The aim of the present research was to study the percentage
water sorption and solubility of Esthet composite
resin based on an ethoxylated bisphenol A glycol dimethacrylate
(Bis–EMA) and Heliomolar composite resin based
on bisphenol A glycol dimethacrylate (Bis–GMA). Six specimens
were prepared for each material using aluminum disc 15
mm in diameter and 1 mm in thickness between two glass
slides; then they were light cured for 80 seconds on each side.
Percentage water sorption and solubility were measured after
one week and one month. The results showed that water sorption
after 1 week for Esthet composite and Heliomolar composite
were 0.433 and 1.12, respectively and solubility were
0.074 and 1.066, respectively; while water sorption after 1
month were 0.517 and 2.57, respectively and solubility were
0.176 and 2.689, respectively.
It could be concluded that the percentage sorption and
solubility of composite based on Bis–EMA were significantly
lower than that based on Bis–GMA.