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. 2023 Feb 13;27(4):1541–1546. doi: 10.1007/s00784-022-04774-6

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Fig. 2 — A A peri-apical X-ray lower molar. B The visual evaluation method. The osculating circle, the trasversal width and the longitudinal length are drawn on the rx. C Diameter of the osculating circle (D, in red); trasversal width (T, in light blue); longitudinal length (L, in yellow)