Joshi M R, Makhija P G
Br J Orthod. 1984 Apr;11(2):75-9. doi: 10.1179/bjo.11.2.75.
Plaster casts of 50 boys and 50 girls aged 3-6 years, from Gujarat, India, were studied to observe the pattern of spacing in the normal deciduous dental arches. Spaced type of dental arches were more common than closed type or 'no spaces' type. Spacing/no spacing appeared to behave independently between upper and lower arches and between the sexes. The amount of spacing was greater in males than in females. Bilateral anthropoid spaces did not exist as a single phenomenon. They occurred when some other spaces were also present. Anthropoid spaces were more in the upper arch than in the lower and more in males than in females. If anthropoid spaces occurred in the upper arch, they were frequently missing from the lower arch; this was observed more in females than males. Spacing on the left side was more than the right side. Spacing between the mandibular incisors was the greatest of all.
对来自印度古吉拉特邦50名3至6岁男孩和50名女孩的石膏牙模进行了研究，以观察正常乳牙列牙弓的间隙模式。牙弓间隙型比闭合型或“无间隙”型更为常见。间隙/无间隙在上、下牙弓之间以及性别之间似乎独立表现。男性的间隙量大于女性。双侧类人猿间隙并非作为单一现象存在。它们在存在其他一些间隙时出现。类人猿间隙在上牙弓比下牙弓更多，在男性比女性更多。如果类人猿间隙出现在上牙弓，在下牙弓则常常缺失；在女性中比男性中观察到的更多。左侧的间隙比右侧更多。下颌切牙之间的间隙是所有间隙中最大的。
