fa بررسی اثر اکسید گرافن بر استحکام خمشی، الاستیک مدولوس و ریزسختی پلی اتیل متاکریلات پروتز Prothesis مطالعه اصیل original article <h5 dir="RTL" style="text-align:justify"><span style="font-size:12pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><span style="font-weight:normal"><span b="" lang="AR-SA" nazanin="" style="font-family:"><span style="color:black">خلاصه: </span></span>&nbsp;<span b="" lang="AR-SA" nazanin="" style="font-family:"><span style="color:black"></span></span></span></span></span></span></span></span></span></span></h5> <h5 dir="RTL" style="text-align:justify"><span style="font-size:9pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b>&nbsp;</b><b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">سابقه و هدف:</span></span></span></span></b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> گرافن، نانو ساختاری دو بعدی شامل تک لایه ای از اتم های کربن </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">SP2</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> است که با پیوند کوالانسی در یک شبکه ی زنبوری هگزاگونال مرتب شده اند. تقویت ایجاد شده توسط اکسید گرافن </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">(GO)</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> به علت وجود گروه های فانکشنال می باشد که منجر به بر هم کنش های مستحکم تر، پراکندگی و انتقال بهتر استرس می شود. به علت ویژگی های مکانیکی و استحکام پایین تر </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">PEMA</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> نسبت به </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">PMMA</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">، تاثیر </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">GO</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> را در مقادیر مختلف بر ویژگی های مکانیکی</span></span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">پلی اتیل متا کریلات</span></span></span></span> <span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">(</span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">PEMA</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">) بررسی کردیم.</span></span></span></span></span></span></span></span></span></span></span><br> <span style="font-size:9pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">مواد و روش ها</span></span></span></span></b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">: در این مطالعه تجربی-آزمایشگاهی، </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">30</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> نمونه آکریلی با&nbsp; ابعاد 2(عرض)&times;2(ارتفاع)&times;25 </span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">میلی متر </span></span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">در سه گروه </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">PEMA</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> فاقد</span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">GO </span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">،&nbsp; 0/25&nbsp; و 0/5 درصد وزنی</span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">GO</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">، </span></span></span></span>&nbsp;<span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">از نظر استحکام خمشی، الاستیک مدولوس و میکروهاردنس نوپ و نیز </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">SEM</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> مورد ارزیابی قرار گرفتند.</span></span></span></span></span></span></span></span></span></span></span><br> <span style="font-size:9pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">یافته ها</span></span></span></span></b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">: بیشترین میانگین میکروهاردنس نوپ مربوط به گروه 0.25%</span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">wt GO</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> (</span></span></span></span><span lang="FA" style="font-size:14.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">4390/24 </span></span></span></span><span dir="LTR" lang="X-NONE" style="font-size:14.0pt"><span style="line-height:115%"><span style="color:black">kg_f.mm^-2</span></span></span><span lang="FA" style="font-size:14.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> ) </span></span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">و کمترین میزان مربوط به گروه&nbsp; 0/5%</span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">wt GO</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> (</span></span></span></span><span lang="FA" style="font-size:14.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">8377/15 </span></span></span></span><span dir="LTR" lang="X-NONE" style="font-size:14.0pt"><span style="line-height:115%"><span style="color:black">kg_f.mm^-2</span></span></span>^{<span lang="FA" style="font-size:14.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> ) </span></span></span></span>}<span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">بود. میانگین استحکام خمشی و الاستیک مدولوس گروه کنترل بیشتر بود.</span></span></span></span></span></span></span></span></span></span></span><br> <span style="font-size:9pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">نتیجه گیری</span></span></span></span></b><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black">: افزودن </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">GO</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> به </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">PEMA</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> در غلظت های پایین، به صورت معنی داری می تواند منجر به افزایش میکروهاردنس شود و به این ترتیب میتوان استفاده از </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">GO</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> را برای بهبود ویژگی مکانیکی ماده ی </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">PEMA</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> توصیه نمود. افزودن </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">GO</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> موجب افزایش الاستیک مدولوس و استحکام خمشی </span></span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:black">PEMA</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"><span style="color:black"> نشد.</span></span></span></span></span></span></span></span></span></span></span><br> &nbsp;</h5> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b>Background and Aim:</b> <span style="font-size:10.0pt">graphene is a two-dimensional nanostructure consist of a single layer of SP2 carbon atoms that arranged by covalent bonds in a hexagonal bee web. The reinforcement by GO is due to functional groups that lead to strong interaction, dispersion and stress distribution. Due to lower mechanical properties and strength of PEMA than PMMA, we evaluate effect of GO on mechanical properties of PEMA.</span><span dir="RTL" lang="AR-SA" style="font-size:10.0pt"><span style="font-family:"B Nazanin""></span></span></span></span><br> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b>Materials and methods:</b> <span style="font-size:10.0pt">In this invitro-exprimental study, flexural strength, elastic modulus, Knoop micro hardness and SEM examination of 30 acrylic sample with dimensions 2(width)&times;2(height)&times;2(length) in 3 groups was evaluated. </span><span dir="RTL" lang="AR-SA" style="font-size:10.0pt"><span style="font-family:"B Nazanin""></span></span></span></span><br> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b>Results:</b> <span lang="EN" style="font-size:10.0pt">The maximum mean Knoop micro hardness was related to 0.25%wt GO and the lowest value was related to 0.5%wt GO groups. The mean flexural strength and modulus of elasticity of the control group were higher. </span><span dir="RTL" lang="FA" style="font-size:10.0pt"><span style="font-family:"Calibri","sans-serif""></span></span></span></span><br> <span style="font-size:12pt"><span new="" roman="" style="font-family:" times=""><b>Conclusion:</b> <span style="font-size:10.0pt">GO can increase micro hardness of PEMA in low value, thus the use of GO can be recommended to improve mechanical properties of PEMA. GO did not increase elastic modulus and flexural strength. <b><i></i></b></span></span></span><br> &nbsp; اکسید گرافن, پلی اتیل متاکریلات, استحکام خمشی, میکروهاردنس نوپ, الاستیک مدولوس Graphene oxide, Poly ethyl methacrylate, Flexural strength, Elastic modulus, Knoop micro hardness. 119 130 http://jrds.ir/browse.php?a_code=A-10-1662-1&slc_lang=fa&sid=1 مهناز حاتمی 100319475328460019303 100319475328460019303 Yes بخش پروتز های دندانی دانشگاه علوم پزشکی دانشگاه شهید صدوقی یزد عباس فلاح تفتی 100319475328460019304 100319475328460019304 No بخش پروتز های دندانی دانشگاه علوم پزشکی دانشگاه شهید صدوقی یزد سولماز قنبرنژاد 100319475328460019305 100319475328460019305 No دانشکده مهندسی مواد دانشگاه آزاد اسلامی تهران معصومه باقری masoumehbagheri88@gmail.com 100319475328460019306 100319475328460019306 No بخش پروتز های دندانی دانشگاه علوم پزشکی دانشگاه شهید صدوقی یزد