Statement of problem
Mechanical properties of denture acrylic resins are important for the clinical success of multiple types of prostheses. Acrylic resins must be strong and resilient so as to withstand impact. Few studies utilize cyclic loads to characterize material response to repeated stress.
The purpose of this study was to evaluate static and dynamic flexure properties of a variety of acrylic resins utilized in the fabrication of prostheses: (1) heat-polymerized polymethyl methacrylate (PMMA), powder-liquid type, and (2) a newly introduced, visible light-polymerized urethane dimethacrylate dough type.
Material and methods
Twenty rectangular bars each of 4 PMMA acrylic resin materials (Diamond D, Fricke HI-I, Lucitone 199, Nature-Cryl Hi-Plus) and 1 urethane dimethacrylate (Eclipse) were fabricated and stored in 100% humidity for 30 days. Half of the specimens for each group were submitted to a static 3-point flexure test. The other half was submitted to cycling loading at 5 Hz for 104 cycles. Data were analyzed using 1-way ANOVA and 2-way ANOVA, followed by Tukey HSD or Bonferroni post hoc tests when necessary (α=.05).
Mean static flexure strength (SDs) in MPa were: Eclipse, 127.11 (5.83); Diamond D, 84.92 (5.10); Lucitone 199, 83.96 (11.96); HI-I, 79.54 (5.84); and Nature-Cryl Hi-Plus, 75.82 (6.96). Mean flexural strengths (SDs) in MPa postcycling were: Eclipse, 113.36 (31.29); Diamond D, 88.26 (5.46); Nature-Cryl Hi-Plus, 81.86 (4.93); HI-I, 79.18 (6.60); and Lucitone 199, 74.34 (4.95).
The visible light-polymerized urethane dimethacrylate resin (Eclipse) showed greater flexure strength than all PMMA heat-polymerized resins for both static and cycled groups (P<.001). Yet the Eclipse material had lower load limits, and demonstrated brittle-type behavior and greater standard deviations. The heat-polymerized PMMA materials did not significantly differ from each other after static or cyclic testing. (J Prosthet Dent 2008;100:47-51)
To read this article in full you will need to make a payment
Purchase one-time access:Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
One-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:Subscribe to Journal of Prosthetic Dentistry
Already a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
- Fatigue properties of acrylic denture base resins.Dent Mater J. 1989; 8: 243-259
- An investigation into the transverse and impact strength of “high strength” denture base acrylic resins.J Oral Rehabil. 2002; 29: 263-267
- Further development and evaluation of high impact strength denture base materials.J Dent. 1990; 18: 151-157
- Further observations on the high impact strength denture-base materials.Biomaterials. 1992; 13: 726-728
- Comparison of the fracture resistance of six denture base acrylic resins.J Biomater Appl. 2002; 17: 19-29
- The development of high impact strength denture-base materials.J Dent. 1986; 14: 214-217
- Comparison of fracture tests of denture base materials.J Prosthet Dent. 2003; 90: 578-585
- The staining characteristics, transverse strength, and microhardness of a visible light-cured denture base material.J Prosthet Dent. 1987; 57: 384-386
- Effect of water and artificial saliva on mechanical properties of some denture-base materials.Dent Mater. 1989; 5: 399-402
- Flexural strength and moduli of hypoallergenic denture base materials.J Prosthet Dent. 2005; 93: 372-377
- Comparative study of the transverse strength of three denture base materials.J Dent. 2007; 35: 930-933
- Flexural strength of heat-polymerized polymethyl methacrylate denture resin reinforced with glass, aramid, or nylon fibers.J Prosthet Dent. 2001; 86: 424-427
- Flexure fatigue of 10 commonly used denture base resins.J Prosthet Dent. 1981; 46: 478-483
- Fatigue failure in denture base polymers.J Prosthet Dent. 1969; 21: 257-266
International Standards Organization. ISO 1567:1999. Dentistry – denture base polymers. Geneva: ISO; 1999. Available at: http://www.iso.ch/iso/en/prods-services/ISOstore/store.html
- Effect of relining, water storage and cyclic loading on the flexural strength of a denture base acrylic resin.J Dent. 2006; 34: 420-426
- John Wiley & Sons, New York1993: 383-388 Failure of materials in mechanical design: Analysis, prediction, prevention. 2nd ed.
© 2008 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.