Clinical Comparison Of Two Different Fissure Sealant Materials Grit Sehrer*, Christian Hirsch, Hans-Guenter Schaller (Dept. Of Operative Dentistry, Periodontology, And Pediatric Dentistry, University School Of Dental Medicine, Martin-Luther-University Halle-Wittenberg, Halle, Germany) Recently, new compomere based fissure sealant materials have been introduced in dentistry. The objective of the study was to compare properties of a new compomere based sealant material (Dyract Seal, DeTrey, Dreieich, Germany: fluorosilicate glass, aminopenta and macromonomer M-1A-BSA) to a common clinically used composite based sealant material (Helioseal F, Vivadent, Schaan, Liechtenstein: 20% fluorosilicate glass, 41% anorganic filler).   A clinical split-mouth-study was performed to compare the retention behavior (3 categories: A=full retention, B=partial loss, C=total loss) and surface texture (porosities, marginal defects; modified according to USPHS) of the two fissure sealant materials. 20 first and second permanent lower molars of 10 participating children (7-14 years) were divided at random into two experimental groups. Both materials were applied according to the manufacturer’s instructions.   Reexaminations were performed after 3 months by a second calibrated dentist. Chi-square-statistics (SPSS) was used to calculate differences in retention behavior between the materials, t-test to describe differences in the surface texture.   After 3 months, no total loss of any sealant could be detected (category C=0%). Full retention (category A) was observed in all 10 cases (100%) of Helioseal-sealants. In the case of Dyract-sealants only two sealants (20%) were completely in situ. The statistical analysis focusing on retention behavior, showed a significant difference between the two groups (p<0.001). There were no significant differences in the number of porosities between both materials after the examination period (t-test, p>0.05). It can be concluded, that the retention of the compomere based fissure sealant material doesn’t have the same clinical properties compared to composite-sealants.