Javier Ruiz-López1, Rosa Pulgar2, Cristina Lucena3, Priscilla Pelaez-Cruz4, Juan C Cardona5, Maria M Perez6, Razvan Ghinea7. 1. Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, S/N 18071, Granada, Spain. Electronic address: jruizlo@ugr.es. 2. Department of Stomatology, Faculty of Dentistry, University of Granada, Campus de Cartuja S/N, Granada, 18071, Spain. Electronic address: rpulgar@ugr.es. 3. Department of Stomatology, Faculty of Dentistry, University of Granada, Campus de Cartuja S/N, Granada, 18071, Spain. Electronic address: clucena@ugr.es. 4. Department of Stomatology, Faculty of Dentistry, University of Granada, Campus de Cartuja S/N, Granada, 18071, Spain. Electronic address: pvpc404@hotmail.es. 5. Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, S/N 18071, Granada, Spain. Electronic address: cardona@ugr.es. 6. Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, S/N 18071, Granada, Spain. Electronic address: mmperez@ugr.es. 7. Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, S/N 18071, Granada, Spain; Department of Physics, Faculty of Sciences, University of Craiova, 13 AI Cuza Street, Craiova, 200585, Romania. Electronic address: rghinea@ugr.es.
Abstract
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, ΔEab*) 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 ΔEab* 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.
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, ΔEab*) 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 ΔEab* 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.
Authors: Javier Ruiz-López; Maria M Perez; Cristina Lucena; Rosa Pulgar; Ana López-Toruño; Maria Tejada-Casado; Razvan Ghinea Journal: Clin Oral Investig Date: 2022-05-31 Impact factor: 3.606