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Evaluation of the Developmental Age of Permanent Teeth by the Nolla Method

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Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº Nolla ¹æ¹ý¿¡ ±Ù°ÅÇÏ¿© ¼Ò¾Æ û¼Ò³â¿¡¼­ ³ªÀÌ¿Í ¼ºº°¿¡ µû¸¥ ¿µ±¸Ä¡ÀÇ Æò±Õ ¹ßÀ° ¿¬·ÉÀ» Æò°¡Çϱâ À§ÇÑ °ÍÀÌ´Ù.
¿¬¼¼´ëÇб³ Ä¡°ú´ëÇк´¿ø¿¡ ³»¿øÇÏ¿© Æijë¶ó¸¶ »çÁøÀ» ÃÔ¿µÇÑ ¾î¸°ÀÌ Áß 4¼¼¿¡¼­ 15¼¼ÀÇ ³²³à °¢°¢ 50¸íÀ» ´ë»óÀ¸·Î ÇÏ¿© 1,200¸íÀÇ Æijë¶ó¸¶ »çÁøÀ» ÈÄÇâÀûÀ¸·Î Á¶»çÇÏ¿´´Ù. 3¸íÀÇ Àß ÈÆ·ÃµÈ Á¶»çÀÚ°¡ Nolla ¹æ¹ý¿¡ ÀÇÇÏ¿© »ó, ÇÏ¾Ç ¿µ±¸Ä¡ÀÇ ¹ßÀ° ´Ü°è¸¦ Æò°¡ÇÏ¿´´Ù.
Á¶»çÀÚ °£ ½Å·Úµµ(ICC, intra-class correlation coefficient value)´Â 0.973À¸·Î ³ôÀº ÀÏÄ¡µµ¸¦ º¸¿´´Ù. Á¶»ç °á°ú¸¦ ¹ÙÅÁÀ¸·Î ¹ßÀ° ¿¬·ÉÀÇ Æò±Õ°ªÀ» °è»êÇÏ¿´´Ù. Ä¡°üÀÌ ¿Ï¼ºµÇ´Â Nolla 6´Ü°è´Â ³²¾Æ¿¡¼­´Â »ó¾Ç ÁßÀýÄ¡ºÎÅÍ Á¦2´ë±¸Ä¡±îÁö °¢°¢ 5.4, 6.4, 6.7, 7.5, 7.8, 4.6, 8.1¼¼¿¡¼­ ³ªÅ¸³µ°í, ÇϾǿ¡¼­´Â 4.8, 5.1, 6.0, 6.5, 7.2, 4.5, 8.0¼¼¿¡¼­ ³ªÅ¸³µ´Ù. ¿©¾Æ¿¡¼­´Â »ó¾Ç¿¡¼­ 5.3, 6.0, 6.3, 7.3, 7.7, 4.8, 8.1¼¼, ÇϾǿ¡¼­´Â 4.8, 5.1, 5.9, 6.5, 7.2, 5.0, 7.9¼¼¿¡ Ä¡°üÀÌ ¿Ï¼ºµÇ¾ú´Ù.
º» ¿¬±¸¸¦ ÅëÇÏ¿© ¿ì¸®³ª¶ó ¼Ò¾Æ û¼Ò³â ȯÀÚ¿¡¼­ÀÇ ¿µ±¸Ä¡ÀÇ Æò±Õ ¹ßÀ° ¿¬·ÉÀ» Æò°¡ÇÏ¿´´Ù. ¼ºÀå ÁßÀΠȯÀÚÀÇ Áø´Ü°ú Ä¡·á °èȹ ¼ö¸³¿¡ ÀÖ¾î º» ¿¬±¸ÀÇ °á°ú°¡ ÀÓ»óÀûÀ¸·Î À¯¿ëÇÏ°Ô Àû¿ëµÉ ¼ö ÀÖÀ» °ÍÀ¸·Î »ý°¢µÈ´Ù.

The developmental age of permanent teeth was evaluated in children and adolescents according to age and gender using the Nolla Method.
A retrospective study was performed on panoramic radiographs of 1,200 subjects aged 4-15 years, including 50 children for each age/gender group. Three well-trained examiners estimated the developmental stage of upper and lower permanent teeth using the Nolla Method. The inter-examiner reliability was excellent (intra-class correlation coefficient value = 0.973).
The mean developmental age was calculated. In boys, Nolla stage 6, indicated by crown completion, was seen in the central incisor, lateral incisor, canine, first premolar, second premolar, first molar, and second molar at 5.4, 6.4, 6.7, 7.5, 7.8, 4.6, and 8.1 years, respectively, in the maxilla and at 4.8, 5.1, 6.0, 6.5, 7.2, 4.5, and 8.0 years, respectively, in the mandible. In girls, Nolla stage 6 was seen at 5.3, 6.0, 6.3, 7.3, 7.7, 4.8, and 8.1 years, respectively, in the maxilla and at 4.8, 5.1, 5.9, 6.5, 7.2, 5.0, and 7.9 years, respectively, in the mandible.
In this study, the developmental age of permanent teeth was evaluated in Korean children and adolescents who visited Yonsei University Dental Hospital. This study may be helpful in diagnosis and treatment planning in the clinic.

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¿µ±¸Ä¡; ¹ßÀ° ¿¬·É; Nolla ¹æ¹ý
Permanent teeth; Developmental age; Nolla method

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