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چکیده
The nomenclature used here (see also Fig. S1) was built on classical dental serial homologies. The work of Hershkovitz [2] was a major source for defining homologous structures and naming them, but other sources were also considered [3-7]. These works emphasized dental structures that are expressed as relief on tooth crowns. Structures expressed as depressions, in particular groove systems, were also demonstrated to be important features of tooth morphology (see notably Hünermann’s and Orliac’s works on suoids [8-10]). Grooves are often more resistant to wear than salient structures, and the presence of grooves is not dependent on that of crests (and vice versa). Therefore, both systems (reliefand depression-based) are viewed here as fully complementary and were integrated in the proposed nomenclature. On this ground, two steps were necessary to establish a congruent terminology: 1) naming and defining the common structures appearing on all tooth crowns; 2) naming and defining particular cusps/-ids and their elements. Tooth orientation terminology used in this work (Fig. S1) follows recommendations formulated by Smith & Dodson [11].
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