To chart the color accuracy of DSLR camera in conjunction with the imaging software for excellence in fixed prosthodontics
BACKGROUND: The instrumental methods for analysing dental color have been introduced to practice in order to transform subjective analysis into an objective method that to in a cheaper way, which al lows the numerical expression through different systems, of dental color parameters. As a result, variations induced by particularities of individual percept ion are avoided, as well as the errors generated by the phenomenon of metamerism. The recent technological improvements in computers, communication networks and the internet have greatly affected contemporary society. These improvements have translated also in the domain of dental medicine; a new generation of technologies focused on analysis, communication and color checking was developed in recent years. In this study the method used by DSLR is emphasized importantly as this the best localized method. The images produced via a DSLR are analysed using appropriate imaging software like Adobe photoshop and etc. This should be a much cheaper and easier process than the use of spectrophotometers or colorimeters. The objective of this study was to compare the digital imaging in guidance of appropriate imaging software with other instrumental methods. AIM OF THE STUDY: To Purpose of the study evaluate on color accuracy of DSLR camera in conjunction with the imaging software for excellence in fixed prosthodontics. MATERIALS AND METHODS: The digital camera used for the study was a Nikon D1500 series, single lensrefle (DSLR) camera. The camera settings was ISO 200, white balance AUTO, automatic flash mode off, expose of the camera AUTO, Resolution of the camera picture is RAW FINE aperture of the camera is AUTO, image size LARGE, camera should be on auto focus, temperature should be 4500 to 5000 kelvin, natural day light will be used .The object is placed 70 cm from the camera. The digital camera was connected with class 10 memory card and the image should copy analysing software (Adobe Photoshop CS software[Middle Eastern Version by Adobe(r) Version: 7.0] standard shade guide will be used for this study they are vi ta pan classic A1 to D4, and vi ta 3d master. They record a dimensionally accurate image. Vita pan and vi ta 3d master shade guide tabs should be captured by DSLR camera in daylight, 25 pictures will be taken of each tabs approximately 70 cm distance under the 16% grey card .Photos will separate three quadrants they are cervical third, middle third, Incisial third. The photos are under RAW FINE file and the photos are opened up with our Photoshop. Click the window tab of Photoshop menu and click color and then select the lab slider tab under the color and navigate to image, adjustment to color balance curves. Select the grey eyedropper and then pick a point in the grey card part of the image to serve as the grey anchor point and this will correct the white balance of the image. By using the eyedropper tool from the Photoshop menu we get the LAB values and it will be calculated with shade guide recommended LAB values. The L* a* b* values obtained using Adobe Photoshop software as from the above CIEL* a* b* derived a* and b* values, L a* b* values were thus recorded for each subject. T h e D E (difference in the shade) between the spectrophotometer derived L*b* values obtained by the digital photography technique which was calculated using the following formula DE (L1 L2)2 a1 a 2)2 (b 1 b 2)2 1 2. Therefore, for each subject, the delta E was determined with respect to the shade guide value and DSLR camera variation. RESULTS: A s co r e o f "agreement" or "not in agreement" was given for delta E <2 and more than 2, respectively (Table 47) This was done because the color difference between two objects (delta E) of 2 is not discernible to the human eye as suggested by Della Bona et al. Data were subjected to statistical analysis using Statistical Package for the Social Sciences (SPSS version 21.0, IBM Corporation, New York, USA) Coefficient of agreement was checked between reference values and values obtained from digital images of shade tabs. Percentage of samples with similar scores (accuracy) between reference values of shade tabs and values obtained from digital images was also checked. CONCLUSION: Wi thin the limitation of the study, the digital photography method showed a high (statistically significant) percentage of agreement with the reference values for the shade tabs selected. So Digital photography can emerge as a viable alternative to the use of spectrophotometers for shade select ion in a clinical setup. Further studies are needed to assess the various factors which can cause the variation in results such as the different set of digital camera or different lenses used or different types of sensors used in camera, which has to be further investigated.