Effects of boron on the mechanical properties of polymethylmethacrylate denture base material

Authors : Ali Kemal ÖZDEMİR, Hakan DEMİR, Derya ÖZDEMİR DOĞAN, Faik TUĞUT, Hakan AKİN

Pages : 45-53

View : 22 | Download : 6

Publication Date : 2021-01-30

Article Type : Research Paper

Abstract :Purpose: The objective of this study was to determine whether the addition of different types of boron insert ignore into journalissuearticles values(Borax, Boric Acid and Colemanite); to polymethyl methacrylate denture base resin would improve flexural and impact strengths, and surface hardness of polymethyl methacrylate. Materials and Methods: Borax, Boric acid, Colemanite were added to heat polymerized polymethyl methacrylate specimens were prepared for flexural strength insert ignore into journalissuearticles values(65x10x2.5 mm);, impact strength insert ignore into journalissuearticles values(50x6x4 mm);, and hardness insert ignore into journalissuearticles values(20x6x4 mm); tests according to the manufacturers’ instructions insert ignore into journalissuearticles values(n=10);. To determine flexural strength of the specimens, they were loaded until failure on a universal testing machine using a three point bending test. Specimens were subjected to the Charpy impact test machine. Hardness of the specimens was measured with an analog shoremeter Shore D. The data were analyzed with Kruskal-Wallis and Mann-Whitney U tests insert ignore into journalissuearticles values(α=0.05);. Results: The highest mean flexural strength value was seen in 3% Borax group and followed by 1% Colemanite group. In addition, the highest mean impact strength value was recorded in 1% Colemanite group, and differences between 1% Colemanite group and control group were found to be statistically significant insert ignore into journalissuearticles values(p=0,001);. Furthermore, there was significant difference in hardness between control group and all other groups insert ignore into journalissuearticles values(p<0.001);. Conclusion: The addition of 1% Colemanite to polymethyl methacrylate improved the mechanical properties of PMMA.
Keywords : Polymethyl methacrylate, Boron, Flexural strength, Impact strength, Surface hardness