Validation and Reliability of Visual Assessment with a Shade Guide for Tooth-Color Classification

Abstract

Operative Dentistry, 2008, 33-2, 121-126 SS Meireles • FF Demarco • IS Santos SC Dumith • A Della Bona Clinical RelevanceThe results of this study showed that the visual assessment of tooth color using the Vitapan Classical shade guide is a valid method for distinguishing between light and dark tooth colors. SUMMARYThis study evaluated the validity and reliability of the visual assessment of tooth color using a commercial shade guide. Ninety-two individuals were randomly selected from subjects enrolled in a randomized controlled trial comparing two formulations of carbamide peroxide. Initially, each individual had the color of his or her six maxillary anterior teeth (n=552) determined by one examiner using a digital spectrophotometer (Vita Easyshade). Then, a visual assessment was made by two calibrated examiners using a shade guide (Vitapan Classical). Reliability was evaluated either by kappa coefficient when all the colors were grouped into two categories (dark and light) or by weighted kappa when all 16 colors of the shade guide were considered. The digital spectrophotometer (Vita Easyshade) was used as the gold standard to calculate sensitivity and specificity of the visual assessment. The reliability of the visual assessment using two color categories was "substantial" (k=0.69). When all colors of the shade guide were considered, the reliability was "mild" (kw=0.33). Sensitivity and specifici-

In Vivo and in Vitro Evaluations of Repeatability and Accuracy of VITA Easyshade® Advance 4.0 Dental Shade-Matching Device

“…Since the examiner in this study was trained and well experienced in the color measurements with the tested device and we achived the standardized conditions and illumination, this finding for the in vivo model may be attributed to the tooth variance in surface morphology and the different tooth layers' thickness and transparency. Although ICCs for the in vivo model in this study coincided in all CIE L*a*b* compontents with those of Lehman, our dE was slightly higher and therefore got on the upper level of clinically visible difference obvious only to a trained eye (23)(24)(25)(26)(27).…”

“…These values remain below the 50% acceptability level of 5.5 dE units, but exceed the 50% of perceptibility threshold for a clinical mismatch in the in vivo model (varies from 2.6 to 3.3 dE units) (5,(23)(24)(25)(26)(27). Since the examiner in this study was trained and well experienced in the color measurements with the tested device and we achived the standardized conditions and illumination, this finding for the in vivo model may be attributed to the tooth variance in surface morphology and the different tooth layers' thickness and transparency.…”

Tooth color assessment

“…Kada se vrijednosti a* i b* kreću od ishodišta prema rubu sustava dolazi do pomicanja boja te kromatičnost raste. Upravo ta udaljenost između ishodišta i položaja boje označava kromatičnost boje, C* i računa se kao: C* ab = (a* 2 + b* 2 ) 1/2 (23,24). Kolorimetrijska razlika, odnosno ukupna razlika boja označava se s Delta E, a izračunava se pomoću formule: ΔEab = [(ΔL*) 2 + (Δa*) 2 + (Δb*)] 1/2 (28,28).…”

“…Danas postoje mnogi sustavi za odabir boje, a možemo ih podijeliti na konvencionalne (vizualne) i kompjutorske ili digitalne sustave 9,13,[22][23][24][25][26] .…”

Actual Methods of Color Measurement: A Systematic Review

“…ise Vita Classic skalasının kullanımının yapılan renk seçiminde özellikle koyu ve açık diş renklerini ayırt edebilmede geçerli ve güvenilir bir yöntem olduğunu belirtmişlerdir. 13,14 Ishikawa-Nagai ve ark., 176 üst keser diş, iki skala (Vitapan Classic ve 3D-Master) ve 15 veneerlenmiş zirkon diskin renk haritasını çıkarmış, 21 renkten oluşan yeni bir skala geliştirmişlerdir. 23 Bu 21 rengi Cerabian ZR porselen tozlarından elde etmişlerdir.…”