Effects of different polishing methods on color stability of resin composites after accelerated aging

Dent Mater J. 2013;32(1):58-67. doi: 10.4012/dmj.2012-045.

Abstract

The purpose of this study was to evaluate the effect of polishing procedures on the color stability of different types of composites after aging. Forty disk-shaped specimens (Ø10×2 mm) were prepared for each composite resin type (an ormocer, a packable, a nanohybrid, and a microhybrid) for a total of 160 specimens. Each composite group was divided into four subgroups according to polishing method (n=10): control (no finishing and polishing), polishing disk, polishing wheel, and glaze material. Color parameters (L*, a*, and b*) and surface roughness were measured before and after accelerated aging. Of the polishing methods, glazed specimens showed the lowest color change (∆E*), ∆L*, and ∆b* values (p<0.05). Of the composite resins, the microhybrid composite showed the lowest ∆E* value, whereas the ormocer showed the highest (p<0.05). For all composite types, the surface roughness of their control groups decreased after aging (p<0.05). In conclusion, all composite resins showed color changes after accelerated aging, with the use of glaze material resulting in the lowest color change.

Publication types

  • Evaluation Study

MeSH terms

  • Analysis of Variance
  • Colorimetry
  • Composite Resins / chemistry*
  • Dental Polishing / methods*
  • Light / adverse effects
  • Materials Testing
  • Spectrophotometry
  • Surface Properties
  • Time Factors

Substances

  • Composite Resins