Bonding Characteristics of Recent Adhesive-resin-cement Systems to Metal-free Restorative Materials
Objectives: The aim of this study was to evaluate the bonding characteristics of recent adhesive-resin cement-systems to various metal-free restorative materials by tensile bond strength(TBS) and using Weibull analysis. Methods: As recent adhesive-resin-cement systems, a system with a multi-use chemical-cure pretreatment agent(EC; ESTECEM II, Tokuyama Dental), a system with a multi-use light-cure resin-adhesive(RU; RelyX Ultimate, 3M ESPE), and a system with two different pretreatment agents(PV; PANAVIA V5, Kuraray Noritake Dental) were chosen. Six metal-free restorative materials; two silica based ceramic blocks(VB; VITABLOCS MarkII, VITA and EM; IPS e.max CAD, Ivoclar vivadent), a zirconia ceramic(LZ; Lava zirconia, 3M ESPE), an indirect hybrid-resin-composite(ES; Estenia C&B, Kuraray Noritake Dental), two hybrid-resin-composite blocks(CS; Cerasmart, GC and EN; ENAMIC, VITA) and human molar dentin(D; control) were used. All substrates were ground with SiC paper up to 800 grit and covered by an aluminum-sheet with 2.4 mm-diameter hole. Each specimen was pretreated following the manufacturer’s instructions prior to cementation. Cylindrical cured-resin-composite was cemented to the pretreated substrates with the cement systems. After 24 hrs storage in water, the TBS was measured (n=5). The data were analyzed using one-way ANOVA, Tukey’s test and Weibull analysis Results: The mean TBS(SD) in MPa to seven bonded restorative materials, Weibull modulus and the stress value in MPa for 10% probability of failure level{PF10} were EC; 13.5(4.7)<2.5>{6.3}, RU; 16.1(5.3)<3.4>{9.2}, PV; 9.2(5.7)<1.7>{2.7}. The TBS of three cement systems did vary with restorative. The Wm and PF10 of RU indicated the greatest value compared to the values of EC and PV. Furthermore, the Wm and PF10 of EC were significantly greater than those of PV. Conclusions: The bonding characteristics of three recent adhesive-resin-cement systems did vary with the bonded restorative. The bonding reliability of a recent adhesive-resin-cement system with a multi-use light-cure resin-adhesive was superior to those of two other cement systems.