Impact of short-term dental dehydration on in-vivo dental color and whiteness

Javier Ruiz-López; Rosa Pulgar; Cristina Lucena; Priscilla Pelaez-Cruz; Juan C Cardona; Maria M Perez; Razvan Ghinea

doi:10.1016/j.jdent.2020.103560

Impact of short-term dental dehydration on in-vivo dental color and whiteness

J Dent. 2021 Feb:105:103560. doi: 10.1016/j.jdent.2020.103560. Epub 2021 Jan 6.

Authors

Javier Ruiz-López¹, Rosa Pulgar², Cristina Lucena³, Priscilla Pelaez-Cruz⁴, Juan C Cardona⁵, Maria M Perez⁶, Razvan Ghinea⁷

Affiliations

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.

PMID: 33352224
DOI: 10.1016/j.jdent.2020.103560

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 h_ab) and whiteness index for dentistry (WI_D) were calculated. Color differences (ΔE₀₀, ΔE_ab^*) and whiteness differences (ΔWI_D) 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 h_ab 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. WI_D index increased with dehydration time, while whiteness differences were clinically perceptible after 4 min. Statistically significant differences were found for WI_D 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.

Keywords: Acceptability thresholds; Color differences; Dental dehydration; Perceptibility thresholds; Whiteness changes.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Color
Color Perception
Dehydration*
Humans
Incisor* / diagnostic imaging