Agenesia of proximal teeth sometimes gives rise to tooth impaction as a result of loss of the
eruption guidance function. In particular, this can affect the upper lateral incisors. And,
lastly, the poorly-documented phenomenon of ankylosis occurs following the more or less
total disappearance of the dental ligament associated with hypercementosis and root
resorption which obstruct all physiological or provoked dental development at various
stages