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不同种植扭力对一段式种植体骨结合影响的动物实验研究 被引量:1
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作者 孟岑 谭包生 《中国口腔种植学杂志》 2009年第2期130-131,共2页
实验目的:本研究的目的是通过动物实验观察用不同扭矩植入的一段式种植体与骨结合的情况。实验方法:选取4只成年雄性杂种狗,体重10-15Kg,分别拔除每只狗的双侧第一第二前磨牙,待3个月后分别以20Ncm、30Ncm、40Ncm的力矩旋入BLB种植体各... 实验目的:本研究的目的是通过动物实验观察用不同扭矩植入的一段式种植体与骨结合的情况。实验方法:选取4只成年雄性杂种狗,体重10-15Kg,分别拔除每只狗的双侧第一第二前磨牙,待3个月后分别以20Ncm、30Ncm、40Ncm的力矩旋入BLB种植体各一枚,即刻安装上部基台结构并调整咬合,每只狗在植入种植体术后一个月和三个月时拍片观察其影像学改变,于种植术后一个月和三个月时分别处死两只狗取标本,观察其组织学的改变。实验结果:12枚种植体中以30Ncm、40Ncm植入的8枚种植体获得了良好的骨结合,种植体周围包饶着致密的骨组织,未观察到任何间隙和结缔组织长入,另外以20Ncm植入的4枚种植体中3枚脱落,1枚松动。实验结论:在30Ncm及40Ncm扭转力矩下旋入的一段式种植体可获得良好的骨结合。 展开更多
关键词 one-stage implant insertion torque force
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Five-plane lancet needle design for soft PVC phantom tissue cutting 被引量:1
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作者 Yancheng Wang Deqing Mei 《Bio-Design and Manufacturing》 2018年第3期195-202,共8页
Lancet needle, having three planes at the tip to generate a sharp lancet point, is the most common needle tip geometry and used for medical procedures. This research presents two five-plane lancet needle designs, the ... Lancet needle, having three planes at the tip to generate a sharp lancet point, is the most common needle tip geometry and used for medical procedures. This research presents two five-plane lancet needle designs, the five-plane lancet needle with two back bevels (FLN-B) and five-plane lancet needle with two front bevels (FLN-F), to study the effects of two additional bevel planes on the reduction of soft tissue cutting force. Mathematical models to calculate the inclination angle and rake angle along the cutting edges of FLN-B and FLN-F are developed. By using the grinding process, the prototype FLN-B and FLN-F needles are fabricated. And their inclination and rake angles along the cutting edges are investigated and compared to that of regular lancet needle. Needles insertion tests were conducted on soft PVC phantom which mimics the soft tissue. The initial peak insertion force and steady-state cutting force during needle insertion were identified, and the effect of cutting edge on needle soft tissue cutting force was studied. Compared to lancet needle, FLN-B and FLN-F both have higher inclination and rake angles at the tip cutting edge, could reduce the initial peak needle insertion force and tissue cutting forces, and thus can efficiently cut the soft tissue for medical applications. 展开更多
关键词 Lancet needle Needle insertion force Rake angle Inclination angle Bevels Five plane
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Effects of Micro-Milling and Laser Engraving on Processing Quality and Implantation Mechanics of PEG-Dexamethasone Coated Neural Probe 被引量:1
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作者 ZHOU Xuhui ZHANG Wenguang XIE Jie 《Journal of Shanghai Jiaotong university(Science)》 EI 2021年第1期1-9,共9页
Compared with stiff silicon-based probes,flexible neural probes can alleviate biological inflammation and tissue rejection.A polyethylene glycol(PEG)coating can facilitate the insertion of flexible probes,and the fabr... Compared with stiff silicon-based probes,flexible neural probes can alleviate biological inflammation and tissue rejection.A polyethylene glycol(PEG)coating can facilitate the insertion of flexible probes,and the fabrication methods have a significant impact on the dimensional accuracy and structural strength of the coating.In this study,a novel melting injection moulding method is used to process a PEG-dexamethasone(PEG-DEX)coating with high structural strength for a type of mesh-shaped photosensitive polyimide(PSPI)based neural probe.Combined with the digital image correlation(DIC)method,an in vitro test system with high accuracy is developed to evaluate the effects of the elastic modulus of the PEG component and two fabrication methods,i.e.,computer-numerical-control(CNC)micro-milling and laser engraving,on the processing quality and implantation mechanics of a PEG-DEX coated probe.The results show that compared with laser engraving,CNC micro-milling can ensure high dimensional accuracy and sharpness for the composite coating,thus leading to small damage from implantation,whereas the elastic modulus of the composite coating has a limited effect on the implantation mechanics of the PEG-DEX coated probe. 展开更多
关键词 flexible neural probe composite coating digital image correlation(DIC) polyethylene glycol(PEG) dexamethasone(DEX) insertion force implantation injury
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