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Evaluation the effect of modified nano-fillers addition on some properties of heat cured acrylic denture base material | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 23, Issue 3, 2011, Pages 23-29 | ||
| Authors | ||
| ; Ihab NS | ||
| Abstract | ||
| ABSTRACTBackground: The poly(methylmethacrylate) (PMMA) shown to be lacking two properties which are strength andradio-opacity. The aim of this study was to evaluate the effect of addition of modified nano-zirconium oxide (ZrO2)onsome properties of heat cured acrylic denture base material .Material and method: (ZrO2) nanofillers were incorporated into (PMMA) denture base by free radical bulkpolymerization. (PMMA) nanoparticales were coated with a layer of trimethoxysilypropylmethacrylate (TMSPM)before dispersed and sonicated in monomer (MMA) in different percentages 2%, 3%, 5% and 7% by weight. Thenmixed with acrylic powder as general conventional method. Two hundred fifty five (255) specimens were preparedfor this study they were divided into (6) groups according to the test used. The tests were impact strength,indentation hardness, surface roughness, transverse strength, radio-opacity and microscope test, for each test fivesubgroups (one control and four for nano-ZrO2). The size and shape distribution of nano-ZrO2 particles wereestimated using scanning electron microscope (SEM) and atomic force microscope (AFM) .Result: Highly significant increase in impact and transverse strength occur in acrylic reinforced with 5wt%, but nonsignificant increase was observed at 7wt% when compared to control group. Non-significant increases in indentationhardness and surface roughness appear with addition of modified nano-ZrO2 at different percentages. For radioopacitya highly significant increase had occurred with the addition of modified nano-ZrO2.Conclusion: The maximum increase in impact strength, transverse strength and radio-opacity was observed indenture base nano composite containing 5wt% of nano-ZrO2.Key words: poly (methylmethacrylate), nano composite. (J Bagh Coll Dentistry 2011;23(3): 23-29). | ||
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