目的观察血小板衍生生长因子-BB(PDGF-BB)与胰岛素样生长因子-Ⅰ(IGF-Ⅰ)联合应用对大鼠正畸牙压力侧牙周膜细胞(PDLCs)中整合素β3蛋白表达的影响。方法建立SD大鼠正畸牙移动模型,隔日于正畸牙颊侧牙龈黏膜下单独或联合注射10 ng PDGF...目的观察血小板衍生生长因子-BB(PDGF-BB)与胰岛素样生长因子-Ⅰ(IGF-Ⅰ)联合应用对大鼠正畸牙压力侧牙周膜细胞(PDLCs)中整合素β3蛋白表达的影响。方法建立SD大鼠正畸牙移动模型,隔日于正畸牙颊侧牙龈黏膜下单独或联合注射10 ng PDGF-BB及200 ng IGF-Ⅰ,加力10 d后处死大鼠,取材用免疫组织化学方法检测正畸牙压力侧牙周膜细胞中整合素β3的表达。结果 PDGF-BB、IGF-Ⅰ单独或联合应用均能增强压力侧牙周膜细胞中整合素β3表达(P<0.01);与PDGF-BB、IGF-Ⅰ单独应用比较,IGF-Ⅰ加PDGF-BB组牙周膜细胞中整合素β3表达明显增强(P<0.05和P<0.01)。结论外源性PDGF-BB和IGF-Ⅰ在大鼠正畸牙的局部注射能上调压力侧牙周膜细胞中整合素β3表达,二者联合应用具有协同效应。展开更多
A dual motion combined by radial and tangential fretting was achieved on a modified hydraulic fretting wear test rig. The dual motion fretting tests of medical pure titanium （TA2） and Ti6Al7Nb alloy in artificial sa...A dual motion combined by radial and tangential fretting was achieved on a modified hydraulic fretting wear test rig. The dual motion fretting tests of medical pure titanium （TA2） and Ti6Al7Nb alloy in artificial saliva were carried out under varied contact inclined angles （45° and 60°）, and the maximum imposed load varied from 200 to 400 N at a constant loading speed of 6 mm/min. The effects of the cyclic vertical force and the inclined angle were investigated in detail. Dynamic analysis in combination with microscopic examinations shows that the wear scar and plastic deformation accumulation present a strong asymmetry. The Ti6Al7Nb has better wear resistance than TA2 in artificial saliva at the same test parameters, and with the increase of inclined angle and decrease of imposed load, the wear reduces accordingly. The wear mechanisms of pure titanium TA2 and Ti6Al7Nb alloy under the condition of dual motion fretting in artificial saliva are abrasive wear, oxidative wear and delamination.展开更多
The tribology behaviors of Ti6Al7Nb,its alloy with N-ion implantation,and its alloy with diamond-like carbon(DLC)coating were investigated in artificial saliva.Fretting wear tests of untreated,N-ion implanted and DLC ...The tribology behaviors of Ti6Al7Nb,its alloy with N-ion implantation,and its alloy with diamond-like carbon(DLC)coating were investigated in artificial saliva.Fretting wear tests of untreated,N-ion implanted and DLC coated Ti6Al7Nb alloys plate against a Si3N4ball were carried out on a reciprocating sliding fretting wear test rig.Based on the analysis of X-ray diffraction,Raman spectroscopy,3-D profiler,SEM morphologies and frictional kinetics behavior analysis,the damage behavior of surface modification layer was discussed in detail.The results indicated that the fretting wear behavior of Ti6Al7Nb alloy with N-ion implantation was increased with the dose increase of the implanted nitrogen ions.Moreover,the DLC-coated Ti6Al7Nb alloy with low ion implantation could improve the fretting wear behavior greatly.In addition,the Ti6Al7Nb with DLC coating had better ncorrosion resistance due to the special compact structure.All results suggested that the Ti6Al7Nb with DLC coating had better wear resistance than that with N-ion implantation in artificial saliva.展开更多
文摘目的观察血小板衍生生长因子-BB(PDGF-BB)与胰岛素样生长因子-Ⅰ(IGF-Ⅰ)联合应用对大鼠正畸牙压力侧牙周膜细胞(PDLCs)中整合素β3蛋白表达的影响。方法建立SD大鼠正畸牙移动模型,隔日于正畸牙颊侧牙龈黏膜下单独或联合注射10 ng PDGF-BB及200 ng IGF-Ⅰ,加力10 d后处死大鼠,取材用免疫组织化学方法检测正畸牙压力侧牙周膜细胞中整合素β3的表达。结果 PDGF-BB、IGF-Ⅰ单独或联合应用均能增强压力侧牙周膜细胞中整合素β3表达(P<0.01);与PDGF-BB、IGF-Ⅰ单独应用比较,IGF-Ⅰ加PDGF-BB组牙周膜细胞中整合素β3表达明显增强(P<0.05和P<0.01)。结论外源性PDGF-BB和IGF-Ⅰ在大鼠正畸牙的局部注射能上调压力侧牙周膜细胞中整合素β3表达,二者联合应用具有协同效应。
基金Project(81170996)supported by the National Natural Science Foundation of China
文摘A dual motion combined by radial and tangential fretting was achieved on a modified hydraulic fretting wear test rig. The dual motion fretting tests of medical pure titanium （TA2） and Ti6Al7Nb alloy in artificial saliva were carried out under varied contact inclined angles （45° and 60°）, and the maximum imposed load varied from 200 to 400 N at a constant loading speed of 6 mm/min. The effects of the cyclic vertical force and the inclined angle were investigated in detail. Dynamic analysis in combination with microscopic examinations shows that the wear scar and plastic deformation accumulation present a strong asymmetry. The Ti6Al7Nb has better wear resistance than TA2 in artificial saliva at the same test parameters, and with the increase of inclined angle and decrease of imposed load, the wear reduces accordingly. The wear mechanisms of pure titanium TA2 and Ti6Al7Nb alloy under the condition of dual motion fretting in artificial saliva are abrasive wear, oxidative wear and delamination.
文摘The tribology behaviors of Ti6Al7Nb,its alloy with N-ion implantation,and its alloy with diamond-like carbon(DLC)coating were investigated in artificial saliva.Fretting wear tests of untreated,N-ion implanted and DLC coated Ti6Al7Nb alloys plate against a Si3N4ball were carried out on a reciprocating sliding fretting wear test rig.Based on the analysis of X-ray diffraction,Raman spectroscopy,3-D profiler,SEM morphologies and frictional kinetics behavior analysis,the damage behavior of surface modification layer was discussed in detail.The results indicated that the fretting wear behavior of Ti6Al7Nb alloy with N-ion implantation was increased with the dose increase of the implanted nitrogen ions.Moreover,the DLC-coated Ti6Al7Nb alloy with low ion implantation could improve the fretting wear behavior greatly.In addition,the Ti6Al7Nb with DLC coating had better ncorrosion resistance due to the special compact structure.All results suggested that the Ti6Al7Nb with DLC coating had better wear resistance than that with N-ion implantation in artificial saliva.
