The influence of some different factors on the accuracy of shade selection

Abstract

The purpose of this study was to elucidate some of the factors on which accurate shade taking depends. Custom shade tabs (0.5, 1.0 and 1.5 mm porcelain thickness) were fabricated from selected Vita and Shofu porcelains. Four main factors were investigated, namely, the difference between the two types of porcelain used, the effect of light quality, the effect of porcelain thickness and the experience of the observer. The chi-square test for independence at a probability level of P <0.05 was used to analyse the results. The results indicated that in ideal light there was no difference between the two porcelains (P=0.58). The experienced observers proved better than the novice observers in ideal light conditions (P=0.003). Thickness was also significant in the overall results (P=0.0001), in that thicker samples gave more accurate results. The results indicate that in adverse light, there was an overall difference between the two porcelains (P=0.046), but no difference between the experienced and novice observers. The thickness made no difference to the experienced or the novice observer in adverse light. These results indicate that the most influential factor on shade taking was the light quality (P <0.0001); better results were obtained overall for the ideal light situation. In ideal light thicker samples gave better results (P=0.0001).

Visual Assessment of Dental Filling Shades as Performed by Students of Dentistry and Dental Technology

“…The test participants with extensive experience in shade assessment were far more accurate when selecting shades than general dental practitioners. Other authors found no relationship between experience and accuracy of shade matching [2,3]. Although the difference in clinical experience among our students was not extensive, a detailed analysis of the obtained data showed that the students of dental technology would more often assess filling shades in the correct way, thereby producing fewer incorrect answers.…”

“…In some studies, no statistically significant differences in distinguishing shades were demonstrated between subjects representing various ages, sexes, and occupations [2,3,14].…”

“…The studies published have been unable to conclusively determine whether the examiner's experience is important for the efficacy of shade assessment. Given the conflicting reports in this respect, this topic requires further research [2][3][4]. Independent work and the patient's aesthetic requirements are therefore a great challenge for students and, then, doctors.…”

Effect of Gender, Experience, and Value on Color Perception

“…In addition, the study evaluated the extent to which the observer's clinical experience, [15][16][17][18][19] the ceramic shade, 20,21 and the value 5,21 had an influence on the choice of shade.…”

A clinical evaluation of the individual repeatability of three commercially available colour measuring devices

“…11,[13][14][15][16][17][18][19][20][21] The purpose of this study was to measure the repeatability of three commercially available CMDs under clinical conditions using one trained operator.…”