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

Abstract

Purpose: The objective of this study was to determine whether the addition of different types of boron (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 (65x10x2.5 mm), impact strength (50x6x4 mm), and hardness (20x6x4 mm) tests according to the manufacturers’ instructions (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 (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 (p=0,001). Furthermore, there was significant difference in hardness between control group and all other groups (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

References

1. 1. Rickman LJ, Padipatvuthikul P, Satterthwaite JD. Contemporary denture base resins: Part 1. Dent Update 2012; 39: 25-8.
2. 2. Gad MM, Fouda SM, Al-Harbi FA, Näpänkangas R, Raustia A. PMMA denture base material enhancement: a review of fiber, filler, and nanofiller addition. Int J Nanomedicine 2017; 17: 3801-12.
3. 3. Vallitlu PK. A rewiew of fiber reinforced denture base resins. J Prosthodontics 1996;5: 270-6.
4. 4. Kim SH, Watts DC. The effect of reinforcement with woven E-glass fibers on the impact strenght of complete dentures fabricated with-high-impact aciylig resin. J Prosthet Dent 2004; 91: 274-80.
5. 5. Jagger DC, Harrison A, Jandt KD. The reinforcement dentures. J Oral Rehabil 1998; 26: 185-94.
6. 6. Cökeliler D, Erkut S, Zemek J, Biederman H, Mutlu M. Modification of glass fibers to improve reinforcement: a plasma polymerization technique. Dent Mater 2007; 23: 335-42
7. 7. Franklin P, Wood DJ, Bubb NL. Reinforcement of poly(methyl methacrylate) denture base with glass flake. Dent Mater 2005; 21: 365-70.
8. 8. Kanie T, Arikawa H, Fujii K, Ban S. Flexural properties of denture base polymers reinforced with a glass cloth-urethane polymer composite. Dent Mater 2004; 20: 709-16.

