Sequelae in permanent dentition after traumatic dental injury in the primary dentition—A retrospective cohort study

Background: Luxation injuries to the predecessors can cause sequelae in the permanent successors. Aim: To describe and analyze sequelae in permanent successors according to the child's age at the time of different luxation traumas (concussion, subluxation, extrusion, lateral luxation, intrusion and avulsion) in the primary dentition compared with matched controls. 

Design: A retrospective analysis of 206 patients with 360 potentially damaged permanent teeth (PDPT) and 1057 permanent control teeth was performed. The PDPT was sorted into three age groups. The relative risk and level of significance (p = 0,05) of diffuse opacities, demarcated opacities, hypoplasia, and malformations were analyzed using Fischer's exact test and SPSS (version 29.0.1.0 (171), SPSS Inc. IBM Company). 

Results: Hypoplasia and malformations occurred more often in the 0-2-years group and were related to lateral luxation, intrusion, and avulsion injuries in the primary dentition. Demarcated and diffuse opacities occurred in all age groups and were related to subluxation, extrusion, lateral luxation, intrusion, and avulsion injuries. The risk was found to be more than seven times greater in trauma subgroups compared to controls. 

Conclusion: The younger the child is at the time of traumatic dental injury and the more extensive the luxation injury is, the greater the risk of developing a sequela.