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. 2015 Jul 16;5:12150. doi: 10.1038/srep12150

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(A) SEM images with morphological and directionality striation features (the numbers indicate the sequence of the gestures). (B) Stereo microscopical image of Villabruna RM₃ with magnification of the cavity and of the region (ellipse) containing the striations described in this figure (region 2 and 4 in Fig. 3). (C) Example of 3D rendering and cross-section of the striation observed in the Villabruna tooth cavity (area 2 in Fig. 3). B, buccal; L, lingual; M, mesial.