@Article{, title={A surface Hardness Estimation of Flexible Acrylic Resin After Glass Fiber Addition تقدير صلابة السطح للاكريليك الراتنجي المرن بعد اضافة شعيرات الزجاج}, author={Israa Mohammed Hummudi اسراء محمد حمودي and Zaid Ezzat Abdulajeed زيد عزت عبدالمجيد}, journal={Al-Nisour Journal for Medical Sciences مجلة النسور للعلوم الطبية}, volume={1}, number={2}, pages={356-365}, year={2019}, abstract={Background: Poly methyl methacrylate (PMMA) is commonly used to fabricate removable denture. The development of polymer chemistry produce alternative materials to PMMA such as polyamides (nylon), acetyl resins, epoxy resins …. etc. All these resins are suited for thermoplastic processing; the flexibility of polyamide allows partial dentures be pressed in one piece including clasps. Glass fiber is the most widely used reinforcing material and account or almost 90% of the reinforcement in resins. The addition of fiber to provisional restorative resin increases tensile strength, fracture toughness and surface hardness.Objective of the study: Evaluation to improve mechanical property of surface hardness of flexible denture bases by addition of glass fibers and alteration of powder –liquid ratio. Material and Methods: Forty samples of flexible acrylic were prepared for hardness test and divided into four groups according to fiber addition and alteration in powder-monomer ratio as follows: group (A) consist of (10 specimens) without addition of fiber glass and ratio (3.1 powder- monomer ratio). Group (B) consist of (10 specimens) with addition of fiber glass with (3.1 powder- monomer ratio), group (C) consist of (10 specimens) without addition of fiber glass with (2.5:1 powder- monomer ratio) and group (D) consist of (10 specimens) with fiber glass with (2.5:1 powder- monomer ratio). Surface hardness of all samples were evaluated by Vickers hardness tester after subjected to the load of 25 gm at 15 sec. Results: The results obtained in the present study showed that significant differences between groups of surface hardness test. Conclusion: Conclusion was derived that flexible acrylic resin had significant effect after fiber addition and alteration in polymer-monomer ratio

ان البولي مثيل ميثا اكريلك هو الاكثر شيوعاً لتصنيع الطقم المتحرك. التطوير في البوليمر كيميائياً انتج مواد بديلة عن بولي مثيل ميثا اكريلك مثل البلاستك البولي مايد (نايلون) راتنجات الاستيل، راتنجات الايبوكسي الى اخره. كل انواع الراتنجات ملائمة للمعالجة حرارياً. ان مرونة البولي مايد يسمح للطقوم جزئياً بان تصمم كونه قطعة واحدة متضمنة الكلاب. الشعيرات الزجاجية هي الاكثر استعمالاً كمادة تعزيزية تقريباً (90%) من التعزيز للراتنجات. ان اضافة الشعيرات للتعويضية الراتنجية تزيد من المرونة، الشد، مقامة الكسر والصلابة.} }