title: Effect of silanization of hydroxyapatite fillers on physical and mechanical properties of a bis-GMA based resin composite.
abstract: To evaluate the physical and mechanical properties of an experimental bis-GMA-based resin composite incorporated with non-silanized and silanized nano-hydroxyapatite (nHAP) fillers. Experimental bis-GMA based resin composites samples which were reinforced with nHAP fillers were prepared. Filler particles were surface treated with a silane coupling agent. Five test groups were prepared: 1. Unfilled, 2. Reinforced with 10wt% and 30wt% non-silanized nHAP fillers, and 3. Reinforced with 10wt% and 30wt% silanized nHAP fillers. The samples were subjected to tests in dry condition and in deionized water, aged at 37°C for 30 days. Prepared silanized and non-silanized nHAP were analyzed with Fourier Transform Infrared (FTIR) Spectroscopy and X-ray Photoelectron Spectroscopy (XPS). The micro-hardness and water sorption were evaluated. Data were analyzed by one-way ANOVA (p<0.05). The samples were characterized by FTIR Spectroscopy, Thermogravimetric Analysis and Differential Scanning Calorimetry. The surface morphology of sample surfaces was examined by Scanning Electron Microscope (SEM). The results showed that the water sorption for nHAP fillers reinforced resins was significantly lower than unfilled resins. Surface hardness for resins reinforced with silane treated fillers was superior to unfilled and untreated fillers resins. The resin matrix loaded with 30wt% silanized-nHAP fillers would improve the physical and mechanical properties of a bis-GMA based resin.
authors.affiliation: Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, PR China. Electronic address: cyklung@hku.hk.
authors.forename: Christie Ying Kei
authors.initials: CY
authors.lastname: Lung
authors.affiliation: Interdisciplinary Research Centre in Biomedical Materials, COMSATS Institute of Information Technology, Lahore, Pakistan.
authors.forename: Zenab
authors.initials: Z
authors.lastname: Sarfraz
authors.affiliation: School of Chemical and Materials Engineering, National University of Sciences and Technology, Islamabad, Pakistan.
authors.forename: Amir
authors.initials: A
authors.lastname: Habib
authors.affiliation: Interdisciplinary Research Centre in Biomedical Materials, COMSATS Institute of Information Technology, Lahore, Pakistan. Electronic address: draskhan@ciitlahore.edu.pk.
authors.forename: Abdul Samad
authors.initials: AS
authors.lastname: Khan
authors.affiliation: Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, PR China. Electronic address: jpmat@hku.hk.
authors.forename: Jukka Pekka
authors.initials: JP
authors.lastname: Matinlinna
mesh_terms: D000327:Adsorption; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D006244:Hardness; D055595:Mechanical Phenomena; D055585:Physical Phenomena; D012117:Resins, Synthetic / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D012117:Resins, Synthetic; D012821:Silanes; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; D017886:Durapatite
keywords: Dental resin; Mechanical properties; Nano-hydroxyapattite; Physical; Silanization