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Wang X.-j.,The 458 Hospital of Chinese PLA
Journal of Clinical Rehabilitative Tissue Engineering Research | Year: 2011

BACKGROUND: High production costs and weak bonding strength of titanium limit the use of titanium porcelain, in order to reduce the cost of titanium porcelain, replace nickel-chromium alloy porcelain repair, and improve security of fixed dental prosthetics. A kind of new titanium-bonding-porcelain powder GGW is produced and the properties are tested. OBJECTIVE: To test the bond strength of new titanium-bonding-porcelain GGW to cast titanium. METHODS: A three-point bending test was used according to ISO 9693 and SEM with energy-dispersive spectrometry analysis to evaluate the bond strength of GGW titanium bonding porcelain to cast titanium. RESULTS AND CONCLUSION: The bond strength of new titanium-bonding-porcelain GGW to cast titanium was higher obviously than that of Super Porcelain TI-22 to cast titanium. GGW titanium experimental bonding porcelain with titanium had chemical reaction, formed by a large number of parallel arrays of layered substructure composed of fracture energy higher crystalling phase organization. Titanium/porcelain rupture occurred in these crystal structure layers, the fracture mode performance for the intergranular and wear crystal mixed form. Titanium-bonding-porcelain GGW has a promising future. Source


Xu H.-T.,The 458 Hospital of Chinese PLA | Li S.,The 458 Hospital of Chinese PLA | Liu L.,The 458 Hospital of Chinese PLA | Lai Q.-L.,The 458 Hospital of Chinese PLA | And 3 more authors.
Journal of Clinical Rehabilitative Tissue Engineering Research | Year: 2011

BACKGROUND: Traditional Chinese manipulation maneuver is researched using computer technology and finite element method, which can explain the action mechanism, indication and contraindication of manipulation and provide objective, scientific, theoretical basis for clinical lumbar obligue-pulling manipulation. OBJECTIVE: To study the trait of displacement and intra-stress distribution of intervertebral disc during lumbar obligue-pulling manipulation. METHODS: 3D finite element model of L4-5 segments were constructed based on normal lumbar CT images with Mimics software system. The lumbar obligue-pulling manipulation was decomposed by principium of manipulation. The parameter of mechanics was analyzed with the finite element system. The change of intra-stress distribution and displacement in lumbar intervertebral disc were displayed simultaneous during simulating manipulation. RESULTS AND CONCLUSION: The intra-stress of posterior area was smaller than that of intervertebral disc during the lumbar obligue-pulling manipulation. There was a palinal vector from center of the intervertebral disc to the right, which distorted the intervertebral disc. The lumbar obligue-pulling manipulation is safe to the intervertebral disc, and it is more rational for manipulation in the healthy side. The manipulation is not applicable to lumbar spinal stenosis. Source

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