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KMID : 0362420080460050443
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Journal of Korean Academy of Prosthodontics
2008 Volume.46 No. 5 p.443 ~ p.454
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Shade comparative analysis of natural tooth measured by visual and spectrophotometric methods
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Kim Bum-Suk
Lee Jong-Hyuk
Shin Soo-Yeon
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Abstract
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Statement of problem: A clinically successful color match is one of the important factor to get an esthetic dental restoration. Dental shadeguides are commonly used to evaluate tooth color in restorative procedure. But numerous reports have indicated that common shade guidesdo not provide sufficient spectral coverage of the natural tooth colors. To address issues associated with the shade guide, distinct avenueshave been pursued objective spectrophotometric / colorimetric assessment.
Purpose: This study compared the accuracy of tooth color selec-tion of spectrophotometer with that of human visual determination. Three main factors were investigated, namely, the effect of light, the in-dividual variation and the experience of the observer.
Material and methods: At the first experiment, on ten patients, one operator indepen-dently selected the best matching shade to the unrestored maxillary central incisor, using a Vita Classical Shade Guide in the morning, atnoon and in the afternoon. The same teeth were measured by means of a reflectance spectrophotometer. At the second experiment, on tenpatients, ten operators (5 experts, 5 novices) selected and measured by the same method above at noon. At the third experiment, the resultsof the second experiment were divided into two groups, expert and novice, and analyzed.
Results: 1. There was significant difference be-tween visual and spectrophotometric assessment (mean ΔE values) in experiment 1, 2, 3 (P < .05). 2. There was no significant differencebetween experts and novices group, when comparing with each visual and spectrophotometric assessment (mean ΔE values).
Conclusion:Spectrophotometer could be used to analyze the shade of natural tooth objectively. Thereby, this method offers the potential tominimizeconsiderably the need for corrections or even remakesafter intraoral try-in of restoration. Furthermore, to achieve its advantage, both theshade-matching environment and communication between dentist and technician should be optimized with use of visual and instrumentalshade-matching systems.
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KEYWORD
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Visual shade selection, Instrumental shade selection, Spectrophotometer, Shade guide, ShadepilotTM
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