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Assessment of gingival fibroblast Cytotoxicity of Recasted cobalt chromium dental alloy- In vitro study

Author: 
Dr. Supriya Shetey, Dr. Sounyala Rayannavar, Dr. Abhijit P. Patil and Dr. Sayed Killedar
Subject Area: 
Health Sciences
Abstract: 

Statement of problem: Recasting procedure could affect the cytotoxicity of dental alloys because remaining alloy from initial castings is reused commonly with addition of new alloy. Purpose: To evaluate the effect of recasting of cobalt chromium alloys on gingival fibroblast cytotoxicity. Materials and Methods: Disk-shaped specimens (1 × 2 mm, n=40) of cobalt chromium alloys were prepared with 100% new alloy and 50%, 30%, and 15% once recast alloy. 10 specimens from each group were conditioned in 0.5ml of saline (0.9% NaCl) containing 3% bovine serum albumin(BSA). Cytotoxic effects were assessed on human gingival fibroblast with (MTT) colorimetric assay a 3-(4.5-dimethylthiazol-2-yl)-2.5-diphenyl tetrazolium bromide and neutral red uptake (NRU) assay test. Collected data was statistically analysed with one way ANOVA and Tukey’s HSD multiple comparison test for each group and the effect of repeated casting of base metal alloys on gingival fibroblast cytotoxicity was evaluated. Results: Effects of alloy type on MTT activity and NRU assay depend on the amount of recasted alloy addition (P<.001) indicating amount of recast alloy affected the cellular activity of HGF by 1-way ANOVA. Post hoc multiple comparison tests were performed to determine how casting procedures affect MTT activity NRU assay of HGF cells. Tukey’s HSD test revealed that the mean MTT activity and NRU assay was significantly different for each casting procedure group (P<.001). Post hoc comparisons of the 4 casting procedures also indicated that each increase in surplus alloy amount in the alloy. Conclusions: Recasting of cobalt chromium alloys increased cytotoxicity and decreased cell viability of human gingival fibroblasts.

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