Evaluation of sunlight stability of polyurethane elastomers for maxillofacial use. II

Chu, Chengzhen; Fischer, T.E.

doi:10.1002/jbm.820130613

Cited by 14 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 Several research studies conducted over the past 3 decades have evaluated the color stability of maxillofacial prosthetic materials. [1][2][3][4][5][6][7][8][9][10][11][12][13] In 1995, Beatty et al 11 studied the color changes produced in unpigmented and pigmented silicone A-2186 after exposure to ultraviolet light. The results of recent studies by Haug et al 13 evaluating the effects of weathering on the color stability of 3 elastomers (including silicone A-2186) and 6 colorants supported the hypothesis that opacifiers can protect silicone elastomers from color degradation.…”

confidence: 99%

See 1 more Smart Citation

Effect of opacifiers on color stability of pigmented maxillofacial silicone A‐2186 subjected to artificial aging

Kiat-amnuay

Lemon

Powers

2002

Journal of Prosthodontics

View full text Add to dashboard Cite

Mixing dry earth cosmetic pigments with opacifiers did not protect silicone A-2186 from color degradation over time, especially in the case of red pigment. The group in which pigments were mixed with 10% Artskin white had the smallest color changes over time, followed by, in order, the groups in which pigments were mixed with 10% dry pigment titanium white, 10% kaolin powder calcined, and 5% Georgia kaolin. Red pigment had a significant effect on all opacifiers, especially Georgia kaolin and kaolin powder calcined. Yellow ochre and burnt sienna had an effect only on 15% kaolin powder calcined. Among all the pigment groups tested, yellow ochre remained the most color stable over time.

show abstract

confidence: 99%

“…Several research studies conducted over the past 3 decades have evaluated the color stability of maxillofacial prosthetic materials 1‐13 . In 1995, Beatty et al 11 studied the color changes produced in unpigmented and pigmented silicone A‐2186 after exposure to ultraviolet light.…”

mentioning

confidence: 99%

Effect of opacifiers on color stability of pigmented maxillofacial silicone A‐2186 subjected to artificial aging

Kiat-amnuay

Lemon

Powers

2002

Journal of Prosthodontics

View full text Add to dashboard Cite

show abstract

“…Generally, organic absorbers, such as UV-531, UV-327, Tinuvin series, etc., are most commonly used to prevent the yellowing of polymers by absorbing UV radiation energy. 42,43 To mitigate yellowing of polymers, 1H,1H,2H,2H-perfluorooctanol and nanocrystalline cellulose with well-deserved environmental compatibility and biodegradability were found to be introduced into PU to improve their yellowing resistance, 44,45 but it has very little effect and faces higher cost.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Synthesis of Silicon Quantum Dots with Highly Efficient Full-Band UV Absorption and Their Applications in Antiyellowing and Resistance of Photodegradation

Sun

Xie

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

UV absorbers are very effective in the fields of antiyellowing, resistance of photocatalytic degradation, and sunscreen cosmetics. However, commercialized UV absorbers have the drawbacks of toxicity, low absorption efficiency, transparency, etc. Here, we report for the first time silicon quantum dots as full-band UV absorbers. The NH-refunctionalized silicon quantum dots with high-performance UV absorption were successfully synthesized under the synergistic effect of sodium citrate and ethanediamine, and the (NH, OH)-functionalized silicon quantum dots (SiQDs) with full-band UV absorption can be achieved by reregulating −NH2 and −OH groups on the surface. The as-prepared (NH, OH)-functionalized SiQDs exhibited good stability and underwent treatment of varying pH and temperature. Furthermore, experimental results demonstrated that compared to commercial water-soluble organic UV absorbers, the (NH, OH)-functionalized SiQDs showed better antiyellowing performance for polyurethane and resistance of photocatalytic degradation for rhodamine B, and presented huge application potential in sunscreen cosmetics. Finally, the UV absorption mechanism of SiQDs was explained to be mainly related to Γ → Γ direct band gap transition, which absorb UV light and release it as thermal radiation.

