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Reproducibility of asymmetry measurements of the mandible in three-dimensional CT imaging

Korean Journal of Orthodontics 2008³â 38±Ç 5È£ p.314 ~ 327
±è°í¿î, ±èÀçÇü, À̱âÇå, ȲÇö½Ä,
¼Ò¼Ó »ó¼¼Á¤º¸
±è°í¿î ( Kim Go-Woon ) - Àü³²´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
±èÀçÇü ( Kim Jae-Hyung ) - Àü³²´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­»ý¸®Çб³½Ç
À̱âÇå ( Lee Ki-Heon ) - Àü³²´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú±³Á¤Çб³½Ç
ȲÇö½Ä ( Hwang Hyeon-Shik ) - Àü³²´ëÇб³ Ä¡ÀÇÇבּ¸¼Ò

Abstract

º» ¿¬±¸´Â ÇϾǰñ 3Â÷¿ø ÀÔü¿µ»ó¿¡¼­ ºñ´ëĪ°èÃøÇ׸ñµéÀÇ ÀçÇöµµ ºñ±³¸¦ ÅëÇÏ¿© ¾È¸éºñ´ëĪ Áø´Ü ½Ã À¯¿ëÇÑ °èÃøÁ¡ ¼³Á¤¿¡ µµ¿òÀÌ µÇ°íÀÚ ½ÃÇàµÇ¾ú´Ù. 40¸íÀÇ µÎ°æºÎ Àü»êÈ­´ÜÃþ»çÁøÀ» ÀÌ¿ëÇÏ¿© »ý¼ºÇÑ 3Â÷¿ø ¿µ»ó¿¡¼­ ÇϾǰñ ÇüŸ¦ °áÁ¤Áþ´Â ºÎÀ§·Î ÇϾǰúµÎ, ÇϾǿ찢ºÎ, ÇϾÇÁ¤Áߺθ¦ ¼±ÅÃÇÏ°í °¢ ºÎÀ§ÀÇ ¼¼ºÎÀ§Ä¡¿¡ µû¶ó, ±×¸®°í ÃøÁ¤ ½Ã º¸´Â °¢µµ¿¡ µû¶ó ±¸ºÐÇÏ¿© ÇϾǰúµÎÀÇ °æ¿ì Cdsup_sup µî 6°³, ÇϾǿ찢ºÎÀÇ °æ¿ì Goinf_lat µî 10°³, ÇϾÇÁ¤ÁߺÎÀÇ °æ¿ì Me_ant, Me_inf µî ÃÑ 18°³ÀÇ °èÃøÁ¡À» ¼³Á¤ÇÑ ÈÄ À̸¦ ÀÌ¿ëÇÏ¿© ÇϾǰñ ºñ´ëĪ ½Ã Á¿ì Â÷À̸¦ º¸ÀÏ ¼ö ÀÖ´Â 25°³ÀÇ °èÃøÇ׸ñÀ» ¼³Á¤ ¹× °èÃøÇÑ ÈÄ Á¶»çÀÚ°£ ¹× Á¶»çÀÚ³»ÀÇ ÀçÇöµµ¸¦ ºñ±³ Æò°¡ÇÏ¿´´Ù. Á¶»çÀÚ°£ ÀçÇöµµÀÇ °æ¿ì 25°³ÀÇ °èÃøÇ׸ñ Áß 3°³¸¦ Á¦¿ÜÇÑ ¸ðµç °èÃøÇ׸ñ¿¡¼­, Á¶»çÀÚ³» ÀçÇöµµÀÇ °æ¿ì 2°³ Ç׸ñÀ» Á¦¿ÜÇÑ ¸ðµç °èÃøÇ׸ñ¿¡¼­ ³ôÀº ÀçÇöµµ¸¦ º¸¿´´Ù. ¾Æ¿ï·¯ º» ¿¬±¸¿¡¼­ ¼³Á¤ÇÑ 18°³ÀÇ °èÃøÁ¡ Áß Gomid_lat, Gomid_obl°¡ Æ÷ÇÔµÈ °èÃøÇ׸ñÀÌ Á¶»çÀÚ°£ ¹× Á¶»çÀÚ³» ÀçÇöµµ°¡ ¶³¾îÁö´Â °æÇâÀ» º¸¿´´Ù. ÀÌ»óÀÇ ¿¬±¸ °á°ú º» ¿¬±¸¿¡¼­ »ç¿ëµÈ 18°³ÀÇ °èÃøÁ¡ Áß 16°³ÀÇ °èÃøÁ¡ (°úµÎ¸¦ ³ªÅ¸³»´Â Cdsup_sup, Cdlat_ant, Cdlat_lat, Cdpost_lat, Cdpost_post, S, ÇϾǿ찢ºÎ¸¦ ³ªÅ¸³»´Â Goinf_lat, Goinf_inf, Golat_ant, Golat_lat, Gopost_lat, Gopost_post, Ag_lat, Ag_inf, ÇϾÇÁ¤Áߺθ¦ ³ªÅ¸³»´Â Me_ant, Me_inf)Àº ³ôÀº ÀçÇöµµ¸¦ º¸À̹ǷΠÀü»êÈ­´ÜÃþ»çÁøÀ» ÀÌ¿ëÇÑ ÇϾǰñ 3Â÷¿ø ¿µ»ó¿¡¼­ ¾È¸éºñ´ëĪ ȯÀÚÀÇ Áø´Ü¿¡ À¯¿ëÇÏ°Ô »ç¿ëµÉ ¼ö ÀÖÀ½À» ½Ã»çÇÏ¿´´Ù. (´ëÄ¡±³Á¤Áö 2008;38(5):314-327)

Objective: The purpose of this study was to evaluate the reproducibility of measurements representing asymmetry of the mandible and to identify which landmarks would be more useful in 3-dimensional (3D) CT imaging.
Methods: Facial CT images were obtained from forty normal occlusion individuals. Eighteen landmarks were established from the condyle, gonion, and menton areas, and 25 measurements were constructed to represent asymmetry of the mandible; 8 for ramus length, 12 for mandibular body length, 1 for condylar neck length, 2 for frontal ramal inclination, and 2 for lateral ramal inclination. Inter- and intra-examiner reproducibility of the measurements was evaluated.

Results: Inter-examiner reproducibility of the measurements proved to be high except for 3 measurements. Intra-examiner reproducibility also proved to be high except for 2 measurements. Inter- and intra-examiner reproducibility of the measurements including Gonion proved to be low.

Conclusions: The results of the present study indicate that the landmarks and measurements constructed in 3D CT images can be used for the diagnosis of facial asymmetry. (Korean J Orthod 2008;38(5):314-327)

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¾È¸éºñ´ëĪ;3Â÷¿ø ¿µ»ó;°èÃøÁ¡;ÀçÇöµµ
Facial asymmetry;3D CT;Landmarks;Reproducibility

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