Influence of increment thickness on radiant energy and microhardness of bulk-fill resin composites


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Karacolak G. , Turkun L. S. , Boyacioglu H. , FERRACANE J. L.

DENTAL MATERIALS JOURNAL, vol.37, no.2, pp.206-213, 2018 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 37 Issue: 2
  • Publication Date: 2018
  • Doi Number: 10.4012/dmj.2017-032
  • Title of Journal : DENTAL MATERIALS JOURNAL
  • Page Numbers: pp.206-213
  • Keywords: Radiant energy, Microhardness, Degree of conversion, Bulk-fill resins, LIGHT-CURING UNITS, POLYMERIZATION EFFICIENCY, RESTORATIVE MATERIALS, DEPTH, CURE, CONVERSION, HARDNESS, TRANSLUCENCY, PERFORMANCE, STRENGTH

Abstract

Determining the energy transferred at the bottom of eleven bulk-fill resin composites, comparing top and bottom microhardness's and evaluating the correlation between microhardness and radiant energy were aimed. Samples were placed over the bottom sensor of a visible light transmission spectrophotometer and polymerized for 20 s. The bottom and top Knoop microhardness were measured. Paired t-test and correlation analysis were used for statistics (p <= 0.05). In all groups, the bottom radiant energy decreased significantly with increasing thickness. For groups of Aura 2 mm, X-tra Fil 2 and 4 mm, SDR 2 and 4 mm, X-tra Base 2 mm no significant difference was found between top and bottom microhardness. For the bottom levels of Aura, X-tra Fil, Filtek Bulk-Fill Posterior, SDR, X-tra Base groups no significant difference was found between the microhardness's of 2 and 4 mm thicknesses. For X-tra Fil, Tetric Evo Ceram Bulk-Fill, Filtek Bulk-Fill Flowable and Z100 groups radiant energy affected positively the microhardness.