Materials and methods: The flowers of Lonicera dasystyla were collected at the suburbs of Ha Noi city. The total flavonoid extract of the flowers was chromatographed to obtain the fraction F1KN, which was submitted to the examination for the stimulatory effect on the blast transformation of human lymphocytes. Results: At the dose of 30 mcg/ml in PBS, F1KN was proved to have a good effect. After 72h in vitro culture, the 30 mcg/ml dose increased the potential transformation of human lymphocytes by about 7 times compared with the control samples (1600 versus 230 pulses/min, respectively), while in the same condition, phytohemagglutinin (PHA) at the dose of 10 mcg/ml, increased the redioactivity by about 13000 pulses/min.
Materials and methods

No abstract available.
Biocompatible Materials*

OBJECTIVETo survey and compare the thickness-change of different thickness thermoplastic materials under different test condition and make sure the relationship between the thickness-change and the material initial thickness in order to provide a guide in selecting the suitable thickness thermoplastic in practice.

METHODSTo choose Biolon, the thickness include 1.0 mm, 0.75 mm, 0.5 mm. Used Electron Vernier caliper to measure the thickness-change of different thickness thermoplastic materials under different processing mode. The data was analyzed by SPSS 10.0.

RESULTSAfter thermoforming the thickness of thermoplastic became thinner, the thickness of Biolon 0.75 mm decreased by 0.14 mm, Biolon 1.0 mm decreased by 0.22 mm and Biolon 0.5 mm decreased by 0.14 mm. After saliva immersion the thickness became thicker. The thickness of Biolon 0.75 mm increased by 0.02 mm, Biolon 1.0 mm increased by 0.03 mm and Biolon 0.5 mm increased by 0.02 mm.

CONCLUSION1)The influence of different processing mode to the thickness-change had relation to the material initial thickness. 2)The Biolon 0.75 mm had certain superiority in thickness stability compared to the homogeneous brand through the above research.

The wide use of chairside CAD/CAM restorations has increased the diversity of the restorative material. For the practitioner, the selection of the appropriate material is difficult amongst the variety offered by the market. Information on the characteristics of the products can be difficult to assess due to the lack of up-to-date classification and the lack of reliability of manufacturer's advertising. The purpose of this article is to structure the data on restorative materials provided by various sources in order for the practitioner to choose the product most suited to the clinical situation. The objective is to classify chairside CAD/CAM materials and to define their characteristics and indications.
Biocompatible Materials* ; Ceramics ; Classification

Dental Impression Materials ; Disinfection

Polylactide and its copolymers are a kind of biomedical material andhave been approved by U.S. Food and Drug Administration. This paper briefly introduces its applications in surgical suture, orthopedics, plastic surgery, ophthalmology and other medical device fields, and also analyzes its development in our country.
Biocompatible Materials ; Polyesters

The purpose of this study is to develope new dental color-space system. Twelve kinds of dental composites and one kind of dental porcelain were used in this study. Disk samples (15 mm in diameter, 4 mm in thickness) of used materials were made and sample's CIE L*a*b* value was measured by Spectrocolorimeter (MiniScan XE plus, Model 4000S, diffuse/8degrees viewing mode, 14.3 mm Port diameters, Hunter Lab. USA). The range of measured color distribution was analyzed. All the data were applied in the form of T### which is expression unit in CNU Cons Dental Color Chart. The value of L* lies between 80.40 and 52.70. The value of a* are between 10.60 and 3.60 and b* are between 28.40 and 2.21. The average value of L* is 67.40, and median value is 67.30. The value of a* are 2.89 and 2.91 respectively. And for the b*, 14.30 and 13.90 were obtained. The data were converted to T### that is the unit count system in CNU-Cons Dental Color Chart. The value of L* is converted in the first digit of the numbering system. Each unit is 2.0 measured values. The second digit is the value of a* and is converted new number by 1.0 measured value. For the third digit b* is replaced and it is 2.0 measured unit apart. T555 was set to the value of L* ranging from 66.0 to 68.0, value of a* ranging from 3 to 4 and b* value ranging from 14 to 16.
Dental Materials* ; Dental Porcelain

GMP requires that all procedures should be properly validated...To ensure that processes and procedures remain capable of achieving the intended results, they should routinely undergo critical approvals. To obtain this purpose, the retrospective validation is proceeded with data provided from at least 10 batches. According to a C. Estampe study, we carried out a retrospective validation with Oroken 200mg tablets produced at the Saint Genis-Laval factory of Rh«ne-Poulenc Rorer (French).
Manufactured Materials ; Tablets

September 27th 2000, Vice Minister of Health Lª V¨n TruyÒn have been signed the circular letter about "guiding the registration of manufactured products in the form of drug foodstuffs"
Pharmaceutical Preparations ; Manufactured Materials

The methods used descriptive epidemiology, investigation of working environment, clinical examination, chest X-ray, and examination of respiratory function and silicosis. The target groups are 1204 workers producing constructional materials. The finding indicated that the dust concentration with free silic is higher than that of maximum acceptance. The prevalence of silicosis is 7.8% with the categories from 1/0p to 2/1q. There are also 77 cases which suspected to be suffered of category 0/1p (6.4% of 1204 studied workers). Base on the above data it is recommended that the designing, installation of exhausting apparatus at the workplace and use of individual protecting equipment (mask...) are necessary and most effective in silicosis prevention
Silicosis ; Manufactured Materials