Fracture resistances evaluation of four different restorative materials

SUMMARY In temporary dentistry, although a range of materials have been used in the restoration of decideous and permanent teeth, amalgam restorations have the first place among them for long time. Since the various disadvantages which amalgam had, it is known that most extensive used materials in the second place are composite resin and glass ionomer restorations. It is generally accepted that materials to be used in the posterior restoration of teeth should present a high fracture resistance. Studies illustrate that many of these materials expose time and economic loss because of their flimsiness to the bite forces. This study was conducted for the purpose of evaluation of the durability to the vertical forces of four different types of restorative materials on the teeth with class II cavities. This in-vitro study was accomplished on the 60 premolar teeth which extracted for periodontal and orthodontic reasons. Teeth which their standard proximal cavities were prepared by fixing them inside the cold acrylic blocs were randomly divided into the four equal groups each of them consist of 15. Restoration process was completed in the Faculty of Dentistry, Department of Pedodontics. Having placed the Valux Plus material to the first group, Herculite XRV to the second one, Vitremer to the third one and Chelon Silver to the fourth one, fracture resistance of the restorations was measured by the Testometric micro-500 machine in the laboratory of Republic of Turkey Ministry of Industry and Trade, Small and Medium Industry Development Organization (KOSGEB-Ankara). Obtained data was assessed statistically by using One Way ANOVA and Post-Hock test. Approximate fracture resistance values were determined as follow: 66,9113 kgf. for Valux Plus, 55,2187 kgf. for Herculite XRV, 51,1493 kgf. for Vitremer and finally, 38,0633 kgf. for Chelon Silver. Among the four different type of restorative substance, it was established that Valux Plus had the highest and Chelon Silver had the lowest fracture resistance.Classification of the fracture resistance values, which was obtained after the statistical analyses, from highest resistance to lower ones is as follow: Valux Plus > Herculite XRV > Vitremer > Chelon Silver (p< 0.001). Key words: Composite resin, Glass ionomer cement, Fracture resistance.