Abstract
This study was designed to evaluate the wear resistance, fracture toughness and flexural strength of a nanofilled composite resin restorative material in comparison with a conventional hybrid composite resin. A total of 60 specimens were prepared from both types composite resins. Specimens were cured with a light curing device according to the manufacturer’s instructions. Wear resistance was evaluated through subjecting the specimens to wear testing at 0.1 bar wet pressure against carbide abrasive counter-body using wear testing machine under water as lubricant. The test conditions were; speed = 265 rpm, load = 0.1 bar, time = 5 min. Flexural strength and fracture toughness were tested using three-point bending test in universal testing machine at a cross head speed of 2 mm/min until failure occurred. The nanofilled composite resin material exhibited higher wear resistance than the hybrid composite resin material. On the other hand, there were no significant differences between the two materials in values of flexural strength and fracture toughness. It was concluded that the nanofilled composite resin was harder but it does not stronger than the conventional hybrid composite resin.
Highlights
Resin composites are increasingly used for restorative purposes because of good esthetic and the capability of establishing a bond to enamel and dentin
Composite resin materials have progressed from macrofills to microfills and from hybrids to microhybrids, and new materials such as packable and nanofilled composites have been introduced to the dental market [5,6,7]
The t-test demonstrated no significant difference between the mean fracture toughness of nanofilled composite (Filtek Supreme) and hybrid composite (Prime-Dent) (P > 0.05)
Summary
Resin composites are increasingly used for restorative purposes because of good esthetic and the capability of establishing a bond to enamel and dentin. Improvements of mechanical properties of the composite have permitted its use in posterior teeth with greater reliability than was the case some years ago. This improvement included; development of smaller particle sizes of filler, better bonding systems, curing refinements and sealing systems [4]. Nanofilled composite was mentioned in early 1990s but the first commercial product (Filtek Supreme, 3M-ESPE) was launched in late 2002 [4] This investigation was designed to evaluate the mechanical properties of nanofilled composite resin in comparison with the conventional hybrid composite resin regarding the wear resistance, fracture toughness and flexural strength
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