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PURPOSE: To compare the eytotoxicity of 5 different dental bonding agents to human periodontal ligament cells(HPDLCs). METHODS: Primary cultured HPDLCs were exposed to different concentrations (100%, 50% and 25%)of Super Bond, Clearfil SE Bond, G-Bond, Single Bond2, and Adper Easy One for different times (24 h, 48 h and 72 h). Cytotoxicity of 5 different agents to HPDLCs were observed by MTT method. The data was analyzed using SPSS 19.0 software package. RESULTS: Cytotoxicity of 5 dentin bonding agents to HPDLCs were Super Bond0.05). CONCLUSIONS: Cytotoxicity of 5 dentin bonding agents are different. Cytotoxicity of Super-bond C&B, G-Bond and Clearfil SE Bond are weak, while cytotoxicity of Single Bond2 is the strongest among the 5 agents. Supported by Medical Leading Talents and Innovation Team Project of Jiangsu Province (LJ201110) and Natural Science Foundation of Jiangsu Province (SBK201340904). [ABSTRACT FROM AUTHOR]