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

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2008-01-01

Author

HUBBEZOĞLU, İHSAN
Akaoglu, Baris
DOĞAN, ARİFE
Keskin, Selda
Bolayir, Giray
ÖZÇELİK, SÜLEYMAN
DOĞAN, ORHAN MURAT

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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.

Subject Keywords

Ceramics and Composites, General Dentistry

URI

https://hdl.handle.net/11511/68437

Journal

DENTAL MATERIALS JOURNAL

DOI

https://doi.org/10.4012/dmj.27.105

Collections

Department of Chemistry, Article

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Citation Formats

İ. HUBBEZOĞLU et al., “Effect of bleaching on color change and refractive index of dental composite resins,” DENTAL MATERIALS JOURNAL, pp. 105–116, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68437.