Abstract
As a core build-up material, dual-cured (DC) resin-based composites are becoming popular. The aim of this research was to investigate specific physical and handling properties of new experimental short-fiber-reinforced DC resin composites (SFRCs) in comparison to different commercial, conventional DC materials (e.g., Gradia Core, Rebilda DC, LuxaCore Z, and Visalys® CemCore). Degree of monomer conversion (DC%) was determined by FTIR-spectrometry using either self- or light-curing mode. The flexural strength, modulus, and fracture toughness were calculated through a three-point bending setup. Viscosity was analyzed at room (22 °C) and mouth (35 °C) temperatures with a rotating disk rheometer. The surface microstructure of each resin composite was examined with scanning electron microscopy (SEM). Data were statistically analyzed with analysis of variance ANOVA (p = 0.05). The curing mode showed significant (p < 0.05) effect on the DC% and flexural properties of tested DC resin composites and differences were material dependent. SFRC exhibited the highest fracture toughness (2.3 MPa m1/2) values and LuxaCore showed the lowest values (1 MPa m1/2) among the tested materials (p < 0.05). After light curing, Gradia Core and SFRCs showed the highest flexural properties (p < 0.05), while the other resin composites had comparable values. The novel DC short-fiber-reinforced core build-up resin composite demonstrated super fracture toughness compared to the tested DC conventional resin composites.
Highlights
As a consequence, of the improvement of adhesive dentistry, restoring strategies of severely damaged teeth have altered dramatically in recent years [1]
The use of prefabricated fiber posts is recommended only in cases of severe loss of remaining coronal tooth structure to assist the retention of the final restoration and possibly to optimize the biomechanical behavior of the remaining tooth structure [5]
The light-cure protocol always resulted in a significant improvement in flexural properties, regardless of the type of material
Summary
Of the improvement of adhesive dentistry, restoring strategies of severely damaged teeth have altered dramatically in recent years [1]. A popular biomimetic restorative technique recommends replacing enamel with glass or hybrid ceramic and dentine with conventional particulate filled composite or short-fiber-reinforced composite (SFRC) [3]. The use of prefabricated fiber posts is recommended only in cases of severe loss of remaining coronal tooth structure to assist the retention of the final restoration and possibly to optimize the biomechanical behavior of the remaining tooth structure [5]. The mechanical properties of these resin cements are less than those of dentine and posts, which might result in an area of high stress, especially when a thick layer of cement is present in a wide or flared canal, resulting in multiple crack formations and inadequate bonding [6]. With the present particulate filler containing luting cement, a restored tooth is not optimized from a biomechanical point of view
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