[The Correlation Analysis of Turnover Intention,Moral Distress and Stressor in Nurses].

Objective: To explore the turnover intention of nurses in Quzhou and its influential factors. Methods: From July to August in 2017 cross-sectional study and self-filled questionnaire are used to investigate 980 nurses from 7 hospitals in Quzhou, including two third-level hospitals and five second-level ones. T-test, F-test, Pearson and linear regression are used in data with the method of statistical analysis. Results: The total score of turnover intention of nurses was (14.95±3.17) points, and the index value was 62.27%, of which the turnover intention was above 78%. The analysis of Single factor showed that age (F=4.895) , Department (F=2.971) , title, nursing age (F=5.863) , self-assessment of physical conditions (F=4.092) were closely related to nurses' turnover intention(P<0.05). According to Person's correlation analysis, there are positive correlations between turnover intention and source of stressor, and moral distress (P<0.05) . Multiple linear regression showed that the nurses' turnover intention was age, Department, health selfevaluation, stressor and moral distress. Conclusion: The turnover intention of nurses is high, which is related to age, Department, self-evaluation of health, stressor and moral distress.

Biomechanical responses of human temporomandibular joint disc under tension and compression.

The purpose of this study was to observe the microscopic changes in the temporomandibular joint (TMJ) disc in response to tension and compression, and to study the mechanism of disc failure when subjected to mechanical stresses. The scanning electron microscope was used to observe topographic characteristics of TMJ disc samples obtained from 13 cadavers before and during biomechanical experiments. The stress relaxation experiments were conducted at different strain levels (2, 3, 4 and 6%). The uniaxial tensile experiments were carried out at a constant strain rate (0.05 mm/s). The confined compression tests were performed with 3 different indenters (2, 3 and 4mm in diameter) for 150 s and 3 h. The maximal tensile strain of the disc was 5% (nearly equal to 0.22 MPa of tensile stress) in the mediolaterally tensile direction. Typical wavelike structure of the collagen fibrils of the disc was present at 2-4% strain ranges. Tensile and shear damage to local collagen fibrils was observed in specimens of the intermediate zone and the posterior band at 6% strain level. Changes in the collagen network from a wavelike structure to distortion observed on the surface of the testing samples were reversible in the 150-s indentation, but severe, irreversible breakdown and deformation of the collagen-proteoglycan network occurred in those specimens that had been compressed for 3h. Persistent and prolonged compression inevitably resulted in irrecoverable disc failure. Mechanical stress is a crucial factor in breakdown of the TMJ disc.