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The control group consisted of 31 subjects with no TMJ symptoms.
      
No significant correlation between the degree of anterior disk displacement and palpation pain of the masticatory muscles or clicking/crepitus of the TMJ could be found.
      
Joint clicking was observed in 65% of patients with TMJ symptoms in normal disk position (NDP).
      
Condylar restoration after early TMJ fractures and functional appliance therapy
      
Condylar restoration after early TMJ fractures and functional applicance therapy
      
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Objective To investigate the internal state of stress distribution in healthy human condyles and to offer some references for application of the temporomandibular joint(TMJ) biomechanics. Methods Six male volunteers were selected to perform CT examination of the TMJ with 1.5 mm thick sections at 1.5 mm intervals. Three dimensional image reconstruction of the joint was performed in the SUN workstation and the CT data were converted into the decimal system. The three dimensional finite element...

Objective To investigate the internal state of stress distribution in healthy human condyles and to offer some references for application of the temporomandibular joint(TMJ) biomechanics. Methods Six male volunteers were selected to perform CT examination of the TMJ with 1.5 mm thick sections at 1.5 mm intervals. Three dimensional image reconstruction of the joint was performed in the SUN workstation and the CT data were converted into the decimal system. The three dimensional finite element model mesh generation resulted from 1188 elements and 264 nodes in each condyle. Stress calculation was performed with SAP V program, and the results were converted into mechanical density scalar. During the study, the internal state of stress distribution on each side condyle in every subject was analysed on the basis of loading on the anterior articular surface of the condyle. Results Stress was concentrated in the anterior articular surface of the condyle and was highest at the loading point. The condylar cortical bone was the main load bearing area. The level of stress distribution in the cancellous bone of the condyle was very low. Near condylar neck stress was well distributed on the cortical. The internal state of stress was essentially symmetrical on the same cuts of both side condyles. Conclusions The results showed that three dimensional finite element analysis may indicate the internal state of stress distribution in the condyle, suggesting that a combination of the three dimensional finite element methods and the three dimensional imaging technique may be a useful means for diagnosis and treatment of TMJ diseases.

StudyonstresdistributionofthecondyleHuMin胡敏,ZhouJilin周继林,HongMin洪民,MaHezhong马和中andTianXiaoling田晓玲ObjectiveToinvestigatetheint...

Objective:To observe the ultrastructural changes of the TMJ disc in response to tension and compression and to study the mechanism of disc failure by mechanical stress.Methods:SEM was used to observe the morphologic feature of TMJ disc samples in stress relaxation at different strain rate (2%,3%,4%and 6%)and in compression for 150 seconds and 3 hours.Results:Tensile and shear destruction of local collagen fibrils was observed in intermediate zone (IZ) and posterior band (PB) in the samples in 6%...

Objective:To observe the ultrastructural changes of the TMJ disc in response to tension and compression and to study the mechanism of disc failure by mechanical stress.Methods:SEM was used to observe the morphologic feature of TMJ disc samples in stress relaxation at different strain rate (2%,3%,4%and 6%)and in compression for 150 seconds and 3 hours.Results:Tensile and shear destruction of local collagen fibrils was observed in intermediate zone (IZ) and posterior band (PB) in the samples in 6% strain.Changes of wave like structure in the samples treated with 150 seconds compression were reversible;severe deformation of collagen architecture in those with 3 hours compression was irreversible.Conclusion:The maximal physiological tensile strain of the TMJ disc in mediolateral direction may be 5%(nearly 0.22 MPa of tenlile stress).Long time compression may result in unrecoverable disc failure. Mechanical stress must be an important factor for disc failure.

目的:观察人体颞下颌关节盘在拉伸和压缩状态下的超微结构改变,探讨机械应力导致关节盘破坏的有关机理。方法:用扫描电镜观察关节盘不同应变水平(2%、3%、4%、6%)拉伸试件及不同时间(150s,3h)围限压缩试件的变化。结果:关节盘在2%~4%应变下结构正常,6%应变产生中、后带局部胶原原纤维横向拉伸剪切破坏。150s压缩,盘表面波纹尚存;3h压缩,蛋白多糖大量丢失,胶原网暴露,胶原—蛋白多糖网状支架受压变形不能再复原。结论:关节盘可承受的最大横向拉应变为5%(约0.22MPa拉应力)。持续长时压缩可造成关节盘内部构筑不可复性改变。推测机械因素可能是导致关节盘破坏的重要病理机理。

砄bjective:To establish a TMJ model including mandible and the whole teeth by means of three dimensional finite element method.Methods:CT scanned transverse sections of TMJ including mandible were taken in young people,a three dimensional model (3 D FEM) of TMJ was established using computer with cable elements and compressive gap elements.Results:The model of the TMJ including mandible and the whole teeth,whose boundary condition is cable and gap element,was established.The TMJ...

砄bjective:To establish a TMJ model including mandible and the whole teeth by means of three dimensional finite element method.Methods:CT scanned transverse sections of TMJ including mandible were taken in young people,a three dimensional model (3 D FEM) of TMJ was established using computer with cable elements and compressive gap elements.Results:The model of the TMJ including mandible and the whole teeth,whose boundary condition is cable and gap element,was established.The TMJ model comprised condyle,glenoid fossa,articular disk and cartilaginous layer.The articular disk and condylar cartilage was constructed according to their normal shape and elastic modulus.The model consisted of 1 394×2 bricks and 2 014×2 nodes.Conclusion:The established 3 D FEM of TMJ including mandible and the whole teeth will improve the similarity of the model to the real TMJ in vivo .

目的:在计算机上建立包括下颌骨及其完整牙列的颞下颌关节(TMJ)三维正交各向异性有限元模型。方法:采用活体人颅为标本,用CT断层扫描技术、图形数字化等方法在计算机上建模,采用柔索约束、受压间隙元等形式进行边界约束。结果:建立了包括下颌骨的TMJ有限元模型,颞下颌关节区根据同龄人的结构形态和力学参数增加了髁突软骨和关节盘结构,同时采用了柔索约束模拟咀嚼肌肉、韧带的约束,在牙合面用间隙元模拟对颌牙的约束。结论:建立的包括下颌骨及其完整牙列的TMJ三维正交各向异性有限元模型,采用柔索、间隙元为边界条件,将大大提高模型的相似性,为TMJ及其下颌骨的受力分析奠定基础

 
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