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. 2014:2014:150298.
doi: 10.1155/2014/150298. Epub 2014 Mar 9.

Physical properties of polyamide-12 versus PMMA denture base material

Mieszko Wieckiewicz  1 , Volker Opitz  2 , Gert Richter  2 , Klaus W Boening  2
Affiliations

Physical properties of polyamide-12 versus PMMA denture base material

Mieszko Wieckiewicz et al. Biomed Res Int. 2014.

Abstract

Objectives: Polyamide-12 (PA) is a flexible material suited for denture bases and clasping. This study investigated its potential aging effects with a focus on surface roughness, color stability, and elasticity.

Methods: PA specimens (Valplast) of 40×10×2 mm and equally measuring PMMA specimens (Palapress) as control were fabricated. Color changes after storage in air, water, coffee, and red wine (n=10) were measured using the CIE L*a*b* color specification. Elasticity after thermocycling (1000, 3000, and 7000 cycles, n=15) was measured by three-point bending testing. Mean surface roughness (Ra) was determined after storage in the liquids mentioned above and thermocycling (n=10).

Results: Tukey's HSD test (P<0.05) revealed statistically significant color changes of PA in red wine (ΔE=4.27 after 12 days, ΔE=6.90 after 12 days) and coffee (ΔE=3.93 after 36 days) but no color changes in PMMA. Elastic modulus of PA was 845 MPa and not affected by thermocycling (Tukey's HSD test, P>0.81). Dry specimens showed significantly decreased elasticity (P<0.001). Mean surface roughness (PA 0.20 μ m, PMMA 0.28 μ m) did not change significantly after thermocycling or storage (Mann-Whitney U-test, 0.16<P<0.65).

Significance: PA exhibited a higher susceptibility to discoloration than PMMA. Neither surface roughness nor elasticity of PA was altered by artificial aging.

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Figures

Figure 1
Figure 1
Upper jaw with missing central and lateral incisors in the second quadrant and large defect of the alveolar ridge.
Figure 2
Figure 2
Removable partial denture with denture saddles and retentive clasping arms made from polyamide-12. The conventional CoCrMo framework ensures rigidity of the denture despite the flexibility of the denture resin material.
Figure 3
Figure 3
Removable partial denture in situ. The polyamide-12 retentive clasping arms are almost invisible.
Figure 4
Figure 4
Three-point bending test to determine the modulus of elasticity in polyamide-12 specimens. L: support span (30 mm), b: specimen width (10 mm), d: specimen thickness (2 mm), and crosshead speed 1.0 mm/min (corresponding equation in the text).
See this image and copyright information in PMC

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