• Saijai Tanthanuch D.D.S., M.S. (Operative Dentistry), Dip, Thai Board of Operative Dentistry
• Boonlert Kukiattrakoon D.D.S., M.S. (Prosthodontics), LLB
• Pimmada Kedrak D.D.S.

Objective To investigate the effect of green and white tea on stainability of nanofill, hybrid and
microfill resin composites.

Materials and methods Twenty six discs of each resin composite including Filtek Z350 and Premisa
as nanofill, Filtek Z250 and Point 4 as hybrid, Clearfil ST and Durafil VS as microfill resin composite,
were prepared. Twenty discs were tested by spectrophotometer of stainability for baseline. Two discs
of each group were tested for scanning electron microscopic analysis of surface characteristics for
baseline, the effect of green and white tea. Twenty four discs were immersed in green and white tea for
5 seconds and in artificial saliva for 5 seconds for 10 cycles. After that, specimens were stored in
artificial saliva for 24 hours. These processes were repeated 5 times. After immersions, twenty discs
for stainability measurements and two discs of each group for surfaces characteristic were re-evaluated.
The data were analyzed by two-way repeated ANOVA, Tukey HSD test and paired t-test at
significance level 0.05.

Results This study showed that after immersion in green and white tea, stainability of all resin
composites increased but not significantly (p > 0.05) except stainability of Filtek Z350 after immersion
in green tea, and Durafil VS after immersion in green and white tea, which increased significantly
(p < 0.05).

Conclusion Stainability of all resin composites increased after immersion in green and white tea.

(CU Dent J. 2011;34:169-80)