engleski

Microleakage of root filled teeth after cyclic loading when restored with Glassix posts and metal crowns

The aim of this study was to evaluate the microleakage of root filled teeth after cyclic loading when restored with Glassix posts and metal crowns. In 30 filled root canals of central maxillary incisors Glassix posts(Harald Nordin sa, Chailly/Montreaux, Switzerland) were cemented with either Harvard (Richter&Hoffmann, Harvard Dental GmbH, Berlin, Germany), Fuji PLUS (GC Corporation, Tokyo, Japan), or Variolink II cements (Vivadent, Schaan, Lichtenstein) in three groups of ten canals each. The coronal restoration consisted of composite cores (Clearfil core, Kuraray, Osaka, Japan) and metal cast crowns. Specimens were embedded in acrylic resin and loaded on a special testing machine. A load was applied at an angle of 135% to the long axis of the tooth, with forces oscilating from 0 to 35 N. Each specimen was exposed to 700 000 cycles through a period of 148 h. After performing cyclic loading, specimens were prepared for testing of microleakage. The acrylic bases were removed and the crowns were sectioned along with the composite cores and the coronal aspect of the Glassix posts to leave 15 mm long roots. Coronal microleakage was evaluated using a fluid transport system. The movement of an air bubble in a capillary glass tube connected to the apex of the experimental root section was measured over 5-min periods. Measurements were performed four times for each specimen and the mean values were recorded. Analyses of variance were performed. The highest values of microleakage (microlitres) occured in the group cemented with Harvard cement(0.67), followed by Fuji PLUS (0.55) and Variolink II (0.22) cements. Results among the groups were significantly different. Canals with Glassix posts cemented with Variolink II cement had the least leakage after cyclic loading.

microleakage ; Glassix post ; cyclic loading

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