The effect of a leucite-containing ceramic filler on the abrasive wear of dental composites

Mohammad Atai, Esmaeil Yassini, Maryam Amini, David C. Watts

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Objectives: The aim of this study was to evaluate abrasive wear of a dental composite based on a leucite-containing (KAlSi2O2) ceramic filler, and to compare it with the wear of a composite based on commonly used aluminum barium silicate glass filler. Methods: IPS Empress (Ivoclar-Vivadent) ingots were ball milled, passed through an 800 mesh (ASTM) sieve, and used as the leucite ceramic filler. Experimental composites were prepared by mixing the silane-treated fillers with the resin monomers. The resin consisted of 70 wt% Bis-GMA and 30 wt% TEGDMA containing camphorquinone and DMAEMA as the photoinitiator system. Glass-based composites were also prepared using silane-treated aluminum barium silicate glass fillers and the same resin system. TetricCeram®, a commercially available dental composite, was used as control. Spherical specimens of the composites were then prepared and kept in water for 2 weeks to reach equilibrium with water. An abrasive wear test was performed using a device designed in our laboratory and weight loss of the specimens was measured as an abrasion parameter after each 50 h. SEMs were taken from worn and fractured surfaces. Degree-of-conversion of the composites was measured using FTIR spectroscopy. Vickers surface microhardness, flexural strength, and flexural modulus of the composites were also measured. The data were analyzed and compared using ANOVA and Tukey HSD tests (significance level = 0.05). Results: The results showed that there were significant differences among the abrasive wear of the composites (p <0.05). The ranking from least to most was as: leucite-based composite <TetricCeram® <glass-based composite. The higher wear resistance of leucite-based composite could be related to its higher surface hardness. Significance: Using leucite-containing glass as an alternative for aluminum barium silicate glass fillers in dental composites generated a significant increase in the wear resistance of the resin composites which should be beneficial in the development of dental materials. © 2007 Academy of Dental Materials.
    Original languageEnglish
    Pages (from-to)1181-1187
    Number of pages6
    JournalDental Materials
    Volume23
    Issue number9
    DOIs
    Publication statusPublished - Sep 2007

    Keywords

    • Abrasive wear
    • Dental composite
    • Filler
    • Leucite-containing ceramic

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