Objective: Compare in vitro the apical seal of thermoplastic filling systems, GuttaCore® and E&Q Master®, from the perspective of microfiltration. Methods: Forty single-rooted teeth were instrumented with rotary system and irrigated with 2.5% sodium hypochlorite and 17% EDTA. The samples were divided into two groups (20 for each system); sealed and placed in the incubator at 37°C and 100% humidity for 3 days. Each sample was covered with colored varnish except the last 3 apical millimiters to be immersed in 2% methylene blue for 3 days and centrifuged for 20 min at 3000 rpm. The samples were washed and fractured axially for their analysis in the stereomicroscope by means of photographs. For the data analysis we used the t Student test with a level of significance of 5%. Results: The mean microfiltration values were 0.660 mm and 0.825 mm for GuttaCore and E&Q Master respectivel...

Objetivo: Comparar el sellado apical in vitro de los sistemas de obturación termoplastificada, GuttaCore® y E&Q Master®, desde la perspectiva de microfiltración. Métodos: Cuarenta piezas unirradiculares se instrumentaron con sistema rotatorio e irrigaron con hipoclorito de sodio al 2,5% y EDTA al 17%. Las muestras se dividieron en dos grupos (n=20); se obturaron y colocaron en estufa incubadora a 37°C y 100% de humedad durante 3 días. Cada muestra se cubrió con barniz de colores excepto 3 mm apicales para ser sumergidas en azul de metileno al 2% por 3 días, y centrifugados por 20 min a 3000 rpm. Las muestras se lavaron y fracturaron axialmente para su análisis, mediante fotografías, en el estereomicroscopio. Para el análisis de datos se utilizó la prueba t de Student con un nivel de significancia del 5%. Resultados: Los valores medios de microfiltración fueron 0,660 mm ...

Objective: To determine the apical microfiltration of three cements used in retrograde obturation. Methods: 45 monoradicular pieces standardized to 16 mm in length were instrumented with manual ProTaper® system and irrigated with 5.25% NaClO. The samples were sealed with ProTaper® F3 main cone and Denstply® accessories #A and #B; an apical recession of 3 mm was performed, subsequently a 3 mm of obturation was removed with ultrasound (Satelec Acteon) using tip s12/70D; the samples were divided into three groups to perform retrograde filling, each with different sealing cements. The samples were incubated at 37°C for 3 days; then covered with nail varnish except 2 mm apical to be immersed in 1% methylene blue for 48 hours, washed and longitudinally cut with #2 diamond disc for analysis in the stereo microscope (EduBlue ED 1402S), with the help of a micrometer (Stainless Hardened); diff...

Objective: To determine the apical microfiltration of three cements used in retrograde obturation. Methods: 45 monoradicular pieces standardized to 16 mm in length were instrumented with manual ProTaper® system and irrigated with 5.25% NaClO. The samples were sealed with ProTaper® F3 main cone and Denstply® accessories #A and #B; an apical recession of 3 mm was performed, subsequently a 3 mm of obturation was removed with ultrasound (Satelec Acteon) using tip s12/70D; the samples were divided into three groups to perform retrograde filling, each with different sealing cements. The samples were incubated at 37°C for 3 days; then covered with nail varnish except 2 mm apical to be immersed in 1% methylene blue for 48 hours, washed and longitudinally cut with #2 diamond disc for analysis in the stereo microscope (EduBlue ED 1402S), with the help of a micrometer (Stainless Hardened); diff...

Objective. To evaluate the wear (roughness) and topographic changes of the Wave One Gold primary and Reciproc Blue R25 files after instrumentation at 3, 6 and 9 uses in curved canals. Methods. Ex vivo study, consisting of 10 new Reciproc Blue R25 and 5 Wave One Gold primary reciprocating files and 46 mandibular first molars with severe curvature. Molars were divided into 2 groups (23 molars in each group): group 1 Reciproc Blue R25/.08 and group 2 Wave One Gold Primary (25/.07). Reciprocating files from the two groups were analyzed with the contact profilometer at 0, 3, 6 and 9 uses. The measurement was made in the apical, middle, and coronal thirds, and in each analysis, 2 files were observed with the Scanning Electron Microscope. Subsequently, the analysis in the SPSS version 26 IBM ® program was performed using t-Student and Anova tests for normality (p<0.05). Results. There is no...