Color changes in dry-pigmented maxillofacial elastomer resulting from ultraviolet light exposure

Beatty, Mark W.; Mahanna, Gordon K.; Dick, Kurt; Jia, Wenyi

doi:10.1016/s0022-3913(05)80351-8

Cited by 68 publications

(74 citation statements)

References 10 publications

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“…The minute colour difference was not perceived in the visual assessment, with all the assessors consistently assigning the ''same colour'' score of ''3'' for both control samples (Figure 3). Based on current literature, the human eye is able to detect or perceive a colour difference between two juxtaposed objects only when the DE value between them is greater than 1 unit (Wypych 1995;Beatty et al 1995;Leow et al 2002). This is referred to as visually perceptible colour difference.…”

Section: Methods Errormentioning

confidence: 99%

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Assessment of Colour Differences in Silicone Hand and Digit Prostheses

Leow

Lee

et al. 2006

Prosthetics &Amp; Orthotics International

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This study addresses the dilemma of initial clinical and social acceptance of a newly fabricated silicone prosthesis in relation to its colour match to the natural skin. This was achieved by derivation of specific colour difference thresholds defining perceptible and acceptable levels of colour sensitivity. Two separate sets of 10 fair and dark shade digit prosthesis samples were each fabricated with a stepped increase in colour difference (DE) against the baseline hand prosthesis. Ninety individuals with normal colour vision scores were selected as colour assessors. The colour difference of each prosthesis in the two series was evaluated visually against the baseline by the assessors, using defined scores. The thresholds for perceptible and acceptable colour difference determined in this study were DE ¼ 0.8 and DE ¼ 1.8 for the fair series and DE ¼ 1.3 and DE ¼ 2.6 for the dark series, respectively. The acceptable threshold values differed from the perceptible threshold values by DE ¼ 1.0 for the fair-shade samples and DE ¼ 1.3 for the dark-shade samples. This study demonstrated that subjective visual assessment is positively correlated with DE values computed from colorimetric measurements for both fair and dark-shade silicone samples (p50.001). This results shows that human subjects with normal colour vision are capable of accurately assessing colour differences. These observations emphasize the importance of subjective feedback on colour by the patient, provided the latter has perfect colour-tested vision. The study also showed that human subjects were less sensitive to perceived colour differences in darker-shade than fairer-shade samples (p50.001). This finding seems relevant in a clinical setting involving a multi-ethnic patient population.

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Section: Methods Errormentioning

confidence: 99%

“…A colour difference (DE) between a given digit prosthesis sample and its respective baseline hand prosthesis was calculated using the following colour difference equation (Wypych, 1995; Beatty et al 1995;Leow et al 1997Leow et al , 1999:…”

Section: Computation Of Colour Differencementioning

confidence: 99%

Assessment of Colour Differences in Silicone Hand and Digit Prostheses

Leow

Lee

et al. 2006

Prosthetics &Amp; Orthotics International

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“…4,9,10,12 The instability of observed color is attributed to the constant exposition to ultraviolet (UV) light, air pollution, pigment additions, 3,4,[13][14][15][16][17][18][19] and the use of cleansing products. 9,11,20,21 Literature has shown that intrinsic addition of opacifiers to facial silicones promoted longer color maintenance. [17][18][19] Among the opacifiers commercially available, Barium sulfate (BaSO 4 ) is mentioned.…”

Section: Introductionmentioning

confidence: 99%

Color stability of maxillofacial silicone with nanoparticle pigment and opacifier submitted to disinfection and artificial aging

et al. 2011

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“…Furthermore, the patient may view the prosthesis as a mask and not a part of his or her body. It is reported that 12% of patients who receive ear, nose, eye, and cheek prostheses using silicone materials never wear them [13], and there are numerous reports of dissatisfaction with the aesthetics, color stability, function, or longevity of prostheses [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%