The Effect of Denture Base Repair with Special Type of Acrylic O-Cry1 and Different Surface Treatments on Impact Bond Strength of Acrylic Resin (Comparative Study)

Background: the common problem in prosthodontics is a fracture of the denture base and it represents an annoyance for the dentists. Therefore, the option of increasing repair strength using new reinforcement materials is of great interest to prosthodon- tists. The purpose of this study was to assess the effects of using a special type of acrylic o-cry1 in repair instead of heat cure acrylic resins and different surface treatments on impact bond strength using Ivomet and conventional curing methods. Materials and Methods: One hundred thirty specimens of heat acrylic resins were constructed. There are 2 main groups accord- ing to curing methods (Ivomet and conventional method curing). For each group, there were 6 groups according to the surface treatments used (untreated, monomer, thiner, zirconium oxide, glass fiber and butt joint with monomer) as well as control group. Results: The study showed that the control group had a higher value of impact strength than other groups which were cured by conventional method. For Ivomet curing, the butt joint with monomer and glass fiber groups improved the impact bond strength in comparison to other groups. Conclusion: the butt joint with monomer treatment and glass fiber groups have improved the impact strength of the repaired acrylic resins when using Ivomet compared with other groups. On the other hand, the use of thiner and zirconium oxide reduced the impact bond strength when using the conventional curing method. The use of Ivomet device in curing samples improved the impact strength of acrylic repaired with O-cry1.