Impact of short-term dental dehydration on in-vivo dental color and whiteness Ruiz López, Javier Pulgar Encinas, Rosa María Lucena Martín, Cristina Peláez-Cruz, Priscilla Cardona Pérez, Juan De La Cruz Pérez Gómez, María Del Mar Ghinea, Razvan Ionut Dental dehydration Color difference Whiteness changes Perceptibility thresholds Acceptability thresholds The authors acknowledge funding support from research project PGC2018-101904-A-I00 from the Spanish Ministry of Science, Innovation and Universities and A.TEP.280.UGR18 grant from the University of Granada. Objective: To determine in-vivo chromatic and whiteness changes produced by short-term dental dehydration. Methods: Spectral reflectance of 452 upper incisors (226 centrals and 226 laterals) of 113 participants were measured using a spectroradiometer at baseline and after short-term dehydration (minutes 2, 4, 6, 8 and 10). CIE L*a*b* color coordinates (L*, a*, b*, C*ab and hab) and whiteness index for dentistry (WID) were calculated. Color differences (ΔE00, ΔE∗ ab) and whiteness differences (ΔWID) were computed and interpreted based on their respective 50:50% perceptibility (PT) and acceptability thresholds (AT). Statistical analysis was performed using the related samples Wilcoxon signed-rank test. Results: L* showed an increasing trend with dehydration, while a*, b*, C*ab and hab have a decreasing tendency. All chromatic coordinates showed statistically significant differences (p <0.003) at each interval of dehydration compared with baseline, except a* for all teeth. For ΔE00 and ΔE∗ ab values were higher than PT after 2 min of teeth dehydration and higher than AT after 6 and 8 min, respectively. The percentage of teeth exceeding corresponding PT was higher than 50% after 2 min. WID index increased with dehydration time, while whiteness differences were clinically perceptible after 4 min. Statistically significant differences were found for WID between all dehydration intervals (except 8− 10 min). The percentage of teeth exceeding whiteness PT was higher than 50% after 6 min of teeth dehydration. Conclusions: Short-term dental dehydration produces clinically unacceptable changes in tooth color and clinically perceptible increase in tooth whiteness level. Clinical significance: Clinical shade matching must be done within the first two minutes of any clinical procedure that requires precise chromatic determination but implies a risk of tooth dehydration. 2024-01-15T18:49:32Z 2024-01-15T18:49:32Z 2021-02 journal article J. Ruiz-López et al. Impact of short-term dental dehydration on in-vivo dental color and whiteness. Journal of Dentistry 105 (2021) 103560. [https://doi.org/10.1016/j.jdent.2020.103560] https://hdl.handle.net/10481/86803 10.1016/j.jdent.2020.103560 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier