Comparison of flexural properties and surface roughness of nanohybrid and microhybrid dental composites

Jennifer Melander, W. Patrick Dunn, Michael P. Link, Yong Wang, Changqi Xu, Mary P. Walker

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9 Scopus citations

Abstract

Recently introduced nanohybrid dental composites have promised a smoother surface finish and strength, comparable to that of microhybrid composites. This study compared the mechanical properties and surface finish of nanohybrid and microhybrid composites by measuring the flexural strength and modulus (four-point bend) and surface roughness after polishing (using atomic force microscopy) of six commercial dental composites (three nanohybrid, three microhybrid). Scanning electron microscopy (SEM) was used to qualitatively characterize filler morphology and size. The flexural strength and modulus were significantly higher among the microhybrid composites, while the nanohybrid composites exhibited significantly lower surface roughness. SEM characterization revealed differences in filler particle size and shape that could affect the flexural properties and surface roughness. Composites containing spherical filler particles exhibited higher flexural properties and lower roughness values compared to composites with irregular fillers. These results did not support the premise that nanohybrid composites offer similar mechanical properties to microhybrids in addition to a better surface finish.

Original languageEnglish (US)
Pages (from-to)342-347
Number of pages6
JournalGeneral dentistry
Volume59
Issue number5
StatePublished - Sep 1 2011

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ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Melander, J., Dunn, W. P., Link, M. P., Wang, Y., Xu, C., & Walker, M. P. (2011). Comparison of flexural properties and surface roughness of nanohybrid and microhybrid dental composites. General dentistry, 59(5), 342-347.