IADR Abstract Archives
Immediate Bonding Property of Dual-Cure Resin Cement in Light-Cure Mode
Objectives: The dual-cure resin cement is often cured by light-curing mode since it can shorten a clinical time. However, there are clinical cases which are difficult to sufficiently light-cure such as at approximal area or under thick restoration, and its initial bonding property might be adversely affected. As a result, the longevity of the restorations may become short. To investigate this issue, we evaluated immediate bonding property of resin cements under thick restoration to simulate insufficient light curing.
Methods: Three resin cement systems (G-CEM ONE (GCO, GC), RelyX Universal (RXU, 3M) and PANAVIA SA Cement Universal (PSU, Kuraray)) were used in this study. Specimens of bovine anterior tooth dentin were embedded with acrylic resin. Exposed flat dentin surface was finished with 600-grit SiC paper. Bonding area (3.0mm diameter) and cement thickness (0.1mm thickness) were defined by plastic-tape. Sand-blasted CERASMART270 plate (1.0, 2.0 and 3.0mm thickness) was adhered to dentin by each resin cement system and light irradiated 10mm away from specimen according to the manufacturer’s instructions. Specimens were stored in 37°C 100%R.H. for 5 minutes. Tensile bond strength (TBS) was measured by SHIMADZU AG-I. [Crosshead-speed 1mm/min, n=8, statistically analyzed (2-way ANOVA followed by Tukey post-hoc test, α=0.05)]
Results: TBS of RXU and PSU were decreased with increase of CERASMART270 plate thickness. TBS of GCO was higher than the other products and showed no significant difference among tested thickness of CERASMART270.
Conclusions: TBS of RXU and PSU was affected by insufficient light curing. On the other hand, GCO showed high immediate bonding property even insufficient light curing. This may suggest that GCO provide stable performance on clinical situation. This result is brought by the chemical initiator in G-CEM ONE Adhesive Enhancing Primer which accelerates the chemical cure of G-CEM ONE even without light-curing.
Methods: Three resin cement systems (G-CEM ONE (GCO, GC), RelyX Universal (RXU, 3M) and PANAVIA SA Cement Universal (PSU, Kuraray)) were used in this study. Specimens of bovine anterior tooth dentin were embedded with acrylic resin. Exposed flat dentin surface was finished with 600-grit SiC paper. Bonding area (3.0mm diameter) and cement thickness (0.1mm thickness) were defined by plastic-tape. Sand-blasted CERASMART270 plate (1.0, 2.0 and 3.0mm thickness) was adhered to dentin by each resin cement system and light irradiated 10mm away from specimen according to the manufacturer’s instructions. Specimens were stored in 37°C 100%R.H. for 5 minutes. Tensile bond strength (TBS) was measured by SHIMADZU AG-I. [Crosshead-speed 1mm/min, n=8, statistically analyzed (2-way ANOVA followed by Tukey post-hoc test, α=0.05)]
Results: TBS of RXU and PSU were decreased with increase of CERASMART270 plate thickness. TBS of GCO was higher than the other products and showed no significant difference among tested thickness of CERASMART270.
Conclusions: TBS of RXU and PSU was affected by insufficient light curing. On the other hand, GCO showed high immediate bonding property even insufficient light curing. This may suggest that GCO provide stable performance on clinical situation. This result is brought by the chemical initiator in G-CEM ONE Adhesive Enhancing Primer which accelerates the chemical cure of G-CEM ONE even without light-curing.