Influence of different disinfecting solutions on the color change of artificial irises used in ocular prostheses

Abstract

Making an artificial iris with an aesthetically acceptable color is an important aspect of ocular rehabilitation. This work evaluated the influence of different disinfecting solutions on changes to the color of artificial irises used in ocular prostheses. Fifty samples simulating ocular prostheses were produced with cobalt blue artificial irises and divided (n = 10) according to the disinfectant used: neutral soap, Opti‐free, Efferdent, 1% hypochlorite, and 4% chlorhexidine. The samples were disinfected for 120 days and subjected to a color readings by spectrophotometry, using the CIE L*a*b* system, before the disinfection period (B), after 60 days of disinfectant exposure (T1), and after 120 days of disinfectant exposure (T2). Color differences (ΔE) were calculated for the intervals between T1 and B (T1B), and between T2 and B (T2B). The data were evaluated by analysis of variance and the Tukey Honestly Significantly Different (α = 0.05). All disinfectant groups exhibited color changes. The mean color change observed for all groups overall during T2B (ΔE = 3.51) was significantly greater than that observed during T1B (ΔE = 2.10). All groups exhibited greater color change for the b* values when compared to the a* and L* values. There were no significant differences between the disinfectant groups. It can be concluded that the time period of disinfection and storage significantly affected the stability of artificial iris color, independent of the disinfectant used. © 2012 Wiley Periodicals, Inc. Col Res Appl, 39, 56–62, 2014

Chromatic changes to artificial irises produced using different techniques

“…Chromatic and whiteness/brightness changes were evaluated by refraction spectrophotometer (UV-2450; Shimadzu Corp, Kyoto, Japan), with wavelength ranging from 780 (at the beginning) to 380 (at the end); and color changes being calculated according to the International Commission on Illumination (CIE) standards using the L*a*b* system with the standard illuminant D65. 2,[11][12][13] The spectrophotometer (UV-2450; Shimadzu Corp, Kyoto, Japan) has a ceramic emission source in which the light beams are transmitted toward the sample. In the refraction spectrometry, the monochromatic color focus on the surface of sample and part of the light beam is absorbed and the other is reflected.…”

“…The "L" value is known as whiteness or brightness of an object and ranges from 0 (black) to 100 (perfect white). 13 The "a" value represents the quantity of red (positive values) and green (negative values), while the "b" value represents the quantity of yellow (positive values) and blue (negative values). The "a" and "b" parameters coexist on the same plane within this 3-D space (Fig.…”

“…The samples were positioned in the same way using a black covered metal device that was created by the authors and adapted to the spectrophotometer (UV-2450; Shimadzu Corp, Kyoto, Japan) for use in this study; this device was designed to standardize the reading area and prevent color variation. 13 …”

“…[1][2][3][4][7][8][9][10] The ocular prosthesis is a rehabilitative option that is safe, generally aesthetically pleasing, and satisfactory from a treatment point of view. [10][11][12][13] Although it does not restore vision, it does restore the face's aesthetic appearance, beautifying the face, where the patient's appearance had been compromised. 5 The material of choice for fabrication of ocular prostheses is thermopolymerizable acrylic resin.…”

Effect of Different Chemical Disinfectants on Color Stability of Acrylic Denture Teeth

“…Besides denture base materials, studies also report color changes in relined dentures, maxillofacial elastomers, and artificial irises after immersion in chemical disinfectants . However, there are sparse data about the color stability of denture teeth.…”