EFFECT OF 4-META ADHESIVE ON THE BOND STRENGTH OF DIFFERENT METAL FRAMEWORK DESIGNS AND ACRYLIC RESINS

The effect of relining the 4-META adhesive resin onto metal allay of a partial denture framework was tested. Seventy-two metal frameworks wi th three different retentive patterns were designed. Half of the speci mens were treated with 4-META, the other group was left untreated. Thi rty-six specimens were first divided into three groups in which 12 sam ples had different designs of retention, i.e. mesh, ring-shaped and fl at plane. Then, each different retentive design was divided into two g roups and in one group Lucitone 199 and the other QC acrylic resin wer e 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 fla t planes with regard to shear bond strength. In samples with adhesive, the flat plane ones displayed better results. Statistically significa nt differences were observed in the relationships between the groups.