ABSTRACT
Problem statement A significant clinical concern in Co-Cr
alloy removable
prosthodontics is a failure of bonding with
acrylic resins and PEEK is introduced on various materials to overcome this problem. The reason for this study was to examine the
denture base acrylic resin bond strength to Co-Cr
alloy and PEEK
polymer using different surface
treatment. Materials and
method:
Total 60 number of disc-shaped specimens were prepared and divided into 2 main groups according to the type of framework material, 30 specimens for Co-Cr
alloy and 30 specimens for PEEK
polymer, which were then subdivided into 3 groups each one consist of 10 specimens, according to the type of surface
treatments. Each group either had a no surface
treatment (
control group) or
air abrasive group (110 μm of
alumina oxide) or
acid etch (98% sulfuric
acid) group. The specimens were thermocycled (3000 cycles) after applications of
heat cured
acrylic resin.
Results:
The results for Co-Cr
alloy showed that the
air abrasive surface
treatments had the highest bond strength mean value followed by the
control group (no surface
treatment), while the
acid surface
treatment had the least mean value of bond strength. For PEEK
polymer, the results revealed that the
acid surface
treatment had the highest value of bond strength followed by the
air abrasive surface
treatment while the
control group (no surface
treatment) had the least bond strength mean value.
Conclusion:
Air abrasive surface
treatment significantly improved bond strength for both Co-Cr and PEEK, while sulfuric
acid treatment show counterproductive result with Co-Cr
alloy whereas with PEEK
play an important
role in bonding mechanism. The use of PEEK framework in combination with
heat cured
acrylic resin can be recommended as a promising non-metallic alternatives framework material for removable of
partial dentures.