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KMID : 1023820180100030218
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The Journal of Advanced Prosthodontics
2018 Volume.10 No. 3 p.218 ~ p.226
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Color comparison between non-vital and vital teeth
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Greta Delia Cristina
Colosi Horatiu Alexandru
Gasparik Cristina
Dudea Diana
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Abstract
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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.
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KEYWORD
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Dental color, Non-vital tooth, Instrumental measurement, Color parameter, Dyschromia
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