title: Biocompatibility of various root canal filling materials ex vivo.
abstract: OBJECTIVE
  To evaluate the biocompatibility of a resin-based endodontic filler (RealSeal) using the indirect cytotoxicity test.
  
  
  METHODS
  Human gingival fibroblasts were cultured ex vivo. Pellets of the materials to be tested were incubated for 24, 48, and 72 h at 37 degrees C under sterile conditions to obtain their eluates. The fibroblasts were exposed to either diluted (50%) or undiluted eluates for 24 h. A culture medium with foetal calf serum was added to the control wells. Cell viability was estimated by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide method. The data concerning cell viability were statistically analyzed using one-way anova test and Bonferroni multiple comparisons test.
  
  
  RESULTS
  Eluates obtained after 24 h of incubation with the resin filler did not reduce cellular viability. An increase in cellular viability, as compared with control cells, was observed in the gutta-percha group. The undiluted eluate from the polyether material was cytotoxic, causing an 82 +/- 4% decrease in cellular viability. Eluates obtained after 48 h of incubation with the resin filler increased cellular viability, whereas the polyether significantly reduced viability. Gutta-percha did not cause any detectable change. After 72 h of incubation the eluate of the resin filler caused an increase in cellular viability, as did gutta-percha, whereas polyether caused a significant decrease.
  
  
  CONCLUSIONS
  RealSeal resin filler was nontoxic in this laboratory model. Further investigations are necessary to verify its usefulness in clinical applications.
authors.affiliation: Department of Dental Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Scotti
authors.forename: R
authors.initials: R
authors.lastname: Tiozzo
authors.forename: C
authors.initials: C
authors.lastname: Parisi
authors.forename: M A
authors.initials: MA
authors.lastname: Croce
authors.forename: P
authors.initials: P
authors.lastname: Baldissara
mesh_terms: D002470:Cell Survival / Q000187:drug effects*; D002478:Cells, Cultured; D003188:Composite Resins / Q000009:adverse effects*; D005347:Fibroblasts / Q000187:drug effects; D005881:Gingiva / Q000166:cytology / Q000187:drug effects*; D006171:Gutta-Percha / Q000009:adverse effects; D006801:Humans; D012387:Root Canal Filling Materials / Q000009:adverse effects*
chemical_list: D003188:Composite Resins; C511498:Real Seal composite resin; D012387:Root Canal Filling Materials; C532618:permadyne penta L; D006171:Gutta-Percha