The impact of Er:YAG laser enamel conditioning on the microleakage of a new hydrophilic sealant — UltraSeal XT® hydro™

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 30s. 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

CO 2

This study evaluated the effect of CO2 laser irradiation and topical fluoride therapy in the control of caries progression on primary teeth enamel. 30 fragments (3×3×2 mm) from primary canines were submitted to an initial cariogenic challenge that consisted of immersion on demineralizing solution for 3 hours and remineralizing solution for 21 hours for 5 days. Fragments were randomly assigned into three groups (n=10): L: CO2 laser (λ=10.6 μm), APF: 1.23% acidulated phosphate fluoride, and C: no treatment (control). CO2 laser was applied with 0.5 W power and 0.44 J/cm2 energy density. Fluoride application was performed with 0.1 g for 1 minute. Cariogenic challenge was conducted for 5 days following protocol previously described. Subsurface Knoop microhardness was measured at 30 μm from the edge. Obtained data were subjected to analysis the variance (ANOVA) and Duncan test with significance of 5%. It was found that the L group showed greater control of deciduous enamel demineralization and were similar to those of APF group, while being statistically different from C group (P≤0.05) that showed the lowest microhardness values. It was concluded that CO2 laser can be an additional resource in caries control progression on primary teeth enamel

New evidence of the evolutionary relationship of the flavida complex with the genus Panstrongylus (Hemiptera, Triatominae) by karyosystematic

Submitted by Sandra Infurna ([email protected]) on 2018-10-04T11:34:56Z No. of bitstreams: 1 FFF_moreira_etal_IOC_2018.pdf: 729627 bytes, checksum: 3022397dc5eb63420c03f4e4599a05d4 (MD5)Approved for entry into archive by Sandra Infurna ([email protected]) on 2018-10-04T11:43:47Z (GMT) No. of bitstreams: 1 FFF_moreira_etal_IOC_2018.pdf: 729627 bytes, checksum: 3022397dc5eb63420c03f4e4599a05d4 (MD5)Made available in DSpace on 2018-10-04T11:43:47Z (GMT). No. of bitstreams: 1 FFF_moreira_etal_IOC_2018.pdf: 729627 bytes, checksum: 3022397dc5eb63420c03f4e4599a05d4 (MD5) Previous issue date: 2018Universidade Estadual Paulista “Júlio de Mesquita Filho. Instituto de Biociências, Letras e Ciências Exatas. Departamento de Biologia. Laboratório de Biologia Celular. São José do Rio Preto, SP, Brasil.Universidade Estadual Paulista “Júlio de Mesquita Filho. Instituto de Biociências, Letras e Ciências Exatas. Departamento de Biologia. Laboratório de Biologia Celular. São José do Rio Preto, SP, Brasil.Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biodiversidade Entomológica. Rio de Janeiro, RJ. BrasilUniversidade Estadual Paulista “Júlio de Mesquita Filho. Instituto de Biociências, Letras e Ciências Exatas. Departamento de Biologia. Laboratório de Biologia Celular. São José do Rio Preto, SP, Brasil.Universidade Estadual Paulista “Júlio de Mesquita Filho. Instituto de Biociências, Letras e Ciências Exatas. Departamento de Biologia. Laboratório de Biologia Celular. São José do Rio Preto, SP, Brasil

The impact of Er:YAG laser enamel conditioning on the microleakage of a new hydrophilic sealant — UltraSeal XT® hydro™

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 30s. 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