[The effect of fluoride on electrochemical corrosion of the dental pure titanium before and after adhesion of Streptococcus mutans].

Purpose: To investigate the effect of fluoride on electrochemical corrosion of the dental pure titanium before and after adhesion of Streptococcus mutans.

Methods: The dental pure titanium specimens were tested by electrochemical measurement system including electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve (PD) methods in artificial saliva with 0 g/L and 1.0 g/L sodium fluoride before and after dipped into culture medium with Streptococcus mutans for 24 h.

[The effect of fluoride on adhesion of Streptococcus mutans and Streptococcus sanguis on the dental pure titanium surface].

Purpose: This study was to investigate the effect of fluoride on adhesion of Streptococcus mutans and Streptococcus sanguis on the dental pure titanium surface.

Methods: The adhesion of Streptococcus mutans and Streptococcus sanguis on the dental pure titanium surface were examined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay after soaked in artificial saliva containing different concentrations of sodium fluoride for 24 h. Then the surface roughness and surface morphology of the pure titanium were analyzed by atomic force microscope after bacterial adhesion experiments.

[An in vitro comparison of the influence of different surface treatment on shear bond strength between zirconia and enamel].

Purpose: To compare the shear bond strength of zirconia to enamel using different surface treatments, in order to provide evidence for clinical practice.

Methods: Forty cut and fully sintered Lava frame zirconia blocks (2.7 mm × 2.

[The effect of epigallocatechin gallate (EGCG) on the surface properties of nickel-chromium dental casting alloys after electrochemical corrosion].

Purpose: To investigate the effect of epigallocatechin gallate (EGCG) on the surface properties of nickel-chromium dental alloys after electrochemical corrosion.

Methods: The surface morphology and surface structure of nickel-chromium dental alloys were examined by stereomicroscope and scanning electron microscopy before and after electrochemical tests in 0 g/L and 1.0 g/L EGCG artificial saliva.

[The effect of hydrogen peroxide on the electrochemical corrosion properties and metal ions release of nickel-chromium dental alloys].

Purpose: To investigate the effect of hydrogen peroxide on the electrochemical corrosion and metal ions release of nickel-chromium dental alloys.

Methods: The corrosion resistance of nickel-chromium dental alloys was compared by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve (PD) methods in artificial saliva after immersed in different concentrations of hydrogen peroxide for 112 h. The metal ions released from nickel-chromium dental alloys to the artificial saliva were detected after electrochemical measurements using inductively coupled plasma mass spectrometry (ICP-MS).

[Expression of Ki67 and P53 proteins in gingival tissue after wearing casting alloy crowns].

Objective: The aim of the study was to detect the expression of Ki67 and P53 proteins in the gingival tissue before and after wearing three kinds of dental casting alloy crowns.

Methods: The three kinds of dental casting alloys (58% golden alloy, NiCr alloy, NiCr alloy excluding Be) were used to make full crowns for 3 dogs in each group. Another 3 dogs were taken as control.

[Study on cytotoxicity of three kinds of dental ceramic alloys on L929 mouse fibroblasts in vitro].

Purpose: To investigate the cytotoxicity in vitro of three kinds of dental ceramic alloys on L929 mouse fibroblasts.

Methods: CCK-8 assay was a quick method to study the cell relative proliferation rate or cytotoxicity. L929 mouse fibroblasts were used to detect the cell relative proliferation rate of the three kinds of dental ceramic alloys(NiCr,CoCr and golden alloys containing 58% of gold) by CCK-8 assay.

[Cytotoxicity of three kinds of temporary crown and bridge materials on mouse fibroblasts in vitro].

Purpose: This study was to investigate the cytotoxicity in vitro of three kinds of common temporary crown and bridge materials, i.e.,self-curing resin, heat-curing resin, and DMG-TEMP bi-acrylic composite.

[Study of DNA damage of buccal mucosal cells after wearing casting alloy crowns].

Objective: To test the corrosion behavior of three kinds of dental casting alloys and to investigate the effect of the released metal ions on the DNA damage of dog buccal mucosal cells.

Methods: Three kinds of frequently used dental casting alloys were used to make full crowns for dogs. The concentration of the released metal ions was measured after the restoration of 2 weeks, 1 month, 2 months and 3 months.

Promoting hepatic growth factor in the treatment of heavy type hepatitis and severe chronic hepatitis: a multicenter clinical study.

Background: The mortality rate of heavy type hepatitis is high. No special treatment is available except general treatment. This multicenter clinical study was designed to observe the safety and efficacy of promoting hepatic growth factor (PHGF) in the treatment of heavy type hepatitis and severe chronic hepatitis.