title: The impact of Er:YAG laser enamel conditioning on the microleakage of a new hydrophilic sealant--UltraSeal XT hydro.
abstract: UltraSeal XT hydro is a new hydrophilic, light-cured, methacrylate-based pit and fissure sealant which has been developed by Ultradent Products, USA. The sealant is highly filled with a 53 wt.% mixture of inorganic particles which confer both thixotropy and radiopacity. The principal purpose of this study was to investigate the microleakage of UltraSeal XT hydro as a function of different enamel etching techniques. The occlusal surfaces of sound, extracted human molars were either acid etched, Er:YAG laser irradiated or successively laser irradiated and acid etched. UltraSeal XT hydro was applied to each group of teeth (n = 10) which were subjected to a thermocycling process consisting of 2500 cycles between 5 and 50 °C with a dwell time of 30 s. Microleakage assessments were then carried out using 0.5% fuchsin dye and optical microscopy. The microleakage score data were analysed using the Kruskal-Wallis, Mann-Whitney U test with Bonferroni adjustment. No significant differences in microleakage were noted between the individually acid etched and laser-irradiated groups (p > 0.05); however, teeth treated with a combination of laser irradiation and acid etching demonstrated significantly lower microleakage scores (p < 0.001). Electron microscopy with energy-dispersive X-ray analysis revealed that the mineral filler component of UltraSeal XT hydro essentially comprises micrometre-sized particles of inorganic silicon-, aluminium- and barium-bearing phases. Laser etching increases the roughness of the enamel surface which causes a concentrated zoning of the filler particles at the enamel-sealant interface.
authors.affiliation: Diş Hekimliği Fakültesi Pedodonti, Erciyes Üniversitesi, ABD 38039, Melikgazi, Kayseri, Turkey.
authors.forename: Z A
authors.initials: ZA
authors.lastname: Güçlü
authors.affiliation: Bezmialem Vakıf Üniversitesi, Diş Hastalıkları ve Tedavisi, ABD Adnan Menderes Bulvarı Vatan Caddesi, 34093, Fatih, İstanbul, Turkey.
authors.forename: N
authors.initials: N
authors.lastname: Dönmez
authors.affiliation: Diş Hekimliği Fakültesi Pedodonti, Karadeniz Teknik Üniversitesi, ABD Kanuni Kampüsü, 61080, Trabzon, Turkey.
authors.forename: T
authors.initials: T
authors.lastname: Tüzüner
authors.affiliation: Diş Hekimliği Fakültesi Dekanlık, Gazi Üniversitesi, Bişkek Caddesi 82 Sokak No:4 06510 Emek, Ankara, Turkey.
authors.forename: M E
authors.initials: ME
authors.lastname: Odabaş
authors.affiliation: Faculty of Science and Engineering, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK.
authors.forename: A P
authors.initials: AP
authors.lastname: Hurt
authors.affiliation: Faculty of Science and Engineering, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK. nj_coleman@yahoo.co.uk.
authors.forename: N J
authors.initials: NJ
authors.lastname: Coleman
mesh_terms: D003188:Composite Resins / Q000737:chemistry; D003743:Dental Enamel / Q000528:radiation effects* / Q000648:ultrastructure; D045662:Dental Etching / Q000379:methods*; D003763:Dental Leakage / Q000628:therapy; D006801:Humans; D053844:Lasers, Solid-State; D008963:Molar / Q000737:chemistry / Q000528:radiation effects / Q000648:ultrastructure; D010895:Pit and Fissure Sealants / Q000737:chemistry
chemical_list: D003188:Composite Resins; D010895:Pit and Fissure Sealants; C106663:Ultra Seal XT
keywords: Er:YAG laser; Hydrophilic fissure sealant; Microleakage; Scanning electron microscopy