Effect of Aging of Shade Guide and Its Influence on Shade Selection-an in Vitro Study
Main Article Content
Abstract
BACKGROUND
The selection of the most appropriate colour is generally determined visually by matching commercially available shade guides to the existing dentition. However, colour determination and obtaining an appropriate match continues to be a challenge for the clinician. The colour stability of the shade guide over time is a critical factor that may influence shade selection. Evidence is lacking with respect to how the exposure of different light sources and contact of disinfectant and contact of saliva in the mouth and various other materials that come in contact in the dental clinic affects the colour stability of the shade guide.
AIM
The purpose of this study was to determine the effect of ageing of shade guide based on manufacturing date on the colour stability of Vita classical shade guide by comparing it with Spectrophotometer.
MATERIALS AND METHODS
The study was performed in a university setting where it has the advantages of a controlled environment. Approval for the study was given by the institutional scientific review board of Saveetha dental college, SIMATS, Chennai. The study was conducted over a month period and shade tabs were collected from different clinics and departments. The Vitapan Classical Shade Guide was selected for use in this study from 5 different shade guides based on the manufacturer’s date and usage in different clinics in order to include all basic hues and a wide range of saturations and values. The 5 shade guides were first evaluated visually for any perceptible or noticeable colour differences among tabs within the same shade group and each shade guide is compared to spectrophotometer based on manufacturing date and compared it to a brand new shade guide and (∆E) were calculated for each shade tab from the spectrophotometer. One Way Anova and Tukey HSD Post hoc test was performed and the p-value was determined to evaluate the significance of the variables. The activity between different groups by (∆E) was evaluated and statistics were carried using SPSS Software version 23.0 by IBM India. The results were obtained in the form of tables and graphs.