Anatomical and Histological Characteristics of Prematurely Erupted Teeth in Newborns.

Purpose: To assess the characteristics of dental hard and soft tissue structures of prematurely erupted teeth in newborns. Methods: Extracted natal and neonatal teeth were assessed in ground sections for evaluation of enamel, dentin, dentino-enamel junction and cementoenamel junction. Soft tissue harvested was histologically analyzed for cellularity, vascularity and other characteristics of the dental pulp. Results: This study included 15 teeth from nine neonates, of which seven erupted at birth, eight erupted within the first month of birth. All erupted in the mandibular anterior region. The demineralized ground section revealed enamel cracks, a straight dentinoenamel junction, and S-shaped dentinal tubules along with the enamel lamellae, and enamel spindle. None of the samples showed enamel tuft or cementum. Histology of soft tissue revealed enhanced cellularity, vascularity without any fibrosis, calcification and inflammation when compared with the young healthy pulp in permanent teeth. Conclusion: The prematurely erupted teeth in newborns were almost exclusively rootless and exhibited the characteristic anatomical findings pertaining to enamel, dentin, dentinoenamel junction and cementoenamel junction. The histology of their dental pulp was characterized by increased cellularity and vascularity compared.