation of the brain heart infusion broth turbidity for 15 weeks. For apical analysis, the teeth were cleaved and the leakage was measured at 30 days. Data were collected for each sample and analyzed statistically with the Chi-square and ANOVA tests. Results: Leakage was found in all groups. The difference between filling materials, obturation techniques, and median time of leakage was not statistically significant for coronal ( P=0.847) and apical ( P=0.5789) leakages. Conclusion: There were no differences between the different filling materials (gutta-percha/Grossman sealer and Resilon/Epiphany) and obturation techniques (lateral condensation and system B technique) in coronal or apical leakages.

Avaliação da citotoxicidade de cimentos endodônticos quanto a liberação de peróxido de hidrogênio e óxido nítrico em culturas de macrófagos peritoneais de camundongos / Evaluation of citotoxicity of root canal sealers due to realese of hydrogen peroxide and nitric oxide in peritoneal rat macrophage culture

Avaliou-se a citotoxicidade dos cimentos Topseal, EndoRez, Tubli-Seal e Kerr Pulp Canal Sealer E.W.T. quanto a liberação de derivados do oxigênio no contato cimento/cultura de macrófagos peritoneais de camundongos. Respectivamente os cimentos que mais liberaram H2O2 na concentração de 9 mg/ml foi o Topseal > Zimosan > EndoRez > Tubli-Seal = Kerr Pulp E.W.T. e na concentração de 18 mg/ml foi o Topseal > Zimosan = EndoRez > Tubli-Seal > Kerr Pulp E.W.T. Os que mais liberaram NO na concentração de 9 mg/ml foi o LPS > Topseal > Kerr Pulp E.W.T. > Tubli-Seal = EndoRez e na concentração de 18 mg/ml foi o LPS > Topseal = Kerr Pulp E.W.T. > Tubli-Seal > EndoRez

It was evaluated the citotoxicity of the sealers Topseal, EndoRez, TubliSeal and Kerr Pulp Canal Sealer after exposure to rat peritoneal macrophage culture, due to oxigen derivate liberation. Respectively, the sealer that, liberated more H2O2 at 9 mg/ml concentration were Topseal > Zimosan > EndoRez > Tubli-Seal = Kerr Pulp E.W.T. and in concentration of 18 mg/ml were Topseal > Zimosan = EndoRez > Tubli-Seal > Kerr Pulp E.W.T. The greatest liberation of in NO concentration of 9 mg/ml were LPS > Topseal > Kerr Pulp E.W.T. > Tubli-Seal = EndoRez and in concentration of 18 mg/ml were LPS > Topseal = Kerr Pulp E.W.T. > Tubli-Seal > EndoRez