Evaluation in vitro of the physical and mechanical properties of two ocular prosthesis acrylic resins after immersion in different disinfectant solutions

Abstract

The ocular prosthesis biologically adapted and suitable disinfected due mainly to bring comfort to the patient, through the preservation of the material properties and reduction of ocular microbiota biofilm over time of use by the patient. For this reason, the present study will investigate the microhardness, roughness and surface energy of two ocular prosthesis acrylic resins: colorless and N1, on the influence of different disinfectant solutions and period of disinfection and storage. A total of 308 samples (1.0 cm in diameter and 0.3 cm in thickness ) being 154 acrylic resin for the colorless and 154 acrylic resin for the N1 will be made. The samples will be disinfected daily during 180 days according to the disinfectant solution used and immersion periods on the disinfectant solutions: immersion in distilled water for 10, 15, 30 min and 6 h (control); immersion in neutral soap for 30 minutes; immersion in Opti -Free Express for 30 min and 6 h; immersion in Efferdent tables for 15 min; immersion in chlorhexidine gluconate 0.5, 2 and 4% for 10 min (each concentration). The experimental trial will be conducted by random allocation of treatment (disinfection) to experimental units (samples). Readings microhardness, roughness and surface energy (n = 10), and AFM imaging (n = 1) and SEM/EDS (n = 1) will be performed in the baseline period and periods after disinfection and storage of 2 weeks, 60 days and 180 days. Data will be submitted to the test of adherence to the normal curve, and applied appropriate statistical test for comparing the average values of tests.