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  • Küçük Resim
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    Chemical degradation of restorative materials
    (TRANS TECH PUBLICATIONS LTD, 2004) Sazak-Ovecoglu, H; Gunday, M; Ovecoglu, ML; Ozer, F; Tarcin, B
    The chemical environment is an important aspect of the oral environment that could have an appreciable influence on restorative materials. The effects of chemical media on surface roughness, Vickers hardness and weight loss of a ceramic material, a hybrid ceramic resin, an ormocer and a posterior composite were investigated. The specimens were made for each material and were stored in artificial saliva at 37degreesC for 24 h. The weight of the specimens were recorded and then randomly divided into two groups and stored in the following chemicals for 2 weeks at 37degreesC: 0.02 N citric acid and 0.02 N lactic acid. After conditioning, the specimens were weighed again and subjected to Vickers hardness and surface roughness tests. The specimens were also examined in the scanning electron microscopy (SEM). All results were analyzed statistically. After a 2 week storage period, there was a significant weight loss in P60(TM) stored in citric acid and Admira(TM) stored in lactic acid. Vickers hardness values of all materials except Finesse were increased significantly (p<0.05).
  • Küçük Resim
    Öğe
    Mechanical properties of ceramics and composite resins
    (TRANS TECH PUBLICATIONS LTD, 2004) Sazak-Ovecoglu, H; Tarcin, B; Ozer, F; Gunday, M; Ovecoglu, ML; Gulmez, T
    We investigated the mechanical properties of certain dental restorative materials to assess their durability. This study determines the flexural strength of a ceramic material (Finesse(TM), Dentsply), a hybrid ceramic resin (Estenia(TM), Kuraray), an ormocer (Admira(TM), Voco) and a posterior composite resin (Solitaire2(TM), Heraeus Kulzer). The specimens were fabricated from the various restoratives. Flexural strength was determined in 4-point bending. Scanning electron microscopy (SEM) was used to examine and compare surface topography of the fractured and nonfractured surfaces. The results were analyzed statistically. The flexural strength values of Estenia(TM) samples were significantly higher compared to those of Admira(TM) and Finesse(TM) (p<0.006).