Morphological changes in gingival blood vessels during developing gingivitis in dogs

Blood vessels situated at the gingival margin were studied in dogs during a 16‐day period of developing gingivitis. Morphological changes in the vessels were assessed from photographs which had been taken periodically and were identical. Two characteristic alterations were found: increased width and changes in the course of the vessels. Increases in width were observed during the first week of the experiment. Changes in the course of vessels were found during the second week.