PURPOSE: The aim of this study is to examine the effect Klorhex and Fittydent, which are used as cleaning agents on the adhesion of Candida on the surfaces of acrylic denture and palatal mucosa. In addition, ability of yeasts to adhere to acrylic strips was evaluated after applying these agents in vitro. MATERIALS and METHODS: Each group of 15 patients cleaned their dentures with either Klorhex or with Fittydent. The control group cleaned their dentures with water. RESULTS: It was found that 62.2% of the patients had colonies of Candida species on their palatal mucosa which was reduced to 51.1% after using these cleaning agents. The colonization rate with Candida spp on their dentures was reduces from 82.2% to 68.8% using these cleaning agents. The mean adhesion value of the Candida strains isolated from the acrylic strips were found to be 75cell/strip prior to applying the Klorhex and Fittydent and 37.5cell/strip and 15cell/strip after applying these agents, respectively. CONCLUSION: These results showed that Klorhex and Fittydent have a certain preventive effect on the colonization rate of Candida spp on the surface of these dentures, the palatal mucosa, as well as on the acrylic strips in vitro.
*Acrylates ; Adhesiveness/drug effects ; Antifungal Agents/*pharmacology ; Candida/*cytology/*drug effects ; Cell Adhesion/drug effects ; Denture Cleansers/*pharmacology ; *Dentures ; Mouth Mucosa/drug effects/microbiology ; Polyvinyls/pharmacology

Biocompatibility has always been the focal point in the study of biomaterials applied to medical apparatus. But at present, the standard system hasn't formed completely to evaluate the biomaterials. In recent years scientists tend to use general standard of evaluation. In this article, based on the recalcification time, the adhesion of platelets as well as the total quantity of plasma protein and some other evidences, combining with the Analytic hierarchy process (AHP), the method of general evaluation on the biocompatibility of anticoagulant biomaterials was discussed.
Anticoagulants ; analysis ; Biocompatible Materials ; standards ; Blood Proteins ; analysis ; Humans ; Materials Testing ; methods ; standards ; Platelet Adhesiveness ; drug effects

OBJECTIVETo observe the effects of multi-walled carbon nano-onions (MWCNOs) on platelet adhesion and experimental thrombosis in rats.

METHODSExperimental rats were randomly divided into sham operation group, solvent group, and MWCNO group, each including 6 ∼ 9 rats. An inverted fluorescence microscope and a flow chamber were used to observe the effects of 20 g/ml MWCNOs on platelet adhesion at shear rates of 500 s(-1) and 1000 s(-1); the experiment was repeated at least three times in each group. A rat model of carotid artery thrombosis was induced by 25% FeCl3, and the effects of 2 mg/kg MWCNOs on the blood flow and wet weight of thrombus per millimeter in the model were observed.

RESULTSWhen the shear rate was 500 s(-1), the MWCNO group showed a significantly smaller number of adhering platelets than the solvent group (58.3 ± 16.1 platelets/0.01 mm(2) vs 190.1 ± 36.0 platelets/0.01 mm(2)), but the inhibitory effect of MWCNOs on platelet adhesion disappeared as the shear rate increased to 1000 s(-1). The wet weights of thrombus per millimeter at 0 h after injection of a solvent or MWCNOs via the caudal vein were 0.83 ± 0.12 mg/mm in the solvent group and 0.97 ± 0.11 mg/mm in the MWCNO group, and the wet weights of thrombus per millimeter at 12 h after injection were 0.89 ± 0.12 mg/mm in the solvent group and 1.01 ± 0.15 mg/mm in the MWCNO group, exhibiting no significant differences between the two groups (P > 0.05). There were also no significant differences between the two groups in terms of blood flow at 0 h and 12 h after injection (P > 0.05).

CONCLUSIONMWCNOs have inhibitory effect on platelet adhesion in vitro, but the injection of MWCNOs via the caudal vein has no effects on the blood flow and wet weight of thrombus per millimeter in experimental thrombosis in rats.

Animals ; Blood Platelets ; drug effects ; Male ; Nanotubes, Carbon ; adverse effects ; Platelet Adhesiveness ; drug effects ; Rats ; Rats, Sprague-Dawley ; Thrombosis ; chemically induced ; pathology

OBJECTIVETo investigate the effect of Changtong oral liquid (CTOL) on the proliferation of cultured fibroblasts derived from normal peritoneum (NFs) and adhesive peritoneum (AFs) of rats.

