IADR Abstract Archives
Bonding Strength for Lithium Disilicate Glass-Ceramics in Resin Cement System.
Objectives: Adhesion of resin cement to prosthesis is important for long-term durability. Recently, various glass ceramics and resin cements are used, and the bond strength of each combination is expected to vary depending on the properties of each material. The purpose of this study was to evaluate the tensile bond strength (TBS) of several resin cement systems to lithium disilicate (LDS) glass-ceramics.
Methods: Three resin cement systems (G-CEM ONE (GO, GC) with G-Multi Primer (GMP, GC), Multilink Automix (MA, Ivoclar Vivadent) with Monobond Plus (MP, Ivoclar Vivadent), and Calibra Ceram (CC, Dentsply Sirona) with Calibra Silane Coupling Agent (CSCA, Dentsply Sirona)), and three LDS blocks (Initial LiSi Block (LB, GC), IPS e.max CAD (EC, Ivoclar Vivadent), and CEREC Tessera (CT, Dentsply Sirona)) were used. Three LDS blocks were cut out as 3mm-thickness, and EC and CT were fired according to manufacturer's instruction (LB doesn’t require firing). Surface of LDS specimens was finished with hydrofluoric acid (BISCO PORCELAIN ETCHANT 9.5% HF). Bonding area (3.0 mm diameter) and cement thickness(0.1 mm-thickness) were defined by plastic-tape. Stainless-steel rod was bonded against the bonding area by each resin cement in self-curing mode. GO was bonded to LB, MA was bonded to EC, and CC was bonded to CT. Specimens were stored in 37 oC distilled water for 24hours (24h), and placed under thermocycling condition (5-55 oC for 5000cycles: TC5000) afterward. TBS was tested with universal test equipment (SHIMADZU AG-IC, crosshead-speed 1 mm/min, n=5). Data were analyzed using 2-way ANOVA followed by Tukey post-hoc test (α=0.05).
Results: Results were shown in Fig.1. There was no effect of thermocycling on TBS in each resin cement system. GO/GMP/LB combination showed significantly higher TBS than combination of MA/MP/EC and CC/CSCA/CT.
Conclusions: G-CEM ONE system has high bond strength to Initial LiSi Block before and after thermocycling. It is expected that G-CEM ONE system has superior bond durability.
Methods: Three resin cement systems (G-CEM ONE (GO, GC) with G-Multi Primer (GMP, GC), Multilink Automix (MA, Ivoclar Vivadent) with Monobond Plus (MP, Ivoclar Vivadent), and Calibra Ceram (CC, Dentsply Sirona) with Calibra Silane Coupling Agent (CSCA, Dentsply Sirona)), and three LDS blocks (Initial LiSi Block (LB, GC), IPS e.max CAD (EC, Ivoclar Vivadent), and CEREC Tessera (CT, Dentsply Sirona)) were used. Three LDS blocks were cut out as 3mm-thickness, and EC and CT were fired according to manufacturer's instruction (LB doesn’t require firing). Surface of LDS specimens was finished with hydrofluoric acid (BISCO PORCELAIN ETCHANT 9.5% HF). Bonding area (3.0 mm diameter) and cement thickness(0.1 mm-thickness) were defined by plastic-tape. Stainless-steel rod was bonded against the bonding area by each resin cement in self-curing mode. GO was bonded to LB, MA was bonded to EC, and CC was bonded to CT. Specimens were stored in 37 oC distilled water for 24hours (24h), and placed under thermocycling condition (5-55 oC for 5000cycles: TC5000) afterward. TBS was tested with universal test equipment (SHIMADZU AG-IC, crosshead-speed 1 mm/min, n=5). Data were analyzed using 2-way ANOVA followed by Tukey post-hoc test (α=0.05).
Results: Results were shown in Fig.1. There was no effect of thermocycling on TBS in each resin cement system. GO/GMP/LB combination showed significantly higher TBS than combination of MA/MP/EC and CC/CSCA/CT.
Conclusions: G-CEM ONE system has high bond strength to Initial LiSi Block before and after thermocycling. It is expected that G-CEM ONE system has superior bond durability.