J Adv Prosthodont.  2019 Feb;11(1):32-40. 10.4047/jap.2019.11.1.32.

Physical properties and color stability of injection-molded thermoplastic denture base resins

• Song SY
• Kim KS
• Lee JY
• Shin SW

• KMID: 2438929
• DOI: http://doi.org/10.4047/jap.2019.11.1.32

Abstract

PURPOSE
The purpose of this study was to compare mechanical and physical properties of injection-molded thermoplastic denture base resins.
MATERIALS AND METHODS
In this study, six commercially available products (VA; Valplast, LC; Lucitone, ST; Smiltone, ES; Estheshot-Bright, AC; Acrytone, WE; Weldenz) were selected from four types of thermoplastic denture base materials (Polyamide, Polyester, Acrylic resin and Polypropylene). The flexural properties and shore D hardness have been investigated and water sorption and solubility, and color stability have evaluated.
RESULTS
For the flexural modulus value, ES showed the highest value and WE showed significantly lower value than all other groups (P < .05). Most of experimental groups showed weak color stability beyond the clinically acceptable range.
CONCLUSION
Within the limits of this study, thermoplastic denture base resin did not show sufficient modulus to function as a denture base. In addition, all resins showed discoloration with clinical significance, and especially polyamides showed the lowest color stability.

Keyword

Thermoplastic denture base resins; Nonmetallic clasp dentures; Denture base polymers; Color stability; Flexural strength

MeSH Terms

Denture Bases*
Dentures*
Hardness
Nylons
Polyesters
Solubility
Water
Nylons
Polyesters
Water

Figure

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  Fig. 1 Three point bending strength test using universal testing machine (AGX-KN10, Shimadzu, Japan).

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  Fig. 2 Dial Durometer (GS-702N) & Durometer Stand (GS-615).

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