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牙弓宽度在人一生中的变化是口腔正畸工作者非常关心的一个课题,它对于错(牙合)治疗计划的制定和治疗效果的维持均具有重要意义。 本研究试验对象分两组,一组从出生后6周到2岁,男28人,女33人;另一组从3岁到45岁,男15人,女15人。上、下颌牙弓宽度分别由两个人测量,精确到0.5mm。通过对牙弓宽度的纵向比较分析,得出以下结论:①从出生后6周到2岁,乳牙完全萌出前,上、下颌牙弓前段、后段宽度均有明显增加。②从3岁到13岁,上、下颌牙弓尖牙间宽度及磨牙间宽度均有显著增加,恒牙完全萌出后,牙弓宽度只有轻度增加,而且主要表现在尖牙间宽度。③下颌尖牙间宽度一般是在4个下颌切牙萌出后8岁时确定的。恒牙萌出后到45
Changes in dental arch width throughout the life of orthodontics workers are very concerned about a subject, which for the wrong (occlusion) treatment plan and the maintenance of treatment are of great significance. This study was divided into two groups, one group from 6 weeks after birth to 2 years old, 28 males and 33 females; the other group from 3 years to 45 years old, 15 males and 15 females. Upper and lower jaw arch width were measured by two people, accurate to 0.5mm. Through the longitudinal comparative analysis of dental arch width, the following conclusions are drawn: ① The width of anterior and posterior segments of dental arch of both upper and lower jaws increased significantly from 6 weeks after birth to 2 years old before full deciduous teeth were erupted. ② From 3 years old to 13 years old, the maxillary and mandibular arch canopies width and molars width increased significantly. After the permanent teeth were completely erupted, the dental arch width increased only slightly, and mainly manifested in the canine width. ③ mandibular canine width is generally determined after the eruption of 4 mandibular incisors 8 years old. Permanent eruption to 45 after eruption