TY - JOUR ID - TI - The effect of plasma treatment on the bonding of soft denture liners to heat cured acrylic resin denture base material and on some surface properties of acrylic resin polymer AU - Shaymaa H. Masood شيماء مسعود AU - Salah A. Mohamed صلاح محمد PY - 2012 VL - 24 IS - 3 SP - 29 EP - 35 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Background: Acrylic resin polymers used in dentistry, are usually with problems in bonding, especially failure of thebond with soft denture lining materials. The aim of this study is to investigate the effect of plasma treatment on tensilebond strength, wettability and on physical surface changes for acrylic resin polymer.Materials and methods: Heat cured acrylic resin specimens with dimensions 8×10×30 mm were prepared for tensilebond strength test, in which each two acrylic specimens were joined by a 3-mm thick soft liner (Vertex Soft,Molloplast-B). Another heat curd acrylic resin specimens were prepared with dimensions 2×8×30 mm for wettabilitytest and physical surface analysis. For each test done in this study, the specimens were grouped as control, oxygenplasma treated and argon plasma treated acrylic specimens.Results: Plasma treatment increased the tensile bond strength for both Vertex and Molloplast-B soft lining materials,also induced a decrease in water contact angle values (i.e., increase in wettability) for oxygen and argon plasmatreated groups compared with control group, with highly significant difference (P <0.01) among groups. AFM imagesshowed a collection of new distinct nanograins and numerous grooves (pitlike-structures) after oxygen and argonplasma treatment with argon plasma treatment showed more new nanograins, deepest grooves and highestprotuberances which increased the surface-roughness (i.e. nano-roughness) when compared with control andoxygen plasma treated groups.Conclusion: Plasma treatment was an effective method for increasing tensile bond strength, wettebility, and inducedphysical topographical surface changes that increased the surface roughness(mainly after argon plasmatreatment) for plasma treated heat cured acrylic resin specimens

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