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  • Title: Short glass fiber reinforced restorative composite resin with semi-inter penetrating polymer network matrix.
    Author: Garoushi S, Vallittu PK, Lassila LV.
    Journal: Dent Mater; 2007 Nov; 23(11):1356-62. PubMed ID: 17204319.
    Abstract:
    OBJECTIVES: The purpose of this study was to investigate the reinforcing effect of short E-glass fiber fillers on some mechanical properties of dental composite resin with interpenetrating polymer network (IPN)-polymer matrix. MATERIALS AND METHODS: Experimental composite resin was prepared by mixing short fibers (3mm in length) with a fraction of 22.5 wt% and IPN-resin 22.5 wt% with silane treated silica filler 55 wt% using high speed mixing machine. Test specimens (2 mm x 2 mm x 25 mm) and (9.5 mm x 5.5 mm x 3 mm) were made from the experimental composite (FC) and conventional particulate composite resin (control, Z250, 3M-ESPE). The test specimens (n=6) were either dry stored or water stored (37 degrees C for 30 days) before the mechanical tests. Three-point bending test was carried out according to ISO 10477 and compression loading test was carried out using a steel ball (Ø3.0mm) with speed of 1.0mm/min until fracture. Degree of monomer conversion (DC%) of both composites was determined by FTIR spectrometry. Water sorption and solubility of specimens were also measured. Scanning electron microscopy was used to evaluate the microstructure of the composite. RESULTS: ANOVA revealed that experimental fiber composite had statistically significantly higher mechanical performance of flexural strength (210 MPa) and compressive load-bearing capacity (1881 N) (p < 0.05) than control composite (111 MPa, 1031 N). Degree of conversion of the FC (59%) and conventional composite (57%) was at the same range. SIGNIFICANCE: The use of short fiber fillers with IPN-polymer matrix yielded improved mechanical performance compared to conventional restorative composite.
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