[Effect of iRoot BP Plus on biological behavior of deciduous tooth pulp stem cells and human pulp stem cells]

To evaluate the effect of iRoot BP Plus as pulp-capping agents on the biological behaviors of stem cells from human exfoliated deciduous teeth (SHED) and human dental pulp stem cells (DPSC).

iRoot BP Plus and ProRoot MTA sample disks were prepared and the extractive solution was extracted from iRoot BP Plus and ProRoot MTA sample disks. The influence of iRoot BP Plus and MTA extracts on the SHED and DPSC proliferation capacity was detected by CCK-8 method at 1, 3, 5 and 7 days.The influence of iRoot BP Plus and MTA extract on the SHED and DPSC migration capacity was observed by Transwell chamber and scratch repair experiments. SHED and DPSC were respectively inoculated on the sample disks of iRoot BP Plus and MTA for culture. Phalloidin and DAPI (4',6-diamidino-2-phenylindole) were used for immunofluorescence staining on 1, 3 and 5 days respectively to observe cytoskeleton changes. SHED and DPSC underwent mineralization induction respectively in osteoblastic induction medium, the osteoblastic induction medium containing MTA extract and the osteoblastic induction medium containing iRoot BP Plus extract. Alkaline phosphatase (ALP) staining and quantitative analysis of ALP were performed at 7 and 14 days, Alizarin Red staining and semi-quantitative analysis of calcium salt deposition were performed at 21 days. SPSS 19.0 software package was used for statistical analysis of the data.

iRoot BP Plus and MTA extracts could promote cell proliferation of SHED and DPSC. In cell migration and adhesion experiments, iRoot BP Plus and MTA both promoted migration and adhesion of SHED and DPSC, and iRoot BP Plus played a more significant role (P=0.000). After mineralization induction, the ALP activity of SHED and DPSC in iRoot BP Plus group was significantly greater than that of MTA. Alizarin red staining and semi-quantitative analysis of calcium salt deposition showed that both iRoot BP Plus and MTA could promote cell mineralization. Moreover, the ability of iRoot BP Plus to promote cell mineralization was significantly stronger than that of MTA (P=0.000).

iRoot BP Plus and MTA has good biocompatibility and good osteogenetic differentiation ability, it can promote SHED and DPSC cell proliferation, adhesion, migration, and BP Plus has better affect of promoting iRoot SHED and DPSC adhesion, migration and distribution of differentiation than MTA, therefore iRoot BP Plus and MTA may be used as pulp capping agent both for deciduous and permanent teeth.