Bond strength of selected composite resin-cements to zirconium-oxide ceramic

Abstract

Objectives: The aim of this study was to evaluate bond strengths of zirconium-oxide (zirconia) ceramic and a selection of different composite resin cements. Study Design: 130 Lava TM cylinders were fabricated. The cylinders were sandblasted with 80 µm aluminium oxide or silica coated with CoJet Sand. Silane, and bonding agent and/or Clearfil Ceramic Primer were applied. One hundred thirty composite cement cylinders, comprising two dual-polymerizing (Variolink II and Panavia F) and two autopolymerizing (Rely X and Multilink) resins were bonded to the ceramic samples. A shear test was conducted, followed by an optical microscopy study to identify the location and type of failure, an electron microscopy study (SEM and TEM) and statistical analysis using the Kruskal-Wallis test for more than two independent samples and Mann-Whitney for two independent samples. Given the large number of combinations, Bonferroni correction was applied (α=0.001). Results: Dual-polymerizing cements provided better adhesion values (11.7 MPa) than the autopolymerizing (7.47 MPa) (p-value M-W<0.001). The worst techniques were Lava TM + sandblasting + Silane + Rely X; Lava TM + sandblasting + Silane + Multilink and Lava TM + CoJet + silane + Multilink. Adhesive failure (separation of cement and ceramic) was produced at a lesser force than cohesive failure (fracture of cement) (p-value M-W<0.001). Electron microscopy confirmed that the surface treatments modified the zirconium-oxide ceramic, creating a more rough and retentive surface, thus providing an improved micromechanical interlocking between the cement and the ceramic. Key words:Shear bond strength, silica coating, surface treatment, zirconia ceramics, phosphate monomer.

Shear bond strength of various luting cements to fixed prosthodontic restorative materials

“…Sandblasting increases the irregularity of the zirconium surface improving the interlocking with the cement (Fig. 5) [6]. However, ceramic surface etched with the hydrofluoric acid developes a micro-undercuts (Fig.…”

“…Studies showed considerable failure rates related to loss of retention when using waterbased cements and clinical evidence supports the importance of adhesive cementation for the long-term success of all-ceramic restorations and prostheses [6][7][8]. However, various authors suggested the use of water-based cements for zirconia ceramic restorations because they stated that higher fracture toughness of ZrO 2 decreased the risk of fracturing the all-ceramic crown and removal of excess phosphate cement was perceived as being easier than resin cements [9,10].…”

Bond strength of primer/cement systems to zirconia subjected to artificial aging

“…1B). 15 After SBS testing, the fractured interface was examined using stereomicroscopy (magnification ×20; Leica Microsystems). The dimensions of the resin stub that remained attached to the zirconia surface were measured from photographs by using imaging software (Image-Pro Plus; Media Cybernetics).…”

Fractographic study of the behavior of different ceramic veneers on full coverage crowns in relation to supporting core materials

“…The study set out, firstly, to classify the type of fracture produced (adhesive or cohesive) by means of stereomicroscope observation (9,10) and secondly, the form of fracture propagation in the contact area was observed using scanning electron microscope (SEM) fractography (11). Lastly, composition analysis was carried out in order to obtain more information about the processes involved in porcelain veneer fracture.…”