Figure 56. triangle sigmoid rough Ramsey et al. 1976. 56.1.1 to 56.1.4. Profile/lingual, lingual, profile, and labial views showing tooth occlusal crest, sigmoidal curvature, and labial face ridges/lines. 56.1.5. Showing a parallel-sided inline and apical striations (transmitted light image), scale bar = 2.0 mm. GSC 124624.