Effect of plasma treatment on the bond of soft denture liner to conventional and high impact acrylic denture materials

Abstract

Background: The main drawback of soft lining materials was that they debonded from the denture base after a certain period of usage. Therefore, the purpose of this research was to determine the impact of oxygen and argon plasma treatment on the shear bonding strength of soft liners to two different kinds of denture base materials: conventional acrylic resin and high impact acrylic resin. Materials and Methods: Heat cure conventional and high impact acrylic blocks (40 for each group) were prepared. A soft liner connected the final test specimen of two blocks of each acrylic material. Shear bond strength (SBS) was assessed using universal testing machine. Additional blocks were also prepared for analyzing Vickers microhardness, contact angle, FTIR and AFM. The results were statistically analyzed using paired-sample T-test and independent-samples T-test (α=0.05). Results: The results showed a highly significant increase in SBS following plasma treatment with the highest mean value observed in plasma treated high impact acrylic specimen. Along with a significant rise in wettability, while microhardness was preserved. Conclusion: In conclusion, oxygen and argon plasma treatment was significantly effective in enhancing the SBS between soft liner and acrylic materials.

Effect of plasma surface treatment of three different CAD/CAM materials on the micro shear bond strength with resin cement (A comparative in vitro study)

“…Nine additional specimens were prepared from each material to be used for wettability testing. The sessile drop method was used to measure the wettability of each CAD/CAM material, whereby a drop of distilled water was dispensed at the surface of the material at room temperature, then the contact angle was measured after 10 s using an Optical Tensiometer (TL 1000, Theta Lite, OneAttension, Biolin Scientific, Lichfield, UK) [ 23 , 31 ]. For each material, three specimens were used (n = 3) and the contact angle was measured at three times:…”

The Effect of Microwave Irradiation and Some Denture Cleansers on The Bond Strength of Soft Liner to CAD/CAM-Milled Acrylic Resin

“…After wax elimination and removal of the spacer, the CAD/CAM-based acrylic samples were bonded with each other by a soft liner (Vertex-Soft, Netherlands) that was mixed in a glass jar according to the manufacturer's guidelines (1ml liquid to 2g powder), and incrementally packed into the space between the acrylic blocks by a clean metal mixing spatula, the flask was then enclosed under pressure and put in a water bath for curing depending on the manufacturer's recommendation (70 ºC for 1.5 hours, then 100 ºC for 30 minutes), the conventional flasking and packing procedures were followed in the processing of the sample (9). After a bench cooling for 20 minutes at room temperature (10), The samples were removed from the mold, and the unwanted margins were removed by a surgical blade (11). All of the samples were classified into 5 groups based on multiple disinfection procedures used.…”

The Effect of Various Disinfection Methods on The Tensile Bond Strength of Soft Lining Material

“…After curing of resin (as a manufacturer's information) the spacer was removed. Then a soft liner (Vertex-Soft, Netherlands) was mixed according to the manufacturer's guidelines in a dry glass jar and packed in between the resin blocks, the two halves (upper and lower) of the flask were closed, and to confirm even flow of the resilient liner, the hydraulic press was applied gradually for 5 minutes, after which the press was stopped, and the clamped flasks were transmitted to the water path for soft liner curing which based on manufacturer recommendations (70 ºC for 1.5 hours, and then 100 ºC for 30 minutes), the conventional flasking and packing procedures were followed in the processing of the sample (8), then the flask was unlocked and the specimens were taken out and finished by cutting any excess with a sharp blade (9). All of the specimens were split into five categories depending on their disinfection procedures.…”