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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18268

Title: Biodegradation of Polyacid Modified Composite Resins by Human Salivary Esterases
Authors: Daniel, Iris
Advisor: Finer, Yoav
Department: Dentistry
Keywords: Biodegradation
Salivary enzymes
Issue Date: 13-Jan-2010
Abstract: Polyacid modified composite resins (PMCR) are designed to combine the aesthetics of composites-resins with the fluoride release of glass-ionomers. Objectives: to compare the relative biostability and fluoride release of PMCR (F2000 [3M]; Dyract eXtra [DENTSPLY]) and a composite-resin (Z250 [3M]). Standardized samples were incubated in either buffer or human saliva derived esterases (HSDE) for up to 14 days. High- performance-liquid-chromatography revealed higher amounts of degradation products for all HSDE incubated groups, as compared with the buffer. Z250 samples released higher amounts of bishydroxypropoxyphenylpropane (Bis-HPPP) and triethylene-glycol-dimethacrylate (TEGDMA) than both PMCR. Dyract eXtra and F2000 samples released unique degradation products, respectively di-ester of 2-hydroxyethyl di-methacrylate with butane tetracarboxylic acid (TCB) and glyceryl dimethacrylate (GDMA). F2000 samples released more fluoride for both incubation periods in the presence of HSDE as compared with Dyract eXtra samples. Scanning electron microscopy analysis confirmed the greater degradation of both PMCR, as compared with Z250.
URI: http://hdl.handle.net/1807/18268
Appears in Collections:Master
Faculty of Dentistry - Master theses

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