Abstract: Objective To measure the length of maxillary central incisors by panoramic radiographs among individuals in Jiangsu Province, providing statistical basis for post crown restoration. Methods Maxillary central incisor data of 114 people from Jiangsu province obtained by panoramic radiographs were measured. The length was divided into crown part and root part by the line of mesio-distal alveolar crest. The effects of gender, sides and age were analyzed. Results The average length was (9.20±0.27) mm and (12.28±0.31) mm for crown part and root part, separately. Significant differences were detected in gender (P＜0.05). The difference was mainly manifested between middle age group and old age group (P＜0.05). But no significant differences were detected in sides and age (P＞0.05). The length of the post in the bone should reach 6-8mm to realize effective retention. Conclusion The length of maxillary central incisors is symmetrical between two sides and similar among all age groups in Jiangsu, but the crowns and roots in male are longer than those in female.

Key words: maxillary central incisors, digital- panoramic radiograph, post crown, post length