Background: Alginate impression contaminated by saliva and blood could potentially cause cross contamination. To prevent this, the impression has to be disinfected by disinfectant liquid, such as mimba oil. Mimba oil (Azadirachta indica A.Juss) has some chemical content, such as azadirachtin, which is a phenol group used as antibacterial and antimalaria, nimbolide used as antibacterial and anti…