Browsing by Autor "Karla D. Mora Barrios"

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    Estudio comparativo de la microestructura interna de diferentes marcas de pernos de fibras de vidrio
    (2012) Karla D. Mora Barrios; Angélica M. Sifontes Vivas; Alejandro Miranda; Gladys Rojas Palaviccini; Rigoberto Dugarte
    The fiberglass bolts used in reconstruction of teeth, have become popular for having an elastic modulus similar to dentin and highly aesthetic color, however, have presented clinical failures of mechanical fatigue of the bolt, so it is suspected that a relevant factor is the microstructural quality. Our objective was to evaluate the internal ultrastructure of different brands of glass fiber posts. Cross sections were assessed cinco types of glass fiber posts (FRC Postec Plus Ivoclar Vivadent ®, Coltene Whaledent ParaPost ® Fiber White, Coltene Whaledent ParaPost Lux ® Fiber, Glass Fiber Post superposter ® and Rx Reforpost Angelus ®). With a scanning electron microscope images were obtained at 100μm, 500μm and 2500μm increase. With Photoshop conversion was performed micron pixel and calculated: total area, area of defect, homogeneity in the diameter of the fibers and fiber-matrix relationship. The most homogeneous, compact and not introduced imperfections was the FRC Postec Plus. The White Fiber ParaPost showed fiber diameters homogeneous and a lower concentration of fiber. The Rx Reforpost shows more obvious defects. The fiberglass bolts have different qualities microstructural defects and some show low consistency in its fibers. The microstructural quality is an important aspect to consider when selecting a bolt that  requires an adequate mechanical performance stump reconstructions of anterior teeth.