Comparison of Water Conditioning Effects on Hardness and Dimensional Stability of Methyl Methacrylate and Polyamide Denture Base Materials
Dimensional stability, Hardness, Polyamide, Poly-(methyl methacrylate), Water conditioning
Citation Information :
Elkholy S. Comparison of Water Conditioning Effects on Hardness and Dimensional Stability of Methyl Methacrylate and Polyamide Denture Base Materials. Int J Prosthodont Restor Dent 2018; 8 (4):114-119.
Aim: To evaluate the influence of water conditioning on the hardness and dimensional stability of polyamide denture material.
Materials and methods: The samples were conditioned in a water bath according to values of temperature (4° C and 43° C) and time (700 hours). To evaluate the hardness test, samples were fabricated from polyamide and heat cured acrylic resin materials and was divided into control, cold conditioning and hot conditioning groups and hardness were measured for all groups. For dimensional stability test, forty denture bases were divided into cold conditioning and hot conditioning groups. The gaps between the denture base and the cast were measured.
Results: The hardness of polyamide denture material was significantly decreased after hot water conditioning. Heat cured acrylic resin showed a significant increase in dimensional changes regarding cold water conditioning test.
Conclusion: Water conditioning at 43° C could decrease hardness and increase the flexibility of polyamide denture material. Water conditioning at 4° C could increase in dimensional instability of heat cure poly (methyl methacryolate) (PMMA) denture material.
Clinical significance: Use of dimensionally stable denture materials under the hot and cold condition are very important to retain the denture.
The Glossary of Prosthodontic Terms: Ninth Edition. J Prosthet Dent. 2017; 17(5S):e1-e105.
Feldman D. Polymer history. Designed monomers and polymers. 2008;11(1):1-15.
Vojdani M, Giti R. Polyamide as a denture base material: A literature review. J Dent Shiraz Univ Med Sci. 2015;16(1):1-9.
Deguchi R. Polyamide 6. Japan Plastics 1990;41:35-41.
Watt DM. Clinical assessment of nylon as a partial denture base material. Br Dent J 1955;98:238-244.
Okoyama N, Machi H, Hayashi K, Uchida T, Ono T, Nokubi T. Physical properties of polyamide resin (nylon group) as a polymeric material for dentures: Part 2. Surface hardness and tensile strength. J Nippon Acad Dent Technol. 2004;25:87-92.
Garbarski J, Fabijanìski M. The effect of conditioning upon the mechanical properties of polyamide. Adv Manufac Sci Tech. 2015;39(2):61-69.
Gale MS, Darvell BW. Thermal cycling procedures for laboratory testing of dental restorations. J Dent. 1999;27(2):89-99.
Engelen L, de Wijk RA, Prinz JF, van der Bilt A, Janssen AM, Bosman F. The effect of oral temperature on the temperature perception of liquids and semisolids in the mouth. Eur J Oral Sci. 2002;110;6:412-416.
Yunus N, Rashid AA, Azmi LL, Abu-Hassan MI. Some flexural properties of a nylon denture base polymer. J Oral Rehabil 2005;32(1):65-71.
Parvizi A, Lindquist T, Schneider R, Williamson D, Boyer D, Dawson DV. Comparison of the dimensional accuracy of injection-molded denture base materials to that of conventional pressure-pack acrylic resin. J Prosthodont. 2004;13(2):83-89.
Ucar Y, Akova T, Aysan I. Mechanical properties of polyamide versus different PMMA denture base materials. J Prosthodont 2012;21(3):173-176.
Moalli J. Plastics Failure Analysis and Prevention. William Andrew; 2001 Dec 31. P 9-6.
Aly AA, Zeidan EB, Hamed AM, Ali WY. Effect of heat treatment on the abrasion resistance of thermoplastic polymers. J Egypt Soc Tribol. 2010;7(4):52-64.
Crank J, Park GS. Diffusion in Polymers, Academic Press, New York, 1968;452.
Rogers CE. Permeation of gases and vapours in polymers. In Polymer permeability 1985 (pp. 11-73).
Takabayashi Y. Characteristics of denture thermoplastic resins for non-metal clasp dentures. Dent Mater J 2010;29:353-361.
Thomason JL, Porteu G. Swelling of glass-fiber reinforced polyamide 66 during conditioning in water, ethylene glycol, and antifreeze mixture. Plast Comp. 2011;32(4):639-647.
Goiato MC, dos Santos DM, Dekon SF, Okida RC. Influence of storage period and effect of different brands of acrylic resin on the dimensional accuracy of the maxillary denture base. Braz Dent J. 2008;19(3):204-208.
Chen JC, Lacefield WR, Castleberry DJ. Effect of denture thickness and curing cycle on the dimensional stability of acrylic resin denture bases. Dent Mater. 1988;4(1):20-24.
Shah J, Bulbule N, Kulkarni S, Shah R, Kakade D. Comparative evaluation of sorption, solubility and micro-hardness of heat cure polymethylmethacrylate denture base resin and flexible denture base resin. J Clin Diagn Res. 2014;8(8):ZF01– ZF04.
Yannikakis S, Zissis A. A clinical 5-year longitudinal study on the dimensional changes of complete maxillary dentures. Int J Prosthodont. 2003;16(1):78-81.
Oh W, May KB. Two stage technique for optimum fit and stability of light-polymerized record bases. J Prosthet Dent. 2008;99(5):410-411.
Takamata T, Setcos JC. Resin denture bases: review of accuracy and methods of polymerization. Int J Prosthodont. 1989;2(6):555-562.
Sykora O, Sutow EJ. Posterior palatal seal adaptation: influence of processing technique, palate shape and immersion. J Oral Rehabil. 1993;20(1):19-31.