| ORIGINAL ARTICLE |
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| Year : 2013 | Volume
: 1
| Issue : 1 | Page : 11-16 |
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Effects of different concentrations of hydrogen peroxide on the color stability of various esthetic restorative materials in vitro
Haluk Baris Kara1, Tevfik Yavuz2, Ali Riza Tuncdemir3, Ozgun Yusuf Ozyilmaz2
1 Department of Prosthodontics, Faculty of Dentistry, Istanbul Medipol University, Istanbul, Turkey
2 Department of Prosthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey
3 Department of Prosthodontics, Faculty of Dentistry, Konya Necmettin Erbakan University Faculty of Dentistry, Konya, Turkey
Correspondence Address:
Haluk Baris Kara
Istanbul Medipol University, Ataturkbulv. No. 27 unkapani, 34083 Fatih, Istanbul
Turkey
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/2347-4610.116587
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Purpose: The aim of this in vitro study was to determine the color changes of four different restorative materials after exposing these materials to two different bleaching agents. Materials and Methods: In this study, bleaching agents were applied to a low-fusing porcelain (VITA VM9), heat-pressed glass ceramics (IPS Empress Esthetic), and two types of composites (Clearfil Majesty Esthetic and Clearfil Photo Posterior). Twenty disc-shaped specimens were fabricated (with a diameter of 10 mm and a thickness of 2 mm) from each material (n0 = 10). The initial color changes were measured using a spectrophotometer. The first set of specimens were bleached with 10% hydrogen peroxide (HP) for 1 h daily for 10 days. Another set of specimens were bleached with 40% HP bleaching gel for two consecutive applications for 20 min each. The data were analyzed statistically by using two-way analysis of variance (ANOVA) and post hoc Tamhane's T2 tests ( P < 0.05). Results: The mean color change value (ΔE) for Clearfil Majesty Esthetic was significantly higher than the value for VITA VM9 groups, treated with the 10% HP. In addition, the values for Clearfil Photo Posterior were significantly higher than the values for Clearfil Majesty Esthetic, IPS Empress Esthetic, and VITA VM9 groups treated with the 40% HP (P < 0.05). The comparative evaluation of bleaching agents on the color change of materials revealed that the differences between the bleaching agents were significant for the Clearfil Photo Posterior groups (P < 0.05). Conclusion: The effects of bleaching agents should be known and applied consciously when restorative materials (especially polymer-containing restorative materials) are present. |
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