الفهرس 
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Abstract
This study was conducted to evaluate the effect of the most commonly
consumed beverages that have been identified by a group of Egyptian
children on the microhardness and color of nanofilled esthetic restorative
materials (Filtek Z350 XT nanocomposite and Ketac N100 nanoglass
ionomer).
A questionnaire was carried out on 300 patients receiving treatment in
the outpatient clinic of Pediatric Dentistry Department in Ain Shams
University, to find out the 3 most commonly consumed beverages by them.
The patients selected were ranging from 6 to 15 years old and were not
medically compromised.
Based on the results of the questionnaire, the three most commonly
consumed beverages by the selected sample were found to be Cola drinks
(Pepsi and Coca Cola), Mango juice and Tea with Milk. The beverages
chosen to carry out the study were Pepsi, Juhayna mango nectar and tea with
milk (Lipton Yellow Label tea, Juhayna full cream milk and white sugar).
30 specimens (diameter 7mm and thickness 3mm) were prepared from
each of the above mentioned restorative materials using split Teflon mold.
The specimens were stored in deionized water as a transporting medium till
being measured. Then the specimens were blotted dry with tissue paper and
measured for color and microhardness before being immersed in the
beverages.
The 30 specimens of each material were further divided into 3 groups.
Each group (10 specimens) was immersed in one of the 3 selected beverages
(250 ml each) at room temperature and stored for 24 hours in glass beakers
sealed tightly using cling wrap.
After the 24 hours storage, the specimens were then rinsed with
running deionized water for 5 minutes each. They were stored in deionized
water as a transporting medium till being re-measured. The specimens were
then blotted dry with tissue paper, and re-measured for color and
microhardness.
UV – Shimadzu 3101 PC –Spectrophotometer was used for color
measurements. The measurements were performed at the National Institute
for Standards (NIS), division of photometry and radiometry of metrology
(photometry and colorimetry Lab.).
MHV -2 Shimadzu Microhardness tester was used for microhardness
measurements, using vicker’s hardness test. The measurements were
performed at the National Institute for Standards (NIS), division of Mass and
force Metrology (lab of force and material metrology).
Color results showed that Ketac N100 glass ionomer had statistically
significantly higher mean ΔE than the Filtek Z350 XT resin composite after
immersion in Pepsi, mango juice and tea with milk. Results also revealed that
Pepsi showed the statistically significantly highest mean ΔE for both
restorative materials, this was followed by tea with milk, while mango juice
showed the statistically significantly lowest ΔE for both materials.
Regarding different interactions between the 2 restorative materials and
the 3 beverages used in the current study, Ketac N100 glass ionomer
immersed in Pepsi showed the statistically significantly highest mean ΔE.
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