GÜÇLÜ, ZEYNEP ASLIDÖNMEZ, NAZMİYEHURT, Andrew pCOLEMAN, Nicola2019-10-052019-10-052016-08-01GÜÇLÜ Z. A. , DÖNMEZ N., HURT A. p. , COLEMAN N., -Characterisationand microleakage of a new hydrophilic fissure sealent-Ultraseal XT®hydro™.-, Journal Of Applied Oral Science, cilt.24, ss.344-351, 2016https://hdl.handle.net/20.500.12645/6866https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4990363/sealant, UltraSeal XT® hydro™ (Ultradent Products, USA), and to investigate its in vitro resistance to microleakage after placement on conventionally acid etched and sequentially lased and acid etched molars. Material and Methods: The sealant was characterised by Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and Vickers indentation test. Occlusal surfaces of extracted human molars were either conventionally acid etched (n=10), or sequentially acid etched and laser irradiated (n=10). UltraSeal XT® hydro™ was applied to both groups of teeth which were then subjected to 2,500 thermocycles between 5 and 55°C prior to microleakage assessment by fuchsin dye penetration. Results: UltraSeal XT® hydro™ is an acrylate-based sealant that achieved a degree of conversion of 50.6±2.2% and a Vickers microhardness of 24.2±1.5 under standard light curing (1,000 mWcm-2 for 20 s). Fluoride ion release is negligible within a 14-day period. SEM and EDX analyses indicated that the sealant comprises irregular submicron and nano-sized silicon-, barium-, and aluminium-bearing reduce microleakage (Mann-Whitney U test, p<0.001). The lased teeth presented enhancedeninfo:eu-repo/semantics/openAccessEr:YAG lasersHydrophilicFissure sealantsMicroleakageMicrohardnessArticleWOS:00038378880000610.1590/1678.77572016001027556205