The Effect of Plasma Treatment on the Bonding of a Soft Liner to CAD-CAM Denture Base Resin
Author(s): Lubna M Qanber*,* and Thekra I Hamad
Introduction: The primary issue with soft liners is their debonding from the denture base material after a period of usage. Aims: This study aims at evaluating the effect of oxygen and argon plasma treatment on the shear bond strength of soft liner material to CAD-CAM acrylic denture base. Materials and Methods: CAD-CAM acrylic specimens were prepared (n=20 pairs), with the dimensions (75 × 13 × 13 mm) length, width and thickness, respectively, with a 3 mm depth stopper. Ten pairs of specimens were plasma treated for 5 minutes. Then, heat-cured soft liner was added joining each two specimens. Shear bond strength (SBS) was then analyzed using universal testing machine. Vickers microhardness, contact angle, FTIR and AFM were also analyzed. The results were statistically analyzed using T-paired test (α=0.05). Results: The SBS of plasma treated samples were significantly higher than that of the untreated samples (p<0.001). Microhardness was not significantly affected, and contact angle got significantly higher following plasma treatment. Conclusion: Oxygen and argon plasma treatment has efficiently increased SBS between CAD-CAM acrylic and soft liner without affecting the material’s bulk properties.