Abstract
Tooth impaction is defined as any tooth that fails to erupt into a normal functional position and remains unerupted beyond the time at which it should normally erupt. Reports of impaction and eruption failure in primary teeth are relatively rare compared to permanent teeth. We report 2 rare cases where the second premolar was located on the occlusal side of the impacted mandibular second primary molar. In the first case, the succedaneous permanent tooth erupted after extraction of the primary tooth, fenestration, and traction. In the second case, the succedaneous permanent tooth erupted without fenestration or traction. Although the etiology of the tooth displacement was unknown in both cases, inhibition of the eruptive movement of the primary molar may have been associated with displacement of the succedaneous permanent premolar.
Highlights
Tooth impaction is defined as any tooth that fails to erupt into a normal functional position and remains unerupted in the jaw beyond the time when it should normally erupt [1]
We report 2 rare cases of severe impaction of the mandibular second primary molar where the succedaneous second premolar was located over the impacted second primary molar
It is important that pediatric dentists detect the impaction of primary molars during primary dentition to prevent disturbing the complete and sound eruption of permanent dentition and avoid treatment complications
Summary
Tooth impaction is defined as any tooth that fails to erupt into a normal functional position and remains unerupted in the jaw beyond the time when it should normally erupt [1]. Reports of impaction and eruption failure in primary teeth are relatively rare compared to permanent teeth [1, 2]. Among primary tooth impaction cases, second primary molars are most frequently affected, followed by primary central incisors [2, 3]. Since impaction of a primary tooth with displacement of the succedaneous permanent tooth might disturb the growth of the permanent dental arch, detection and treatment of impacted primary teeth are essential. We report 2 rare cases of severe impaction of the mandibular second primary molar where the succedaneous second premolar was located over the impacted second primary molar
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