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Correlation of Left Mandibular Third Molar Development and Chronological Age

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¼Û¹Î¼±, °­Á¤¹Î, ¼ÛÁ¦¼±, ÃÖÇüÁØ, ±è¼º¿À,
¼Ò¼Ó »ó¼¼Á¤º¸
¼Û¹Î¼± ( Song Min-Sun ) - Yonsei University College of Dentistry Department of Pediatric Dentistry
°­Á¤¹Î ( Kang Chung-Min ) - Yonsei University College of Dentistry Department of Pediatric Dentistry
¼ÛÁ¦¼± ( Song Je-Seon ) - Yonsei University College of Dentistry Department of Pediatric Dentistry
ÃÖÇüÁØ ( Choi Hyung-Jun ) - Yonsei University College of Dentistry Department of Pediatric Dentistry
±è¼º¿À ( Kim Seong-Oh ) - Yonsei University College of Dentistry Department of Pediatric Dentistry

Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº ÇÏ¾Ç ÁÂÃø Á¦3´ë±¸Ä¡ÀÇ Ä¡¾Æ ¼º¼÷µµ¿¡ ´ëÇÑ Çѱ¹ÀÎÀÇ Âü°í ÀڷḦ Á¦°øÇÏ°í, ÇÏ¾Ç ÁÂÃø Á¦3´ë±¸Ä¡ÀÇ ¼®È¸È­ ´Ü°è¿Í ¿¬´ë±âÀû ¿¬·É »çÀÌÀÇ »ó°ü°ü°è¸¦ ºÐ¼® ¹× Ä¡¾Æ ¹ßÀ° ´Ü°è¸¦ ÀÌ¿ëÇÏ¿© ¿¬·ÉÀ» ¿¹ÃøÇÒ ¼ö ÀÖÀ»Áö ¾Ë¾Æº¸´Â °ÍÀÌ´Ù.
¿¬¼¼´ëÇб³ Ä¡°ú´ëÇк´¿ø¿¡ ³»¿øÇÑ ¸¸ 7 ? 23¼¼ »çÀÌÀÇ °Ç°­ÇÑ È¯ÀÚ 1653¸íÀÇ Æijë¶ó¸¶ ¹æ»ç¼± »çÁøÀ» ÀÌ¿ëÇÏ¿© º¸¿ÏµÈ Demirjian ÀÇ ¹æ¹ýÀ¸·Î ÇÏ¾Ç ÁÂÃø Á¦3´ë±¸Ä¡ÀÇ ¹ßÀ° ´Ü°è¸¦ Æò°¡Çß´Ù. Á¦3´ë±¸Ä¡ÀÇ ¼®È¸È­´Â Æò±Õ 9¼¼¿¡ ½ÃÀÛÇÏ¿´À¸¸ç Ä¡°ü°ú Ä¡±ÙÀÇ Çü¼ºÀº °¢°¢ Æò±Õ 14¼¼, 21¼¼¿¡ ¿Ï¼ºµÇ¾ú´Ù. Ä¡°üÀÇ Çü¼º°ú Ä¡±Ù ±æÀÌ°¡ ¿Ï¼ºµÇ´Â ¹ßÀ° ´Ü°è¿¡¼­ ³²¼ºÀÌ ¿©¼ºº¸´Ù ´Ù¼Ò »¡¶úÀ¸¸ç, ±× Â÷ÀÌ´Â Åë°èÀûÀÎ À¯ÀǼºÀ» º¸¿´´Ù. ±× ¿ÜÀÇ ¹ßÀ° ´Ü°è¿¡¼­´Â ³²¼º°ú ¿©¼º »çÀÌÀÇ À¯ÀǹÌÇÑ Â÷ÀÌ´Â ¾ø¾ú´Ù. ÇÏ¾Ç ÁÂÃø Á¦3´ë±¸Ä¡°ú ¿¬·ÉÀº ¾çÀÇ»ó°ü°ü°è¸¦ ³ªÅ¸³ÂÀ¸¸ç, Á¦3´ë±¸Ä¡ÀÇ ¹ßÀ° ´Ü°è¸¦ ÀÌ¿ëÇÏ¿© ¿¬·ÉÀ» ¿¹ÃøÇÒ ¼ö ÀÖ¾ú´Ù.
Æijë¶ó¸¶ ¹æ»ç¼± »çÁøÀ» ÀÌ¿ëÇÑ ÇÏ¾Ç ÁÂÃø Á¦3´ë±¸Ä¡ÀÇ Ä¡¾Æ ¼º¼÷µµ Æò°¡ ¹æ¹ýÀ» ÅëÇÏ¿© Á¦3´ë±¸Ä¡ÀÇ ¹ßÀ° ½Ã±â¸¦ ºÐ¼®ÇÒ ¼ö ÀÖ¾ú°í, ÇÏ¾Ç ÁÂÃø Á¦3´ë±¸Ä¡°¡ ¿¬·ÉÀ» ¿¹ÃøÇÏ´Â ¼ö´ÜÀ¸·Î È°¿ëµÉ ¼ö ÀÖÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù.

The aim of this study is to evaluate the development of the left mandibular third-molar development with modified Demirjian method and its relation to chronological age.
A total of 1653 digital panoramic radiographs of healthy individuals aged between 7 and 23 years who visited Yonsei University Dental hospital were selected. The developmental status of the left mandibular third molars was assessed using dental maturity scoring proposed by Demirjian et al. The mean age of the first appearance of mineralization, complete crown formation, and complete root formation were around 9, 14, 21 years respectively. Statistically significant differences between males and females in the development stage of D and G were revealed that crown formation and root length completion were attained earlier in males than in females. There was significant positive relationship between age and third molar development in both sexes, and new formula was presented to estimate age of children and adolescents based on their developmental stages of third molars.
In this study, the use of left mandibular third molar as a developmental marker is appropriate, and age estimation can be attained with dental maturity stage.

Å°¿öµå

Left mandibular third molar; Developmental stage; Age estimation; Children and adolescents

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