ผลของสารปรับสภาพพื้นผิวที่มีต่อความแข็งแรงพันธะเฉือนระหว่างเรซินเสริมฐานแบบแข็งชนิดบ่มด้วยตัวเองและฐานฟันเทียมเรซินอะคริลิก ชนิดบ่มด้วยความร้อน / รัชนี โอสถานนท์ = The effect of chemical surface treatments on the shear bond strength between self cured hard reline resins and a heat cured acrylic resin denture base / Rachanee Osathananda
This research has the objective to study the effect of the denture base surface treatment, before reline denture, with methyl formate-methyl acetate solutions in many ratio on shear bond strength (SBS). One hundred twenty heat cured acrylic resin denture base in PVC tube were prepared and divided into twelve groups: according to three self cured hard reline resins (Unifast trad®, Tokuyama® RebaseII Fast ®, Ufi gel hard®), each product were devided into four subgroups according to surface treatment agents, adhesive agent according to manufacturer recommendation, methyl formate-methyl acetate solution at ratio 35:65, 25:75, 15:85 for 15 second respectively. The shear bond test was measured by the Instron Universal Testing Machine. Mode of failure was analyzed with Stereo Microscope. The mean SBS in groups of treatment surface with methyl formate-methyl acetate solutions at ratio 25:75, were relined with Unifast trad®, were significantly increased than that of adhesive agent according to manufacturer’s recommendation. Ufi gel hard® that treatment surface with methyl formate-methyl acetate solutions were significantly increased. The mean SBS of all groups of Tokuyama® RebaseII Fast were not significantly different. In conclusion, surface treatment with methyl formate-methyl acetate solution at ratio 25:75 enhanced more SBS in the denture base resin and Unifast Trad®, and these at all ratio enhanced more SBS between denture base resin and Ufi gel hard® than that treated with adhesive agents according to manufacturer recommendation.