METHODSTwenty male SD rats were randomized into 4 groups, including a normal serum group and 3 CTOL groups with CTOL treatment at low, medium or high doses. Serum samples were obtained from the abdominal arteries of the rats after oral treatment with CTOL for 7 days. The fibroblasts were isolated from the peritoneum by means of tissue culture, and the passage 3-8 cells were cultured with the sera of the normal control and CTOL groups for 24, 48, 72 and 96 h. MTT assay was used to observe the proliferation of the fibroblasts.

RESULTSThe dose of CTOL was inversely correlated to the absorbance but positively to the growth inhibition rates. Compared with the NFs cultured in normal control rat serum, the NFs in serum from CTOL groups showed no obviously changes in the absorbance at 24 and 48 h, but displayed significant reduction at 72 and 96 h (P<0.01). Compared with the AFs in normal rat serum, the AFs in the 3 CTOL groups all showed significantly decreased absorbance at 24, 48, 72 and 96 h (P<0.05). At the same time point, the inhibition rate of AFs in low-dose CTOL group showed no significant difference from that in the normal control group, but CTOL at a medium dose resulted in a significantly higher inhibition rate of AFs at 72 h (P<0.05). High-dose CTOL produced significant differences in the inhibition rates of AFs and NFs (P<0.05).

CONCLUSIONCTOL can inhibit the proliferation of AFs and NFs in vitro. AFs appear to be more sensitive to CTOL, which has a dose-dependent inhibitory effect of AF proliferation.

Adhesiveness ; Administration, Oral ; Animals ; Cell Proliferation ; drug effects ; Dose-Response Relationship, Drug ; Drugs, Chinese Herbal ; administration & dosage ; pharmacology ; Fibroblasts ; cytology ; drug effects ; Male ; Peritoneum ; cytology ; Rats

Nano-TiO2 thin films were prepared by Radio frequency (RF) sputtering on pyrolytic carbon substrates. The influences of sputtering power on the structure and the surface morphology of TiO2 thin films were investigated by X-ray diffraction (XRD), and by scanning electron microscopy (SEM). The results show that the TiO2 films change to anatase through the optimum of sputtering power. The mean diameter of nano-particle is about 30 nm. The anti-coagulant property of TiO2 thin films was observed through platelet adhesion in vitro. The result of experiment reveals the amount of thrombus on the TiO2 thin films being much less than that on the pyrolytic carbon. It also indicates that the RF sputtering Nano-sized TiO2 thin films will be a new kind of promising materials applied to artificial heart valve and endovascular stent.
Anticoagulants ; Biocompatible Materials ; chemistry ; Blood Platelets ; drug effects ; Humans ; Membranes, Artificial ; Metal Nanoparticles ; chemistry ; Platelet Adhesiveness ; drug effects ; Radio Waves ; Titanium ; chemistry ; pharmacology ; X-Ray Diffraction ; methods

The stability of hemocompatibility of Ti6Al4V alloy and DLC film/Ti6Al4V gradient material has been studied. The platelet consumption ratio of Ti6Al4V alloy to DLC film/Ti6Al4V gradient material has been measured respectively by digital image analysis method. It has been found that the platelet consumption ratio of Ti6Al4V alloy increased remarkedly about 50% after 2,000 m sliding tribological test under the lubrication of Hank's solution, while that of DLC film/Ti6Al4V gradient material almost didn't increase under the same condition, which means that the DLC film/Ti6Al4V gradient material has better stability of hemocompatibility.
Biocompatible Materials ; chemistry ; Blood Coagulation ; drug effects ; Diamond ; chemistry ; Humans ; Image Processing, Computer-Assisted ; In Vitro Techniques ; Materials Testing ; Membranes, Artificial ; Platelet Adhesiveness ; drug effects ; Surface Properties ; Titanium ; chemistry

