Influence of polymerization cycle in properties of acrylic resin polymerized by microwave energy


  • Fabrício Mezzomo Collares Universidade Federal do Rio Grande do Sul
  • Carmen Beatriz Borges Fortes Universidade Federal do Rio Grande do Sul
  • Vicente Castelo Branco Leitune Universidade Federal do Rio Grande do Sul
  • Stefani Becker Rodrigues Universidade Federal do Rio Grande do Sul
  • Susana Maria Werner Samuel Universidade Federal do Rio Grande do Sul
  • César Petzhold Universidade Federal do Rio Grande do Sul
  • Vater Stefani Universidade Federal do rio Grande do Sul



Acrylic resins, Microwaves, Hardness test, Solubility


Objective: The purpose of this study was to evaluate the physicochemical properties of acrylic resin polymerized by microwave energy in short cycle of polymerization.
Methods: Two brands (Classico and VIPI) and two cycles were evaluated (manufacturer cycle and short cycle). The characteristics and properties as degree of conversion, glass transition temperature, impact strength-Izod, Knoop hardness, swelling degree, soluble fraction, specific mass, water sorption and solubility were evaluated.
Results: Glass transition temperature, hardness, specific mass, soluble fraction and solubility were statistically significant between cycles and brands (p<0.05). Water sorption showed no difference between cycles (p>0.05) and impact strength presented difference between brands in short cycle (p<0.05). Acrylic resin polymerized by microwave energy with manufacturer cycle presented no difference in physicochemical properties between evaluated brands. Conclusion: The short cycle of polymerization showed reduced properties in microwave acrylic resin when compared to manufacturer cycle. Manufacturer cycle of polymerization should be used to acrylic resin devices production.


Niishi MJ. Studies on the curing of denture base resins with microwave irradiation with particular reference to heat-curing resins. Osaka Dent 1968; 2:23-40.

Nevalainen MJ, Närhi TO, Ainamo A. Oral mucosa lesions and oral hygiene habits in the home-living elderly. J Oral Rehab 1997; 24:332-7. https://doi. org/10.1046/j.1365-2842.1997.d01-298.x

Silva CHL, Paranhos HFO, Ito IY. Evidenciadores de biofilme em prótese total: avaliação clínica e antimicrobiana. Pesqui Odontol Bras 2002; 16:270-5.

Barbachan JJD, Rados PV, Sant’Ana Filho M, Domingues MG. Estudo clínico da estomatite protética: avaliação preliminar. Rev Fac Odontol Porto Alegre 1995; 36:27-31.

Ilbay SG, Guvener S, Alkumru HN. Processing dentures using a microwave technique. J Oral Rehabil 1994; 21:103-9. https://doi. org/10.1111/j.1365-2842.1994.tb01129.x

Reitz PV, Sanders JL, Levin B. The curing of denture acrylic resins by microwave energy. Physical properties. Quintessence Int 1985; 16: 547-51.

Shlosberg SR, Goodacre CJ, Munoz CA, Moore BK, Schnell RJ. Microwave energy polymerization of poly(methyl methacrylate) denture base resin. Int J Prosthodont 1989; 2:453-8.

Tsuchiya H, Hoshino Y, Tajima K, Takagi N. Leaching and cytotoxicity of formaldehyde and methyl methacrylate from acrylic resin denture base materials. J Prosthet Dent 1994; 71:618-24.

Barbosa DS, Pero AC, Marra J, Compagnoni MA. Flexural polymerized by different strength of acrylic resins cycles. J Appl Oral Sci 2007; 15:424-8.

Compagnoni MA, Barbosa DB, de Souza RF, Pero AC. The effect of polymerization cycles on porosity of microwave-processed denture base resin. J Prosthet Dent 2004; 91:281-5. prosdent.2004.01.006

ISO 1567:1999 Dentistry- Denture Base Polymers. Switzerland; 1999.

Shin, W. S., Li, X. F., Schwartz, B., Wunder, S L., & Baran, G. R. Determination of the degree of cure of dental resins using Raman and FT-Raman spectroscopy. Dental Materials 1993; 9:317-24. https://doi. org/10.1016/0109-5641(93)90050-Z

ASTM-International. American society for testing and materials. D 256 Izod Impact. United States of America. 1998.

ASTM-International. American society for testing and materials. IN 153 Density. United States of America. 1998.

Keller JC, Lautenschlager EP. Porosity reduction and its associated effect on the diametral tensile strength of activated acrylic resins. J Prosthet Dent 1985; 53:374-9.

Anseth KS, Bowman NC. Kinetic gelation model predictions of crosslinked polymer network microstructure. Chem Eng Sci 1994; 49:2207-17.

Tamareselvy K, Rueggeberg FA. Dynamic mechanical analysis of two crosslinked copolymer systems. Dent Mater 1994; 10:290-7. https://doi.







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