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    STUDIA CHEMIA - Issue no. 1-2 / 2001  
         
  Article:   THE INFLUENCE OF THE REINFORCING MATERIALS ON THE PROPERTIES OF THE DENTAL COMPOSITES.

Authors:  MARIOARA MOLDOVAN, CRISTINA PREJMEREAN, VIOLETA POPESCU, MARIA BRIE, GABRIEL FÂRTOŞ. 		 
       
         
  Abstract:  The influence of inorganic reinforcing materials and their mixtures on the strength, hardness, and color shade of composite materials was studied. Variation of grain size distribution and specific area on composite surface appearance and on tensile and compressive strength was also studied. The size and the shape of the particles were investigated with a TESLA BS-500 electronic microscope. The particles have irregular shapes. Grain size distribution was determined with a COULTER-COUDLTER instrument, and specific area corresponding to each grain size was determined by the BET method. Compressive and tensile strength were determined with an INSTRON device. The best results regarding compressive strength were obtained using powders with specific area of 2.1 m2/g. Abrasion tests were made after maintaining the samples at 37C in water for a week. Rate of wear was also investigated. The rate of wear increases as the specific area increasing from 1.9 to 2.9 m2/g. The obtained results are between imposed limits for dental materials.  
         
     
         
         
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