Ahmed Nadhir Jebur, Abdalbaseet A. Fatalla
and Hikmat Jameel Aljudy
Department of Prosthodontics, College of Dentistry, University of Baghdad, Iraq.
The degradation of maxillofacial prosthetic elastomers that occur throughout life service is usually responsible for the replacement of the prosthesis. The aim of this study was to evaluate the effect of adding different concentrations of 2mm length polyester fibers on the tensile strength, elongation percentage, tear strength, shore A hardness and surface roughness of A-2186 RTV silicone elastomer. 120 samples were fabricated by the addition of (0.25% and 0.5%) by weight of 2 mm length polyester fibers to A-2186 platinum RTV silicone elastomer. The samples were divided into four groups, each group containing 30 samples according to the conducted tests except for the elongation percentage test which was measured concurrently with the tensile strength test. The 30 samples of each test was subdivided into 10 samples for control groups (without addition of polyester fibers),10 samples of 0.25% by weight polyester fiber/silicone group and 10 samples of (0.5%) by weight polyester fibers/silicone group. The addition of (0.25%) and (0.5%) by weight of polyester fibers to A-2186 maxillofacial elastomer resulted in significant difference in the mean values of tensile strength (P≤0.05) for 0.5% by wt. group and non-significant difference at 0.25% group when compared to control group. However; elongation percentage for both concentrations 0.25% and 0.5% by wt. show significant difference after addition, the tear strength results showed highly significant difference between all tested groups. Surface roughness and shore A hardness on the other hand show highly significant difference (P≤0.01) of mean values for both 0.25%, 0.5% by wt. concentrations. Incorporation of 0.25% by wt. of 2 mm polyester fibers improve some of mechanical properties and may result in an increase in the service life of the prosthesis.
Keywords: Polyester fibers, Room Temperature, Silicone Elastomer.