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Figure 1: Ricketts' analysis illustrating landmarks and planes in the measurement of the VERT index: Xi point and Dc, S-N plane (black dotted line), Frankfort plane (Po-Or) – black solid line, Ptm-Gn plane (blue line), Ba-N plane (red line), Mandibular plane (Go-Me) - green line. a - FMA, b - FMIA, c - IMPA, d - Facial axis angle, e - SNA, f - SNB, g - SN.Go-Gn |
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