A novel kind of fluorescent nanoparticles（FNPs）has been prepared using a precipitation polymerization method.Methacrylic acid,trimethylolpropane trimethacrylate and azobisisobutyronitrile were used as functional-mon...A novel kind of fluorescent nanoparticles（FNPs）has been prepared using a precipitation polymerization method.Methacrylic acid,trimethylolpropane trimethacrylate and azobisisobutyronitrile were used as functional-monomer,cross-linker and initiator, respectively.Compared with other fluorescent nanoparticles,the FNPs have the characteristics including low dye leakage and good photostability.The fluorescence microscopy imaging indicates that the FNPs can be used as fluorescent labels in bioanalysis.展开更多
The aim of the present study was to compare sealing abilities of Resilon/Epiphany (R/E) with those of guttapercha and Kerr Pulp Canal Sealer EWT (GP/PCS). 50 single rooted teeth were randomly divided into 2 groups (n ...The aim of the present study was to compare sealing abilities of Resilon/Epiphany (R/E) with those of guttapercha and Kerr Pulp Canal Sealer EWT (GP/PCS). 50 single rooted teeth were randomly divided into 2 groups (n = 22) (R/E;GP/PCS), and 2 control groups (n = 3) (Positive, Negative). Fluid flow rate through the filled roots was measured using a fluid filtration device. The same specimens were immersed in a 2% Methylen Blue Solution. Roots were embedded in clear epoxy resin and cross sectionet at 1 mm intervals along the length of the root. Circumferential dye penetration was evaluated at 40× magnification. Fluid filtration of teeth obturated with the R/E system (0.085 [0.057, 0.113] μL·min-1), and dye penetration test showed no statistically significant difference compared to those obturated with GP/PCS (0.113 [0.057, 0.141] μL·min-1). Within the limits of the present study, there is no statistically significant difference between R/E and GP/PCS sealing abilities.展开更多
目的:评价根尖倒充填材料iRoot BP Plus的根尖封闭性。方法:选取新鲜拔除未行牙髓治疗的30颗下颌磨牙,截取远中根,机用镍钛锉根备,牙胶加氧化锌丁香油糊剂冷侧压法根充。根管口使用玻璃离子覆盖,蒸馏水中保存一周后取出牙根,随机分成银...目的:评价根尖倒充填材料iRoot BP Plus的根尖封闭性。方法:选取新鲜拔除未行牙髓治疗的30颗下颌磨牙,截取远中根,机用镍钛锉根备,牙胶加氧化锌丁香油糊剂冷侧压法根充。根管口使用玻璃离子覆盖,蒸馏水中保存一周后取出牙根,随机分成银汞、iRoot BP Plus和MTA三组,分别行截根,倒预备,倒充填。截根长度和倒预备洞型深度均为3mm,倒预备洞型宽度略宽于超声工作尖尖端直径。根尖使用PBS溶液调伴的藻酸盐包裹,在PBS溶液中浸泡一周后取出,干燥,除根尖截面外牙根表面涂2层指甲油,2%亚甲基蓝溶液染色一周,牙根纵行剖开后在16倍手术显微镜下测量线性渗漏值。统计数据用SPSS22分析,采用单因素方差分析,组间差异用Tamhane’s T2法分析。结果:各组渗漏值(均值±标准差)为:银汞(2. 07±0. 86mm),iRoot BP Plus(0. 11±0. 08mm),MTA(0. 17±0. 14mm),单因素方差分析显示不同组渗漏存在显著差异,组间比较显示iRoot BP Plus组和MTA组渗漏无显著差异,显著小于银汞组。结论:iRoot BP Plus根尖封闭性与MTA无显著差异,显著优于银汞合金。展开更多
基金supported by the National Natural Science Foundation of China(No.30470886).
文摘A novel kind of fluorescent nanoparticles（FNPs）has been prepared using a precipitation polymerization method.Methacrylic acid,trimethylolpropane trimethacrylate and azobisisobutyronitrile were used as functional-monomer,cross-linker and initiator, respectively.Compared with other fluorescent nanoparticles,the FNPs have the characteristics including low dye leakage and good photostability.The fluorescence microscopy imaging indicates that the FNPs can be used as fluorescent labels in bioanalysis.
文摘The aim of the present study was to compare sealing abilities of Resilon/Epiphany (R/E) with those of guttapercha and Kerr Pulp Canal Sealer EWT (GP/PCS). 50 single rooted teeth were randomly divided into 2 groups (n = 22) (R/E;GP/PCS), and 2 control groups (n = 3) (Positive, Negative). Fluid flow rate through the filled roots was measured using a fluid filtration device. The same specimens were immersed in a 2% Methylen Blue Solution. Roots were embedded in clear epoxy resin and cross sectionet at 1 mm intervals along the length of the root. Circumferential dye penetration was evaluated at 40× magnification. Fluid filtration of teeth obturated with the R/E system (0.085 [0.057, 0.113] μL·min-1), and dye penetration test showed no statistically significant difference compared to those obturated with GP/PCS (0.113 [0.057, 0.141] μL·min-1). Within the limits of the present study, there is no statistically significant difference between R/E and GP/PCS sealing abilities.
文摘目的:评价根尖倒充填材料iRoot BP Plus的根尖封闭性。方法:选取新鲜拔除未行牙髓治疗的30颗下颌磨牙,截取远中根,机用镍钛锉根备,牙胶加氧化锌丁香油糊剂冷侧压法根充。根管口使用玻璃离子覆盖,蒸馏水中保存一周后取出牙根,随机分成银汞、iRoot BP Plus和MTA三组,分别行截根,倒预备,倒充填。截根长度和倒预备洞型深度均为3mm,倒预备洞型宽度略宽于超声工作尖尖端直径。根尖使用PBS溶液调伴的藻酸盐包裹,在PBS溶液中浸泡一周后取出,干燥,除根尖截面外牙根表面涂2层指甲油,2%亚甲基蓝溶液染色一周,牙根纵行剖开后在16倍手术显微镜下测量线性渗漏值。统计数据用SPSS22分析,采用单因素方差分析,组间差异用Tamhane’s T2法分析。结果:各组渗漏值(均值±标准差)为:银汞(2. 07±0. 86mm),iRoot BP Plus(0. 11±0. 08mm),MTA(0. 17±0. 14mm),单因素方差分析显示不同组渗漏存在显著差异,组间比较显示iRoot BP Plus组和MTA组渗漏无显著差异,显著小于银汞组。结论:iRoot BP Plus根尖封闭性与MTA无显著差异,显著优于银汞合金。
