Chromatic changes to artificial irises produced using different techniques

Abstract

Abstract. Ocular prostheses are important determinants of their users' aesthetic recovery and self-esteem. Because of use, ocular prostheses longevity is strongly affected by instability of the iris color due to polymerization. The goal of this study is to examine how the color of the artificial iris button is affected by different techniques of artificial wear and by the application of varnish following polymerization of the colorless acrylic resin that covers the colored paint. We produce 60 samples (n ¼ 10) according to the wear technique applied: conventional technique without varnish (PE); conventional technique with varnish (PEV); technique involving a prefabricated cap without varnish (CA); technique involving a prefabricated cap with varnish (CAV); technique involving inverted painting without varnish (PI); and technique involving inverted painting with varnish (PIV). Color readings using a spectrophotometer are taken before and after polymerization. We submitted the data obtained to analyses of variance and Tukey's test (P < 0.05). The color test shows significant changes after polymerization in all groups. The PE and PI techniques have clinically acceptable values of ΔE, independent of whether we apply varnish to protect the paint. The PI technique produces the least color change, whereas the PE and CA techniques significantly improve color stability.

In vitro analysis of different properties of acrylic resins for ocular prosthesis submitted to accelerated aging with or without photopolymerized glaze

“…There is still controversy regarding the establishment of a satisfactory clinical value for color change. Canadas et al (2010) [15], [31] and, Mundim et al (2012) [41] affirm that ΔE values N3.3 are clinically unacceptable, while other authors state that this value must be N3.7 [5]. In this study, all groups had visually perceptible color change, and groups with photopolymerized glaze were the most clinically unacceptable (Tables 2 and 3).…”

“…Color changes (ΔE) were analyzed by refraction spectrophotometry (UV-2450, Shimadzu Corp., Kyoto, Japan) and calculated using the CIE L * a * b system, as established by the International Commission on Illumination (CIE) [32], considering the color perception between two points in a three-dimensional color space [5,25,31,33].…”

“…Colorless and N1 acrylic resins are the materials of choice for the fabrication of ocular prostheses since they exhibit easy handling, good adaptation, satisfactory esthetics, and low cost [1][2][3]. N1 acrylic resin simulates the natural color of the sclera, while colorless resin is used to cover the characterization of blood vessels and artificial iris [2][3][4][5]. To ensure longevity of an ocular prosthesis, it is essential to ensure its esthetic, chemical, physical, and mechanical properties [1,6,7].…”

Can Nonthermal Plasma Improve the Adhesion between Acrylic Resin for Ocular Prostheses and Silicone‐Based Relining Material?

“…White‐color heat‐polymerized acrylic resin is the material of choice for prosthesis fabrication, since it is low cost, biocompatible, esthetic, and easy to manipulate . Resilient relining materials are associated with resin and act to absorb and redistribute forces on the prosthesis .…”

“…White-color heat-polymerized acrylic resin is the material of choice for prosthesis fabrication, since it is low cost, biocom-patible, esthetic, and easy to manipulate. [4][5][6][7][8] Resilient relining materials are associated with resin and act to absorb and redistribute forces on the prosthesis. 9 In addition, they are used to improve the adaptation of the prosthesis with the objectives of preserving support structures, giving comfort to the patient, and alleviating conditions of local chronic pain.…”