한국인 성인 하악골의 상행지 외융기(外隆起)에 대한 방사선 계측학적 연구

Abstract

[한글]

악 안면 기형 및 하악골의 수술시, 대부분의 경우 하악골 상행지에서 시술하게 되며 이때 하악공의 위치를 인지하는 것은 매우 중요하다.

그러나 실제 수술시 하악공은 해부학적 위치 때문에 직접 볼 수가 없어 이의 위치를 인지하는 데는 어려움이 많다. 그러므로 하악골 상행지 외면에 존재하는 외융기는 하악공의 위치를 정하는 해부학적 기준점으로 유용하리라 생각되어 저자는 총 58예의 한국인 성인의 하악골에서 상행지 외용기와 하악공을 관찰 계측하여 분석한 바 다음과 같은 결과를 얻었다.

1. 하악골 상행지 외융기 58예 중 47예(81.03%)에서 존재하였다.

2. 상행지 외융기가 존재하는 좌, 우의 하악골 94예에서, 하악공은 외융기로부터 5∼10mm 내에 50예(53.19%), 10∼15mm내에 25예(26.60%), 5mm 이내에 16예(17.02%), 15mm 이상에 3예(3.19%)의 순으로 나타났으며, 최장거리 16.7mm, 최단거리 1.9mm로써 평균거리는 8.4mm이었다.

3. 상행지 외융기를 중심으로, 외융기와 악각점의 연걸선에 대해 하악롱은 후방의 -7.5°에서 전방의 111°내에 산재하였고 평균 각도는 30.68°이며, 이는 20°∼40° 사이에 50예(53.19%), 0°∼20°사이에 21예(22.34%), 40°∼60° 사이에 16예(17.02%), 60°∼80° 사이에 3예(3.19%), -20°∼0° 사이에 2예(2.13%), 80°∼100°, 100°∼120°사이에 각 1예(1.06%)씩의 순으로 분포하였다.

4. 상행지 외융기와 악각점의 연장선을 긋고 이선에 수직인 선을 외융기에서 그어 상행지를 4뷴 하여 악각점으로부터 시계식 방향에 따라 구역 Ⅰ, Ⅱ, Ⅲ, Ⅳ로 정한 바, 구역 Ⅰ에 91예(96.81%), 구역 Ⅳ에 2예(2.13%), 구역 Ⅱ에 Ⅰ예(1.06%)의 순으로 존재하였고

구역 Ⅲ에는 하악공이 존재하지 않았다.

5. 상행지 외융기를 중심으로 5mm, 10mm, 15mm로 등분하여 각 구역을 소분한 바, 구역 Ⅰ의 5∼10mm 내에 49예(52.13%), 10∼15mm내에 24예(25.53%), 5mm내에 15예(15.96%), 15mm 밖에 3예(3.19%)의 순이었으며 구역 Ⅱ에 5mm내, 구역 Ⅳ의 5mm내, 10∼15mm내에 각 1예(1.06%)씩 분포하였다.

6. 상행지 외융기를 기준으로 폭 10mm, 하방길이 18mm, 경사각 30.68°의 평행 사변형 내에 총 하악공 94예중 92예(97.94%)가 존재하였다.

A STUDY ON THE RADIOGRAPHICAL MEASUREMENT OF THE LATERAL EMINENCE OF THE ASCENDING

RAMUS OF THE MANDIBLE IN KOREAN ADULTS

Jae Duck Choi, D.D.S.

Department of Dental Science, The Graduate School, Yonsei University.

(Directed by Assoicate Prof. Eui W. Lee, D.D.S., M.S.D., Ph.D.)

The lateral eminence on the lateral surface of ascending ramus of the mandible is

thought to be useful as a anatomic landmark for a guide to determine the position

of the mandibular foramen in surgery of the maxillofacial abnormalities.

The author has examined the 58 dried mandibles of Korean adults, measured and

analyzed the distance from the lateral eminence of ascending ramus to the

mandibular foramen.

The following results were obtained.

1. Among the 58 mandibles, there was the lateral eminence in 47 manidibles

(81.03%).

2. Among the 94 cases of the right and left mandibular ramus existing lateral

eminence, the highest incidence of the mandibular foramen (50 cases or 53.19%) was

in the area between 5 and 10mm radii and lowest (3 cases or 3.19%) was in the area

over 15mm radius from lateral eminence.

3. To the line from the lateral eminence to the gonion, in the clockwise

direction, the 50 cases(53.19%) of mandibular foramina located in the area between

20 and 40 degree, the 21 cases(22.34%) were in between 0 and 20 degree, the 16

cases (17.02%) were in between 60 and 80 degree.

4. The regional comparison of the distribution of the mandibular foramen, the

most(91 cases or 96.81%) of the mandibular foramina were located in anteriorly and

inferiorly (Region Ⅰ) to the lateral eminence.

5. In the 49 cases(52.13%) among the 94 cases, the mandibular foramina were

located in between 5 and 10mm radii from the lateral eminence in the anterior and

inferior area to the lateral eminence, namely Region Ⅰ. The 24 cases (25.53%) were

in between 10 and 15mm radii in the Region Ⅰ and the 15 cases (15.96%) were within

5mm radius in the Region Ⅰ.

6. The parallelogram-10mm in width, 18mm in length and 30.68 degree in antierior

and inferior inclination to the line from the lateral eminence to the

gonion-included the most(92 cases or 97.94%) mandibular foramina. Conclusively, the

mandibular foranmen was located in inferiorly and slightly anteriorly to the

lateral eminence of the ascending ramus in anatomical position.

[영문]

The lateral eminence on the lateral surface of ascending ramus of the mandible is thought to be useful as a anatomic landmark for a guide to determine the position of the mandibular foramen in surgery of the maxillofacial abnormalities.

The author has examined the 58 dried mandibles of Korean adults, measured and analyzed the distance from the lateral eminence of ascending ramus to the mandibular foramen.

The following results were obtained.

1. Among the 58 mandibles, there was the lateral eminence in 47 manidibles (81.03%).

2. Among the 94 cases of the right and left mandibular ramus existing lateral eminence, the highest incidence of the mandibular foramen (50 cases or 53.19%) was in the area between 5 and 10mm radii and lowest (3 cases or 3.19%) was in the area

over 15mm radius from lateral eminence.

3. To the line from the lateral eminence to the gonion, in the clockwise direction, the 50 cases(53.19%) of mandibular foramina located in the area between 20 and 40 degree, the 21 cases(22.34%) were in between 0 and 20 degree, the 16 cases (17.02%) were in between 60 and 80 degree.

4. The regional comparison of the distribution of the mandibular foramen, the most(91 cases or 96.81%) of the mandibular foramina were located in anteriorly and inferiorly (Region Ⅰ) to the lateral eminence.

5. In the 49 cases(52.13%) among the 94 cases, the mandibular foramina were located in between 5 and 10mm radii from the lateral eminence in the anterior and inferior area to the lateral eminence, namely Region Ⅰ. The 24 cases (25.53%) were in between 10 and 15mm radii in the Region Ⅰ and the 15 cases (15.96%) were within 5mm radius in the Region Ⅰ.

6. The parallelogram-10mm in width, 18mm in length and 30.68 degree in antierior and inferior inclination to the line from the lateral eminence to the gonion-included the most(92 cases or 97.94%) mandibular foramina. Conclusively, the mandibular foranmen was located in inferiorly and slightly anteriorly to the

lateral eminence of the ascending ramus in anatomical position.