Vilella Beatriz de Souza, Vilella Oswaldo de Vasconcelos, Koch Hilton Augusto
Department of Orthodontics, School of Dentistry, Fluminense Federal University.
Braz Oral Res. 2006 Jan-Mar;20(1):70-5. doi: 10.1590/s1806-83242006000100013. Epub 2006 May 22.
The purpose of this research was to study the growth of the nasopharynx and adenoid development. Lateral cephalometric radiographs obtained from 320 white Brazilian subjects between 4 and 16 years of age were used. All the participants were nose breathers and none of them had previously undergone adenoidectomy. Tracings were made from the radiographs and cephalometric measurements were performed. The results showed that adenoid sagital thickness is larger in the age group 4 - 5 years and decreases progressively. There is a slight increase in the age group 10 - 11 years, but afterwards the decrease continues. However, the nasopharyngeal free airway space does not decrease in the age group 10 - 11 years, despite the increasing thickness of the adenoid. This is attributable to the downward displacement of the hard palate, resulting in an increase of the free airway space due to growth. Although the nasopharynx follows a growth pattern similar to that of the rest of the body, adenoid tissue does not. Adenoidal development seems to differ from that of other lymphatic tissues, showing a peculiar pattern that can be revealed when hypertrophy due to infections and allergies is eliminated.
本研究的目的是研究鼻咽部的生长及腺样体发育情况。使用了从320名4至16岁的巴西白人受试者获取的头颅侧位X线片。所有参与者均为经鼻呼吸者，且此前均未接受过腺样体切除术。从X线片上进行描图并进行头颅测量。结果显示，腺样体矢状厚度在4至5岁年龄组中较大，并逐渐减小。在10至11岁年龄组中有轻微增加，但之后继续减小。然而，尽管腺样体厚度增加，但在10至11岁年龄组中鼻咽部气道间隙并未减小。这归因于硬腭的向下移位，由于生长导致气道间隙增加。尽管鼻咽部的生长模式与身体其他部位相似，但腺样体组织并非如此。腺样体发育似乎与其他淋巴组织不同，呈现出一种特殊模式，当消除因感染和过敏引起的肥大时这种模式会显现出来。
