ABRASIVE WEAR RESISTANCE OF DENTURE BASE

Document Type : Original Article

Authors

1 Department of Mechanical Design, Faculty of Engineering, Cairo University, Giza, Egypt

2 Galaa Teaching Hospital.

3 Endodontic department, Faculty of Dentistry, Sinai university.

4 Department of Production Engineering and Mechanical Design, Faculty of Engineering, Minia University, El-Minia.

5 Mechanical Engineering Dept., Faculty of Engineering, Suez Canal University, EGYPT.

Abstract

The present work aims to investigate the abrasive wear resistance of polymethyl methacrylate (PMMA) denture base. Experiments were conducted by sliding PMMA against stainless steel and composite resin at fresh and salt water wetted condition. Microparticles of sand (SiO2) of (5 – 10), (15 – 20), (20 – 30) and (25 – 50) µm size were applied as abrasive contaminants of 1.0 wt. % content.  Normal load of 5.0 N was applied at reciprocating sliding for 600 seconds. Friction coefficient, wear and voltage difference between the two sliding surfaces were determined.
 
It was found that fresh and salt water contaminated by sand particles displayed higher friction, voltage and wear. Friction and voltage values increased up to maximum then decreased with increasing sand particle size. It can be noticed that the tendency of sand particles to roll or embed in the two sliding surfaces controlled the values of friction, wear and voltage. Sliding of composite resin on PMMA showed higher wear values for PMMA than sliding of SS on PMMA. In the presence of salt water, friction and wear as well as the generated voltage recorded higher values than that observed for fresh water. This behavior may be attributed to the relatively better electrical conductivity of salt water that increased the adhesive force between the two sliding surfaces due to the electric force induced by voltage generated from friction.

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