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Three-dimensional CT image study on the correction of gonial angle width enlarged on frontal cephalogram

Korean Journal of Orthodontics 2005³â 35±Ç 4È£ p.251 ~ 261
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Abstract

µÎºÎ¹æ»ç¼±±Ô°Ý»çÁøÀº ÀÛÀº Å©±âÀÇ ¹æ»ç¼±¿ø¿¡¼­ ¹æ»ç»óÀ¸·Î ¹æ»ç¼±ÀÌ ÆÛÁ®³ª°¨À¸·Î½á ÇÇ»çüÀÇ È®´ë¿Í ¿Ö°îÀÌ ºÒ°¡ÇÇÇÏ´Ù´Â ´ÜÁ¡ÀÌ ÀÖ´Ù. º» ¿¬±¸´Â µÎ ÀåÀÇ ¹æ»ç¼±»çÁøÀ» ¼­·Î Á÷°¢À¸·Î ÃÔ¿µÇÑ ÈÄ ¹æ»ç¼±ÀÇ ±âÇÏÇÐÀû ¼ºÁúÀ» ÀÌ¿ëÇÏ¿© ÁÂ¿ì ¿ì°¢ºÎ°£ Æø°æÀ» °è»êÇÒ °æ¿ì ½ÇÁ¦ Æø°æÀÇ »êÃâÀÌ °¡´ÉÇÑÁö ¾Ë¾Æº¸°íÀÚ ½ÃÇàµÇ¾ú´Ù. ¼ºÀÎ 40¸íÀ» ¿¬±¸´ë»óÀ¸·Î ÇÏ¿© µÎºÎÀÚ¼¼ÀçÇö±â¸¦ ÀÌ¿ëÇÏ¿© Ãø¸ðµÎºÎ¹æ»ç¼±»çÁø°ú Á¤¸ðµÎºÎ¹æ»ç¼±»çÁøÀ» ¼­·Î Á÷°¢À¸·Î ÃÔ¿µÇÑ ÈÄ Ãø¸ð»çÁø°ú Á¤¸ð»çÁø¿¡¼­ÀÇ È®´ëÀ²À» ÀÌ¿ëÇÏ¿© ½ÇÁ¦ ¿ì°¢ºÎ Æø°æÀ» »êÃâÇÑ ´ÙÀ½, °èÃøÄ¡ ¹× »êÃâÄ¡¸¦ 3Â÷¿ø CT¿µ»ó¿¡¼­ÀÇ °èÃøÄ¡¿Í °¢°¢ ºñ±³ ºÐ¼®ÇÏ¿´´Ù. ¿¬±¸°á°ú Á¤¸ðµÎºÎ¹æ»ç¼±»çÁø¿¡¼­ ¿ì°¢ºÎ Æø°æÀº, ÀÛ°Ô´Â 7.92 mm Å©°Ô´Â 11.31 mm±îÁö. Æò±Õ 9.10 mmÀÇ È®´ë¸¦ º¸¿´´Ù. Ãø¸ð ¹× Á¤¸ðµÎºÎ¹æ»ç¼±»çÁøÀ» ÀÌ¿ëÇÏ¿© ¾òÀº ¿ì°¢ºÎ Æø°æ º¸Á¤Ä¡¸¦ 3Â÷¿ø CT¿µ»ó¿¡¼­ ¾òÀº ±âÁØÄ¡¿Í ºñ±³ÇÑ °á°ú Æò±Õ 0.14 mmÀÇ ÀÛÀº ¿ÀÂ÷¸¦ º¸¿´À¸¸ç Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Æ Ãø¸ð ¹× Á¤¸ðµÎºÎ¹æ»ç¼±»çÁø ÃÔ¿µ ½Ã µÎºÎÀÚ¼¼ÀçÇö±â¸¦ ÀÌ¿ëÇÏ¿© ¼­·Î Á÷°¢À¸·Î ÃÔ¿µÇÒ °æ¿ì ½ÇÁ¦ ¿ì°¢ºÎ Æø°æÀ» °è»êÀ» ÅëÇØ »êÃâÇÒ ¼ö ÀÖÀ½À» º¸¿©ÁÖ¾ú´Ù. ÇÑÆí À̺ÎÆíÀ§·®°ú º¸Á¤¿ÀÂ÷´Â Åë°èÀûÀ¸·Î À¯ÀÇÇÑ »ó°ü¼ºÀ» º¸ÀÌÁö ¾Ê¾Æ ¾È¸éºñ´ëĪÀÌ ½ÉÇÑ °æ¿ì¿¡µµ º» º¸Á¤ ¹æ¹ýÀÌ À¯¿ëÇÏ°Ô »ç¿ëµÉ ¼ö ÀÖÀ½À» º¸¿©ÁÖ¾ú´Ù.

Enlargement is an inherent property of X-rays which occurs when straight lines diverge from small a focal spot. The purpose of the present study was to evaluate the valldity of the correction of gonial angle width enlarged on frontal cephalogram, using frontal and lateral cephalograms taken orthogonally from each other. In 40 adult individuals, frontal and lateral cephalograms were taken at a 90¡É angle using the Head Posture Aligner. The angle width was measured on the frontal cephalogram and subsequently, the corrected angle width was calculated using the magnification rate of two cephalograms. Measured and corrected angle widths were compared with the measurement from the 3D CT image. The measurement on the frontal cephalogram showed a 9.10 mm of enlargement on average, ranging from 7.92 to 11.31 mm. Corrected angle width measurement showed a 0.14 mm difference with the 3D CT image measurement, which was not statistically significant. The results of the study indicate that actual angle width can be approached through calculation using frontal and lateral cephalograms taken orthogonally with the help of the Head Posture Aligner. The study also showed that the magnitude of correction error did not show a significant correlation with the amount of menton deviation, and it suggests that the present correction method is valid even in individuals with severe facial asymmetry.

Å°¿öµå

Á¤¸ðµÎºÎ¹æ»ç¼±»çÁø;¿ì°¢ºÎ Æø°æ;È®´ë;º¸Á¤;Frontal cephalogram;Angle width;Enlargement;Correction

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