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.
Cite this paper
I. M. Hamouda and H. Abd Elkader, "Evaluation the Mechanical Properties of Nanofilled Composite Resin Restorative Material," Journal of Biomaterials and Nanobiotechnology, Vol. 3 No. 2, 2012, pp. 238-242. doi: 10.4236/jbnb.2012.32029.
 J. Mahart and R. Hickel “Esthetic Compomer Restorations in Posterior Teeth Using a New All-in-One Adhesives,” Journal of Esthetic and Restorative Dentistry, Vol. 11, No. 5, 1999, pp. 250-258.
 J. F. Roulet, “The Problems Associated with Substituting Composite Resins for Amalgam: A Status Report on Posterior Composites,” Journal of Dentistry, Vol. 6, No. 3, 1988, pp. 101-103. doi:10.1016/0300-5712(88)90001-2
 W. B. Wayne, A. L. Mark, L. E. Robert and L. Paul, “Comparison of Laboratory and Clinical Wear Rates of Resin Composites,” Quintessence International, Vol. 35, No. 4, 2004, pp. 269-274.
 S. C. Bayne, H. O. Heymann and E. J. Swift, “Update on Dental Composite Restoration,” Journal of the American Dental Association, Vol. 125, No. 6, 1994, pp. 687-701.
 N. Attar, “Effect of Finishing and Polishing Procedures on the Surface Roughness of Composite Resin Materials,” Journal of Contemporary Dental Practice, Vol. 8, No. 1, 2007, pp. 27-35.
 J. Mahart, H. Y. Chen and R. Hickel, “The Suitability of Packable Resin-Based Composites for Posterior Restorations,” Journal of the American Dental Association, Vol. 132, No. 5, 2001, pp. 639-645.
 N. Attar and M. D. Turgut, “Fluoride Release and Uptake Capacities of Fluoride Releasing Restorative Materials,” Operative Dentistry, Vol. 28, No. 4, 2003, pp. 395-402.
 K. F. Leinfelder, “Posterior Composite Resins: The Materials and Their Clinical Performance,” Journal of the American Dental Association, Vol. 126, No. 5, 1995, pp. 663-672.
 3M Dental Products FiltekTM Supreme Universal Restorative System, Technical Product Profile St. Paul MN 55144-1000, 2002.
 D. B. Esteban, Y. Mahrkh and A. C. Angelo, “Fracture Toughness of Nine Flowable Resin Composites,” Journal of Prosthetic Dentistry, Vol. 89, No. 3, 2003, pp. 261-267.
 N. Attar, L. E. Tam and D. McComb, “Flow, Strength, Stiffness and Radiopacity of Flowable Resin Composites,” Journal of the Canadian Dental Association, Vol. 69, No. 8, 2003, pp. 516-521.
 S. Suzuki, K. F. Leinfelder, K. Kawai and Y. Tsuchitani, “Effect of Particle Variation on Wear Rates of Posterior Composites,” American Journal of Dentistry, Vol. 8, No. 4, 1995, pp. 173-178.
 J. R. Condonand and J. L. Ferracane, “In Vitro Wear of Composite with Varied Cure, Filler Level, and Filler Treatment,” Journal of Dental Research, Vol. 76, No. 7, 1997, pp. 1405-1411.
 K. J. S?der-holm, P. Lambrechts, P. Sarrett, Y. Abe, M. C. Yang, R. Labella, E. Yildiz and G. Willems, “Clinical Wear Performance of Eight Experimental Dental Composites over Three Years Determined by Two Measuring Methods,” European Journal of Oral Sciences, Vol. 109, No. 4, 2001, pp. 273-281.
 G. Willems, P. Lambrechts, M. Braem and G. Vanherle, “Composite Resins in the 21st Century,” Quintessence International, Vol. 24, No. 6, 1993, pp. 641-658.
 K. D. J?gensen and E. Asmussen, “Occlusal Abrasion of a Composite Restorative Resin with Ultra-Fine Filler,” Quintessence International, Vol. 9, No. 6, 1978, pp. 73-78.
 K. J. S?derholm and S. W. Shang, “Molecular Orientation of Silane at the Surface of Colloidal Silica,” Journal of Dental Research, Vol. 72, No. 6, 1993, pp. 1050-1054.
 R. M. Pilliar, R. Vowles and D. F. Williams, “The Effect of Environmental Aging on the Fracture Toughness of Dental Composites,” Journal of Dental Research, Vol. 66, No. 3, 1987, pp. 722-726.
 J. Spanoudakis and R. J. Young, “Crack Propagation in a Glass Particle-Filled Epoxy Resin Part 1 Effect of Particle Volume Fraction and Size,” Journal of Materials Science, Vol. 19, No. 2, 1984, pp. 473-486.
 R. J. Young and P. W. R. Beaumont, “Failure of Brittle Polymers by Slow Crack Growth Part 2 Failure Processes in a Silica Particle-Filled Epoxy Resin Composite,” Journal of Materials Science, Vol. 10, No. 8, 1975, pp. 1343-1350. doi:10.1007/BF00540824
 K. H. Kim, J. H. Park, Y. Imai and T. Kishi, “Fracture Toughness and Acoustic Emission Behavior of Dental Composite Resins,” Engineering Fracture Mechanics, Vol. 40, No. 4-5, 1991, pp. 811-819.
 J. L. Ferracane and V. A. Marker, “Solvent Degradation and Reduced Fracture Toughness in Aged Composites,” Journal of Dental Research, Vol. 71, No. 1, 1992, pp. 13-19. doi:10.1177/00220345920710010101
 S. B. Mitra and N. Brain, “An Application of Nanotechnology in Advanced Dental Materials,” Journal of the Canadian Dental Association, Vol. 134, No. 10, 2003, pp. 1382-1390
 S. M. Cung, A. U. J. Yab, S. P. Chandra and C. T. Lim, “Flexural Strength of Ental Composite Restoratives: Comparison of Biaxial and Three-Point Ending Test,” Journal of Biomedical Materials Research Part B Applied Biomaterials, Vol. 71, No. 2, 2004, pp. 278-283.
 J. L. Ferracane, “In Vitro Evaluation of Composite Resins: Structure-Property Relations,” Transactions of the Academy of Dental Materials, Vol. 2, 1989, pp. 6-8.