Three-dimensional analysis of peri-bone–implant contact of rough-surface miniscrew implants

2011 ◽  
Vol 139 (2) ◽  
pp. e153-e163 ◽  
Author(s):  
Hedeki Ikeda ◽  
P. Emile Rossouw ◽  
Phillip M. Campbell ◽  
Elias Kontogirogos ◽  
Peter H. Buschang
Keyword(s):  
Rough Surface ◽  
Dimensional Analysis ◽  
Three Dimensional ◽  
Bone Implant ◽  
Miniscrew Implants ◽  
Bone Implant Contact

scholarly journals Enhanced osteogenesis of quasi-three-dimensional hierarchical topography

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Mengfei Yu ◽  
Yu Liu ◽  
Xiaowen Yu ◽  
Jianhua Li ◽  
Wenquan Zhao ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Extracellular Matrices ◽  
New Bone Formation ◽  
Bone Implant ◽  
Multi Scale ◽  
Bone Implant Contact ◽  
Implant Coatings ◽  
Important Design ◽  
Multi Scales

Abstract Natural extracellular matrices (ECMs) are three-dimensional (3D) and multi-scale hierarchical structure. However, coatings used as ECM-mimicking structures for osteogenesis are typically two-dimensional or single-scaled. Here, we design a distinct quasi-three-dimensional hierarchical topography integrated of density-controlled titania nanodots and nanorods. We find cellular pseudopods preferred to anchor deeply across the distinct 3D topography, dependently of the relative density of nanorods, which promote the osteogenic differentiation of osteoblast but not the viability of fibroblast. The in vivo experimental results further indicate that the new bone formation, the relative bone-implant contact as well as the push-put strength, are significantly enhanced on the 3D hierarchical topography. We also show that the exposures of HFN7.1 and mAb1937 critical functional motifs of fibronectin for cellular anchorage are up-regulated on the 3D hierarchical topography, which might synergistically promote the osteogenesis. Our findings suggest the multi-dimensions and multi-scales as vital characteristic of cell-ECM interactions and as an important design parameter for bone implant coatings.

In situ investigation of the primary recrystallization of alpha titanium in HVEM

1978 ◽  
Vol 36 (1) ◽  
pp. 634-635
Author(s):  
S. Naka ◽  
R. Penelle ◽  
R. Valle
Keyword(s):  
Dimensional Analysis ◽  
Texture Evolution ◽  
Cold Work ◽  
Three Dimensional ◽  
Primary Recrystallization ◽  
Thin Foils ◽  
In Situ Investigation ◽  
Grain Growth Model ◽  
Alpha Titanium

The in situ experimentation technique in HVEM seems to be particularly suitable to clarify the processes involved in recrystallization. The material under investigation was unidirectionally cold-rolled titanium of commercial purity. The problem was approached in two different ways. The three-dimensional analysis of textures was used to describe the texture evolution during the primary recrystallization. Observations of bulk-annealed specimens or thin foils annealed in the microscope were also made in order to provide information concerning the mechanisms involved in the formation of new grains. In contrast to the already published work on titanium, this investigation takes into consideration different values of the cold-work ratio, the temperature and the annealing time.Two different models are commonly used to explain the recrystallization textures i.e. the selective grain growth model (Beck) or the oriented nucleation model (Burgers). The three-dimensional analysis of both the rolling and recrystallization textures was performed to identify the mechanismsl involved in the recrystallization of titanium.

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