Effect of bleaching on color change and refractive index of dental composite resins

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HUBBEZOĞLU İ. , Akaoglu B., DOĞAN A., Keskin S., BOLAYIR G. , ÖZÇELİK S., ...Daha Fazla

DENTAL MATERIALS JOURNAL, cilt.27, sa.1, ss.105-116, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Konu: 1
  • Basım Tarihi: 2008
  • Doi Numarası: 10.4012/dmj.27.105
  • Sayfa Sayıları: ss.105-116


This study investigated the effects of three bleaching agents (Whiteness Perfect, Whiteness Super, and Whiteness HP) on the color change and refractive index of three dental composites (Admira, Durafill VS, and Gradia Direct). Twenty diskshaped specimens (10 x 2 mm) of each composite were prepared and divided into four subgroups (n = 5). An unbleached group was used as a control, while the remaining specimens in the three subgroups were bleached with one of the bleaching agents respectively. Color change was assessed according to CIELAB color system and refractive indices were determined by phase modulated spectroscopic ellipsometry. Color differences between bleaching and baseline value (Delta E) were less than 3.3 for all groups. However, bleaching with Whiteness HP led to noticeable color changes for Admira and Durafill VS. While this agent had no effect on the refractive indices of these composites, the other two agents containing carbamide peroxide increased their refractive indices. Therefore, results suggested that replacement of such composite restorations may be required after bleaching.