Timms D J
Am J Orthod. 1980 May;77(5):500-7. doi: 10.1016/0002-9416(80)90129-3.
This investigation was undertaken to examine the effect of rapid maxillary expansion horizontally and posterior to the dental arch, there being some doubt that the expansion would be carried in this dimension and whether dilation of the non-tooth-bearing bones (palatines and sphenoidal pterygoid processes) was possible. The increases in the intermolar arch widths and the interpterygoid hamular widths were recorded in a group of thirty-two orthodontic patients. (twelve male and twenty female, aged 8 to 24 years), before and after rapid maxillary expansion. The mean percentage increase in interhamular widths to intermolar widths was 58 percent (range, 35 percent to 89 percent). The correlation between the relative increases was weak (r = +0.55). A slight reduction in the percentage increases in interhamular widths to intermolar widths as age advanced suggested an age factor, but the correlation was very weak (r = -0.33). From this evidence, it would seem that rapid maxillary expansion will separate the palatine bones and splay outward the pterygoid processes of the sphenoid bone.
本研究旨在探讨上颌快速扩弓在牙弓水平及后方的效果，此前对于该方向的扩弓以及无牙颌骨（腭骨和蝶骨翼突）是否能够扩张存在一些疑问。记录了一组32例正畸患者（12例男性和20例女性，年龄8至24岁）在快速上颌扩弓前后的磨牙间牙弓宽度和翼突间钩宽度的增加情况。翼突间宽度相对于磨牙间宽度的平均增加百分比为58%（范围为35%至89%）。相对增加量之间的相关性较弱（r = +0.55）。随着年龄增长，翼突间宽度相对于磨牙间宽度的增加百分比略有降低，提示存在年龄因素，但相关性非常弱（r = -0.33）。从这些证据来看，上颌快速扩弓似乎会使腭骨分离，并使蝶骨翼突向外展开。
