Journal of Conservative Dentistry
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ORIGINAL ARTICLE
Year : 2020  |  Volume : 23  |  Issue : 4  |  Page : 412-416

The effects of recasting on the cytotoxicity of dental base metal casting alloys


1 Department of Dental Materials, Yenepoya Dental College, Yenepoya (Deemed to be University, Mangalore, Karnataka, India
2 Department of Dental Materials, Biomaterials and Research Centre, Yenepoya Dental College, Yenepoya (Deemed to be University, Mangalore, Karnataka, India
3 Conservative Dentistry and Endodontics and 5Oral Pathology, Forensic Odontology, Yenepoya Dental College, Yenepoya (Deemed to be University, Mangalore, Karnataka, India
4 Department of Dental Materials, Manipal College of Dental Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
5 Department of Pharmaceutical Biotechnology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
6 Oral Pathology, Forensic Odontology, Yenepoya Dental College, Yenepoya (Deemed to be University, Mangalore, Karnataka, India

Correspondence Address:
Dr. B T Nandish
Department of Dental Materials, Yenepoya Dental College, Yenepoya (Deemed to be University), Deralakatte, Mangalore - 575 018, Karnataka
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JCD.JCD_260_20

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Aim and Objectives: In dentistry, base metal casting alloys are extensively used for the fabrication of inlays, onlays, crowns, bridges, partial dentures, etc. During the casting of these alloys, excess amount of material used than needed will be collected as sprue buttons at the end, which is either added to the fresh alloy during casting and reused or disposed of. Materials and Methods: The aim of the present in vitro experimental study was to investigate the effect of the complete recasting of four commercially available cobalt-chromium (Co-Cr) and nickel-chromium (Ni-Cr) base metal casting alloys on their cytotoxicity. During the study, four groups of alloys were subjected to complete recasting up to twenty times without the addition of new alloy. The cytotoxicity assessment of the selected alloys after recasting (Co-Cr and Ni-Cr alloys) was carried out using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Results: The results indicated that Co-Cr alloys exhibit superior cell viability compared to Ni-Cr alloys, and cytotoxic potential of the alloys increased with repeated casting and led to increased cell death. The recasting of alloys in the present study did not show high cytotoxicity even after the 20th recasting. Conclusion: From the results of the present study, it can be concluded that the alloys generated as a waste in the dental laboratory can be safely reused up to five times or at least once before they can be disposed, which reduces the cost of the treatment and also helps in conserving the natural resources.


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