Original article
English
Garoushi S, Vallittu PK, Lassila LV.
Department of Prosthetic Dentistry & Biomaterials Science, Institute of Dentistry, University of Turku, Lemminkنisenkatu 2, FI-20520 Turku, Finland.
Dent Mater. 2007 Nov;23(11):1356-62.
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 22.5wt% and IPN-resin 22.5wt% with silane treated silica filler 55wt% using high speed mixing machine. Test specimens (2mmx2mmx25mm) and (9.5mmx5.5mmx3mm) 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 (ط3.0mm) 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 (210MPa) and compressive load-bearing capacity (1881N) (p<0.05) than control composite (111MPa, 1031N). 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. Keywords: Restorative composite; Water sorption; Fiber reinforce composite; Mechanical properties; Degree of conversion Link/DOI: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VP3-4MR7D92-2&_user=10&_coverDate=11%2F30%2F2007&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=3a62531dc678b6fabfb4a19e01e3274a