Authors : Fariborz Vafaii, Fereidoon Soltani, Mahdi Kadkhodazadeh, Zahra Moshiri and Masoomeh Khoshhal
Abstract: The purpose of this study was to compare accuracy of clinical observation and evaluation of digital photographs for shade matching and detection of contour defects. Ten PFM crowns were fabricated using natural teeth. In each crown, a few contour defects were produced. Twenty subjects (7 prothodontists, 7 technician, 6 dental students) with safe color vision make matching color using 3D Master shade guide and detect contour defects and stain requirement. The evaluations were accomplished under standard illumination (illumination of daylight at 11-12 am, No. 6 dental unit, Prosthodotics Department). A photograph of each crown was made with digital camera. After 2-3 weeks the shade selection and detection of contour defects and stain requirement was done but based on digital images. Data were statistically analyzed by SPSS software using paired t-test and Wilcoxon test. Difference of color scores between clinical observation and standard was ΔE = 7.41±13.37 significantly lower than that between digital image and standard (ΔE = 11.14±13.03). By clinical observation, there was complete adjustment in incisal/occlusal edge 43.1%, incisogingival height 17.7%, bucolingual contour 16.7% and incorrect line angle 7.7% and by digital evaluation, incisal/occlusal edge 45%, incisogingival height 13.4%, bucolingual contour 6.7% and incorrect line angle 2.4%. Detection of stain requirement completely adjusted in 37.3% by two methods. According to this study, it was concluded that shade selection of PFM crowns and detection of contour defects by clinical observation would have higher accuracy rather than digital image evaluation.
Fariborz Vafaii, Fereidoon Soltani, Mahdi Kadkhodazadeh, Zahra Moshiri and Masoomeh Khoshhal, 2012. Evaluation of Color and Contour Matching Accuracy with Digital Photography and Direct Vision. Research Journal of Medical Sciences, 6: 46-50.