Objective To investigate the influence of different intensity and directions of ambient light and adjacent tooth in anterior tooth color measurement by using colorimeter. Methods Fiber lite MI- 150 was used as ambient illuminant and it irradiated from three or twelve o′clock direction through 45°angle above. The light magnitude 0, 50, 75, 100, 125, 150 W were applied in this experiment. The values of CIE L﹡ a ﹡ b﹡were measured by Minolta Chroma meter CR- 321 colorimeter on the center labial surface of ten extracted human maxillary central incisors with or without adjacent teeth, then those data were analyzed statistically by using SPSS 11.5. Results Neither different intensities nor different directions of ambient light could influence the results of color measurement by using Minolta Chroma meter CR- 321 colorimeter, so did the adjacent teeth whether those were exist or not. Conclusion There is no influence of ambient light and adjacent teeth in the color measurement of anterior teeth under this experiment condition, and Minolta Chroma meter CR- 321 colorimeter can be used to measure the color directly aside the chair with light.
