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THE MEDIAL SIGMOID DEPRESSION : Its Anatomic rind Radiographic Considerations

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°­º´Ã¶/Byung-Cheol Kang

Abstract

ÇϾÇÀýÈç ³»Ãø ÇÔ¿ä´Â ÇϾǰñÀÇ ÇϾÇÀýÈç Àü, ³», ÇϹ濡 ÇÔ¸ôµÈ ¾ç»óÀ¸·Î ³ªÅ¸³ª´Â Á¤»ó
ÇغÎÇÐÀû ±¸Á¶¹°ÀÌ´Ù. ÀÌ ±¸Á¶¹°¿¡ ´ëÇÑ ÇغÎÇÐÀû Á߿伺À̳ª, ¹ß»ýÀÌ ¼±ÃµÀûÀΰ¡ ¾Æ´Ï¸é Ãâ
»ýÈÄ ¹ß»ýµÇ´Â °ÍÀΰ¡¿¡ ´ëÇÏ¿©´Â ¾Ë·ÁÁ® ÀÖÁö ¾Ê´Ù. Langlais´Â ÇϾÇÀýÈç³»ÃøÇÔ¿ä´Â Æijë
¶ó¸¶¹æ»ç¼±»çÁø»ó¿¡¼­ ÀýÈç, ¶Ç´Â ¼Ò°ø ¸ð¾çÀÇ ¹æ»ç¼±Åõ°ú»óÀ¸·Î ³ªÅ¸³­´Ù°í ÇÏ¿´Áö¸¸ ÀÌ´Â
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¼­´Â ÀÍ»óÆÇ, ¿¬±¸°³, ±âµµ, ±×¿Ü ´Ù¸¥ Á¶Á÷µîÀÇ ÁßøÀ¸·Î ÀÎÇÏ¿©, ÀÌ ±¸Á¶¹°ÀÇ ¹ß°ß ºóµµ°¡
³·¾ÆÁø´Ù. ÀúÀÚ´Â 78°³ÀÇ ÇϾǰñ¿¡¼­ÀÇ ¹ß»ýºóµµ, À§Ä¡, Å©±âµîÀ» Á¶»çÇÏ°í, À̸¦ Æijë¶ó¸¶
¹æ»ç¼±»çÁøÃÔ¿µÇÏ¿© ±× ¹ß»ý ºóµµ¸¦ Á¶»çÇÏ¿´À¸¸ç, Ä¡°úȯÀÚ 500¸íÀÇ Æijë¶ó¸¶ ¹æ»ç¼±»çÁø
¿¡¼­ÀÇ ¹ß»ýºóµµµµ ¾Ë¾Æ º¸¾Ò´Ù.
1. ÇϾǰñ¿¡¼­ÀÇ ¹ß»ýºóµµ´Â 62%¿´´Ù(ÆíÃø¼º 28%, ¾çÃø¼º 33%).
2. ÇϾǰñÀÇ Æijë¶ó¸¶ ¹æ»ç¼±»çÁø»óÀÇ ¹ß»ýºóµµ´Â 33%¿´´Ù(ÆíÃø¼º 14%, ¾çÃø¼º 19%).
3. ÇϾÇÀýÈç³»ÃøÇÔ¿äÀÇ Á᫐ À§Ä¡´Â ÇϾÇÀýÈç ÇϹæ 6.0§®, Àü¹æ 3.8§®¿´´Ù.
4. Å©±â´Â ¼öÁ÷ 7.8§®, ¼öÆò 8.3§®ÀÌ¿´´Ù.
5. Ä¡°úȯÀÚµéÀÇ Æijë¶ó¸¶ ¹æ»ç¼±»çÁø»ó¿¡¼­ÀÇ ¹ß»ý ºóµµ´Â 24%¿´´Ù(ÆíÃø¼º 18%, ¾çÃø¼º
7%).
#ÃÊ·Ï#
Summary and Conclusion
A foramen-like radiolucency was occasionally observed on a panoramic radiographs in
the upper ramus just below and anterior to the mandibular sigmoid notch. The medial
sigmoid de-pression is an anatomic radiolucency which can be observed on a number of
panoramic radio-graphs in the upper ramus just below and anterior to the mandibular
sigmoid notch. The radio-lucent shadow was first reported by Langlais et at. (1983)
The anatomic significance of this depression on the mandible is not determined. Though
it can be observed at the age of three, whether the origin of the depression is
congenital or developmental is a problem to be solved.
There was a difference in incidence between mandibular specimen's radiographs and
the patient's radiographs. The difference may be due to the following considerations:
The radio-lucent airway shadow, pterygoid plate, soft palate are superimposed the
sigmoid notch region. And there are soft tissues and other anatomies which are
superimposed the sigmoid notch region.
Seventy-eight mandibles (of dry skulls) were examined. The observable incidence,
location, and size of the depression were recorded. Some of the representative specimens
were photo-graphed. The specimens were radiographed with Veraview panoramic
machine (J. Morita Co.). The observable incidence of the medial sigmoid depression was
compared with the radiographic incidence. The results are as follows :
1. The observable incidence of the medial sigmoid depression was 62% (28%
unilateral, 33% bilateral).
2. The radiographic incidence of the medial sigmoid depression was 33% (14%
unilateral, 19% bilateral).
3. The center of the medial sigmoid depression was located 6.0§® below and 3.8mm
anterior to the sigmoid notch (on the skulls).
4. The mean size of the medial sigmoid depression was 7.8§® in vertical and 8.3§® in
horizon-tal length.
5. The radiographic incidence of the depression in dental patients was 24% (18%
unilateral, 7% bilateral).

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