alexa Intraoral determination of the tolerance of dentists for perceptibility and acceptability of shade mismatch.


Oral Health Case Reports

Author(s): Douglas RD, Steinhauer TJ, Wee AG

Abstract Share this page

Abstract STATEMENT OF PROBLEM: There is little agreement in the dental literature as to how much color difference constitutes an acceptable shade mismatch or how much color difference is considered perceivable to observers. Most studies attempting to determine perceptibility and acceptability of tolerances for shade mismatches have been conducted under in vitro conditions that are not applicable to clinical scenarios. PURPOSE: The goal of this study was to determine valid acceptability and perceptibility tolerances for shade mismatch in an actual clinical scenario using spectroradiometric instrumentation. MATERIAL AND METHODS: A test denture was fabricated that allowed 10 maxillary left central incisors of varying shade mismatch with the right central incisor to be interchanged within the denture base. A spectroradiometer was used to determine the CIELAB coordinates and color differences (DeltaE) between the right central incisor and the interchangeable left central incisor denture teeth. The interchangeable denture teeth ranged uniformly from 1 DeltaE unit (visually undetectable) to greater than 10 DeltaE units (an obvious shade mismatch). The test denture with each of the interchangeable teeth was modeled by a subject to 28 dentists in a clinical setting. For each of the interchangeable teeth, dentist observers were asked if they could see a difference between the central incisors and, if so, whether the difference was acceptable. A Probit regression analysis was used to predict acceptability and perceptibility tolerances with 95\% confidence limits. RESULTS: The predicted color difference at which 50\% of the dentist observers could perceive a color difference (50/50 perceptibility) was 2.6 DeltaE units. The predicted color difference at which 50\% of the subjects would remake the restoration due to color mismatch (clinically unacceptable color match) was 5.5 DeltaE. Acceptability and perceptibility color tolerances at the 50/50 level were significantly different (P<.05), as their 95\% confidence limits did not overlap. CONCLUSIONS: Tolerances for perceptibility were significantly lower than tolerances for acceptability for shade mismatch between 2 denture teeth. This article was published in J Prosthet Dent and referenced in Oral Health Case Reports

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

  • Asia-Pacific Dental and Oral Care Congress
    October 26-28, 2017 Osaka, Japan
  • American World Dentistry
    November 13-14, 2017 San Antonio, USA
  • 39th World Dental Congress Summit
    Dec 4-6,2017 Sao Paulo,Brazil

Relevant Topics

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version