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Color stability of facial prostheses
J C Lemon1, M S Chambers, M L Jacobsen
1Oncologic Dentistry and Prosthodontics, University of Texas, Houston, USA.
The Journal of Prosthetic Dentistry
|December 1, 1995
Summary
Facial prostheses degrade over time, leading to color instability. An additive, broad-spectrum ultraviolet light absorber (UV-5411) was tested but did not prevent color changes in pigmented facial elastomers during weathering.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Polymer Chemistry
Background:
- Facial prostheses are crucial for patients but suffer from limited service life.
- Degradation of elastomers and color instability are primary failure modes.
- Environmental factors like humidity and UV exposure contribute to material deterioration.
Purpose of the Study:
- To evaluate the effectiveness of an intrinsic, broad-spectrum ultraviolet light absorber (UV-5411) in improving the color stability of pigmented facial elastomers.
- To assess the impact of artificial and outdoor weathering on elastomer color.
Main Methods:
- Pigmented facial elastomer samples were prepared with and without the UV-5411 additive.
- Samples underwent artificial weathering and outdoor exposure simulating environmental conditions.
- Radiant energy exposure levels ranged from 150 to 450 kJ/m².
- Color changes were assessed perceptibly after exposure.
Main Results:
- All tested samples exhibited slight but perceptible color changes after weathering.
- Artificial aging resulted in more significant color changes compared to outdoor aging.
- The inclusion of the UV-5411 additive did not provide protection against color degradation.
Conclusions:
- The tested broad-spectrum ultraviolet light absorber (UV-5411) is ineffective in preventing color instability in pigmented facial elastomers.
- Further research is needed to identify effective stabilizers for facial prosthesis materials to enhance longevity and aesthetic maintenance.