Composition of human periodonal ligament cells in tissue culture

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Abstract
The cells in the PDL [peridontal ligament] of monkeys were demonstrated to have an unusual growth behavior in vitro, since fibroblast-like cells were reported to grow on top of epithelial-like cells. Growth of epithelial-like cells along with fibroblast-like cells was seen in human PDL from 3 of 15 permanent teeth when the explanation technique was used, whereas only fibroblast-like cells were seen after enzymatic degradation. Fibroblast-like cells were occasionally seen growing on top of epithelial-like cells.