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Validity of midsagittal reference planes constructed in 3D CT images

Korean Journal of Orthodontics 2007³â 37±Ç 3È£ p.182 ~ 191
Àü¿¹³ª, À̱âÇå, ȲÇý³²,
¼Ò¼Ó »ó¼¼Á¤º¸
Àü¿¹³ª ( Jeon Ye-Na ) - Àü³²´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú±³Á¤Çб³½Ç
À̱âÇå ( Lee Ki-Heon ) - Àü³²´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú±³Á¤Çб³½Ç
ȲÇý³² ( Hwang Hye-Nam ) - Àü³²´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú±³Á¤Çб³½Ç

Abstract

º» ¿¬±¸´Â µÎ°³¾Ç¾È¸é 3Â÷¿ø ÀÔü¿µ»óÀ» ÀÌ¿ëÇÑ Áø´Ü ½Ã À¯¿ëÇÑ Á¤Á߽ûó±âÁØÆò¸é ¼³Á¤¿¡ µµ¿òÀÌ µÇ°íÀÚ ½ÃÇàµÇ¾ú´Ù. ÀÓ»ó°Ë»ç¸¦ ÅëÇÏ¿© ¾È¸éÀÌ ÁÂ¿ì ´ëĪÀ¸·Î º¸ÀÌ´Â ¼ºÀÎ Á¤»ó±³ÇÕÀÚ¸¦ ´ë»óÀ¸·Î µÎ°æºÎ Àü»êÈ­´ÜÃþ»çÁøÀ» ÃÔ¿µÇÏ°í ÄÄÇ»ÅÍ ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© 3Â÷¿ø ÀÔü¿µ»óÀ¸·Î À籸¼ºÇÏ¿´´Ù. µÎ°³ÀÇ Á¤Á߽ûóºÎ¿¡ À§Ä¡ÇÏ´Â Cg, ANS, PNS, Ba, Op µîÀÇ °èÃøÁ¡°ú Po, Or·Î ±¸¼ºµÈ FH planeÀ» ÀÌ¿ëÇÏ¿© 6°³ÀÇ Á¤Á߽ûó±âÁØÆò¸é(Cg-ANS-Ba, Cg-ANS-Op, Cg-PNS-Ba, Cg-PNS-Op, FH{perp}(Cg, Ba), FH{perp}(Cg, Op))À» ¼³Á¤ÇÏ°í, ÁÂ¿ì ´ëĪ¼º ÀÇ Z, Fr, Fs, Zy, Mx, Msµî 6½ÖÀÇ °èÃøÁ¡À» ¼±Á¤ÇÑ ÈÄ, ¼³Á¤µÈ Á¤Á߽ûó±âÁØÆò¸é¿¡¼­ºÎÅÍ °¢ °èÃøÁ¡±îÁöÀÇ ÁÂÃø ¹× ¿ìÃø °Å¸®¸¦ °èÃøÇÏ°í t-°ËÁ¤À» ÅëÇÏ¿© À¯ÀÇÂ÷¸¦ °ËÁ¤ÇÏ´Â ÇÑÆí, Á¿ì Â÷ÀÌ°ªÀÇ Á¤µµ¸¦ ¼³Á¤µÈ ±âÁØÆò¸é°£¿¡ ºñ±³ÇÏ¿´´Ù. ¶ÇÇÑ Á¤Á߽ûó ±âÁØÆò¸é ¼³Á¤ÀÇ ÀçÇöµµ¸¦ ¾Ë¾Æº¸±â À§ÇÏ¿© Á¤Á߽ûó±âÁØÆò¸éÀÇ ¼³Á¤¿¡ »ç¿ëµÈ °èÃøÁ¡À» 2ÁÖ °£°ÝÀ¸·Î Àç°èÃøÇÏ°í ºñ±³ ºÐ¼®ÇÑ °á°ú, º» ¿¬±¸¿¡¼­ »ç¿ëµÈ ¸ðµç Á¤Á߽ûó±âÁØÆò¸éÀÌ µÎ°³¾Ç¾È¸éÀÇ 3Â÷¿øÀû ºÐ¼® ½Ã ±âÁØÆò¸éÀ¸·Î »ç¿ëµÉ ¼ö ÀÖÀ¸¸ç ƯÈ÷, Cg¿Í ANS¸¦ Æ÷ÇÔÇÑ Á¤Á߽ûó±âÁØÆò¸éÀÌ º¸´Ù Ÿ´çÇÔÀ» ½Ã»çÇÏ¿´´Ù.

Objective: The purpose of this study was to evaluate the validity of midsagittal reference (MSR) planes constructed in maxillofacial 3D images.

Methods: Maxillofacial computed tomography (CT) images were obtained in 36 normal occlusion individuals who did not have apparent facial asymmetry, and 3D images were reconstructed using a computer software. Six MSR planes (Cg-ANS-Ba, Cg-ANS-Op, Cg-PNS-Ba, Cg-PNS-OP, FH{perp}(Cg, Ba), FH{perp}(Cg, Op)) were constructed using the landmarks located in the midsagittal area of the maxillofacial structure, such as Cg, ANS, PNS, Ba and Op, and FH plane constructed with Po and Or. The six pairs of landmarks (Z, Fr, Fs, Zy, Mx, Ms), which represent right and left symmetry in the maxillofacial structure, were selected. Statistically significant differences of the right and the left measurements were examined through t-test, and the difference of the right and the left measurement was compared among the six MSR planes.

Results: The distances from the right and the left landmarks in each pair to each MSR plane did not show a statistically significant difference. The reproducibility of the landmark identification was excellent.

Conclusion: All the six planes constructed in this study can be used as a MSR plane in maxillofacial 3D analysis, particularly, the planes including Cg and ANS.

Å°¿öµå

µÎ°æºÎ Àü»êÈ­´ÜÃþ»çÁø;3Â÷¿ø ÀÔü¿µ»ó;Á¤Á߽ûó±âÁØÆò¸é
Maxillofacial computerized tomography;3D images;Midsagittal reference plane

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