目的：比较4种全瓷材料修复体的透明度参数（TP）及其在模拟不同颜色的四环素染色牙背景下的色差ΔE，评价其美学修复效果。方法制作4种不同全瓷材料（包括IPS e. max、Cercon、Lava、Girrbach）的修复体样本（n=8），用Datacolor 600...目的：比较4种全瓷材料修复体的透明度参数（TP）及其在模拟不同颜色的四环素染色牙背景下的色差ΔE，评价其美学修复效果。方法制作4种不同全瓷材料（包括IPS e. max、Cercon、Lava、Girrbach）的修复体样本（n=8），用Datacolor 600型分光测色仪测得每组样本在白色及黑色背景下的颜色参数，计算TP。用彩色打印机打印出黄、灰、深灰、暗红和亮红色5组颜色以模拟四环素染色基牙，并以此为背景，测得每组样本与2M2色瓷片的色差ΔE。结果 IPS e. max、Cercon、Lava、Girrbach组样本的TP值分别为15.67±0.58、7.56±0.43、9.55±0.25、9.73±0.43；IPS e. max组的TP值明显大于其他3组（P〈0.001）。IPS e. max组在黄色背景下的ΔE为1.33 NBS；Lava组和Girrbach组在灰、深灰、暗红和亮红色背景下的ΔE值在0.75~1.47 NBS之间。结论 IPS e. max组具有良好的透明度；在修复偏黄四环素染色牙时，IPS e. max的美学效果较好；而在修复灰、深灰、暗红和亮红色四环素染色牙时，Lava和Girrbach的美学效果较好。展开更多
In the presence of collective flow a new model potential describing the interaction of the hard jet with scattering centers is derived based on the static color-screened Yukawa potential.The flow effect on jet quenchi...In the presence of collective flow a new model potential describing the interaction of the hard jet with scattering centers is derived based on the static color-screened Yukawa potential.The flow effect on jet quenching with detailed balance is investigated in pQCD.It turns out,considering the collective flow with velocity vzalong the jet direction,the collective flow decreases the LPM destructive interference comparing to that in the static medium.The gluon absorption plays a more important role in the moving medium.The collective flow increases the energy gain from gluon absorption,however,decreases the energy loss from gluon radiation,which is(1-vz)times as that in the static medium to the first order of opacity.In the presence of collective flow,the second order in opacity correction is relatively small compared to the first order.So that the total effective energy loss is decreased.The flow dependence of the energy loss will affect the suppression of high pThadron spectrum and anisotropy parameter v2in high-energy heavy-ion collisions.展开更多
文摘目的：比较4种全瓷材料修复体的透明度参数（TP）及其在模拟不同颜色的四环素染色牙背景下的色差ΔE，评价其美学修复效果。方法制作4种不同全瓷材料（包括IPS e. max、Cercon、Lava、Girrbach）的修复体样本（n=8），用Datacolor 600型分光测色仪测得每组样本在白色及黑色背景下的颜色参数，计算TP。用彩色打印机打印出黄、灰、深灰、暗红和亮红色5组颜色以模拟四环素染色基牙，并以此为背景，测得每组样本与2M2色瓷片的色差ΔE。结果 IPS e. max、Cercon、Lava、Girrbach组样本的TP值分别为15.67±0.58、7.56±0.43、9.55±0.25、9.73±0.43；IPS e. max组的TP值明显大于其他3组（P〈0.001）。IPS e. max组在黄色背景下的ΔE为1.33 NBS；Lava组和Girrbach组在灰、深灰、暗红和亮红色背景下的ΔE值在0.75~1.47 NBS之间。结论 IPS e. max组具有良好的透明度；在修复偏黄四环素染色牙时，IPS e. max的美学效果较好；而在修复灰、深灰、暗红和亮红色四环素染色牙时，Lava和Girrbach的美学效果较好。
基金supported by the National Natural Science Foundation of China (Grant Nos.11205024,11221504 and 10825523)the Major State Basic Research Development Program in China (Grant No.2014CB845404)the Ministry of Education of China (the Doctoral Grant No.20120041120043)
文摘In the presence of collective flow a new model potential describing the interaction of the hard jet with scattering centers is derived based on the static color-screened Yukawa potential.The flow effect on jet quenching with detailed balance is investigated in pQCD.It turns out,considering the collective flow with velocity vzalong the jet direction,the collective flow decreases the LPM destructive interference comparing to that in the static medium.The gluon absorption plays a more important role in the moving medium.The collective flow increases the energy gain from gluon absorption,however,decreases the energy loss from gluon radiation,which is(1-vz)times as that in the static medium to the first order of opacity.In the presence of collective flow,the second order in opacity correction is relatively small compared to the first order.So that the total effective energy loss is decreased.The flow dependence of the energy loss will affect the suppression of high pThadron spectrum and anisotropy parameter v2in high-energy heavy-ion collisions.
