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Article
Evaluation the Effect of Addition of Plasma Treated Polypropylene Fiber and Silanized Silicon Dioxide Nanoparticles Composite on Some Properties of Heat-Polymerized Polymethylmethacrylate

Authors: Ahmed G. Ahmed احمد غيث احمد --- Intisar J. Ismail انتصار جميل اسماعيل
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 1-8
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Polymethylmethacrylate (PMMA) is the most commonly used material in denture construction. This material is far from ideal in fulfilling the mechanical requirements, like low impact and transverse strength and poor thermal conductivity are present in this material.The purpose of this study was to study the effect of addition a composite which include 1%wt silanized silicone dioxide nano fillers (SiO2) and 1wt% oxygen plasma treated polypropylene fiber (PP) on some properties of heat cured acrylic resin denture base material (PMMA).Materials and methods: One hundred (100) prepared specimens were divided into five groups according to the tests, each group consisted of 20 specimens and these were subdivided into two groups (unreinforced heat cured acrylic resin as control group)and reinforced acrylic resin with ( 1%wt Nano SiO2 and 1% wt oxygen plasma treated polypropylene fibers) group. The transverse strength¸ impact strength, indentation hardness (shoreD), surface roughness and water sorption and solubility were investigated. The results were statistically analyzed using descriptive and t-test.Results: The results of this study show that a highly significant increase in impact strength (10.4939 Kj/m2),surface hardness (89.9375) surface roughness (0.9498) and water sorption (0.0171mg/cm2) was observed with the addition of 1%wt silanized (SiO2) nanoparticles and 1%wt oxygen plasma treated polypropylene fibers to (PMMA) , also significant decrease in transverse strength (103.4753 N/mm2), nonsignificant decrease occurred in water solubility which was (0.0005mg/cm2).Conclusion: The incorporation of 1%wt silanized SiO2 nanoparticles and 1%wt oxygen plasma treated polypropylene fiber to heat cure PMMA form a composite improves the impact strength, surface hardness and surface roughness of acrylic resin, at the same time this addition increase the water sorption and decrease water solubility; while significant decrease in transverse strength


Article
The effect of Silicon di oxide Nano -Fillers reinforcement on some properties of heat cure polymethyl methacrylate denture base material

Authors: Hasanen A. Alnamel --- Mohammed Mudhaffer محمد مظفر
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 1 Pages: 32-36
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The purpose of this study was to evaluate the effect of addition of surface treated silicon dioxide Nano filler (SiO2) on some properties of heat cured acrylic resin denture base material (PMMA). The properties were impact strength, transvers strength, and surface hardness.Materials and methods: In addition to controlled group SiO2 powder was added to PMMA powder by weight in three different percentages 3%, 5% and 7%, mixed by probe ultra-sonication machine.120 specimens were constructed and divided into 3 groups according to the test (each group consist of 40 specimens) and each group was subdivided into 4 sub-groups according to the percentage of added SiO2 (finally each subgroup consist of 10 specimens). The tests conducted were impact strength (charpy test), transverse strength and indentation hardness (shore D).Results: A highly significant increase in impact strength and transverse strength was observed with the addition of SiO2 powder to (PMMA) at the percentage of 3% and 5%; while a significant reduction occurred in both impact and transverse strength specimen’s tests at the percentage of 7% A Highly significant increase in surface hardness was observed at the percentage of 3%, 5%and7.Conclusion: The addition of Nano SiO2 powder to acrylic resin improves the impact strength and transverse strength of acrylic resin at the same time this addition increase surface hardness with the increase in the concentration of Nano SiO2 particles


Article
The Influence of Immersion in Different Chemical Solutions on the Mechanical and Physical properties of (Epoxy/Styrene-Butadiene Rubber) Blend Reinforced with Nano Copper Oxide

Author: Rana M. Salih
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 2 Part (B) Engineering Pages: 104-109
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The aim of this work was to evaluate some mechanical and physicalproperties of a composite material which consists of (epoxy/styrene-butadienerubber) blend as a matrix, reinforced with copper oxide (CuO) with a weightfraction 3%, and the composite material was manufactured by hand lay-up.The optimum mixing ratio was (75:25) % of epoxy and (SBR) was chosen toaccomplish the work due to its highest impact strength (2.1KJ/m2). The teststhat were performed on the material were: tensile test, impact test, thermalconductivity test, and the absorption test, in addition to the microscopicimaging using scanning electron microscope (SEM), to determine the surfacemorphology of the specimens. Sodium hydroxide (NaOH) and hydrochloricacid (HCl), both (0.1) normal concentration solutions, were used for theimmersion. The results showed that CuO nanofiller improved tensile andimpact properties of the blend, besides increasing resistance to diffusion ofchemicals into the material. The results showed that the immersion in HClsolution increased the impact strength of the composite from (2.27KJ/m2) to(3.38KJ/m2), and also increased the tensile strength from (9.2MPa) to (9.8MPa), while immersion in NaOH solution decreased the tensile strength to(7.3MPa), but increased the impact strength to (2.42KJ/m2). Thermalconductivity was (0.21W/m.°C) before immersion in solutions, but changed to(0.27W/m.°C) and (0.24W/m.°C) after immersion in HCl and NaOHrespectively. The weight gain after immersion in NaOH was higher than weightgain after immersion in HCl.


