Infectious diseases are still the main cause of high morbidity and mortality in the world. The instrument must be kept sterile to reduce infection. Dental Nursing Department students in conducting field work practice in dealing with many patients with a very short change of time between patients. The number of patients is not proportional to the number of tools available, so the disinfection process on the equipment must be carried out. Common disinfection material used is alcohol 70%. Equipment that is usually disinfected with alcohol can cause corrosion in metal equipment; this is because of the chemical content in alcohol. Natural alternative ingredients that have the same ethanol content as alcohol is cinnamon. Objective: to analyse the effectiveness of cinnamon extract as a disinfectant in dental equipment. This research using a quasi-experimental design, this research design is a post-test with control group. Samples were divided into three groups, namely the smear group with 70% alcohol, the 5% cinnamon extract group, and the non-smear group. Then the number of bacterial colonies was calculated. Based on the research results obtained, disinfectant using cinnamon 5% had the lowest average number of bacterial colonies of 7.1CFU / cm2. This was because cinnamon was more concentrated, so ethanol was stickier for a long time compared to alcohol which quickly evaporated. Cinnamon had ethanol; ethanol and water are soluble content. Solubility of protein in water decreased, little by little the protein underwent denaturation, due to protein denaturationin bacteria could not work, then there was destruction of bacterial cells. Cinnamon has proven to be useful as a natural disinfectant, so it can be used as a reference as a safe alternative disinfectant.

Keywords : Cinnamon Extract, Alcohol 70%, Disinfectant.