Effect of Ingested Liquids on Color Change of Composite Resins.
OBJECTIVE
Color change of composite restorations is well known to dentists. However, the effect of commonly consumed drinks on discoloration of composite resins has yet to be determined. This study sought to assess the color change of a nanofilled (Premise) and a flowable composite resin (Premise flowable) following simulated consumption of tea, cola, iron drops and multivitamin syrup.


METHODS
Forty disk-shaped specimens (7 mm in diameter and 2 mm thick) were fabricated from each composite resin. The baseline color values were measured according to the CIE L*a*b* system using digital imaging. The specimens of each restorative material were randomly divided into five groups (eight each) according to the storage media namely tea, cola, iron drops, multivitamin syrup or distilled water (control). The specimens were immersed in staining solutions for three hours daily over a 40-day test period. Following this, the color change values (ΔE*) were calculated. For statistical analyses, the color differences were analyzed using two-way ANOVA and Tukey's test (P< 0.05).


RESULTS
There was no significant difference in ΔE* values between the two types of composite resins (P>0.05). In both composite materials, the difference among the solutions was not significant (P>0.05).


CONCLUSIONS
Under the tested experimental conditions, both restorative materials were susceptible to discoloration by all four staining solutions. The color change values were not related to the solution or the type of material used.
Associate Professor, Department of Pedodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Beheshteh
B
Malek Afzali
Associate Professor, Department of Restorative Dentistry, Dental Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Amir
A
Ghasemi
Dentist, Tehran, Iran.
Asrin
A
Mirani
Postgraduate Student of Pediatric Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran- Iran.
Zahra
Z
Abdolazimi
PhD in Biostatistics, Associate Professor, Department of Basic Sciences, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Alireza
A
Akbarzade Baghban
Epidemiologist, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Statistical and Methodology Department, Dental School, Tehran University of Medical Sciences, Tehran, Iran.
Mohammad Javad
MJ
Kharazifard
Color; Composite Resins; Tooth Discoloration