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TWEED TRIANGLE AND SOFT-TISSUE CONSIDERATION WITH NORMAL OCCLUSION AND GOOD FACIAL PROFILE

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Abstract

°á·Ð
Á¤»ó±³ÇÕ°ú Á¶È­·Î¿î ¾È¸ð¸¦ °¡Áø Çѱ¹ ¼ºÀÎ Á¤»ó±³ÇÕÀÚ ³²³à °¢°¢ 30¸í¾¿À» ´ë»óÀ¸·Î Ãø
¸ðµÎºÎ¹æ»ç¼± »çÁøÀ» °èÃøºÐ¼®ÇÏ¿©, Tweed triangle°ú MerrifieldÀÇ ¿¬Á¶Á÷ ºÐ¼®¹ý,
Ricketts' E lineÀ» Âü°í·Î ÇÏ¿© °ñÁ¶Á÷°ú ¿¬Á¶Á÷¿¡ ´ëÇÑ ºÐ¼®À» ½ÃÇàÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú
¸¦ ¾ò¾ú´Ù.
1. º» ¿¬±¸¿¡¼­ »êÃâµÈ Çѱ¹ ¼ºÀÎ ³²³àÀÇ Ç¥ÁØÄ¡´Â FMA 24.13¡Æ, IMPA 94.42¡Æ, FMIA
61.44¡Æ, Z angle 73.95¡Æ, Total chin 14.91mm, Upper lip thickness 12.73mm, UL to E
line-1.56mm, LL to E line 0.28mmÀ¸·Î ³ªÅ¸³µ´Ù.
2. Çѱ¹ ¼ºÀÎÀÇ FMAÀÇ ³²ÀÚ Æò±ÕÀº 23.95¡Æ¿´°í ¿©ÀÚ Æò±ÕÀº 24.32¡Æ¿´´Ù. IMPA´Â ³²ÀÚ
¿¡¼­ 92.13¡Æ, ¿©ÀÚ¿¡¼­ 96.70¡Æ¿´À¸¸ç FMIA´Â ³²ÀÚ¿¡¼­ 63.90¡Æ, ¿©ÀÚ¿¡¼­ 58.98¡Æ·Î ³ªÅ¸
³µ´Ù.
3. Çѱ¹¼ºÀÎÀÇ Z angleÀÇ ³²ÀÚÆò±ÕÀº 74.87¡Æ, ¿©ÀÚÆò±ÕÀº 73.03¡Æ¿´°í, Total chinÀº ³²ÀÚ
¿¡¼­ 15.05mm, ¿©ÀÚ¿¡¼­ 14.76mm¿´À¸¸ç, Upper lip thickness´Â ³²ÀÚ¿¡¼­ 12.98mm, ¿©ÀÚ¿¡
¼­ 12.48mmÀ¸·Î ³ªÅ¸³µ´Ù. UL to E line¿¡¼­´Â ³²ÀÚÆò±Õ -1.67mm, ¿©ÀÚÆò±Õ -1.45mm¿´°í
LL to E lineÀÇ ³²ÀÚÆò±ÕÀº 0.17mm, ¿©ÀÚÆò±ÕÀº 0.40mm·Î ³ªÅ¸³µ´Ù.
4. º» ¿¬±¸¿¡¼­ °èÃøÇÑ 8°³Ç׸ñ¿¡ ´ëÇÑ ³²³à¼ºº°°£ÀÇ À¯ÀǼº °ËÁõ°á°ú, FMIA¿Í IMPA¿¡¼­
À¯ÀÇÇÑ Â÷°¡ ÀÖ¾ú´Ù(p<0.05).
5. IMPA, FMIA, Z angle, UL to E line, LL to E line¿¡ ´ëÇÑ »ó°ü°ü°è °ËÁõÀ» ½ÃÇàÇÑ °á
°ú, FMIA¿Í IMPA, FMIA¿Í Z angle, FMIA¿Í LL to E line, Z angle°ú UL to E line. Z
angle°ú LL to E line »çÀÌ¿¡ »ó°ü°ü°è°¡ ÀÖ´Â °ÍÀ¸·Î Æò°¡µÇ¾ú´Ù(p<0.05).
6. Çѱ¹Àΰú ÀϺ»ÀÎ, ¼­¾çÀÎÀ» ºñ±³ÇÑ °á°ú, Çѱ¹ÀÎÀÌ ¼­¾çÀο¡ ºñÇØ ÇϾÇÀüÄ¡ÀÇ µ¹Ãâµµ°¡
´õ ÄÇÀ¸¸ç, ÀϺ»Àο¡ ºñÇØ FMA°¡ ´õ ÀÛ¾Ò°í, Z angle°ú Total chinÀº Çѱ¹ÀÎÀÌ ÀϺ»Àο¡
ºñÇØ ÄÇÀ¸³ª, Upper lip thickness´Â ÀÛ¾Ò´Ù. ±×¸®°í RickettsÀÇ E line¿¡ ´ëÇÑ »óÇϼøÀÇ À§
Ä¡°¡ Çѱ¹ÀÎÀÌ ¼­¾çÀκ¸´Ù ´õ µ¹ÃâµÇ¾î ÀÖ¾ú´Ù.
#ÃÊ·Ï#
In this study, an effort was made to measure the Tweed triangle in assessing hard
tissue, at the same time, to use the Z angle and Ricketts' E line in assessing facial
esthetics. The cephalometric radiograms were taken from the Korean adult subjects, 21
to 27 years old, that consist of 30 males and 30 females with normal occlusion and
harmonious profile, 8 items were statistically analysed.
The results of this study were as follows :
1. In this study, standard values measured with 6 items in Korean were FMA 24.13¡Æ,
IMPA 94.42¡Æ, FMIA 61.14¡Æ, Z angle 73.95¡Æ, Total chin 14.91mm, Upper lip thickness
12.73mm, UL to E line -1.56mm and LL to E line 0.28mm.
2. The mean of the Tweed triangle in Korean males was FMA 23.95¡Æ, IMPA 92.13¡Æ
and FMIA 63.90¡Æ. In females, FMA 24.32¡Æ, IMPA 96.70¡Æ and FMIA 58.98¡Æ.
3. The mean of measurements of the soft tissue in Korean males was Z angle 74.87¡Æ,
Total chin 15.05mm, Upper lip thickness 12.98mm, UL to E line -1.67mm and LL to E
line 0.17mm. In females, Z angle 73.03¡Æ, Total chin 14.76mm and Upper lip thickness
12.48mm, UL to E line -1.45mm and LL to E line 0.40mm.
4. As compared 8 items by sex, there is no significant difference except the FMIA and
IMPA among the 8 items(p<0.05).
5. As verified the correlation of the IMPA, FMIA, Z angle, UL to E line and LL to E
line, there are correlations between FMIA and IMPA, FMIA and Z angle, FMIA and LL
to E line, Z angle and UL to E line, Z angle and LL to E line(p<0.05).
6. As compared with the present study, Japanese and Caucasian, the mandibular incisor
of Korean was proclined more than that of Caucasian, the FMA was smaller than in
Japanese. The Z angle and Total chin of Korean was larger than those of Japanese, but
the upper lip thickness of Korean was smaller than that of Japanese. The position of
the upper lip and lower lip to Ricketts' E line in Korean adults was protruded more
than those of Caucasian.

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