Comparison of physical properties of three commercial composite core build-up materials

Abstract

Various materials have been used for core build-up when restoring the coronal portion of the tooth. Currently, bulk-fill resin composites have been produced to restore a large posterior cavity in single increment. This study aimed to evaluate the compressive strength, flexural strength, and microhardness of three commercial composite core build-up materials. All data were analyzed by oneway ANOVA and Tukey test methods (α=0.05). Flexural strength data were subjected to Weibull statistics analysis. All three groups presented significant differences in the compressive strength, flexural strength, and Knoop hardness. Filtek TM Z350 XT had the greatest compressive strength (MPa) and Knoop hardness while Filtek TM bulk fill had the highest flexural strength. MultiCore ® Flow had the lowest properties; however, it revealed the highest Weibull modulus (m) value. With regard to the properties tested in this study, bulk-fill resin composite can be used as an alternative to conventional resin composite for core build-up material.

Surface roughness and filler particles characterization of resin‐based composites

“…These features are greatly important, since the finishing/polishing process is based on the removal of substrate particles by a harder material at multiple stages, in which finer scratches are introduced onto the surface to remove deeper scratches (Anusavice, Shen, & Rawls, ). Aluminum oxide presents higher Vickers hardness than all the evaluated materials (Al‐Samadani, ; Anusavice et al, ; Chinelatti, Chimello, Ramos, & Palma‐Dibb, ; Eliades, Birpou, Eliades, & Eliades, ; Garoushi, Vallittu, & Lassila, ; Warangkulkasemkit & Pumpaluk, ), and, therefore, it is capable of polishing the surfaces of the samples efficiently. Besides, the Sof‐Lex system is believed to promote homogeneous abrasion of fillers and organic resin matrix (Abzal et al, ), resulting in a similar surface aspect even for different composites.…”

Physico-mechanical characterization and fracture reliability of dental resin composites for enamel restoration

“…The characteristic strength corresponds to the strength at a failure probability of approximately 63% [33], so that the former resin composites are definitely stronger than the latter ones, supporting more loads and stresses during function. The greatest characteristic strength of Llis may be also associated with a more uniform and homogeneous structure, perhaps free of voids and defects, which directly influences on the overall mechanical behavior of the material [34].…”

Comparación in vitro de la resistencia a la compresión y resistencia flexural de resinas Bulk Fill (Opus™ Bulk Fill, Tetric® N-Ceram Bulk Fill y Filtek™ Bulk Fill)

“…(2017) (20) , etc. y con un accesorio de flexión de tres puntos (Resistencia flexural) por Pala K. y col. (2017) (17) , Muñoz I y col. (2013) (21) , Zhang H y col. (2016) (22) , Mohammadi E. y col. (2017) (23) , Warangkulkasemkit S. y col. (2018) (24) , etc. Se utilizó este equipo por sus diversas ventajas, entre ellas por ser confiable ya que cumple con las normas internacionales para cada sistema de ensayo y por tener buena precisión de la medición.…”

“…(26) Estas medidas también han sido referencia para otros estudios sobre resistencia flexural. (17,(21)(22)(23)(24) . Sobre la prueba a la resistencia de compresión, no existe una medida específica o estándar, por lo cual, las medidas varían ampliamente entre diversos autores; tal es el caso de Galvão R. y col. 2013quienes utilizaron muestras de 4x8mm (19) , Narasimha J. y col. (2013) (14) y Warangkulkasemkit S. y col (2018) emplearon muestras de 6x4mm (25) , Aleem H. y col.…”

“…Bis-GMA (39) , razón por la cual según Warangkulkasemkit S. y col. (2018) relaciona la presencia de este monómero con el aumento de resistencia a la flexión. (24) La información disponible acerca de la resina Opus Bulk Fil aún resulta escasa; sin embargo, asociamos los resultados obtenidos en este estudio (resistencia a la compresión (141.68±22.20MPa) y resistencia flexural (116.29±7.20MPa) a su novedoso sistema de polimerización: Advanced Polimerization System (APS). Este consiste en la reducción de canforoquinonas y adicion de otros fotoiniciadores especiales para lograr así un mejor fotocurado a mayor profundidad, mejor estética y mejores propiedades mecánicas.…”