RESUMO
BACKGROUND: The main cause of endodontic failure is the persistence of microorganisms that cause an intraradicular or extratradicular infection and that become resistant to disinfection measures. The objective of this review is to identify the microbiota associated with endodontic failure, as well as the reasons why these microorganisms are capable of surviving basic disinfection measures. MATERIAL AND METHODS: Systematic search of scientific articles in the databases PubMed with the following keywords "Endodontic Infections", "Endodontic Microbiology", "Endodontic Failure", "Enterococcus Faecalis", "Endodontics Retreatment" was carried out. Case reports and articles with publication date prior to 2000 were not included in this review. RESULTS: Most authors highlight E. faecalis as the main microorganism associated with endodontic failure, nevertheless there are recent studies that isolate, to a greater extent, other bacteria such as Fusobacterium nucleatum and Propionibacterium. DISCUSSION: These microorganisms have in common the following proprieties, which make them able to escape the disinfection measures: the ability to form a biofilm, to locate in areas unreachable to root canal instrumentation techniques, synergism, the ability to express survival genes and activate alternative metabolic pathways.
Assuntos
Cavidade Pulpar , Tratamento do Canal Radicular , Bactérias , Biofilmes , Enterococcus faecalisRESUMO
Background: The main cause of endodontic failure is the persistence of microorganisms that cause an intraradicular or extratradicular infection and that become resistant to disinfection measures. The objective of this review is to identify the microbiota associated with endodontic failure, as well as the reasons why these microorganisms are capable of surviving basic disinfection measures. Material and Methods: Systematic search of scientific articles in the databases PubMed with the following key-words "Endodontic Infections", "Endodontic Microbiology, "Endodontic Failure", "Enterococcus Faecalis", "Endodontics Retreatment" was carried out. Case reports and articles with publication date prior to 2000 were not included in this review. Results: Most authors highlight E. faecalis as the main microorganism associated with endodontic failure, nevertheless there are recent studies that isolate, to a greater extent, other bacteria such as Fusobacterium nucleatum and Propioni bacterium. Discussion: These microorganisms have in common the following proprieties, which make them able to escape the disinfection measures: the ability to form a biofilm, to locate in areas unreachable to root canal instrumentation techniques, synergism, the ability to express survival genes and activate alternative metabolic pathways
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Assuntos
Humanos , Cavidade Pulpar , Tratamento do Canal Radicular , Bactérias , Biofilmes , Enterococcus faecalisRESUMO
Objetivos: En este estudio se pretende valorar el grado de enderezamiento de los conductos radiculares que se obtiene tras la instrumentación de éstos con limas manuales de acero y con limas rotatoria de Ni-Ti. Material y métodos. Para ello seleccionamos 30 molares inferiores y calculamos el grado de curvatura de cada uno de los 2 conductos mesiales mediante la técnica de Schneider. A continuación instrumentamos el conducto mesiovestibular con limas K de acero inoxidable y técnica de step-back; y el mesiolingual con el sistema rotatorio de limas Ni-Ti Hero Shaper@ según indicaciones del fabricante. Tras la instrumentación volvimos a calcular la angulación de los conductos con la misma técnica. Resultados. Los resultados mostraron que hubo menor transporte apical en el grupo de limas Ni-Ti que en el grupo de limas de acero con una diferencia estadísticamente significativa (p<0,05). Conclusiones: Por ello, pese a que ambas técnicas provocan una deformación del conducto, se recomienda usar en conductos curvos una instrumentación rotatoria con limas Ni-Ti (AU)
Aim: The purpose of this study was to determine the extent to which root canals were straightened after their preparation with hand stainless steel K-files and with rotary Ni-Ti files. Material and methods. Thirty mandibular molars were selected and the degree of root curvature was calculated in each of the two mesial canals, using the Schneider technique. Following this, the mesiobuccal canals were cleaned with stainless steel K-files and step-back technique, and the mesiolingual canals were cleaned with Ni-Ti Hero Shaper® rotary files according to the manufacturer´s instructions. After preparation, the angle of the canals was re-calculated in the same way as before. Results. The results showed that there was less apical transportation in the Ni-Ti files group than in the stainless steel one, with a statistically significant difference (p<0,05). Conclusion: In spite of both techniques cause canal deformation, it is recommended to use Ni-Ti files in curved canals (AU)
