Related Experiment Video
Updated: Apr 21, 2026
A Standardized Approach to Extra-Oral and Intra-Oral Digital Photography
Published on: July 22, 2022
Comparative Evaluation of Visual Observation, Digital Camera, and Smartphone Photography for Tooth Shade Selection:
Krithika Jothisankar1, Reena Mittal1, Ravi Madan1
1Department of Prosthodontics, Kothiwal Dental College and Research Centre, Moradabad, IND.
Background:
Accurate shade selection is critical for achieving esthetic success in fixed prosthodontics. This in vitro study aimed to compare the accuracy and reliability of shade selection using conventional visual assessments, digital camera photography, and smartphone photography.
Materials And Methods:
Ten shade tabs were evaluated by 10 observers (three professors, four postgraduate students, and three laboratory technicians), resulting in 100 observations per method. Shade matching was performed using the VITAPAN Classical shade guide (VITA Zahnfabrik H. Rauter GmbH and Co. KG, Bad Säckingen, Germany) under standardized daylight conditions (5000-6500 K). Visual selection relied on direct comparison, while digital camera and smartphone images were captured with consistent settings. Accuracy was determined based on agreement with a predetermined reference shade. Statistical analyses included Cochran's Q test for overall differences, pairwise McNemar tests with Bonferroni adjustment, Fleiss' kappa for inter-observer agreement, and Cohen's kappa for intra-observer agreement between methods.
Results:
Both digital camera and smartphone methods demonstrated significantly higher accuracy and consistency than the visual approach. Digital camera and smartphone photography showed substantial inter-observer reliability and strong agreement between the two digital techniques, effectively reducing the variability associated with observer experience. No meaningful differences were observed between the digital camera and smartphone methods.
Conclusion:
Digital cameras and smartphone photography provided reliable, objective alternatives to conventional visual shade selection, offering improved accuracy and reproducibility. These techniques hold promise for enhancing shade communication in clinical prosthodontics, particularly in settings where accessibility and standardization are priorities. Further in vivo investigations are warranted to confirm its applicability in clinical conditions.
