Abstract
The application of temporary cement on the tooth surface had an inhibitory effect on the adhesiveness between teeth and resin cements.We analyzed the influence of the remaining temporary cement on the adhesion, determining the adhesive strength of a resin cement to dentin.Bovine dentin was divided into several groups exposed to different temporary cements for 24 hours.Thereafter, the temporary cement was completely removed with an excavator.The adhesiveness of resin cement(Panavia 21, Kuraray Co.)to this surface was measured following a 24-hour storage in water at 37℃, and its interfacial layer was analyzed by SEM.The results showed an adhesive strength of 3.6MPa on the surface pretreated with HY-Bond Temporary Cement(Shofu Co.), 4.9MPa with Freegenol Temporary Pack(GC Co.), and 5.3MPa with Tempack(Westward Co.), all lower than the 6.9MPa, presented by the control group.The SEM images of the interfacial layer revealed a hybrid layer of 0.5μm in thickness, in the control specimens whereas no hybrid layer existed on the specimens treated with temporary cements.