9. 9. Lee HK, Zerbetto S, Colombo P, Pantano CG. Glass-ceramics and composites containing aluminum borate whiskers. Ceram Int 2010; 36: 1589-96
10. 10. Zhang X, Zhang X, Zhu B, Lin K, Chang J. Mechanical and thermal properties of denture PMMA reinforced with silanized aluminum borate whiskers. Dent Mater J 2012; 31: 903-8.
11. 11. Nkambule SM, Lowther JE. Crystalline and random “diamond-like” boron–carbon structures. Solid State Communic 2010; 150: 133–6.
12. 12. Roskill, “The Economics of Boron”, 9th edition, 1999.
13. 13. Akturk E, Bektas OO, Ozkanoglu S, Akin EGG. Do Ozonated Water and Boric Acid Affect the Bond Strength to Dentin in Different Adhesive Systems ? Niger J Clin Pract 2019; 22: 1758-64
14. 14. Prentice LH, Tyas MJ, Burrow MF. The effects of boric acid and phosphoric acid on the compressive strength of glass-ionomer cements. Dent Mater 2006; 22: 94-7.
15. 15. Revised American Dental Association specification no. 12 for denture base polymers. J Am Dent Assoc 1975; 90: 451–8.
16. 16. Schulzea KA, Marshalla SJ, Ganskyb SA, Marshalla GW. Color stability and hardness in dental composites after accelerated aging. Dent Mater 2003; 19: 612–19.
17. 17. Fraunhofer JA, Curtis PM Jr, Sharma S, Farmam AG. The effects of gamma radiation on the properties of composite restorative resins. J Dent 1989; 17: 177–83.
18. 18. Dogan DO, Ozguven Y, Karakus G, Sahin O, Polat NT, Yucel B, Dogan M. The effects of therapeutic x-ray doses on mechanical, chemical and physical properties of poly methyl methacrylate. Acta Odontologica Scandinavica, 2013; 71: 45–9.
19. 19.Akgul Ö, Acarali NB, Tugrul N, Derun EM, Piskin S. X-Ray, Thermal, FT-IR and morphological studies of zinc borate in presence of boric acid synthesized by ulexite. Periodico di Mineralogia 2014; 83: 77-88.
20. 20. Smith DC. Recent developments and prospects in dental polymers. J Prosthet Dent 1962; 12: 1066-78.
21. 21. Stafford GD, Smith DC. Flexural fatigue tests of some denture base polymers. Br Dent J 1970; 128: 442-5.
22. 22. Chander NG. Polymethyl metha acrylate denture base: An overview. J Indian Prosthodont Soc. 2018; 18: 87–8.
23. 23. Stafford GD, Bates JF, Hugget R, Handley RW. A review of the properties of some denture base polymers. J Dent 1980; 8: 292-306.
24. 24. Ruffino AR. Effect of steel strengtheners on fracture resistance of acrylic resin complete denture base. J Prosthet Dent 1985; 54: 75-8.
25. 25. Vallittu PK, Lassila VP. Reinforcement of acrylic resin denture base material with metal or fiber strengtheners. J Oral Rehabil 1992; 19: 225-30.
26. 26. Kumar GV, Nigam A, Naeem A, Gaur A, Pandey KK, Deora A. Reinforcing Heat-cured Poly-methyl-methacrylate Resins using Fibers of Glass, Polyaramid, and Nylon: An in vitro Study. J Contemp Dent Pract. 2016;17: 948-52.
27. 27. Rahamneh A, Jagger DC, Harrison A. The effect of the addition of different fibres on the transverse and impact strength of acrylic resin denture base material. Eur J Prosthodont Restor Dent 2003;11: 75-81.
28. 28. Yu SH, Lee Y, Oh S, Cho HW, Oda Y, Bae JM. Reinforcing effects of different fibers on denture base resin based on the fiber type, concentration, and combination. Dent Mater J. 2012; 31: 1039-46.
29. 29. ISO: Dentistry – Base polymers Part 1: Denture base polymers. 1st ed. Geneva, Switzerland: International Organization for Standardization, ISO 20795-1; 2008.
30. 30. Sağlam M, Köseoğlu S, Enhoş Ş. Boron in Periodontology. J of Health Sci 2013; 22: 70-75.
31. 31. Cengiz Ö, Kara A. Effects of boric acid addition on sintering behaviour of single-fired wall tile bodies. AKU- J Sci 2012; Special issue: 29-35.
32. 32. Bilgin AM, Gökmeşe H, Bostan B. Production of electro porcelain reinforced with boric acid and investigation of its properties. J Fac Eng Archıt Gaz 2015; 30: 577-83.
33. 33. Arora P, Singh SP, Arora V. Effect of alumina addition on properties of polymethylmethacrylate – a comprehensive review. Int J Biotech Trends Technol 2015; 9:1–7.
34. 34. Asar NV, Albayrak H, Korkmaz T, Turkyilmaz I. Influence of various metal oxides on mechanical and physical properties of heat-cured polymethylmethacrylate denture base resins. J Adv Prosthodont 2013; 5: 241–7.
35. 35. Ellakwa AE, Morsy MA, El-Sheikh AM. Effect of aluminum oxide addition on the flexural strength and thermal diffusivity of heat-polymerized acrylic resin. J Prosthodont 2008; 17: 439–44.
36. 36. Abdulhamed AN, Mohammed AM. Evaluation of thermal conductivity of alumina reinforced heat cure acrylic resin and some other properties. J Bagh Coll Dent. 2010; 22: 1–7.
37. 37. Vojdani M, Bagheri R, Khaledi AR. Effects of aluminum oxide addition on the flexural strength, surface hardness, and roughness of heat-polymerized acrylic resin. J Dent Sci 2012; 7: 238–44.
38. 38. Al-Harbi FA, Abdel-Halim MS, Gad MM, Fouda SM, et al. Effect of Nanodiamond Addition on Flexural Strength, Impact Strength, and Surface Roughness of PMMA Denture Base. J Prosthodont. 2019; 28: 417‐25.
39. 39. Dolmatov VY. Polymer-diamond composites based on detonation nanodiamonds: Part 2. J Superhard Mater 2007; 29: 65–75.