show abstract

“…It is used in orthodontic adhesives and dental restorations as well as in polyurethane elastomers for 66 COSMETIC INGREDIENT REVIEW maxillofacial use (Randklev 1981;Berg 1979;Schmitz 1980;Engel 1981;Chu 1978).…”

Section: Noncosmeticmentioning

confidence: 99%

Amended Final Report of the Safety Assessment of Drometrizole as used in Cosmetics1

2008

Int J Toxicol

View full text Add to dashboard Cite

Drometrizole is used in cosmetics as an ultraviolet (UV) light absorber and stabilizer. In an earlier safety assessment, the available data were found insufficient to support the safety of this ingredient, but new data have been provided and assessed. In voluntary industry reports to the Food and Drug Administration, this ingredient is reported to be used in noncoloring hair care products, and in an industry use concentration survey, uses in nail care products at 0.07% were reported. Drometrizole has absorbance maxima at 243, 298, and 340 nm. Drometrizole is used widely as a UV absorber and stabilizer in plastics, polyesters, celluloses, acrylates, dyes, rubber, synthetic and natural fibers, waxes, detergent solutions, and orthodontic adhesives. It is similarly used in agricultural products and insecticides. Drometrizole is approved as an indirect food additive for use as an antioxidant and/or stabilizer in polymers. Short-term studies using rats reported liver weight increases, increases in the activities of enzymes aminopyrine N-demethylase, and UDP glucuronosyl transferase, but no significant effects were noted in the activities of acid hydrolases or in hepatocyte organelles. Although Drometrizole is insoluble in water and soluble in a wide range of organic solvents, a distribution and elimination study using rats indicated that some Drometrizole was absorbed, then metabolized and excreted in the urine. Drometrizole and products containing Drometrizole were nontoxic in acute oral, inhalation, and dermal studies using animals. No increase in mortality or local and/or systemic toxicity were observed in a 13-week oral toxicity study using dogs; the no observed effect level (NOEL) was 31.75 mg/kg day(- 1) for males and 34.6 mg/kg day(-1) for females. In a 2-year feeding study using rats, a NOEL of 47 to 58 mg/kg day(- 1) was reported. Developmental studies of Drometrizole in rats and mice found no teratogenic effects and a NOEL of 1000 mg/kg day(- 1) was reported. Drometrizole was not genotoxic in Ames tests, a mouse bone marrow micronucleus test, or somatic mutation assays observing interphase nuclei and chromosomal aberrations using Chinese hamsters. There was no evidence of dominant lethal effects in studies using mice or rats. Drometrizole at a 1% concentration was minimally to moderately irritating to rabbit eyes, if followed by rinsing, but mildly to severely irritating in unrinsed eyes. A nail product containing 0.03% Drometrizole, however, was nonirritating to unrinsed rabbit eyes. A nail polish containing 1.0% Drometrizole was nonirritating to rabbit skin and Drometrizole was negative for sensitization in two Magnusson-Kligman maximization tests in guinea pigs. In clinical tests, Drometrizole at 1% was nonirritating in a single-insult patch test. No irritation or eczematous reactions were observed in 300 patients (with or without dermatosis) treated with daily applications of Drometrizole for 8 weeks. In a 3-year clinical therapeutic trial conducted to evaluate the effectiveness of two UV absorbing prepar...

show abstract

Evaluation of sunlight stability of polyurethane elastomers for maxillofacial use. II

Cited by 14 publications

References 7 publications

Effect of opacifiers on color stability of pigmented maxillofacial silicone A‐2186 subjected to artificial aging

Effect of opacifiers on color stability of pigmented maxillofacial silicone A‐2186 subjected to artificial aging

Synthesis of Silicon Quantum Dots with Highly Efficient Full-Band UV Absorption and Their Applications in Antiyellowing and Resistance of Photodegradation

Amended Final Report of the Safety Assessment of Drometrizole as used in Cosmetics1

Contact Info

Product

Resources

About