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Chinese Journal of Dental Research
Chin J Dent Res 23 (2020), No. 2     16. June 2020
Chin J Dent Res 23 (2020), No. 2  (16.06.2020)

Page 143-150, doi:10.3290/j.cjdr.a44750, PubMed:32548605

Regeneration of Dental Pulp Tissue by Autologous Grafting Stem Cells Derived from Inflammatory Dental Pulp Tissue in Immature Premolars in a Beagle Dog
Ling, Long / Zhao, Yu Ming / Wang, Xiao Tong / Wen, Quan / Ge, Li Hong
Objective: To compare the biological characteristics of dental pulp stem cells (DPSCs) and inflamed dental pulp derived stem cells (I-DPSCs) in vitro and their regeneration potential in Beagle immature premolars.
Methods: Pulpitis was induced in the premolars of one beagle dog by opening the pulp chamber for 2 weeks, and inflammation was histologically confirmed. DPSCs and I-DPSCs were isolated from normal and inflamed dental pulp, and cell morphology, expression of mesenchymal stem cell markers, clone formation ability, cell proliferation and osteogenic/odontogenic differentiation potential were compared. The dental pulp of 20 roots from 10 immature premolars was extracted and divided into two groups. DPSCs or I-DPSCs with scaffolds were transplanted into the root canals. The roots were extracted after 3 months, and pulp regeneration was evaluated by histological analysis. The data were statistically analysed using one-way ANOVA and a Student t test.
Results: Histological analyses showed lymphocyte infiltration and elevated TNF-α expression, which confirmed the diagnosis of pulpitis. I-DPSCs showed similar morphology, marker gene expression and clone formation ability but greater proliferation ability and osteogenic/odontogenic differentiation potential. Pulp-like tissue formation and bone- and dentine-like tissue deposition were observed in both DPSC- and I-DPSC–transplanted roots.
Conclusion: DPSCs derived from inflammatory dental pulp tissue have similar biological characteristics to those from normal dental pulp and could mediate pulp and dentine regeneration in immature premolars.

Keywords: dental pulp stem cells, inflamed dental pulp, tissue regeneration