2008, Number 2
Evaluation of visual alterations and their relations with the power of discrimination in dental color registration between dental students with natural and artificial light source
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ABSTRACTObjective: Determine the relationship that exists between visual impairments and the perception of color for dental restorations under natural and artificial light conditions. Material and methods: A total of 38 third and fourth year students of the Universidad Tecnológica de Mexico participated in this research. They all signed informed consent as to the release of the data concerning their visual conditions. A certified ophthalmologist examined them for visual acuity, retinal disease, refraction and color test using Ishihara test strips. Each participant was given a shade guide with Vita classic shades A1-A4, B1-B4, C1-C4, and D2-D4. The assessment was made under natural and artificial light sources. This is a transversal, observational, analytical, and prospective research made through a non probabilistic consecutive sampling. The statistical analysis used were χ2 with a level of significance of p ‹ 0.05. Results: A total of 9 (0.23%) individuals had no visual impairment, 16 (0.42%) were diagnosed as having hypermetropic astigmatism and hypermetropia, 2 (0.23%) had color perception problems. The discriminative ability was better using natural rather than artificial lighting (χ2 23.35 p ‹ 0.001). Using natural light color recognition was adequate on 18 (0.47%) students of whom their ophthalmologic diagnosis was no visual impairment, 10 had visual defects with a small amount of dioptries. No relation was found regarding sex, age, visual defect and/or the year the students were in dental school p ›0.05. Conclusion: The discriminative ability in a natural light environment is the most favorable for assessment of color perception in dental restorations.
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