IADR Abstract Archives
Physicochemical Properties of Discontinuous S2-glass Fiber Reinforced Dental Composite
Objectives: The objective of this study was to investigate several physicochemical properties of an experimental discontinuous S2-glass fiber-reinforced dental composite.
Methods: Experimental S2-glass fiber-reinforced composite was prepared by mixing 10wt% of discontinuous S2-glass fibers (365 S-2 GlassR Roving, AGY, South Carolina, USA), manually cut into 2mm, with 27.5wt% of dimethacrylate based resin matrix and 50wt% of silane treated particulate fillers. Flexural strength, flexural modulus, work of fracture, fracture toughness, double bond conversion, volume shrinkage and fiber length distribution were determined. These were compared with a particulate filler composite Z250 (shade A2) (3M ESPE, St. Paul, MN, USA) and a short E-glass fiber-reinforced composite everX Posterior (GC, Tokyo, Japan).
Results: Experimental composite showed the highest flexural strength (189.4±17.6MPa), work of fracture (6.1±1.0KJ/m2) and fracture toughness (5.9±0.6MPam1/2) compared with two control composites (p＜0.05). Experimental composite showed increased load-bearing ability and strain compared with two controls. Experimental composite (65.0±1.2%) and Z250 (62.7±1.7%) had comparable DCs (p＞0.05), which were significantly higher than DC of everX Posterior (57.8±1.6%) (p＜0.05). No significant difference was observed in volume shrinkage between three tested composites (p＞0.05). More than 80wt% of the fibers in experimental composite were longer than the critical fiber length 0.5mm. While less than 50wt% of the fibers in everX Posterior were longer than the critical fiber length 0.85mm. The mean aspect ratio of fibers in experimental composite and everX Posterior was 72 and 32, respectively.
Conclusions: In conclusion, the use of discontinuous S2-glas fiber fillers with polymer matrix and particulate fillers yielded improved mechanical performance compared to commercial E-glass fiber-reinforced composite and conventional posterior composite.
Methods: Experimental S2-glass fiber-reinforced composite was prepared by mixing 10wt% of discontinuous S2-glass fibers (365 S-2 GlassR Roving, AGY, South Carolina, USA), manually cut into 2mm, with 27.5wt% of dimethacrylate based resin matrix and 50wt% of silane treated particulate fillers. Flexural strength, flexural modulus, work of fracture, fracture toughness, double bond conversion, volume shrinkage and fiber length distribution were determined. These were compared with a particulate filler composite Z250 (shade A2) (3M ESPE, St. Paul, MN, USA) and a short E-glass fiber-reinforced composite everX Posterior (GC, Tokyo, Japan).
Results: Experimental composite showed the highest flexural strength (189.4±17.6MPa), work of fracture (6.1±1.0KJ/m2) and fracture toughness (5.9±0.6MPam1/2) compared with two control composites (p＜0.05). Experimental composite showed increased load-bearing ability and strain compared with two controls. Experimental composite (65.0±1.2%) and Z250 (62.7±1.7%) had comparable DCs (p＞0.05), which were significantly higher than DC of everX Posterior (57.8±1.6%) (p＜0.05). No significant difference was observed in volume shrinkage between three tested composites (p＞0.05). More than 80wt% of the fibers in experimental composite were longer than the critical fiber length 0.5mm. While less than 50wt% of the fibers in everX Posterior were longer than the critical fiber length 0.85mm. The mean aspect ratio of fibers in experimental composite and everX Posterior was 72 and 32, respectively.
Conclusions: In conclusion, the use of discontinuous S2-glas fiber fillers with polymer matrix and particulate fillers yielded improved mechanical performance compared to commercial E-glass fiber-reinforced composite and conventional posterior composite.