| Abstrakt: |
Introduction After post-delivery wounds, the most common reason for patients to return to dentists is due to the separation of artificial teeth from acrylic base of dentures. The purpose of this experimental study was to evaluate the shear strength of some common artificial teeth in the Iranian market. Material and Method 8 sets of 4 types (2 sets of each type) of different artificial teeth available and common in the Iranian market are prepared; including Finex (BetaDent co, Iran), "President" (Idealmakoo co, Iran), "Yamahachi" (Yamahachi co, Japan) and "Ivoclar" (Ivoclar Vivadent, Italy) used in removable dentures. 10 samples were prepared from each set. These samples were 4 * 2 * 2 mm3, which were prepared by CNC machine (Computer Numerical Control, Nemov CO, Iran).A total of 80 samples were prepared, which were mounted on two types of heat cure acrylics, including "Ivoclar" probase hot (Ivoclar Vivadent Liechtenstein) and "Acrosan" (BetaDent co, Iran) to compare the combined effect of acrylic base type and artificial teeth type. Lower surface of all artificial teeth samples were milled and then monomer applied. After mounting, all samples were subjected to 3000 load cycles and then the shear strength of artificial teeth samples mounted in heat-cured acrylics measured by using UTM (Universal Testing Machine,SANTAM Co., Iran). Results Mean and standard deviation of acrylic shear bond strength of artificial teeth from highest to lowest: in Ivocular artificial teeth 244.20 ± 25.96, in Yamahachi artificial teeth 221.00 ± 24.56, in Finex artificial teeth 179.8 ± 22.46 and in President artificial teeth were 150.33 ± 21.20.There is no interaction between artificial tooth brand and type of acrylic base (p = 0.111) but there is a significant difference between type of acrylic base and artificial tooth brand (P <0.001 for each).In every artificial tooth brands, the average of shear bond strength in Ivoclar acrylic base was significantly higher than Acrosan acrylic base. Also, in each type of acrylic bases, the highest average of shear bond strength was in Ivoclar artificial tooth brand and the lowest shear bond strength was in President artificial tooth brand. Conclusion The average of shear bond strength of Yamahachi artificial teeth was higher than Finex and President. According to findings, it seems use of Ivocular and Yamahachi artificial teeth respectively decreases the possibility of separation of artificial teeth from acrylic base. In every artificial tooth brands,the average of shear bond strength in Ivoclar acrylic base was significantly higher than Acrosan acrylic base. [ABSTRACT FROM AUTHOR] |
