[Study on the mechanism of endothelial progenitor cells in periodontal revascularization during orthodontic tooth movement].

Purpose: To investigate the mechanism of endothelial progenitor cells(EPCs) bone remodeling during orthodontic tooth movement.

Methods: Experimental tooth movement model was established. EPCs were isolated, cultured, and labeled with 10 μmol/L Brdu and injected into rats through tail vein to observe the distribution in periodontal tissue.

[Use of visual analogue scale and pain-related factors to evaluate the impact of different orthodontic forces on human dental pulp in patients who underwent fixed dental treatment].

Purpose: To investigate the role of visual analogue scale (VAS) and pain-related factors, like tumor necrosis factor-alpha (TNF-α), interleukin-8 (IL- 8), interleukin-6 (IL-6) and interleukin-1 beta (IL-1β) in evaluation of the impact of different orthodontic forces on human dental pulp in patients who underwent fixed dental treatment.

Methods: From January 2014 to April 2015, 156 patients with maxillary bilateral premolar treated with tooth fixed were randomly divided into 4 groups, 42 patients in control group, 40 patients in 100 g-force group, 40 patients in 150 g-force group, and 39 in 200 g-force group. VAS was used to evaluate before and after removed.