Liao Wen, Li Jian-Hua, Yao Yang, Zhang Ru, Zheng Li-Wei, Tang Xiao-Hua, Yu Hai-Yang
State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2009 Jun;27(3):272-5.
To investigate the morphology of maxillary permanent central incisors of people in Sichuan so as to provide some guidance for emulational restoration of fixed prosthesis.
Fifty-eight extracted maxillary permanent central incisors were selected from people in Sichuan. All of the teeth involved in this study were selected according to certain criterions. The length and width of the anatomical crowns, the length and the width of the developmental grooves and the angles formed by the two sides of the developmental grooves were measured.
The average length and width of anatomical crowns in Sichuan people were (11.9 +/- 1.3) mm and (8.7 +/- 0.8) mm respectively. And the average length and width of the developmental grooves were (5.7 +/- 0.9) mm and (2.1 +/- 0.5) mm respectively. There were no statistical differences between the length of the mesial and distal developmental grooves and so were the width. The ratio of the length of crowns to that of the developmental grooves was 2.1, while for the width, it was 4.2. The angles of the mesial and distal developmental grooves formed by its two sides were 23 degrees +/- 4.7 degrees and 23 degrees +/- 5.7 degrees respectively.
The average length and width of maxillary permanent incisors were close to Wang's report, which means the length and width of the maxillary permanent incisors of people in Sichuan were quite close to those of Chinese people. The ratio of the length of anatomical dental crowns to that of the developmental grooves was steady, and so was the ratio of the width of them. The angles of the developmental grooves were quite steady too. These may help us in making fixed prosthesis.
研究四川地区人群上颌恒中切牙的形态，为固定义齿的仿真修复提供指导。
选取58颗来自四川地区人群的上颌恒中切牙。本研究中所有牙齿均按一定标准选取。测量解剖冠的长度和宽度、发育沟的长度和宽度以及发育沟两侧形成的角度。
四川地区人群解剖冠的平均长度和宽度分别为(11.9±1.3)mm和(8.7±0.8)mm。发育沟的平均长度和宽度分别为(5.7±0.9)mm和(2.1±0.5)mm。近中发育沟和远中发育沟的长度以及宽度均无统计学差异。冠长与发育沟长的比值为2.1，冠宽与发育沟宽的比值为4.2。近中发育沟和远中发育沟两侧形成的角度分别为23°±4.7°和23°±5.7°。
上颌恒切牙的平均长度和宽度接近王氏报道，即四川地区人群上颌恒切牙的长度和宽度与中国人的较为接近。解剖牙冠长度与发育沟长度的比值稳定，宽度比值也稳定。发育沟的角度也很稳定。这些可能有助于我们制作固定义齿。
