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.
Purpose
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).
Results
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).
Conclusions
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)
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© 2008 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
