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RELATIONSHIP BETWEEN THE DEVELOPMENT STAGE AND CHRONOLOGICAL AGE, AND THE CHANGES OF TOOTH POSITION IN RELATION TO THE TOOTH DEVELOPMENT ON MANDIBULAR PERMANENT TEETH

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Abstract

¿¬·É°ú Ä¡¾Æ ¹ßÀ°»óÅ ´Ü°è¿ÍÀÇ »ó°ü°ü°è, Ä¡¾ÆÀÇ ¹ßÀ°¿¡ µû¸¥ Ä¡¾ÆÀÇ À̵¿»óŸ¦ Æò°¡Çϱâ À§ÇÏ¿© ÃÖ±Ù 5³â À̳»¿¡ °æºÏ´ëÇб³ º´¿ø¿¡ ³»¿øÇÑ ¾Æµ¿(³²¾Æ 446¸í, ¿©¾Æ 326¸í)ÀÇ Æijë¶ó¸¶ ¹æ»ç¼±»çÁøÀ» ´ë»óÀ¸·Î ÇÏ¿©, MoorreesÀÇ ±âÁØ¿¡ ÀÇÇÏ¿© ÇÏ¾Ç ¿µ±¸Ä¡¾ÆÀÇ ¹ßÀ°´Ü°è¸¦ Æò°¡ÇÑÈÄ, ¹ßÀ°´Ü°è¿Í ¿¬·É, Ä¡Á¶°ñ³» Ä¡¾ÆÀÇ À§Ä¡¸¦ Æò°¡ÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù. Ä¡¾ÆÀÇ ¹ßÀ°½Ã±â´Â Ä¡°üÀÌ ¿Ï·áµÉ ¶§±îÁö ³², ¿©ÀÇ Â÷ÀÌ°¡ ¾ø¾úÀ¸³ª, Ä¡±ÙÇü¼ºÀÌ µÇ¸é¼­ ºÎÅÍ´Â ³²¾Æº¸´Ù ¿©¾Æ¿¡¼­ ´õ »¡¸® ¹ßÀ°µÇ´Â °æÇâÀ» ³ªÅ¸³»¾ú´Ù. Ä¡°üÇü¼ºÀÇ ¿Ï·á½ÃÁ¡ÀÇ Æò±Õ¿¬·ÉÀº ³²¾Æ ¿©¾Æ °¢°¢¿¡¼­ ÁßÀýÄ¡ 3.71, 4.05¼¼. ÃøÀýÄ¡ 4.44, 4.60¼¼. °ßÄ¡ 5.35, 5.11¼¼. Á¦1¼Ò±¸Ä¡ 6.62, 6.36¼¼. Á¦2¼Ò±¸Ä¡ 7.36, 7.17¼¼. Á¦1´ë±¸Ä¡ 3.51, 3.69¼¼. Á¦2´ë±¸Ä¡ 7.90, 7.64¼¼ À̾ú°í, Ä¡±Ù´ÜÀÌ Æó¼âµÇ±â Àü´Ü°èÀÎ A_(l/2)´Â ÁßÀýÄ¡ 8.70, 8.18¼¼. ÃøÀýÄ¡ 9.55,8.99¼¼. °ßÄ¡ 12.48, 11.60¼¼, Á¦1¼Ò±¸Ä¡ 12.30, 12.01¼¼. Á¦2¼Ò±¸Ä¡ 12.19, 12.26¼¼. Á¦1´ë±¸Ä¡ 9.12, 8.87¼¼. Á¦2´ë±¸Ä¡ 12.59, 12.45¼¼ À̾ú´Ù. Ä¡Á¶°ñ³»ÀÇ ±³µÎÁ¡ À§Ä¡´Â Ä¡°üÇü¼º ¿Ï·á½Ã±îÁö´Â °ÅÀÇ º¯È­°¡ ¾ø¾úÀ¸³ª, Ä¡±ÙÀÌ Çü¼ºµÊ¿¡ µû¶ó ºü¸£°Ô ±³ÇÕÆò¸éÀ» ÇâÇØ À̵¿ÇÏ¿´°í, Ä¡±ÙÇü¼º ¿Ï·á´Ü°è(Rc)¿¡¼­ ´Ù½Ã ¿òÁ÷ÀÓ ¾øÀÌ Á¤Ã¼µÇ¾ú´Ù. Ä¡±Ù´ÜÀÇ À§Ä¡´Â Ä¡°üÇüÁ¤ ½ÃÀÛºÎÅÍ Ä¡±Ù ¨ù Çü¼º ½Ã±îÁö ÀÏÁ¤ÇÑ À§Ä¡¿¡ À¯ÁöµÇ¾úÀ¸³ª,±× ÈÄ¿¡ ±Þ°ÝÇÏ°Ô ±³ÇÕ¸é ÂÊÀ¸·Î À̵¿ÇÏ¿´°í, Ä¡±Ù¨ú Çü¼º½ÃÁ¡ºÎÅÍ ºñ±³Àû ÀÏÁ¤ÇÑ À§Ä¡¿¡ À¯ÁöµÇ¾ú´Ù. Ä¡¾ÆÀÇ ¼®È¸È­°¡ ½ÃÀ۵Ǵ ÃʱâÀÇ Ä¡¹è À§Ä¡´Â °ßÄ¡°¡ °¡Àå ÇϹ濡 À§Ä¡ÇÏ¿´À¸¸ç, ±× ´ÙÀ½ÀÌ Á¦2¼Ò±¸Ä¡, Á¦1¼Ò±¸Ä¡, ÃøÀýÄ¡, Á¦2´ë±¸Ä¡, Á¦1´ë±¸Ä¡ ¼øÀ̾ú°í, ÁßÀýÄ¡°¡ °¡Àå »ó¹æ¿¡ À§Ä¡ÇÏ¿´´Ù.
The purposes of this study were to evaluate the timing of tooth calcification and the change of tooth position with tooth developmental stage on the mandibular teeth. Seven hundred seventy two children (male: 446, female:326), 3 to 12 years of age were examined radiographically with panoramic film. Dental development was determined by inspecting radiographs and assigning a rating according to consecutive stages defined by Moorrees, and tooth cusp position and root terminus position were measured from the lower border of mandibular body and calculated the position index to evaluate the movement of tooth with developmental stage.
