J Adv Prosthodont.  2018 Jun;10(3):218-226. 10.4047/jap.2018.10.3.218.

Color comparison between non-vital and vital teeth

• Greta DC
• Colosi HA
• Gasparik C
• Dudea D

• KMID: 2413491
• DOI: http://doi.org/10.4047/jap.2018.10.3.218

Abstract

PURPOSE
The aim of this study was to define a color space of non-vital teeth and to compare it with the color space of matched vital teeth, recorded in the same patients.
MATERIALS AND METHODS
In a group of 218 patients, with the age range from 17 to 70, the middle third of the buccal surface of 359 devitalized teeth was measured using a clinical spectrophotometer (Vita Easyshade Advance). Lightness (L*), chromatic parameters (a*, b*), chroma (C*), hue angle (h) and the closest Vita shade in Classical and 3D Master codifications were recorded. For each patient, the same data were recorded in a vital reference tooth. The measurements were performed by the same operator with the same spectrophotometer, using a standardized protocol for color evaluation.
RESULTS
The color coordinates of non-vital teeth varied as follows: lightness L*: 52.83-92.93, C*: 8.23-58.90, h: 51.20-101.53, a*: −2.53-24.80, b*: 8.10-53.43. For the reference vital teeth, the ranges of color parameters were: L*: 60.90-97.16, C*: 8.43-39.23, h: 75.30-101.13, a*: −2.36-9.60, b*: 8.36-39.23. The color differences between vital and non-vital teeth depended on tooth group, but not on patient age.
CONCLUSION
Non-vital teeth had a wider color space than vital ones. Non-vital teeth were darker (decreased lightness), more saturated (increased chroma), and with an increased range of the hue interval. An increased tendency towards positive values on the a* and b* axes suggested redder and yellower non-vital teeth compared to vital ones.

Keyword

Dental color; Non-vital tooth; Instrumental measurement; Color parameter; Dyschromia

MeSH Terms

Humans
Tooth*
Tooth, Nonvital

Figure

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  Fig. 1 The CIE L*, a*, b* color space of vital versus non-vital teeth.

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  Fig. 2 Distribution of chromatic parameters (a* and b*) in non-vital and vital teeth.

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  Fig. 3 Frequency distribution of ΔE00 for the 332 matching pairs of vital and non-vital teeth.

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