Objectives: The aim of the study was to compare Ra (roughness analysis) and Sa (section analysis) of an experimental silver amalgam Dentinmet (IMN) prior and after Nd:YAG laser application. Methods: 40 undamaged premolar human teeth were randomly assigned to 2 equal groups filled with Dentinmet. The Nd:YAG laser beam was applied to the amalgam surface (power range 1W, 5W, 9W) – 10 filled teeth per one range; the control group of 10 filled premolars without radiation. Research through the AFM method was carried out with the E Nanoscope (Digital Instruments). The results obtained were expressed as an average of 10 measurements and corresponding standard deviations. Results: Authors obtained an effect of increase of smoothness of amalgam exposed to 9W laser beam (amalgam Ra: control - 42,05 ± 3,39, SD 4,74; 9W - 41,82 ± 6,66, SD 9,31; amalgam Sa: control - 302,69 ± 53,34, SD 74,57; 9W - 370,13 64,22, SD 89,77). Conclusions: The AFM technique seems to be a very useful method enabling high precision three-dimensional analysis exact and visualization. Results obtained might suggest the efficiency of Nd;YAG expositions in the following categories of clinical use: correction of micro-defects of filling material surfaces, micro-correction of occlusion-articulation interdependences in cases of trauma locus.

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