Effect of 4-META adhesive on the bond strength of different metal framework designs and acrylic resins

Abstract

The effect of relining the 4-META adhesive resin onto metal alloy of a partial denture framework was tested. Seventy-two metal frameworks with three different retentive patterns were designed. Half of the specimens were treated with 4-META, the other group was left untreated. Thirty-six specimens were first divided into three groups in which 12 samples had different designs of retention, i.e. mesh, ring-shaped and flat plane. Then, each different retentive design was divided into two groups and in one group Lucitone 199 and the other QC acrylic resin were processed. Finally they were subjected to shear test. While samples with adhesive exhibited greater bond strength than the others, samples without adhesive may be ranked in the order mesh, ring-shaped and flat planes with regard to shear bond strength. In samples with adhesive, the flat plane ones displayed better results. Statistically significant differences were observed in the relationships between the groups.

Force Needed to Separate Acrylic Resin from Primed and Unprimed Frameworks of Different Designs

“…Mesh retention showed significantly higher mean separation forces than the lattice and smooth metal plate designs. This was consistent with Brown et al 3 and Canay et al, 33 who demonstrated that retentive mesh was more effective in retaining acrylic resin than the lattice design.…”

“…Cohesive bond failure in acrylic resin was observed more often among primed specimens, with the exception of mesh retentive specimens. Canay et al 33 also observed a cohesive shear bond fracture in the group treated with 4‐META and adhesive shear bond fracture in the untreated group.…”

“…Cohesive bond failure in acrylic resin was observed more often among primed specimens, with the exception of mesh retentive specimens. Canay et al 33…”

“…Each occurred with the primed lattice retention. The possibility of metal failure and deformation with the lattice design has been discussed by other authors (Brown et al, 3 Jacobson et al, 31 and Canay et al 33 ), who cautioned against its use due to its high susceptibility for permanent deformation.…”