The most common oral solitary pigmented lesion is the dental amalgam tattoo. It occurs as a result of colouring of the tissue by alien pigment which was administered intra or subepidermaly either intentionally or accidentally. The most common material used for the colouring of the oral mucosa is amalgam from amalgam fillings and metal particles from prosthetic restorations which are absorbed accidentally. The oral mucosa tattoos are most often found in the area of the marginal gingiva or the buccal mucosa. The metal particles may accidentally reach the area of the oral mucosa during various dentistry interventions. The therapy most often involves surgical intervention with excisional biopsy while in the recent period the low power laser therapy has provided exceptional results. The aim of the paper was to present the successful removal of the oral mucosa tattoo in a single visit.

Objective. Th e aim of this paper is to determine the concentration ofnitric oxide (NO) in the saliva of subjects resulting from the presenceof various metal restorative activities in the oral cavity. Patients andmethods. Th e research was conducted on 20 subjects (12 women and8 men), aged 18-30, with no metal fi llings in their oral cavity and 20subjects (11 women and 9 men) aged 18-30 with prosthetic and conservativework in their oral cavities made of various metals. Th e pHof the saliva was established by means of an “Orion” type pH meter atan optimal temperature of 250C. Th e concentration of NO was determinedby conversion of NO3-2 into NO2-2 with the help of elementaryzinc and then by colorimetric testing of the NO2-2 concentration bymeans of the Griess reagent. Results. Our results established that theconcentration of NO in patients with various metals (60.18±10.24) is33.7% higher, which is statistically insignifi cant, in relation to the controlgroup (45.01±6.28). Conclusion. Various metal restorative activitiesstemming from dentistry practice do not cause changes in the pHvalues of saliva and NO concentrations.