# Maxillary Central Incisor Eruption Failure Due to Supernumerary Teeth and Pericoronal Hamartoma: A Report of a Rare Case

## TL;DR

A rare case of a child's tooth being blocked from erupting due to an extra tooth and a benign lesion, which was successfully treated by removing both.

## Contribution

This case report highlights the rare regeneration of alveolar bone after removing a supernumerary tooth and a pericoronal lesion.

## Key findings

- An eight-year-old girl had an unerupted maxillary central incisor blocked by a supernumerary tooth and PMH.
- After removing the supernumerary tooth and PMH, the impacted tooth erupted and alveolar bone regenerated.
- This case demonstrates that alveolar bone can regenerate following lesion removal in impacted tooth cases.

## Abstract

Impaction of permanent teeth during the replacement period is a relatively common occurrence in clinical practice. Tooth impaction occurs in the presence of factors that inhibit tooth eruption, such as supernumerary teeth or tumors. This is a report of permanent tooth impaction due to supernumerary teeth and pericoronal myxofibrous hyperplasia (PMH), a type of pericoronal hamartomatous lesion. An eight-year-old girl was diagnosed with an unerupted right maxillary central incisor. An inverted supernumerary tooth was present on the palatal side of the impacted central incisor, and PMH developed on the labial side of the central incisor. Interestingly, the alveolar bone on the labial side had completely disappeared. After the extraction of the supernumerary tooth and the removal of the PMH, the central incisors erupted, and the labial alveolar bone regenerated normally. Treatment for impacted teeth typically involves the removal of any existing lesions. This case is unique in that the alveolar bone of the impacted tooth regenerated following the extraction of the supernumerary tooth and removal of the PMH.