Teeth – development and teething
The development of teeth. This essay is how to write slowly. This is a complicated and lengthy process that begins in the embryonic period and ends at the age of 18 – 20 years. In the development of both temporary and permanent teeth distinguish 3 periods: the tab and the formation of tooth primordia, their differentiation, histogenesis of dental hard tissues.
Bookmark and teeth formation begins at 6 – 8 weeks of fetal development and is characterized by the formation of the epithelial plate first, and then the enamel caps. Differentiation of dental germs, occurring in 12 – 14 th week of embryogenesis, characterized by the formation ameloblast – builders enamel and odontoblasts – builders dentin. Histogenesis of dental hard tissues from the end of the 4th month of embryogenesis. In the process of histogenesis of dentine formed at first and then the enamel. Tissue calcification begins at the end of the 5th month of fetal development.
Development of permanent teeth is the same as temporary. Bookmark begins with the 5th month of fetal development. Initially laid incisors, canines and premolars. The rudiment of the first molar is laid around the 6th month of life, and the third – to 4 – 5-year life. It should be noted that the root development of both temporary and permanent teeth begin shortly before the eruption of the tooth and the formation of root-ends 2 years after the eruption.
These data on the timing tab and the development of dental tissues is important for understanding and explaining the changes (pathology of dental hard tissues, edentia, etc.) observed in clinical practice. For clinical practice is also important to know the timing of root formation of temporary and permanent tooth root resorption and the timing of temporary teeth. These data determine the choice of treatment, indications for their removal, etc.
Teething. Regulated by the nervous and endocrine systems. This process affects the differentiation of dental tissues, accompanied by an increase in the volume and capacity within the rudiment of a certain pressure (voltage).
Of great importance is the restructuring of bone tissue in front of and behind the bud, that if there is tension within the rudiment makes his move. Terms of eruption of permanent teeth are presented in Table.
