New insights in the reproducibility of visual and electronic tooth color assessment for dental practice
- PDF / 1,389,622 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 42 Downloads / 161 Views
RESEARCH
Open Access
New insights in the reproducibility of visual and electronic tooth color assessment for dental practice Anja Ratzmann1*, Alexander Welk2, Stephanie Hoppe3, Jochen Fanghaenel4 and Christian Schwahn5
Abstract Background: The aim of the study was to compare a 2D and 3D color system concerning a variety of statistical and graphical methods to assess validity and reliability of color measurements, and provide guidance on when to use which system and how to interpret color distance measures, including ΔE and d(0M1). Methods: The color of teeth 14 to 24 of 35 patients undergoing regular bleaching treatment was visually assessed and electronically measured with the spectrophotometer Shade Inspector™. Tooth color was recorded before bleaching treatment, after 14 days, and again after 6 months. VITAPAN® Classical (2D) and VITA-3D-Master® (3D) served as reference systems. Results: Concerning repeated measurements, the 2D system was superior to the 3D system, both visually and electronically in terms of ΔE and d(OM1), for statistics of agreement and reliability. All four methods showed strong patterns in Bland-Altman plots. In the 3D system, hue was less reliable than lightness and chroma, which was more pronounced visually than electronically. The smallest detectable color difference varied among the four methods used, and was most favorable in the electronic 2D system. Comparing the methods, the agreement between the 2D and 3D system in terms of ΔE was not good. The reliability of the visual and electronic method was essentially the same in the 2D and 3D systems; this comparability is fair to good. Clinical relevance: The 3D system may confuse human raters and even electronic devices. The 2D system is the simple and best choice.
Background Valid and reliable measurements of tooth color are of major importance in esthetic and restorative dentistry as well as in dental technical practice. Tooth color is usually described based on the Munsell color space in terms of hue, value, and chroma [1, 2]. Hue measures the basic color, value indicates the lightness of a color, and chroma measures the saturation or intensity of a color. Value is determined first, followed by chroma, yielding * Correspondence: [email protected] 1 Department of Orthodontics and Department of Dental Propaedeutics/ Community Dentistry, Dental School, University Medicine, Walther-Rathenau-Strasse 42, 17475 Greifswald, Germany Full list of author information is available at the end of the article
hue as the third dimension. One of the most important prerequisites is the assessment of tooth color either via visual comparison with prefabricated color scales or using measuring devices such as a colorimeter, spectrophotometer or digital imaging systems with corresponding software [3]. The most common method in clinical practice is still the visual method using VITAPAN® Classical shade guide, which is a 2D system. In 1998, the VITA 3D-Master® shade guide was launched on the dental market. It was developed to systematize color
Data Loading...
