Fig. 1From: Zonal analysis in contemporary aesthetic orthognathic surgical planningFacial zones used in zonal analysis. Zone I is the nasomaxillary zone (shown in the centre in purple), and its extended zones are the cheeks (shown as the bilateral triangles in purple). Zone II is the mandibular zone (shown in the centre in green), with extended zones bilaterally. Zone III is the malar zoneBack to article page