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Water sorption of CH3- and CF3-Bis-GMA based resins with additives
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نویسنده
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prakki a. ,cilli r. ,vieira i.m. ,dudumas k. ,pereira j.c.
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منبع
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journal of applied oral science - 2012 - دوره : 20 - شماره : 4 - صفحه:472 -477
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چکیده
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Objectives: to evaluate the effect of additives on the water sorption characteristics of bis-gma based copolymers and composites containing tegdma,ch3bis-gma or cf3bis-gma. material and methods: fifteen experimental copolymers and corresponding composites were prepared combining bis-gma and tegdma,ch3bis-gma or cf3bis-gma,with aldehyde or diketone (24 and 32 mol%) totaling 30 groups. for composites,barium aluminosilicate glass and pyrogenic silica was added to comonomer mixtures. photopolymerization was effected by 0.2 wt% each of camphorquinone and n,n-dimethyl-p-toluidine. specimen densities in dry and water saturated conditions were obtained by archimedes' method. water sorption and desorption were evaluated in a desorption-sorption-desorption cycle. water uptake (%wu),water desorption (%wd),equilibrium solubility (es; μg/mm3),swelling (f) and volume increase (%v) were calculated using appropriate equations. results: all resins with additives had increased %wu and es. tegdma-containing systems presented higher %wu,%wd,es,f and %v values,followed by resins based on ch3bis-gma and cf3bis-gma. conclusions: aldehyde and diketone led to increases in the water sorption characteristics of experimental resins.
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کلیدواژه
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Bis-GMA polymer; Composite resins; Polymerization; Solubility; Water storage
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آدرس
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department of clinical sciences,restorative dentistry,faculty of dentistry,university of toronto,124 - edward st,toronto - on - m5g 1g6, Canada, department of dental materials and operative dentistry,faculty of dentistry,university of fortaleza,fortaleza,ce, Brazil, department of restorative dentistry,piracicaba school of dentistry,state university of campinas,piracicaba,sp, Brazil, department of clinical sciences,restorative dentistry,faculty of dentistry,university of toronto,124 - edward st,toronto - on - m5g 1g6,canada,department of human biology,university of toronto,toronto, Canada, department of operative dentistry,endodontics and dental materials,bauru school of dentistry,university of são paulo,bauru,sp, Brazil
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Authors
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