Abstract
A method of applying the CCM system to reproduce natural tooth color in metal ceramic restorations was successfully undertaken by a newly modified spectrophotometer and measuring system.The spectrophotometer utilizes bidirectional (45/0) geometry and a telephoto camera lens capable of measuring small areas (1×2mm) of the tooth and gingiva by the “noncontact” method. Furthermore, color measurements were automatically done by means of a scanning program.The standard deviation (S. D.) of the reflectance factors, measured 10 consecutive times, was under 0.16, and the color difference dE was around 0.21. Both the measuring data of the Munsell color chips by this spectrophotometer and integrating sphere spectrophotometer Macbeth CE 3000 were nearly identical.It was concluded that this newly modified spectrophotometer could measure small areas of the tooth efficiently, and also be beneficial for use in dental clinics and research.
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