Shear strengths and shear elastic moduli of self-adhesive resin cements─ Effect of specimen storage and/or light irradiation conditions ─

Abstract

The study examined the effect of storage conditions on the shear strength and shear elastic modulus of dual-cured self-adhesive resin cements. Three commercially available dual-cured self-adhesive resin cements ［G-CEM ONE (GC), BeautiCem SA (Shofu), and RelyX Unicem2 Clicker (3M Japan)］ were used in the study. Each specimen was immersed in deionized water (Wet), stored under dry conditions with silica gel (Dry), or subjected to thermal cycling up to 10,000 cycles (TC). The shear strength of the specimens was also measured one hour after the start of cement mixing as the baseline strength. In addition, specimens with or without light irradiation were prepared for each storage condition. The shear strengths were determined using the punch tool in the universal testing machine (n＝10 for each condition). The shear strengths of specimens with light irradiation were greater than those without light irradiation. A trend was found whereby Dry specimens showed weaker strength than Wet and TC specimens. The shear elastic moduli of Dry specimens tended to be greater than those of Wet and TC. It was suggested that the specimen storage conditions affected both the shear strength and shear elastic modulus of the dual-cured self-adhesive resin cements examined.