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Analysis of the Characteristics of First Permanent Molars with Delayed Eruption

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ÀÌÈ£¼± ( Lee Ho-Sun ) - Kyung Hee University School of Dentistry Department of Pediatric Dentistry
ÀÌ°íÀº ( Lee Ko-Eun ) - Kyung Hee University School of Dentistry Department of Pediatric Dentistry
±è¹Ì¼± ( Kim Mi-Sun ) - Kyung Hee University School of Dentistry Department of Pediatric Dentistry
³²¿ÁÇü ( Nam Ok-Hyung ) - Kyung Hee University School of Dentistry Department of Pediatric Dentistry
ÀÌÈ¿¼³ ( Lee Hyo-Seol ) - Kyung Hee University School of Dentistry Department of Pediatric Dentistry
ÃÖ¼ºÃ¶ ( Choi Sung-Chul ) - Kyung Hee University School of Dentistry Department of Pediatric Dentistry

Abstract

Á¦1´ë±¸Ä¡´Â ¾Ç¾È¸é ºÎÀ§ÀÇ ¹ß´Þ°ú ±³ÇÕ¿¡ Áß¿äÇÑ ±â´ÉÀ» °®´Â´Ù. À̹ø ¿¬±¸ÀÇ ¸ñÀûÀº ¸ÍÃâ Áö¿¬µÈ Á¦1´ë±¸Ä¡ÀÇ À¯Çü¿¡ µû¸¥ Ư¡¿¡ ´ëÇØ Á¶»çÇÏ°í Ä¡¾ÆÀÇ ¹ßÀ° »óÅ ¹× ¼±ÃµÀû °á¼Õ°úÀÇ ¿¬°ü¼º¿¡ ´ëÇØ ¾Ë¾Æº¸°íÀÚ ÇÏ´Â °ÍÀÌ´Ù. ¸ÍÃâ Áö¿¬µÈ Á¦1´ë±¸Ä¡¸¦ °¡Áø ¸¸ 8 ¼¼ ȯÀÚ¸¦ ¹°¸®Àû Àå¾Ö°¡ ÀÖ´Â 75¸í°ú ¾ø´Â 77¸íÀ¸·Î ±¸ºÐÇÏ¿´´Ù. Æijë¶ó¸¶ ¹æ»ç¼± »çÁø¿¡¼­ ¸ÍÃâ Áö¿¬µÈ ¿µ¿ªÀÇ Á¦1´ë±¸Ä¡ ¹× Á¦2 ´ë±¸Ä¡ÀÇ ¹ßÀ° »óŸ¦ Nolla ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© ºÐ¼®ÇÏ¿´´Ù. ¼±ÃµÀû °á¼Õ°ú Á¦1´ë±¸Ä¡ ¸ÍÃâ Áö¿¬ ¿µ¿ª°úÀÇ ¿¬°ü¼ºµµ ¾Ë¾Æº¸¾Ò´Ù. Á¦1´ë±¸Ä¡ ¸ÍÃâ Áö¿¬Àº »ó¾Ç ´Üµ¶À¸·Î ¸¹ÀÌ Á¸ÀçÇß´Ù. ¹°¸®Àû Àå¾Ö·Î ÀÎÇÑ ¸ÍÃâ Áö¿¬Àº ³²ÀÚ¿¡¼­ ÆíÃø¼ºÀ¸·Î ¸¹ÀÌ ³ªÅ¸³µ°í, ¹°¸®Àû Àå¾Ö°¡¾ø´Â °æ¿ì¿¡´Â ¿©ÀÚ¿¡¼­ ¾çÃø¼ºÀ¸·Î ´õ ¸¹ÀÌ ³ªÅ¸³µ´Ù. ¸ÍÃâ Áö¿¬µÈ Á¦1´ë±¸Ä¡¿¡¼­ ¹ßÀ° Áö¿¬ÀÌ ³ªÅ¸³µ°í, ¹°¸®Àû Àå¾Ö°¡ ¾ø´Â °æ¿ì¿¡´Â ÀÎÁ¢ÇÑ Á¦2´ë±¸Ä¡ÀÇ ¹ßÀ° Áö¿¬°ú ÇØ´ç ¿µ¿ªÀÇ ³ôÀº ¼±ÃµÀû °á¼ÕÄ¡ ºñÀ²À» º¸¿´´Ù. Á¦1´ë±¸Ä¡ÀÇ ¸ÍÃâ Áö¿¬ÀÌ °üÂûµÈ´Ù¸é, Ä¡¾ÆÀÇ ¹ßÀ° »óÅÂ¿Í ¼±ÃµÀû °á¼ÕÄ¡¿¡ ´ëÇÑ ÁÖ±âÀûÀÎ ÀÓ»óÀû, ¹æ»ç¼±ÇÐÀû Æò°¡°¡ ÇÊ¿äÇÒ °ÍÀÌ´Ù.

The first permanent molars play a key role in maxillofacial development and occlusion. The purpose of this study is to investigate the characteristics and development stages of first molars with delayed eruption, and to evaluate their associations with congenital missing teeth. Eight-year-old patients who had delayed eruption in their first molars were classified into 75 patients with physical barriers and 77 patients without physical barriers. The development stages of the first and second molars in the delayed area were analyzed using Nolla method from the panoramic radiographs.
The relationship between congenital missing teeth and delayed area was also investigated. Delayed eruption of first molars were more common in the maxilla alone. With the presence of physical barriers, male patients showed higher frequency in unilateral cases, while female patients had higher bilateral cases when there was no physical barrier. Delayed development of first molars were observed in delayed eruption area. In the absence of physical barriers, adjacent second molars were also developed slowly and the incidence of congenital missing teeth was high in delayed area. If first molars with delayed eruption are observed, clinical and radiographical follow-ups are necessary for the evaluation of their developmental stages and congenital missing teeth.

Å°¿öµå

First permanent molar; Delayed eruption; Congenital missing; Nolla method

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