<![CDATA[ Background: Pulp capping is a treatment that aims to maintain the viability of the pulp tissue. Calcium hydroxide (Ca(OH)2 is a material that is often used for pulp capping procedures. However, this material does not provide a good adaptation to dentin. Therefore, an alternative material that is more biocompatible is needed, one of which is by using papuyu fish scale chitosan. papuyu fish as an alternative material must be proven to have no toxic effects. Purpose: to analyze whether the chitosan of papuyu fish scales (Anabas testudineus) is toxic to BHK-21 fibroblast cells using the MTT assay method. Methods: This study was a pure experimental study with a post-test-only design with a control group design consisting of 12 groups. The group given the chitosan treatment of papuyu fish scales consisted of 10 groups with concentrations of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% with 2 control groups namely control cells. and media control. Results: The results showed that the chitosan of papuyu fish scales did not have a toxic effect on BHK-21 fibroblast cells because the percentage value of cell viability of the entire treatment group was > 60% and the IC50 value was > 0.1%, which was 5.405 %. Conclusion: There was no toxic effect after administration of papuyu fish scales chitosan (Anabas testudineus) with concentrations of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% on cells BHK-21 fibroblasts. Keywords: BHK-21 fibroblast cells, Papuyu fish scale chitosan, Toxicity test]]>
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