Abstract: Objective: To study the color distribution of natural anterior teeth crowns of the young and middle-aged in Liaoyang and to provide the information for color-matching in prosthetic dentistry. Methods: The study consisted of 142 people aged from 28 to 45 years and born in Liaoyang. A total of 852 healthy anterior teeth were measured with a fiber-optical spectrophotometery system. Results: The L values of cervical, middle and incisal parts of upper center incisors were （72.57±6.34）, （74.52±5.60） and （67.29±6.08）, respectively. Those of the upper lateral incisors were （66.86±6.50）, （69.44±8.62） and （63.12±7.01）, respectively. Those of the upper canines were （60.52±11.70）, （61.42±9.20） and （54.12±8.37）, respectively. Conclusion: Among upper anterior teeth of young and middle-aged people in Liaoyang，the L values decreased from upper central incisor to cuspid teeth, but the a and b values increased. The colors in different areas of teeth were variable. In middle 1/3, the L values were the highest, but the a and b values were lower; the L, a and b values in cervical 1/3 were higher than those in incisal 1/3.

Key words: Color matching , Tooth color , Measurement