Article
Altering Water Effect and Surface Properties of Heat Cured Poly Methyl Methacrylate by Adding Surface Treated Titanium Di Oxide Nano Particles

Author: Hasanen A. Alnamel حسنين علي النمل
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2019 Volume: 7 Issue: 1 Pages: 1-10
Publisher: Tikrit University جامعة تكريت

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Abstract

Titanium dioxide (TiO2) is extensively used part of our regular life. It can be observed in various commonly utilized goods & customer imports for instance drugs, plastics, cosmetics, food and paper. Universally, the quantity of titanium oxide manufactured in 2009 was 4.68 million tons for that reason the tenacity of the revision is controlling the amount of change on the denture base physical features such as the heat treatment in denture processing (PMMA)through the implementation of modified outer surface titanium di oxide Nano particles. Its properties are comprised of water solubility, surface roughness, water sorption and surface hardness. The controlled TiO2 powder added to heat cured acrylic material according to the main weight of PMMA in concentration of 3%, 5% and 7%, and then it's mixed regularly by engine of probe ultra-sonication. Titanium oxide Nano fillers were merged in denture based material with the help of more free radical polymerization in bulk. The nanoparticles were surface treated by a layer of trime thoxysilypropylmethacrylate (TMSPM). 120 specimens were created and separated into 3 sample sets affording to the examination (each sample sets consist of 40 samples) and each sample sets were sectioned in four subsets according to the TiO2 added ratio and ultimately containing 10 samples in each subset. The tests which conducted were indentation hardness (shore D), surface roughness properties as well as water sorption and solubility. For each test four of the sub groups (one controlled and three with added Nano TiO2). Important to mention that extremely elevation in surface hardness score and roughness were detected at the ratio of 3%, 5%and7%. Thus escalation of added TiO2 nan-fillers considerably reduced the water solubility and sorption. The accumulation of the powder of TiO2 nanoparticles which have been surface treated to the PMMA acrylic resin thus changing the PMMA properties for example surface rigidity and surface coarseness. In which it’s increased in direct proportional relation with the raise of TiO2 concentration; at the same time addition of surface treated TiO2 Nano particles decrease water sorption and solubility of (PMMA) also in direct proportional relation with the raise of TiO2 concentration.


Article
The Development of Biomimetic Nano CaCO3/ PPBio Composites as Bone Repair Materials- Optimal Thermal Properties Evaluation

Authors: Jenan Sattar Kashan --- Huseein Jameel hussein_jameel@yahoo.com
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2017 Volume: 25 Issue: 5 Pages: 1562-1571
Publisher: Babylon University جامعة بابل

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Abstract

CaCO3/PP biocomposite have been proposed previously as biomaterial for bone repair applications.The effect of filler size and type on thermal parameters and crystallization behaviour have not been tacked thoroughly.. Enumeration search method (ESM) checks all possible combinations of design or processing variables in a bottom-up approach until it finds the global optimum solution for the design or processing conditions. In this paper, the optimum processing conditions for calcium carbonate/PP Nano composites as bone analogue biomaterials is sought. Also the effect of Nano sized Al2O3 on thermal properties and crystallization was studied. Enumeration search method (ESM) by Matlab software, give an indication for optimum processing conditions whose results are commensurate with those of the classical experiments design. Different compositions, compounding pressure, and processing temperatures were used in this work. Composites with 5% Al2O3/20 CaCO3/75PP give the optimum thermal properties and uniform distribution of fillers in polymeric matrix.

تم اقتراح المادة المركبة الحيوية CaCO3/PP سابقا كمادة مرممة للعظم. ان تاثير نوع وحجم المادة المضافة على العوامل الحرارية وسلوك التبلور لم يتم دراستها بشكل تام. طريقة Enumeration search method (ESM)تعطي الاحتمالية لكل الحلول الممكنة والتي تجمع بين متغيرات التصميم والتصنيع والخواص المثلى. في هذا البحث تم تحديد افضل ظروف التصنيع للمادة المركبة المقترحة كمادة مرممة للعظم وكذلك تم دراسة تاثير اضافة الالومينا كمادة مضافة نانوية في الخواص الحرارية وسلوك التبلور. تم استخدام برنامج ماتلاب لاجراء عمليه المفاضلة لاختيار افضل الظروف والتي اعطت نتائج تتوافق مع الطرائق التقليدية في الحسابات. تم دراسة ظروف مختلفة للتصنيع وتراكيز مختلفة في هذا البحث . المادة المركبة الحاوية على 5% Al2O3/20 CaCO3/75PP اعطت افضل خواص حرارية وتوزيع متجانس للمادة المضافة في الارضية البوليمرية.

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