Effect of Different Drying Time/Paint Protection Agent, Inclusion Substrates, and Passage of Time on Iris Color Change

Abstract

This study evaluated the effect of different drying time of iris paint/paint protection agent, iris inclusion substrates, and passage of time on iris color change. The 120 specimens were divided into six groups (n = 20) according to the drying time (24hr or 1hr)/iris protection agent (cyanoacrylate, cyanoacrylate + polymer; monopoly + polymer). After, the groups were divided into subgroups (n = 10) as a function of the inclusion substrate (wax or thermopolymerizable acrylic resin N1). Acrylic caps were painted with Black, Sepia, and Vandik brown acrylic paint. After the drying time, the irises received a layer of the protection agent and after drying, they were submitted to the first color reading (EasyShade -lighting D65). A sclera pattern was included to obtain sclera in wax and N1 acrylic resin, in which the irises were included and processed. After seven days, the color measurements were performed, the prosthesis were stored in a container with water at 37ºC for new readings after 14, 30 and 90 days. Data were analyzed by factorial ANOVA test repeated (p<0.05). The passage of the time significantly influenced the color change of the specimens (p<0.001), with the greatest color variation occurring in the first 7 days. The type of protection agent, drying time and iris inclusion substrate not influenced the color change. The greatest change in color was observed after 7 days, and remained unchanged over 90 days, although the values were considered clinically perceptible.