The objective of this study was to evaluate the effect of functionalizing a dental adhesive resin with YbF_3/SiO_2 fillers for use as radiopacifiers.Particles of YbF_3/SiO_2 were obtained with the high-energy mechanic...The objective of this study was to evaluate the effect of functionalizing a dental adhesive resin with YbF_3/SiO_2 fillers for use as radiopacifiers.Particles of YbF_3/SiO_2 were obtained with the high-energy mechanical milling method and characterized by both physical and chemical methods.After characterization,the particles were sieved and silanized prior to being incorporated into an adhesive resin.The stability of the particle suspension was then evaluated.After light activation,the radiopacity,degree of conversion,flexural strength and elastic modulus were determined.The dental adhesive resins with 10 and 15 wt% of filler provided satisfactory radiopacity,while flexural strength and elastic modulus were not affected.The degree of conversion was statistically lower than that of the control(p<0.05).The method used for incorporating the tested ytterbium fluoride/silicon dioxide particles at concentrations of 10 and 15 wt% was shown to be feasible for the development of a radiopaque dental adhesive system.展开更多
Colloidal LiYbF4：Er3＋ nanorods were synthesized in all aqueous system which had the ratio of length to diameter of-2. These LiYbF4：Er3＋ nanorods emitted intense upconversion light under excitation of infrared at 1...Colloidal LiYbF4：Er3＋ nanorods were synthesized in all aqueous system which had the ratio of length to diameter of-2. These LiYbF4：Er3＋ nanorods emitted intense upconversion light under excitation of infrared at 1488 nm. Importantly, the intensities of two- and three-photon anti-Stokes upconversion PL bands were observed which were comparable to that of the Stokes emission under excitation with low power density. The plots of excitation power density versus emission intensity indicated that all tile emis- sions centered at 549, 668, and 978 nm took a two-photon upconversion process. However, it could be simply deduced that the energy of two photons of 1488 nm were inadequate to produce a photon of 668 or 549 nm. For this conflict, the shape and saturation effects in the intermediate energy states were introduced to demonstrate the corresponding upeonversion processes.展开更多
基金the Brazilian National Council for Scientific and Technological Development for financial support,FAPERGS,CNPq,and CAPES
文摘The objective of this study was to evaluate the effect of functionalizing a dental adhesive resin with YbF_3/SiO_2 fillers for use as radiopacifiers.Particles of YbF_3/SiO_2 were obtained with the high-energy mechanical milling method and characterized by both physical and chemical methods.After characterization,the particles were sieved and silanized prior to being incorporated into an adhesive resin.The stability of the particle suspension was then evaluated.After light activation,the radiopacity,degree of conversion,flexural strength and elastic modulus were determined.The dental adhesive resins with 10 and 15 wt% of filler provided satisfactory radiopacity,while flexural strength and elastic modulus were not affected.The degree of conversion was statistically lower than that of the control(p<0.05).The method used for incorporating the tested ytterbium fluoride/silicon dioxide particles at concentrations of 10 and 15 wt% was shown to be feasible for the development of a radiopaque dental adhesive system.
基金supported by Scientific Research Fund of Hunan Provincial Education Department (10C0661)
文摘Colloidal LiYbF4：Er3＋ nanorods were synthesized in all aqueous system which had the ratio of length to diameter of-2. These LiYbF4：Er3＋ nanorods emitted intense upconversion light under excitation of infrared at 1488 nm. Importantly, the intensities of two- and three-photon anti-Stokes upconversion PL bands were observed which were comparable to that of the Stokes emission under excitation with low power density. The plots of excitation power density versus emission intensity indicated that all tile emis- sions centered at 549, 668, and 978 nm took a two-photon upconversion process. However, it could be simply deduced that the energy of two photons of 1488 nm were inadequate to produce a photon of 668 or 549 nm. For this conflict, the shape and saturation effects in the intermediate energy states were introduced to demonstrate the corresponding upeonversion processes.
