The midpalatal suture area has some advantages: for supporting miniscrews it-has no specific anatomical structure, it is composed of thick cortical lone, and covered with attached gingiva. So it is suitable area for inserting rniniscrews. However, the midpalatal suture area appears thinner when seen in ceph. As a result, Clinicians can misunderstand that inserting miniscrews cause the problem, both the risk of perforation and the decrease of stability. The purpose of this article is measuring the vertical bone thickness of the midpalatal suture area for inserting miniscrews. The total of 25patient. (male : 13, female : 12), who are in their twenties, were taken CT. The vertical bone thickness of the midpalatal suture area was measures from the transverse section of CT. As a result, We reached a conclusion from the differences of each area. It is as follows
1. There is no significant difference between the thickness of male group and that of female group.
2. In coronal section, Bone thickness becomes thinner from the midpalatal suture to Left & Right side, in sagittal section, Bone thickness becomes thinner from incisive foramen to PNS.
3. The area that is within 3mm of left and right from the nudpalatal suture area transversely and within 25mm backward from the incisive foramen sagittaly is enough for inserting miniscrews.
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