ORAL MEDICINE : Failure of eruption of first and second permanent molars

Eruption is a process of biological maturation, which comprises the axial movement of a tooth from the developmental position within the jaw towards the functional position in the occlusal plane.

The eruption of the first and second permanent molars is especially important for the co-ordination of facial growth, and for providing sufficient occlusal support for undisturbed mastication.

Eruption is a multifactorial process, whose biological mechanism remains unknown. 


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Among the various hypotheses that have been proposed, the root growth and periodontal ligament theories are largely disregarded today, because eruption also occurs in the absence of root formation and PDL. 

In more recent studies the dental follicle theory has gained popularity. 

This organ is considered an essential requisite for bone resorption in the eruption path as well as for the formation of bone below the roots. 

There is a close relationship between the moment of eruption of a tooth and its stage of root development. 

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