Effect of photopolymerization variables on composite hardness

H. Sazak-Öveçoǧlu, M. L. Öveçoǧlu, M. Günday, B. Tarçin, E. Eti

Research output: Contribution to journalConference articlepeer-review


The purpose of this study was to characterize the relation between total light energy and the final hardness of 4 composites polymerized under varying conditions. Four commercial composite restorative resins (Tetric Ceram™, Ivoclar Vivadent; Admira, Voco™; Arabesk™, Voco; Surefil™, Dentsply) were used to prepare 5 disk-shaped specimens (10 mm × 2 mm and 10 mm × 4mm) for each experimental condition. Photoactivation was carried out with a light device. The light-to-material distance was varied: (1) the light was maintained for 40 seconds with the end of the light source in contact (0 distance); or (2) the light was maintained for 40 seconds with the end of the light source is 10 mm away. Immediately after polymerization, Vickers hardness and surface roughness were determined on specimens surface that had been exposed to the light and on the opposing surface also. The specimens then were examined in the scanning electron microscopy (SEM) in different sections. The results were analyzed statistically. The Vickers hardness values of Surefil™, light applicated by 0 distance and 10 mm away, were significantly higher compared to other materials (p<0.001). The opposite surface of the surface exposed to light showed lower Vickers hardness values in all groups with the thickness of 2 mm and 4 mm.

Original languageEnglish
Pages (from-to)2027-2030
Number of pages4
JournalKey Engineering Materials
Issue numberIII
Publication statusPublished - 2004
EventProceedings of the 8th Conference and Exhibition of the European Ceramic Society - Istanbul, Turkey
Duration: 29 Jun 20033 Jul 2003


This study was financed with grant T014 from the University of Buenos Aires.

FundersFunder number
Universidad de Buenos Aires


    • Composite hardness
    • Photopolymerization
    • Surface roughness


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