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ÀÒÇп˜¹µ¡¡ÃÐ ¤×Í ÀÒÇзÕ还¹ÁÕ permanent hypomineralization áÅÐÁÕà¹×éÍ¿˜¹
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¡ÒÃÊÌҧà¹×éÍ¿˜¹ã¹ÃÐÂС‹Í¹¿˜¹¢Ö鹨ÐÁÕÃÐÂÐ enamel maturation «Ö觨ÐÁÕ¡ÒÃÊÐÊÁáË

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ÁÒ¡à¡Ô¹ä»ã¹ÃÐÂйÕé¨Ðú¡Ç¹¡ÒÃÊÐÊÁáË¸ÒµØ áÅÐ matrix protein Âѧ¤§ÍÂÙ‹ äÁ‹ÊÅÒÂä»
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µÒÃÒ§·è 4 ¡ÒÃÊÓÃǨ¤ÇÒÁªØ¡¢Í§¤ÇÒÁ¼Ô´»¡µÔ¢Í§ªÑé¹¼ÔÇà¤Å×ͺ¿˜¹ª‹Ç§¡‹Í¹»‚ 1977
Crown formation
Permanent tooth Calcification begin at
completed

Central incisor 3-4 months 4-5 years

Lateral incisor 10-12 month (Maxilla); 3-4 months (Mandible) 4-5 years

Canine 4-5 months 6-7 years

First premolar 18-24 months 5-6 years

Second premolar 24-30 months 6-7 years

First molar Birth 30-36 months

Second molar 30-36 months 7-8 years

Third molar 7-9 years (Maxilla); 8-10 years (Mandible)

77