This classification is similar to that adopted by the study made at the King Saud School of Dental Medicine in Riyadh, which classified the Tubes into 3 categories without specifying the measures: "1": Smooth surface or lack of structure, "2": Depression or groove and "3": prominent cusp [7]. This extra cusp is usually found on the first molar, and becomes progressively less likely in the second, third molars. The grades are exemplified in Figure 2. Mavrodisz, K. Nature,
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