Age-related changes of pull-dentin complex of human premolar

To provide morphological basis for dental aging and senile teeth diseases and to study age-related changes of pulp-dentin complex of human premolar.Human premolars of different groups according to ages were decalcified,embedded in parafin and cut into slices.The slices were dyed by haema toxilin-erosin and were observed with microscopy.Then all slices were studied quantitatively by image analysis.Results:in dental pulp-dentin complex with aging,the pulp volumethe number of cells and blood vessels decreased;the fibers increased;calcium salts deposited and some of detinal tubules disappeared;the volume density of the pulp decreased and volume density of extracellular matrix increased.The changes between groups had significant difference.Conclusion:In dental pulp-dentin complex,the cell components decrease and the fibers components increase by aging.