Bonding Properties of Self-adhesive Resin Cement in Self-cure Mode

Objectives: Self-curing capability is important for the bonding property of cement especially when restorative material is opaque or thick, limiting light penetration for photo curing. The purpose of this study was to research bonding properties of self-adhesive resin cement in self-cure mode.
Methods: G-CEM CERASMART^TM : GCS (GC), G-CEM LinkAce^TM:GLA (GC), RelyX™ Unicem2 Automix : U2A (3M), BeautiCem™ SA : BCS (SHOFU) and PANAVIA™ SA Cement Plus : PSP (Kuraray) were used in this study. Bonding properties were evaluated by shear bond strength test (SBS). Specimens of bovine anterior tooth dentin were prepared and embedded with acrylic resin. Exposed flat surface was finished with 600-grit SiC paper. Bonding area (3mm-diameter, 0.1mm-thickness) and cement thickness were defined by plastic-tape. Stainless-steel rod was cemented without light-curing. Specimens were stored in 37°C distilled water for 24 hours. In thermal cycle load (TC), the specimens were placed under thermal cycling (5-55°C for 5,000 and 20,000 cycles). SBS was measured by SHIMADZU AG-I [Crosshead speed 1mm/min, N=5 and statistically analyzed (ANOVA,p<0.05)].
Results: GCS, GLA and PSP showed higher SBS than the other cements statistically, and the mean-value of GCS and GLA tend to be higher. Both GCS and GLA also had higher SBS after 20,000 thermal cycle test.
Conclusions: In this study, bonding properties with self-curing of GCS and GLA were higher than the other cements. This may be due to higher chemical polymerization of these cements in self-cure mode. Clinical application of GCS and GLA may be beneficial due to stable bonding in self-cure mode if curing light is difficult to reach cement and achieve photo curing.