The Effect Of Cervical/Dentine Sealant On Rat Pulp-Vessels B. Kispélyi, I.Iványi *, L. Rosivall**, I. Nyárasdy* (Semmelweis Medical University, Department Of Prosthodontics, *Department Of Conservative Dentistry, **Department Of Pathophysiology) Exposed cervical surfaces caused by gingival and alveolar bone retraction or/and by cervical abrasion results in sensitivity of the tooth. A new product, the dentine sealant (Seal & Protect, DeTrey Dentsply) is able to reduce hypersensitivity and cervical abrasion.   There is no available data on the vascular effects of this sealant material. In the present study we examined, whether the "lege artis" application of Seal & Protect (test) alters the blood circulation of the pulp of the rat lower incisor.   The application of saline served as control. The technique of vital microscopy was used on the first lower incisor of twenty ( 10-10 in each group ) male Sprague - Dawley rats ( weighing 320,4 ± 12,4 /SE/ g) to record the changes in vessel diameter prior to and 5, 15, 30 and 60 minutes after the administration of the investigated materials to the dentin.   Results: There was no significant difference between control and test groups (5th min: 1.6 ± 5.05/SE/; 15th min: 2.07 ± 5.33/SE/; 30th min: 9.0 + 5.0/SE/; 60th min: 4.67 ± 4.43/SE/ p=0,37). A possible tendency of vasodilatation could be observed, however the difference was not significant .   Conclusion: These results suggest that under our experimental conditions the investigated dentine sealant has no vasoconstrictor / vasodilator effect on the pulpal circulation.