Zheng M, Yang Y, Liu XQ, Liu MY, Zhang XF, Wang X, Li HP, Tan JG. Enhanced Biological Behavior of In Vitro Human Gingival Fibroblasts on Cold Plasma-Treated Zirconia. PLoS One. 2015 Oct 13;10(10):e0140278. doi: 10.1371/journal.pone.0140278. eCollection 2015. PubMed PMID: 26461253; PubMed Central PMCID: PMC4603669.