Abstract: Objective: To investigate the clinical effect of individual teeth tray in clinical treat. Methods: 120 patients treated by crown restoration in premaxillary teeth region were randomly divided into 3 groups, and the impressions were prepared by one-step(group A), two-step(group B) technique of silicon rubber, and individual teeth tray impression technique(group C). Finally, we graded all data according to the criterion of the cervical accuracy, and Kruskal-Wallis test was used to compare the cervical accuracy among three test groups. Results: Among three groups there had significant difference (P<0.05). The outstanding rate of C group was significant higher than that of other 2 groups(P<0.05). Conclusion: The impression technique with individual teeth tray is better than conventional technique. The individual teeth tray can copy the shoulder and the tissue under the shoulder accurately, and can improve the marginal fit of the prosthesis.

Key words: Impression , Anatomical shape , The cervical margin precision, Individual teeth tray