Eruption of Permanent teeth
Permanent teeth which consist of 32 teeth completely erupt by the age of 18-25, the first in the sequence to erupt being the 1st Molar(6-7 yrs) and the last to erupt is the 3rd Molar(18-21 yrs).
The anterior teeth or the incisors mainly the mandibular erupt lingually to that of the deciduous, and the posteriors which are the Premolars erupt from below the deciduous molars which are the predecessors of the Permanent premolars.
The Permanent teeth dissolve the roots of the Deciduous teeth with the help of cells called osteoclasts which dissolve the dentin and the pulp of the root and as the Permanent teeth erupt push the Deciduous teeth out of the alveolar bone sockets.
The sequence of eruption of the permanent teeth is different in the mandible and the maxilla, the change seen due to the canine.
Maxilla: I Molar-Central incisor-Lateral Incisor-I,II Premolar-Canine-II Molar-III Molar.
Mandible: I Molar-Central Incisor-Lateral Incisor-Canine-I,II Premolar-Canine-II Molar-III Molar.
