Journal of Dentistry
Volume 36, Issue 3 , Pages 219-223, March 2008

Change of shade by light polymerization in a resin cement polymerized beneath a ceramic restoration

  • H. Cenker Kucukesmen

      Affiliations

    • Department of Prosthodontics, Faculty of Dentistry, University of Suleyman Demirel, Eastern Campus, Isparta, Turkey
    • ,
  • Aslıhan Usumez

      Affiliations

    • Department of Prosthodontics, Faculty of Dentistry, Gaziantep University, Campus, Gaziantep, Turkey
    • Corresponding Author InformationCorresponding author at: Gaziantep Üniversitesi, Dişhekimliği Fakültesi, Protetik Diş Tedavisi Anabilim Dalı, Kampüs, Gaziantep, Turkey. Tel.: +90 342 3606060/76151.
    • ,
  • Nilgun Ozturk

      Affiliations

    • Department of Prosthodontics, Faculty of Dentistry, Selcuk University, Campus, Konya, Turkey
    • ,
  • Erdal Eroglu

      Affiliations

    • Department of Prosthodontics, Faculty of Dentistry, University of Suleyman Demirel, Eastern Campus, Isparta, Turkey

Received 11 July 2007; received in revised form 7 December 2007; accepted 18 December 2007.

Abstract 

Objectives

The aim of this in vitro study was to examine the effect of the color changes of a resin cement material (Variolink II) polymerized beneath a simulated ceramic restoration (IPS Empress II) by two different light polymerizing units.

Methods

A conventional halogen light and a light emitting diode unit were used to polymerize resin cement with catalyst. A pressable ceramic block (10mm in diameter, 2 or 1mm in height) was used as an interface between the polymerizing light tip and resin cement. Colorimetric values of the specimens before and after polymerization were measured using a spectrophotometer (Easy Shade). The CIE L*a*b color system was used for the determination of the color difference. Differences between measurements were calculated as ΔE*ab. Repeated measurements analysis of variance (ANOVA) was used to analyze the data (polymerization of resin cement, polymerizing unit and ceramic thickness) for significant differences. The Tukey HSD test and paired two-tailed tests were used to perform multiple comparisons (α=.05).

Results

L*a*b values of ceramic system were affected by the polymerization of resin cement (before and after) (P<.01). The a* value was affected by polymerization unit (P<.05), however L* and b* values were not affected by the light polymerization unit (P>.05). The b* value was affected by ceramic thickness (1 or 2mm) (P<.05), but L* and a* values were not affected by ceramic thickness (P>.05). The specimens polymerized beneath 1mm ceramic thickness with conventional halogen light induced a significantly higher color changes than any other specimen (P<.05).

Conclusions

The results of this in vitro study suggest that light polymerization of the resin cement (Variolink II) used in this study is an important factor for the color of the definitive restoration and should be considered during shade selection and fabrication.

Keywords: Resin cement, Light polymerization, Color change

To access this article, please choose from the options below

Login to an existing account or Register a new account.

  • Purchase this article for 31.50 USD (You must login/register to purchase this article)

    Online access for 24 hours. The PDF version can be downloaded as your permanent record.

  • Subscribe to this title

    Get unlimited online access to this article and all other articles in this title 24/7 for one year.

  • Claim access now

    For current subscribers with Society Membership or Account Number.

  • Visit SciVerse ScienceDirect to see if you have access via your institution.
 

PII: S0300-5712(07)00267-9

doi:10.1016/j.jdent.2007.12.005

Journal of Dentistry
Volume 36, Issue 3 , Pages 219-223, March 2008

Article Tools