Fattori prognostici dell’eruzione dell’incisivo permanente incluso

Abstract

Objectives

The aim of the present review was to identify factors influencing the eruption of impacted permanent incisors.

Materials and methods

Mitchell and Bennet evaluated the distance of the unerupted permanent tooth from the occlusal plane and classified it as: near (vertical displacement: crown of the impacted tooth is at the level of the coronal third of the root of the adjacent tooth; horizontal displacement: > half the width of the tooth itself); mid (vertical: the tooth is at the level of the middle third of the root of the adjacent tooth; horizontal displacement: > ½ but < 1 times the width of the tooth); far, greater displacement. Smailiene et al. analyzed the vertical position of impacted permanent incisors in relation to the contralateral erupted central incisor. They defined three positions: v1, the crown is at the level of the gingival third of the root of the adjacent permanent incisor; v2, the crown is at the level of middle third of the root; v3, the crown is at the level of apical third of the root. Bryan et al. estimated inclination of the unerupted tooth calculated as the angle between its long axis and the mid-sagittal plane.

Results and conclusions

These methods are easy to perform and effective for predicting the spontaneous eruption of malposed incisors. The vertical position of the tooth and the angle between its long axis and the mid-sagittal plane appear to be important factors for predicting eruption.