Tooth eruption

Dentition ( dentire from the Latin " teething " ) is the breakthrough of teeth from the jaw into the oral cavity. The teeth of humans and most mammals through two dentitions ( Diphyodontie ).

Physiology

The eruption of teeth is timed to coincide with the general body growth and the proportions of the jaw and facial skeleton. The teeth of the primary dentition need to complete development about 2 to 4 years, the teeth of the permanent dentition average of 12 years. Rooted teeth as the front and especially the canines are stored at the beginning of root formation very deep in the jaw bone, teeth multirooted are less deeply into the alveoli. The resorption (breakdown) of the roots begin in deciduous teeth almost immediately after completion of their roots. The actual resolution of the primary tooth roots is always ahead of the dissolution of the surrounding alveolar bone and the periodontal apparatus. The hard substances are broken down by osteoclasts and odontoclasts dissolved the tissue structures of the periodontal ligament fibroblasts and macrophages.

First ( lacteale ) dentition

The eruption of deciduous teeth (Latin: decidui dentes (from Latin: dens, tooth ', and decidere, fall ')) occurs in humans between the 6th and 30th month normally continuously from mesial (front) to distal (rear). The first milk tooth which passes at approximately one-half year old child, is generally a medium of lower incisor. This is followed by the upper central incisors, lateral incisors, canines that, the first molars and finally the second molars. Teething can be painful and sometimes associated with fever. After the passage of the deciduous incisors, the distal edentulous alveolar processes are still in contact. This contact goes with the passage of the first molars lost ( first physiological bite elevation ).

Main article to the first dentition: primary dentition

Second (permanent ) dentition (tooth replacement)

The eruption of permanent teeth (Latin: dentes permanent, (from Latin: dens, tooth ', and permanere remain ')) occurs in humans between 6 and 14 years also starting from the front. An exception are the wisdom teeth that break through until adulthood (or at the age of 16-30 years ), if they are ever created.

The first molars ( in dentistry as " 6- he ") is breaking mostly through before all other permanent teeth and because they break a rule even before the loss of the deciduous incisors (hence " 6 year molars "), and are they viewed by laymen often as late milk teeth. As such, they are in the dental care often neglected ( " falling out anyway " ) and can therefore often very early damage.

The table gives the average breakthrough times of permanent teeth again:

For tooth designation, see: odontogram

Overall, as in deciduous teeth in the permanent dentition, the lower the upper teeth usually " one step ahead". Noteworthy is the fact that in the upper jaw (but not in the lower jaw ) (4 -pack) to break through the first premolar in front of the canines. It's called the "jump around the corner". This allows the canine ( 3 ) of 1 premolar through the redemption ( " notch " ) to be performed on the mesial surface in the correct position. Deviations are also in the permanent teeth possible in terms of the penetration times, especially when baby teeth are lost prematurely.