A study on the bone thickness of midpalatal suture area for miniscrew insertion

미니스크류 식립 부위로서 정중 구개봉합부 골의 두께에 관한 연구

  • Kyung, Seung-Hyun (Department of Orthodontics Institute of Oral Health Science, Samsung Medical Center, College of Medicine, Sungkyunkawn University)
  • 경승현 (성균관대학교 의과대학 삼성서울병원 교정과)
  • Published : 2004.02.01

Abstract

The midpalatal suture area has some advantages for supporting miniscrews : it has no specific anatomical structure, it is composed of thick cortical bone, and covered with attached gingiva. So it is suitable area for inserting miniscrews. 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 midpalatal suture area transversely and within 25mm backward from the incisive foramen sagittaly is enough for inserting miniscrews.

상악에 미니스크류를 적용할 때 사용되는 정중 구개봉합부는 특별한 해부학적인 구조물이 존재하지 않으며 두꺼운 치밀뼈로 구성되고 각화치은으로 덮여 있는 장점이 있어서 미니스크류를 식립하기에 유리하다. 그러나 측모 두부 방사선 사진 상에서 보이는 정중 구개봉합부는 그 두께가 얇아 통상적으로 사용되는 미니스크류 식립시 골 천공의 위험과 안정성 에 문제가 있을 것으로 생각되기 쉽다. 본 연구는 미니스크류 식 립을 위 한 정중 구개봉합부의 수직골의 두께를 알아보기 위해 총 25명 (남 : 13, 여 : 12)의 20대 환자 전산화 단층촬영 상을 이용하였다. 전산화 단층촬영상의 횡단면으로부터 정중구개봉합부의 수직골 두께를 계측하였고 각 부위의 유의성을 조사하여 다음과 같은 결론을 얻었다. 1. 정중 구개 봉합부 골의 두께는 남녀간의 유의할 만한 차이를 보이지 않았다. 2. 관상단면에서 보았을 때 정중 구개 봉합부를 중심으로 좌우로 갈수록 두께가 감소하는 양상을 보였고 시상단면에서 보았을 때 절치공에서 후비극쪽으로 갈수록 두께가 감소하는 양상을 보였다. 3. 수평적으로 정중 구개 봉합부 좌우 3mm 이내, 전후방적으로 절치공 후방 25mm 까지는 골의 두께가 3-4mm이상으로 미니스크류 식립을 위한 수직적골 골의 두께가 충분하였다.

Keywords

References

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