Discoloration of facing and restorative composites by UV-irradiation and staining food.
OBJECTIVE
The purpose of this study was to investigate the color stability of five facing (ConquestSculpture: JenericPentron, USA; ThermoresinLC: GCCorporation, J; VitaZetaLC: Vita, G; CompoPlus: Degudent, G; belleGlassHP: SDSbelle, G) and three restorative (Definite: DeguDent, G; AristonpHc: Ivoclar-Vivadent, FL; SpectrumTPH: DeTreyDentsply, G) composite materials subject to UV-irradiation and storage in red wine.


METHODS
16 cylindrical specimen (height 5 mm, diameter 6 mm) of each material were fabricated. Baseline measurement of the CIE-L*a*b* color data was carried out in a reflection spectrophotometer. Artificial aging was performed with a filtered xenon lamp (irradiation value: 765 W/m2). Eight samples of each group were aged and color measured after 24 and 72 h. Eight specimens were stored in deionized water under light exclusion as a control for 10 days. Afterwards all specimen were stored in red wine and color measurement took place again after 10 days. Statistical analysis was performed using the Mann-Whitney-U-test (p < or = 0.05).


RESULTS
The best color stability after 72 h of UV-irradiation was shown by ConquestSculpture (DeltaE* = 1.0), VitaZeta (DeltaE* = 0.8) and Spectrum (DeltaE* = 0.9). Lowest discoloration for the red wine storage was DeltaE* = 1.0 for belleGlass, the highest DeltaE* = 9.8 for ThermoresinLC. For all materials red wine storage caused more color change in the control than in the irradiated group.


CONCLUSIONS
Assuming values of DeltaE* < or = 3.3 as clinically acceptable, all tested materials showed sufficient color stability during aging. For the facing materials UV-irradiation might be recommended to approve resistance to discoloration by staining foods.
Kolbeck
Carola
C
Department of Prosthetic Dentistry, University of Regensburg, Regensburg, Germany. carola.kolbeck@klinik.uni-regensburg.de
Rosentritt
Martin
M
Lang
Reinhold
R
Handel
Gerhard
G
D003116:Color; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D003801:Dental Veneers; D005502:Food; D006801:Humans; D008029:Lighting / Q000295:instrumentation; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013053:Spectrophotometry; D013729:Terpenes / Q000737:chemistry; D013997:Time Factors; D014466:Ultraviolet Rays; D014920:Wine
C409382:Ariston pHc; D003188:Composite Resins; C092421:Conquest composite resin; C421785:Definite composite resin; D003764:Dental Materials; D008689:Methacrylates; D012833:Siloxanes; C467914:TPH spectrum; D013729:Terpenes; C110370:belleGlass; C083619:thermoresin LC