FRACTURE BEHAVIOR OF THE POLYMETHYL METHACRYLATE WITH TWO DIFFERENT CURING PROCESSES | ||||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||||
| Article 46, Volume 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., May 2008, Page 117-127 PDF (436.81 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/amme.2008.39276 | ||||
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| Authors | ||||
| EL-ASSAL A. M.1; AL-DOSARY S.2; SHEHATA M. M.3; BASALAH A. A.2 | ||||
| 1Benha University. | ||||
| 2King Abdulaziz University. | ||||
| 3Tanta University. | ||||
| Abstract | ||||
| ABSTRACT The usage of Polymers in different fields is enormous and crucial. Polymethyl Methacrylate (PMMA) is one of the earliest widely used polymers, and well known around the world by a variety of trade names; Lucite, Oroglas, Perspex, Plexiglas and acrylic resin which may vary from country to country. This material is one of the hardest polymers, rigid and good weather resistance. The usage of PMMA is widely spread in the medical technologies which reflected from a good degree of compatibility with human tissue, and can be used for replacement of intraocular lenses in the eye when the original lens has been removed in the treatment of cataracts. In orthopaedics, PMMA bone cement is used to affix implants and to remodel lost bone caused by traffic accident and war injures. In cosmetic surgery, tiny PMMA microspheres suspended in some biological fluid are injected under the skin to reduce wrinkles or scars permanently. Parts made of PMMA have high mechanical strength and good dimensional stability. Other reported properties include a high Young's modulus and good hardness with low elongation at break. Therefore, PMMA was used extensively as aircraft windshields for many aircraft (hitting a bird at 600 mph is dangerous to aircraft as it is deadly for birds). On the other side, typical working loads during Polymers service are the loads leading to fracture. Even though this kind of loading resistance in PMMA is important, there is a deficiency in the literature in this area. Accordingly, covering this area constitutes very important potential for research and study. Therefore, the purpose of this research is to investigate the fracture behavior of PMMA. Two methods of preparing the specimens (method of cure) will be taken into consideration. As a result of this research, more accurate data about fracture and mechanical properties about this widely used material in dental applications are becoming available for dentists. Tensile, compression and fracture tests were carried out in this study. The results showed that a slight improve in the tensile strength of the long curing process specimens compared with short curing specimens. However, the compressive strength of the short curing is better than long curing specimens. The fracture test results showed that the fracture toughness of the short curing specimens is higher than that of the long curing specimens. | ||||
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