Fig. 5
From: Revisiting the vascularity of the keratinized gingiva in the maxillary esthetic zone
Correlation between the change in blood flow in the attached gingiva (ROI 8) and papilla (ROI 1 and 2). ROI 1 (blue points) is localized at the papilla tip; ROI 2 (orange points) is localized at the base of the papilla. The blue and orange dots are usually close together. Dashed lines indicate the linear regression between attached gingiva and, ROI 1 (blue) and ROI 2 (orange). A green circle indicates a subject with significant ischemia in the attached gingiva, but lack of significant ischemia in the papilla. The purple circle indicates papillary ischemia. Red circles indicate two subjects with extremely high ischemia in all three ROIs