Effects of a shade-matching light and background color on reliability in tooth shade selection

Siamak Najafi-Abrandabadi, Farhad Vahidi, Malvin N. Janal

Research output: Contribution to journalArticlepeer-review


OBJECTIVE: The purpose of this study was to evaluate the effects of a shade-matching light (Rite-Lite-2, AdDent) and different viewing backgrounds on reliability in a test of shade tab matching.

MATERIALS AND METHODS: Four members of the Prosthodontic faculty matched 10 shade tabs selected for a range of shades against the shade guide. All raters were tested for color blindness and were calibrated prior to the study. Matching took place under four combinations of conditions: with operatory light or the shade-matching light, and using either a pink or a blue background. Reliability was quantified with the kappa statistic, separately for agreement of value, hue, and chroma for each shade tab.

RESULTS: In general, raters showed fair to moderate levels of agreement when judging the value of the shade tabs, but could not agree on the hue and chroma of the stimuli. The pink background led to higher levels of agreement than the blue background, and the shade-matching light improved agreement when used in conjunction with the pink but not the blue background.

CONCLUSIONS: Moderate levels of agreement were found in matching shade tab value. Agreement was generally better when using the pink rather than the blue background, regardless of light source. The use of the shade-matching light tended to amplify the advantage of the pink background.

Original languageEnglish (US)
Pages (from-to)198-206
Number of pages9
JournalThe international journal of esthetic dentistry
Issue number2
StatePublished - Jan 1 2018

ASJC Scopus subject areas

  • General Medicine


Dive into the research topics of 'Effects of a shade-matching light and background color on reliability in tooth shade selection'. Together they form a unique fingerprint.

Cite this