Media type: E-Article Title: Comparison of MTT assay, flow cytometry, and RT‐PCR in the evaluation of cytotoxicity of five prosthodontic materials Contributor: Wang, Xue; Xia, Yang; Liu, Laikui; Liu, Mei; Gu, Ning; Guang, Hanbing; Zhang, Feimin Published: Wiley, 2010 Published in: Journal of Biomedical Materials Research Part B: Applied Biomaterials, 95B (2010) 2, Seite 357-364 Language: English DOI: 10.1002/jbm.b.31723 ISSN: 1552-4973; 1552-4981 Origination: Footnote: Description: <jats:title>Abstract</jats:title><jats:p>In the present study, the cytotoxic effects of five prosthodontic materials on the L929 cell line were assessed by flow cytometry (FCM), reverse transcription PCR (RT‐PCR), and MTT (3‐(4,5‐dimethylthiazole‐2‐yl)‐2,5‐diphenyltetrazoli‐umbromide) assay. The cells were treated with eluates resin (RE), pressable ceramics (PC), Co‐Cr alloy‐porcelain (CC), Ni‐Cr alloy‐porcelain (NC), and diatomite ceramics (DC). The cytotoxicity of all the materials tested by the MTT assay was grade 1. By FCM analysis, apoptosis rates of DC and PC were low, with no significant difference from the control (<jats:italic>p</jats:italic> > 0.05). The rest of the groups induced much higher apoptosis rates (<jats:italic>p</jats:italic> < 0.05), with the highest in the RE group. The necrotic cell levels of RE was also significantly increased (<jats:italic>p</jats:italic> < 0.05). <jats:italic>Bcl‐2</jats:italic> and <jats:italic>Bax</jats:italic> mRNA expression were determined by RT‐PCR, and the <jats:italic>Bax/Bcl‐2</jats:italic> ratio in the DC and PC groups were not significantly different from the control (<jats:italic>p</jats:italic> > 0.05), whereas CC, NC, and RE groups showed significant differences (<jats:italic>p</jats:italic> < 0.05). Taken together, the results suggest that FCM and RT‐PCR analyses can supplement the traditional MTT assay in evaluating the cytotoxicity of prosthodontic materials for selecting highly biocompatible materials. © 2010 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2010.</jats:p>