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Evaluation of Different Academic Groups’ Success in Shade Matching with Digital Photographs

Purpose: It’s aimed to investigate the effectiveness of using intraoral scanners and cross-polarization technique in digital photographs for shade matching applied in clinical practice and also to evaluate the effect of clinical experience level on shade matching success.

Materials & Methods: Color analysis was performed on the maxillary right central teeth of 10 subject models with a spectrophotometer, which is accepted as the gold standard. Digital impressions of these subjects were made with an intraoral scanner and the colors of the same teeth were determined by using the software. Finally, cross-polarized and non-polarized photographs were taken with standard settings. Each shade of Vita Toothguide 3D-MASTER scale was also photographed. 4 different groups, including prosthodontics faculty members, PhD students, dentistry students who completed their internship and dental technicians matched the shades and the photographs obtained with both techniques on a computer screen. Data were analyzed with IBM SPSS V23. Distribution conformity was examined with Shapiro Wilk test and Kruskal Wallis test was used to compare data that were not normally distributed. The compatibility of the intraoral scanner and the spectrophotometer was examined with Kappa. Significance level was accepted as p<0.05.

Results: There was no significant statistical difference between the groups based on clinical experience in the shade matching performed on both cross-polarized and non-polarized photographs (p >0.05). Shade matching performed with cross-polarized photographs was found to be significantly more successful than non-polarized photographs (p<0.05). Intraoral scanner and spectrophotometer data were found to be poor in terms of strength of agreement (κ=0,101).

Conclusion: While clinical experience does not influence the success rate of shade matching, cross-polarized photography technique is found as a more reliable method. Shade matching performed with an intraoral scanner has not been found appropriate in clinical practice.

Sina Saygılı
Istanbul University Faculty of Dentistry

Berkman Albayrak
Bahçeşehir University School of Dental Medicine

Tonguç Sülün
Istanbul University Faculty of Dentistry


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