This study was aimed at the relationship model between LMX and work performance. Hypotheses mode was set up, and Chinese edition of LMX scale, team cohesion scale and team performance evaluation scale were used in this paper. 342 survey questionnaires were sent and 231 valid accounting for 67% of the total were received, the samples came from many industries, such as finance, energy, scientific research, IT and telecommunications, representing the state-owned, joint ventures, and private enterprises. Then, multiply stepwise regression, intermediary effect and regulatory effect analysis are used. Through those studies, we found that LMX had significantly positive effects on work performance and the team type and team cohesion affected the relationship between LMX and work performance as regulation variable and intermediary variable respectively. The follows also be found that in order to achieve performance targets, managers should strengthen exchange and communication with staff, care for members' feeling and special needs, show their care and support and build harmony subordinate relationship to promote team cohesion and work performance with good LMX.

(1) Background: Bacterial reinfection and root fracture are the main culprits related to root canal treatment failure. This study aimed to assess the utility of quercetin solution as an adjunctive endodontic irrigant that strengthen root canal dentin with commitment anti-biofilm activity and bio-safety. (2) Methods: Based on a noninvasive dentin infection model, dentin tubules infected with Enterococcus faecalis (E. faecalis) were irrigated with sterile water (control group), and 0, 1, 2, 4 wt% quercetin-containing ethanol solutions. The live and dead bacteria proportions within E. fae-calis biofilms were analyzed using confocal laser scanning microscopy (CLSM). Elastic modulus and hydroxyproline release and X-ray photoelectron spectroscopy (XPS) characterization was tested on irrigant-treated demineralized dentin to evaluate irrigants’ biostability. The cytotoxicity of irrigants was tested by CCK-8 assay. (3) Results: Quercetin increased the proportion of dead bacteria volumes within E. faecalis, and improved the flexural strength of dentin collagen com-pared to control group. The XPS characterization revealed an increase in C-O peak area under both C1s and O1s narrow-scan spectra. The CCK-8 assay confirmed no cytotoxicity of quercetin solutions. (4) Conclusions: Quercetin exhibited anti-biofilm activity, collagen-stabilizing effect as well as cytocompatibility, supporting quercetin as a potential candidate for endodontic irrigant.

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