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Este estudo avaliou in vitro o selamento, no sentido cérvico-apical, de canais radiculares obturados pela técnica de condensação lateral de cones de guta-percha, sistema Ultrafil e obturadores Thermafil. O selamento foi testado por meio de suspensão de Staphylococcus aureus e saliva artificial. Houve passagem do microrganismo ao longo dos canais radiculares, em todas as obturações, independente da técnica utilizada. Os resultados revelaram um percentual de 85,71%, 100% e 68,42% para a técnica condensação lateral, sistema Ultrafil e obturadores Thermafil, respectivamente. Abstract : This study has evaluated in vitro the sealing in the cervical-apical direction of filled root canals by the lateral condensation method of gutta-percha points, the Ultrafil system, and the Thermafil "obturators". With that end, 68 teeth had their crowns sectioned and were prepared by the step back technique. Next, were gathered 5 experimental groups, 2 of these with 4 elements each, (positive and negative control group) and the remaining 3 made up by 20 teeth each, filled by the lateral condensation method of gutta-percha points, the Ultrafil system, and the Thermafil "obturators". The root canals of the teeth belonging to the positive control group remained empty, whereas those that were part of the negative control one were filled by the lateral condensation technique. In all of the specimens, the sealer applied was the canal Fill. Upon conclusion of the filling stage, the cavities of access, except for those belonging to the teeth pertaining to the positive control group, were sealed with Lumicon and were exposed to 37° C, in 100 % humidity, for 48 hours. After this period, the sealing was removed, except in the teeth belong to the negative control group. The root surface of all the teeth, except for the final millimeter, was made impermeable. The sealing was tested through the Staphylococcus aureus suspension and artificial saliva, which, as they were placed in the internal part of the device set up for the accomplishment of the experiment, got in touch with the coronary portion of the filling. The entrance of the microorganism in the apical region was detected by the color alteration of the selective means, in which the apices were emerged and that in the presence of Staphylococcus aureus, changed from pink into yellow. All of the devices (test bodies), were incubated at 37° and observed daily during the 90 days with the purpose of detecting the presence of microorganism. Infiltration occurred in all of the elements of the positive control group. However, in the specimens that made up the negative control group, the central color remained unaltered during the entire experiment period. There was passage of microorganism along the root canal, in all of the fillings, regardless of the technique employed. The results revealed a percentage of infiltration of 85,71%, 100%, and 68,42% for the lateral condensation technique, the Ultrafil system, and the Thermafil "obturators", respectively. |
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