|Support type:||Scholarships in Brazil - Scientific Initiation|
|Effective date (Start):||June 01, 2011|
|Effective date (End):||December 31, 2011|
|Field of knowledge:||Health Sciences - Dentistry - Dental Materials|
|Principal Investigator:||Daniela Micheline dos Santos|
|Grantee:||Mariana Garib Iyda|
|Home Institution:||Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil|
The use of ocular prosthesis can provide good cosmetic and functional results. The current techniques used to fabricate ocular prosthesis should promote perfectly aesthetic and consequent dissimulation of the facial defect. Furthermore, it has been known that color instability due to polymerization procedure and clinical use compromise the longevity of ocular prosthesis. Therefore, the present study will investigate the influence of polymerization and artificial aging on the color change of artificial iris bottom (colorless cap associated with painting) among two different techniques for obtaining a button eye, using both digital photo printing for the iris. A total of 56 samples simulating ocular prosthesis will be fabricated with half of these samples for the conventional technique and the other half to the technique with prefabricated ocular caps. For each technique, samples are divided into four experimental groups (n=7) according to the use or non use of protective glaze paint and paper used (photographic or Carmine). All samples will be submitted to the accelerated aging, and color measurements will be performed by using a visible ultraviolet reflection spectrophotometer, using the CIE L*a*b system, before and after polymerization, and after 252, 504 and 1008 hours of accelerated aging. Data will be submitted to the adherence test to the normal curve, and an appropriate statistical test will be used to compare the mean values of color stability (E).