In vitro cytotoxicity of a low-shrinkage polymerizable liquid crystal resin monomer

Edward J. Boland, David L. Carnes, Mary MacDougall, Neera Satsangi, Ralph Rawls, Barry Norling

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The objective of this study was to determine the in vitro cytotoxicity of novel, polymerizable liquid crystal resin monomers when placed in direct contact with dental and nondental cell lines. One common dimethacrylate and three liquid crystal compounds, Bisglycidyl methacrylate (Bis-GMA), 2-(t-butyl)-1,4-bis-{4-(6-acryloxy-hexane-1-oxy)-benzoyloxy}-benzene (C6), 2-(t-butyl), 1-[6-(3-acryloxy-propionoxy)-hexane-1-oxy-benzoyloxy], 4-[4-(6-acryloxy-hexane-1-oxy)-benzoyloxy]-benxene (by-product), and a 3:2 mixture of C6 and by-product, respectively, were tested for relative cytotoxicity in vitro. Cultured dental and nondental cells were treated for 24 h with test compound dissolved in media over a fourfold range of concentration (10-4 -10-7 mol/L). Cytotoxicity was measured using the WST-1 reagent as an indicator of remaining cell numbers based on the reduction of WST-1 substrate by mitochondrial dehydrogenases in viable cells. Bis-GMA ID50 was found to be consistent with ID50 values reported in the literature. A small but significant difference in the sensitivity of the dental and nondental cells in regard to their response to this dimethacrylate was noted. The liquid crystal resin monomers were significantly less cytotoxic to all cell lines tested. ID50 values of >1 × 10 -4 mol/L were registered for the C6 and by-product monomers alone. The 3:2 mixture of C6 and by-product had a slightly higher cytotoxicity (ID 50 = 1 × 10-4 mol/L); however, this remained significantly less than that of Bis-GMA. The results demonstrate that the newly synthesized low-shrinkage, polymerizable liquid crystal resin monomers demonstrate a minimal cytotoxic effect on both dental and nondental cells. These data suggest that the low-shrinkage liquid crystal resin monomers will not elicit a response by oral tissues (pulp tissue) when used to repair carious lesions in posterior teeth.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume79
Issue number1
DOIs
StatePublished - Oct 2006

Keywords

  • Cell survival assay
  • Dental cell lines
  • Dental materials
  • In vitro cytotoxicity
  • Liquid crystal resin
  • Polymerizable monomers

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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