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背景:牙弓后段长度不足与错畸形的形成和发展密切相关。目的:测量兰州地区成人个别正常牙弓后段长度。方法:在兰州地区甘肃籍在校大学生中选择 18-24 岁正常102 例(男 47 例,女 55 例),平均年龄(19.33±2.67)岁,拍摄头颅侧位片,按照下颌平面角分为高角组(>32°)、低角组(<22°)、均角组(22°-32°)3 组。分别测量受试者上、下颌牙弓后段长度,并进行性别、组内、组间比较分析。结果与结论:上颌牙弓后段长度男性稍大于女性,差异无显著性意义(P > 0.05)。下颌牙弓后段长度男性稍大于女性,差异无显著性意义(P > 0.05)。组间比较发现,男性低角型下颌牙弓后段长度显著大于男性高角型下颌牙弓后段长度,差异有显著性意义(P < 0.05)。可以初步说明牙弓后段在发育过程中不受性别影响,不同垂直骨面型、不同性别成人个别正常牙弓后段长度存在差异
Background: Inadequate length of dental arch is closely related to the formation and development of malocclusion. Objective: To measure the length of posterior segments of adult dental arch in Lanzhou. Methods: In Lanzhou, Gansu college students were selected from the age of 18-24 years old normal 102 cases (47 males and 55 females), mean age (19.33 ± 2.67) years old, filming the cephalometric slices, according to the mandibular plane angle There were 3 groups of high angle group (> 32 °), low angle group (<22 °) and average angle group (22 ° -32 °). The lengths of the posterior segment of the upper and lower arch of the subject were respectively measured, and the gender, intra-group and inter-group comparative analysis were performed. RESULTS AND CONCLUSION: The length of posterior segment of maxillary arch was slightly longer than that of female, with no significant difference (P> 0.05). The length of the posterior segment of the mandibular arch was slightly larger than that of the female, with no significant difference (P> 0.05). The comparison between groups showed that the length of the posterior segment of the dental arch of the male low-angle mandible was significantly larger than that of the posterior segment of the mandibular high-angle mandibular mandible (P <0.05). Can be initially described in the development of dental arch during the non-gender-dependent, different vertical bone surface type, different sex, the individual posterior segment of the arch length of the normal individual differences