To identify the advantages of modification treated poly (D, L-lactic and glycolic acid) with poly (ethylene glycol) (PLGA/mPEG, PELGA) block copolymer, blood compatibility was evaluated in vitro. Three different proportional block copolymers (LA/GA80: 20, 70: 30, 50: 50) with 15% mPEG were synthesized. According to the international standard organization (ISO10993) and National Standards of P. R. China GB/T 16886, siliconized glass tube was used as a negative control sample, while non-siliconized glass tube as a positive one. Blood compatibility of PELGA was evaluated by hemolytic ratio analysis, platelet adhesion investigation, dynamic clotting time, plasma recalcification time (PRT) measurements, plasma prothrombin time (PT) and clotting time (CT) test. The results revealed that blood compatibility of the synthesized materials was good. Nanoparticles made by this kind of materials might be promising for intravenous use.
Biocompatible Materials ; chemistry ; Drug Carriers ; chemistry ; Drug Delivery Systems ; Lactic Acid ; chemistry ; Materials Testing ; Platelet Adhesiveness ; drug effects ; Polyethylene Glycols ; chemistry ; Polyglycolic Acid ; chemistry

AIMTo evaluate how solution viscosity affects the precorneal residence of five water-soluble polymers with different properties.

METHODSCaptive bubble technique was used, with the consecutive change of contact angle interpreted as an indication of desorption process, to study the residence of those polymers in vitro on freshly enucleated rabbit eyes under physiological conditions.

RESULTSCarbopol and sodium hyaluronate (HA), which adsorbed to isolated ocular surface more than 15 min, showed the optimum precorneal retentive capabilities. When the solution viscosity increased from 12 mPa.s to 50 mPa.s, the residence time of carbopol and HA were prolonged 10 min and 7 min, respectively, but that of sodium carboxymethylcellulose was not affected.

CONCLUSIONThe result suggested that higher viscosity is beneficial to improve the ocular residence time of bio-adhesive polymers.

Acrylic Resins ; Adhesiveness ; Animals ; Cornea ; drug effects ; metabolism ; Delayed-Action Preparations ; Drug Carriers ; Female ; Hyaluronic Acid ; pharmacokinetics ; pharmacology ; In Vitro Techniques ; Male ; Polyvinyls ; pharmacokinetics ; pharmacology ; Rabbits ; Solutions ; Viscosity

The blood compatibility of block copolymer membranes of poly(benzyl L-glutamate)/poly(ethylene glycol) and the effect of on the blood compatibility of copolymer were evaluated by the clotting time test, the platelet adhesion and deformation test, and the protein adsorption test. The results showed that in terms of blood compatibility, homopolymer was better than glass and silicone, copolymer was better than homopolymer, and the more the PEG in the copolymer, the better the blood compatibility.
Biocompatible Materials ; Drug Carriers ; Materials Testing ; Platelet Adhesiveness ; drug effects ; Polyethylene Glycols ; chemical synthesis ; chemistry ; Polyglutamic Acid ; analogs & derivatives ; chemical synthesis ; chemistry ; Polymers ; chemical synthesis ; chemistry

The correlations between surface energy parameters and carbon phase components in six diamond like carbon film (DLC) samples made in different ways and processing conditions were further investigated using the analysis of T-type correlation degree in the Grey system theory based on our earlier studies such as the determination of carbon phase and surface energy parameters, the analyses of carbon phase components, surface energy parameters and adhesive characteristic of platelets for DLC. The results showed: (1) as a whole critical surface tension has the closest relation with carbon phase components, chromatic dispersion branch of surface tension takes the second place, but for the other four parameters, the correlation is weak; (2) DLC phase has larger negative correlation (degrees -0.57, -0.33) with critical surface tension and chromatic dispersion branch of surface tension, while its correlation degrees with the other four parameters related to polarity are all positive values smaller than 0.20; (3) C-H phase and C-O phase have larger positive correlation (degrees 0.48, 0.25) with critical surface tension. We have come to three conclusions (1) DLC phase plays a dominant part in hemocompatibilioty of DLC by powerfully decreasing humidification and limitedly increasing polarity; (2) the energy mechanism of platelet deformation enhanced by C-H phase and C-O phase involves increasing the critical surface tension of DLC; (3) the hemocompatibility of DLC can be evaluated by using the critical surface tension as index and using the content of DLC phase and additional content limitation of C-H phase and C-O phase as standard. This study has provided a theoretical basis for evaluating the hemocompatibility of DLC based on surface properties.
Biocompatible Materials ; chemistry ; Carbon ; chemistry ; Diamond ; chemistry ; Humans ; Male ; Materials Testing ; Membranes, Artificial ; Models, Biological ; Platelet Adhesiveness ; drug effects ; Surface Properties