A transmission electron microscope study of fibroblast changes in human deciduous tooth pulp

Area of Science:

• Dental Biology
• Cell Biology
• Histology

Background:

• Primary teeth undergo physiological root resorption.
• Pulp fibroblasts play a crucial role in maintaining pulp tissue health.
• Understanding cellular changes during root resorption is vital for pediatric dentistry.

Purpose of the Study:

• To investigate the ultrastructural changes in pulp fibroblasts during root resorption in primary teeth.
• To compare fibroblasts in primary teeth with and without root resorption.
• To evaluate the potential of primary teeth as a model for studying fibroblast aging.

Main Methods:

• Electron microscopy was used to examine coronal pulp tissues from primary canines.
• Teeth were categorized based on the presence or absence of root resorption.
• Fibroblast morphology, cytoplasmic features, cytoskeleton, and cell-fibril interactions were analyzed.

Main Results:

• Mature fibroblasts, similar to those in permanent teeth, were observed in non-resorbed primary teeth.
• Fibroblasts in resorbing primary teeth exhibited signs of regression, including cytoplasmic alterations and cytoskeletal changes.
• Dissociation of cells and fibrils was noted in fibroblasts from teeth with advanced root resorption.

Conclusions:

• Pulp fibroblast regression occurs during root resorption in primary teeth.
• Deciduous teeth provide a relevant biological model for investigating the aging process of pulp fibroblasts.
• These findings contribute to the understanding of cellular dynamics in dental tissues during development and resorption.