PA 1% with a low concentration of hydrogen peroxide yielded a lower amount of smear layer and a larger number of open dentin tubules in the dentin of the post space when compared with PA 1% with a high concentration of hydrogen peroxide, despite maintaining a similar oxygen concentration in these dentin residues.
This study aimed to assess the physicochemical properties of a repair material in the Brazilian market, BioMTA, in comparison to other two materials currently in use (Biodentine and MTA Angelus). The initial setting time was evaluated using Gillmore needle. The pH was measured with a pH-meter after 24 h, 3, 7, 14 and 21 days. The radiopacity was determined using the equivalence in millimeters of aluminum (mm Al) from digitized occlusal radiographs. Solubility was determined after immersion in water for 7 days. The data were analyzed by one-way ANOVA and Tukey tests (a=0.05). The BioMTA initial setting time (5.2 min) was lower than the other materials (p<0.05). All materials showed an alkaline pH at 21 days. At 24 h, BioMTA was the most alkaline material (p<0.05); and at 3, 7, 14 and 21 days there was no difference between BioMTA and Biodentine (p>0.05), both being more alkaline than MTA Angelus (p<0.05). The radiopacity of BioMTA (4.2 mm Al) was significantly higher compared to Biodentine (p<0.05) and lower than MTA Angelus (p<0.05). The solubility of the materials was -4.2%, -1.6% and 4.1% for BioMTA, MTA Angelus and Biodentine, respectively, with a significant difference between them (p<0.05). Therefore, it can be concluded that BioMTA displayed a shorter setting time, an alkaline pH, a higher radiopacity, and a gain in mass.
Objetivo: Estimar la asociación entre factores de riesgo y la ocurrencia de enfermedades, accidentes y ausentismo laboral en trabajadores formales. Método: Estudio de cohorte retrospectiva usando dos fuentes de información: registro de evaluaciones ocupacionales preventivas y de episodios de accidentes y enfermedades laborales (2009-2012). Se realizó un análisis descriptivo de variables de salud y de factores de riesgo. Regresiones logísticas para la ocurrencia de enfermedades y accidentes. Se usó una regresión Poisson-cero-inflado para el ausentismo laboral. Resultados: los ≥ 60 años tienen un exceso de riesgo de enfermedad laboral (OR-ajustada 19,18 respecto a ≤ 30 años) y los sedentarios una OR-ajustada 1,75. Los ≤ 30 años tienen una OR-ajustada de 1,38, los que tienen circunferencia de cintura (CC) superior a la recomendada una OR-ajustada de 1,31 y los sedentarios 1,23 para la probabilidad de accidentes de trabajo. Las mujeres tienen una OR-ajustada 1,99 y CC-superior 1,29 para la probabilidad de accidente de trayecto. Ser mujer (IRR 1,45), tener ≥ 60 años (IRR 2,69), trabajar en actividades inmobiliarias (IRR 2,37) y en explotación de minas (IRR 2,38), tienen una probabilidad mayor de más días de ausentismo. Conclusiones: Factores no modificables (sexo y edad), junto con factores modificables, como el sedentarismo y el estado nutricional, contribuyen a eventos laborales no deseados.
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