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Natural fibers have recently become attractive to researchers due to their low cost, fairly good mechanical properties, high specific strength, non-abrasive, eco-friendly, bio-degradability and biocompatibility characteristics, they are exploited as a replacement for the conventional fibers, such as glass, aramid and carbon. This study investigated the influence of fiber length and weight fraction of natural siwak fiber, with the selected length of (2, 6 and 12 mm) and weight fraction (3, 6 and 9 wt %), on some of mechanical and physical properties such as (tensile, impact and hardness), in addition to test the infrared spectroscopy FTIR of the prepared denture base resin and all of these tests were carried out at laboratory temperature.The properties of PMMA reinforced by natural fiber are mainly affected by the interfacial adhesion strength between the matrix and the fiber, and in order to improve interconnection between the siwak fiber and PMMA matrix, so the siwak fibers were treated with alkali (sodium hydroxide) solution prior to use as reinforcement materials. The results illustrated that the tensile strength, young modulus, fracture toughness and hardness tended to be improved with length and concentration ratios of siwak fiber, while the impact strength and elongation percentage at break decrease with fiber content in composite samples.
 A. M. El-Sheikh and S. B. Al-Zahrani, "Causes of denture fracture: A survey", Saudi Dental Journal, Vol.18, No.3, (149-154), (2006).
 J. Xu, L.Cong, and Y. Li, "Fabrication and mechanical properties of short sisal fiber reinforced composites used for dental application", 18 the international conference on composite materials.
 O’Brien WJ.,” Dental materials and their selection”, 3rd ed. Chicago:Quintessence Int, pp.(216-20), (2002).
 F. chen, Z. Cheng Wang and C. Jian Lin "Preparation and Characterization of nanosized Hydroxyapatite particles and Hydroxyapatite/ Chitosan nanocomposite for use in Biomedical Materials", Materials Letters Vol.57, PP.(858-861), (2002).
 D. E. Baciu, J. Simitzis, and D. Glannak Opowlos, "Synthesis and Characterization of Acrylic Bone Cement Reinforced with Zirconia Bio ceramic", Digest Journal of Nanomaterials and Bio structures, Vol.7, No.40, PP.(1779-1786), (2012).
 J. K. Oleiwi, and S. J. Ahmed, "Studying the Tensile and Buckling for PMMA Reinforced by Jute Fibers for Prosthetic Pylon", Engineering &Technology Journal, Vol.32, Part (A), No.1, (2016).
 P. Amuthakkannan1, V. Manikandan, J.T. Winowlin Jappes and M. Uthayakumar, "Effect of fiber length and fiber content on mechanical properties of short basalt fiber reinforced polymer matrix composites", Materials Physics and Mechanics, Vol.16, pp.(107-110), (2013).
 M. S. Sreekanth, V. A. Bambole, S. T. Mhaske, P. A. Mahanwar, "Effect of concentration of Mica on Properties of Polyester Thermoplastic Elastomer Composites" , Journal of Min. and Mat. Character. and Eng.,Vol.8, No.4, PP.(271-282), (2009).
 S. H. Sawalha, A. Mosleh, A. D. Manasrah, "Tensile Properties of Extruded Short Glass Fiber/Low Density Polyethylene Composites", Iranian Polymer Journal, Vol.16, No.10, PP.(719-726), (2007).
 W. D. Callister, Jr., and D. G. Rethwisch, "Fundamentals of Materials Science and Engineering", 5th edition, John Wiley & Sons Inc., (2001).
 S. C. George1, T. Jose, et.al, "Mechanical Properties of Short Sisal Fiber Reinforced Pheno Formaldehyde Eco-Friendly Composites", Polymers from Renewable Resources, Vol.8, No.1, PP.(27), (2017).
 Ö. Karacaer, T. Polat, et.al, ”The effect of length and concentration of glass fibers on the mechanical properties of an injection- and a compression- molded denture base polymer”, Journal of Prosthetic Dentistry, Vol.90, No.4, pp.(385-9),(2003).