The results were as follows.
1. There were no significant differences between boys and girls in the timing of calcification until crown completion, but timing of calcification tend to be faster in girls than in boys after root initiation stage.
2. In terms of mean age, crown completion of central incisor in boys and girls occurred at the age of 3.71, 4.05 years, at 4.44, 4.60 years for the lateral incisor, at 5.35, 5.11 years for the canine, at 6.62, 6.36 years for the first premolar, at 7.36, 7.17 years of second premolar, at 3.51, 3.69 years of first molar, and at 7.90, 7.64 years for the second molar respectively. Apex 1/2 closed stage of central incisor occurred at the age of 8.70 in boys, 8.18 in girls, at 9.55, 8.99 years for the lateral incisor, at 12.48, 11.60 years for the canine, at 12.30, 12_01 years for the first premolar, at 12.19, 12.26 years of second premolar, at 9.12, 8.87 years of first molar, and at 12.59, 12.45 years for the second molar respectively.
3. There was no noticeable movement of cusp tip until crown completion (Crc), but showed rapid movement toward occlusion plane after root initiation(Ri) and again maintain stable position after root completion stage (Rc) .
4. Root terminusposition was stable until root 1/4 formation stage(R1/4), followed by rapid movement towardocclusal plane and was stable again after root 3/4 formation stage(R3/4).
5. Developmental stage at the time of alveolar bone penetration by cusp tip varied with each of the permanent teeth.
6. Canine tooth follicle was at the lowest position in the mandibular body during the early stage of calcification, followed by second premolar, first premolar, lateral incisor, second molar, first molar and central incisor in order.

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ÇÏ¾Ç ¿µ±¸Ä¡¾ÆÀÇ ¹ßÀ°´Ü°è ½Ã±â;¸ÍÃâ;±³µÎÀü À§Ä¡Áö¼ö;Ä¡±Ù´Ü À§Ä¡Áö¼ö;Time of tooth developmental stage;Eruption;Tooth cusp position index;Root terminal position index

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