Cention-N: una opción restaurativa directa e innovadora para el sector posterior

RESUMEN Introducción: La industria odontológica está en constante evolución respecto a la concreción de materiales dentales que mejoren la calidad de vida. Sin embargo, debido al gran número de estos, es imprescindible realizar comparaciones de propiedades biomecánicas que definan los de mejor rendimiento. Objetivo: Identificar las ventajas y desventajas del material de restauración Cention-N, con respecto a la resina compuesta, el ionómero de vidrio y la amalgama. Métodos: Se hizo una investigación bibliográfica en las bases PubMed, Scielo, Semantic Scholar, ScienceDirect, Medigraphyc y Redalyc. Se usaron como palabras clave: Cention-N, material restaurativo, amalgama, resina compuesta, el ionómero de vidrio; combinadas con operadores booleanos AND y OR. Se seleccionaron artículos originales y de revisión, entre otros documentos, para examinar 4 características: microfiltración, dureza, rugosidad superficial y resistencia al cizallamiento. El 50 % de los artículos escogidos se publicaron en los últimos 5 años. Resultados: Se seleccionaron un total de 13 artículos, 1 página web y 1 libro, acorde con los filtros de selección y objetivo de investigación. El Cention-N, con respecto a los demás materiales considerados, presentó menor puntuación de microfiltración (0,28 ± 0,18), mayor dureza (77 N/mm2), menor rugosidad (442,98 ± 62,45 nm) y mayor resistencia al cizallamiento (14,38 ± 3,88 MPa). Resta evaluar sus propiedades mecánicas ante procedimientos abrasivos como el blanqueamiento dental y a cargas altas como en el bruxismo. Conclusión: Cention-N es una opción prometedora como material restaurador del sector posterior al evidenciar una menor microfiltración y rugosidad; así como mayor resistencia al cizallamiento y dureza, en comparación con otros materiales restaurativos estudiados.

ABSTRACT Introduction: Dental industry is constantly evolving regarding the realization of dental materials that improve the quality of life. However, due to the large number of these, it is essential to perform intercomparisons of biomechanical properties that define those with the best performance. Objective: To identify the advantages and disadvantages of Cention-N restorative material with respect to composite resin, glass ionomer and amalgam. Methods: A bibliographic search was made in the PubMed, Scielo, Semantic Scholar, ScienceDirect, Medigraphyc and Redalyc databases. The following keywords were used: Cention-N, restorative material, amalgam, composite resin, the glass ionomer; combined with Boolean AND and OR operators. Original and review articles, among other documents, were chosen to examine 4 characteristics: microfiltration, hardness, surface roughness and shear resistance. 50% of the articles are from the last 5 years. Results: A total of 13 articles, 1 webpage and 1 book, were found according to the selection filters and research objective. The Cention-N, with respect to the other materials considered, presented a lower microfiltration score (0,28 ± 0,18); higher hardness (77 N/mm2); lower roughness (442,98 ± 62,45 nm) and higher shear strength (14,38 ± 3,88 MPa). However, it remains to evaluate its mechanical properties before abrasive procedures such as teeth whitening and at high loads such as bruxism. Conclusion: Cention-N is a promising option as a posterior sector restorative material as it shows less microfiltration and roughness; as well as greater resistance to shear and hardness, compared to other restorative materials studied.

Effect of different structural parameters of filter rod on mechanical properties of new vena cava filter / 生物医学工程学杂志

The dynamic analysis of the implantation process of a new vena cava filter was carried out by finite element analysis method to reveal the influence of the angle, length, width and thickness of the filter rod on its mechanical properties and the inner wall of the blood vessel. The results showed that the high-stress and high-strain areas of the filter were mainly concentrated in the connection between the filter rod and the filter wire. With the increase of the angle of the filter rod, the maximum equivalent stress and the maximum elastic strain on the filter wall decreased, while the maximum equivalent stress on the vascular wall increased. With the increase of the length of the filter rod, the maximum equivalent stress and strain peak of the filter wall increased, but the maximum equivalent stress of the vessel wall decreased. With the increase of the width and thickness of the filter rod, the maximum equivalent stress of the filter wall, the maximum elastic strain and the maximum equivalent stress of the vessel wall all showed an upward trend. The static safety factor of all filter models was greater than 1, and the structure after implantation was safe and reliable. The results of this study are expected to provide a theoretical basis for the structural optimization and deformation mechanism of the new type vena cava filter.

Influência da imobilização gessada nas propriedades biomecânicas do músculo gastrocnêmio / Influence of immobilization on the biomechanical properties of the gastrocnemius muscle

The study of the effects of the immobilization on the muscular tissue is a very important issue and the measurement of the biomechanics properties provides relevant knowledgement about adaptations occurred from functional demands...