Objectives: To compare microhardness along the root canal post space of two resin cements in different shades and a dual-cure resin core material. Study Design: Root canals of 21 bovine incisors were prepared for post space. Translucent posts (X•Post, Dentsply DeTrey) were luted using one the following resin luting agent: Calibra (Dentsply DeTrey) in Translucent, Medium and Opaque shades, RelyX Unicem (3M ESPE) in Translucent, A2 and A3 shades and the dual-cure resin core material Core•X flow. All materials were applied according to manufacturers’ instructions and were all photopolymerized (Bluephase LED unit, Ivoclar Vivadent, 40s). After 24 hours, roots were transversally cut into 9 slices 1 mm thick from the coronal to apical extremes, three corresponding to each root third. Then, VHNs were recorded (100 gf, 30 s) on the resin luting materials along the adhesive interface in all sections. Data were analyzed by two-way ANOVA and SNK tests (α=0.05). Results: A significant influence on microhardness of resin luting material in their respective shades (p<0.001), root third (p<0.001) and interactions between them was detected (p<0.001). RelyX Unicem cement showed the highest microhardness values and Calibra the lowest, regardless of the shade selected. All resin luting materials tested exhibited a significantly higher microhardness in the cervical third. Conclusions: Microhardness of resin luting agents tested inside the canal is dependent on material brand and resin cement shade seems to be a less relevant factor. Microhardness decreased along the root canal, regardless of the shade selected. Key words:Cement shade, degree of conversion, dual-cured resin cements, fiber posts, microhardness, root thirds.
Análisis de la simetría del tamaño dentario mediodistal de la misma muestra en denticiÓn mixta y permanente.Estudio longitudinal Análisis de la simetría del tamaño dentario mesiodistal de la misma muestra en dentición mixta y permanente. Estudio longitudinalAustro Martínez M.D. *, Ostos Garrido M.J. * *, García Ballesta C. ***, Pérez Lajarín L.*** RESUMENEn el presente trabajo se estudian los diámetros mesiodistales de los dientes temporales y permanentes de la misma muestra y se analiza la existencia de simetría entre dientes homólogos. Dicho estudio fue realizado inicialmente sobre una muestra de 267 niños con dentición mixta, 90 (34%) niñas y 177 (66%) niños, de Andalucía Oriental, con edades comprendidas entre 8 y 10 años, transcurridos cuatro años volvimos a analizar a los mismos niños con dentición permanente, y sólo obtuvimos una muestra de 171, de los cuales 69 (40%) eran niñas y el 102 (60%) niños, con una edad media de 12 años y un rango de 11 a 13 años, el 21 % de la muestra tenía 11 años, el 46,29% presentaba una edad de 12 y el 32% de 13 años, utilizándose como criterios de selección, que no tuvieran alteraciones morfológicas, pérdida dentarias, apiñamientos importantes, entre otros factores. El tamaño dentario se midió, como la máxima distancia entre los puntos de contacto mesial-distal de la corona, utilizándose un calibre de punta fina, con una precisión de 0,1 mm. Todas las mediciones fueron realizadas por el mismo observador, directamente en boca, utilizando luz natural y espejos desechables. El análisis estadístico incluyó pruebas como la "t" de Student, con un nivel de significación estadística de p< 0,05. Los principales resultados incluyen la existencia de simetría entre dientes homólogos, tanto en dentición temporal como en dentición permanente.Palabras claves: Tamaño mesiodistal de los dientes, simetría. ABSTRACTIn the present work is analysed the mesiodistal diameters of the temporal and permanent teeth of the same sampie to calculate the symmetry.The first sample was 267 children, 90 girls (34%) and 177 (66%) boys from Oriental Andalusia, aged between 8 and 10 years old. After four years, we analysed the same children with permanent teething and we obtained just a sample of 171, 69 girls (40%) and 102 (60%) boys, with an average age of 12 years and a range from 11 to 13 years, using as criteria selection not having morphological alteration, teeth loss, important congestions, between other elements.The teething dimension was measured as the maximum distance between the mesiodistal contact points of the crown, using a sharp-end gauge, with a 0,1 mm precision. Al! the measurements were made by the same viewer, directly to the mouth. For the statistic analysis was used the t Student test, with a level of statistic signification of p<0,05.AVANCES EN ODONTOESTOMATOLOGÍA/305
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