There was a condition to be considered, as the time to exposure to water because in previous reports it has been demonstrated that a highly significant decrease in flexural strength was seen for the bis-acrylic materials (Protemp 4, Cooltemp natural, and Luxatemp Fluorescence) from 24 h to 8 days, but there was no difference at 8 days 10 , it is possibly attributable to the excessive water uptake, which can promote breakdown causing a filler matrix debonding, this can spread polymer chains apart and facilitate slippage between chains 11 .
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