Physical and mechanical properties of dual functional cements—an in vitro study

Abstract

The dual functional cements could be used for one-stage post and core buildup restorations since they possess similar physical and mechanical properties of luting resin cements and Core Buildup composite resin.

Immediate and long-term microshear bond strength of resin-based cements to core build-up materials

“…The core build-up materials have dual functionality, being inserted in a single layer to cement the post, and reconstruct the crown in the same clinical act ( 7 , 18 ). This technique reduces the time required to perform the procedure, the number of materials used, the technical sensitivity and incompatibilities between luting agent and core build-up material ( 11 ).…”

“…Nevertheless, after 9 months, the Bis-Core material showed higher bond strength values compared to conventional resin composite, rejecting the second null hypothesis. The maintenance of the bond strength values of the commercial core build-up materials over time can be attributed to the dual cure that occurs in these materials ( 7 ), which is not found in Filtek Z350, which presented loss of bond strength over time ( 18 ). The stable bonding performance of Bis-Core and LuxaCore Z could be due to the concentration of dimethacrylate monomers ( 14 ), justifying the prevalence of mixed fracture patterns in the samples, as shown in Figure 2 .…”

“…Adhesive cementation of ceramic crowns increases the fracture resistance of the core-crown complex ( 20 ) and directly correlates with long-term clinical success. Previous studies have evaluated the adhesive relationship between post and luting agent ( 9 , 18 ), post and core material ( 21 ), luting agent and enamel/dentin ( 12 ), tooth and core materials ( 22 ), and crown and core materials ( 23 ). However, there is a lack of investigations about the bonding relationship between cement and the material used to perform the core build-up restorations.…”

Characterization of Experimental Short-Fiber-Reinforced Dual-Cure Core Build-Up Resin Composites

“…Most of these materials are made of methacrylate resin and have a higher filler content and mechanical strength compared to dual-cure resin cements [ 7 ]. It is important to know that adding extra particulate-fillers improves the mechanical properties of the post-luting agent but also increases the viscosity, which in turn affects the adhesive interface integrity and leads to a deterioration of the bond strength and the potential development of microleakage [ 8 , 9 ]. In addition, the high viscosity of the material may limit it from being injected into the root canal, resulting in gaps and voids at interfaces [ 9 , 10 ].…”

“…It is important to know that adding extra particulate-fillers improves the mechanical properties of the post-luting agent but also increases the viscosity, which in turn affects the adhesive interface integrity and leads to a deterioration of the bond strength and the potential development of microleakage [ 8 , 9 ]. In addition, the high viscosity of the material may limit it from being injected into the root canal, resulting in gaps and voids at interfaces [ 9 , 10 ]. Conversely, high viscosity might offer benefits in the manipulation of the material during core-build up procedure.…”