THE BIOLOGICAL SIGNIFICANCE OF NITRIC OXIDE IN THE DENTAL PULP AND PERIODONTIUM Ph.D. thesis Zsolt Lohinai DMD Supervisor: Péter Sándor MD, DMSc Professor of Physiology Program Director: Emil Monos MD, DMSc Professor of Physiology Semmelweis University Doctoral School PhD program: Physiological and pathological mechanisms of the cardiovascular system Institute of Human Physiology and Clinical Experimental Research