Udovitskaia E V, Parpaleĭ E A
Stomatologiia (Mosk). 1989 May-Jun;68(3):63-5.
The composition of enamel from the first permanent lower molars was studied intravitally in 140 somatically asymptomatic children with intact teeth. The contents of Ca, P and molar Ca/P ratio were determined. At the age of 10, 13 and 14 years Ca levels were higher as related to 10, 13 and 14 for cuspid and to 13 and 14 years for paracervical specimen. After 10 years, cuspid Ca content was higher than cervical. At the age of 10 to 14 cuspid P content was reduced. Age-related increase in molar Ca/P ratio was also found. The values attained those characteristic of adult intact enamel at cuspid by the age of 9, and at cervix by 12 years. The data suggest that cuspid enamel matures earlier than pericervical one.
对140名牙齿完好的无症状儿童的第一恒下磨牙的牙釉质成分进行了活体研究。测定了钙、磷含量以及摩尔钙磷比。在10岁、13岁和14岁时，与尖牙的10岁、13岁和14岁以及颈周标本的13岁和14岁相比，钙水平更高。10岁以后，尖牙的钙含量高于颈部。在10至14岁时，尖牙的磷含量降低。还发现了与年龄相关的摩尔钙磷比增加。到9岁时，尖牙的这些值达到了成年完好牙釉质的特征值，到12岁时颈部达到该特征值。数据表明，尖牙牙釉质比颈周牙釉质成熟得更早。
