[Effect of fluoride on the viability and apoptosis of ameloblasts in vitro].

Purpose: To evaluate the effect of fluoride on viability of rat ameloblasts in vitro.

Methods: The ameloblasts of rat was exposed to different concentrations of NaF (0, 0.4, 0.

[The effect of fluoride on the metabolism of teeth and bone in rats].

Purpose: To investigate the effect of fluoride on the metabolism of teeth and bone in rats, and to probe the mechanism of pathogenesis of dental fluorosis.

Methods: A total of 48 Wistar rats were randomly and equally divided into 4 groups including control group (distilled water), low-dose group(NaF,50 mg/L), medium-dose group (NaF,100 mg/L) and high-dose group (NaF, 150 mg/L). After 8 weeks, the rats were sacrificed under anesthesia, and serums were collected.

[Investigation of dental manpower in non-public dental institutions in Liaoning province].

Purpose: To investigate the non-public oral medical institutions in Liaoning province in 2011, and to analyze the status of dental manpower in non-public dental institutions in Liaoning province.

Methods: A mass survey on dental manpower was made in non-public dental institutions in Liaoning province in 2011 by means of questionnaire investigation, which included the institution type, dental devices, and the number, structure, composition, distribution of dental manpower in non-public dental institutions in Liaoning province. Data was entered with EpiData 3.

Distribution of enteroviruses in hospitalized children with hand, foot and mouth disease and relationship between pathogens and nervous system complications.

Background: To explore the relationship between enteroviruses and hospitalized children with hand, foot and mouth disease (HFMD) complicated with nervous system disease. 234 hospitalized HFMD patients treated in Shengjing Hospital, Liaoning Province were analyzed retrospectively. Based on the presence and severity of nervous system disease, the patients were grouped as follows: general patients, severely ill patients, critically ill patients and fatal patients.

[Investigation of the medical institutions of stomatology and dental manpower distribution in Liaoning province].

Purpose: The aim of this investigation was to determine and analyze the distribution of the medical institutions of stomatology and dental manpower in Liaoning province.

Methods: The data of institutions and manpower was collected by mass examination using tables filled by every institution and personally. Epidata 3.

[The investigation of dental caries among elderly people in northeast of China].

Objective: To study the dental caries status of the 65-74 years old people in northeast of China, analyze the distribution of caries in the group of people, and provide scientific basis for establishing the oral health care policies.

Methods: The representative samples were selected by multi-stage, stratified and random sampling from the three province of northeast of China. Dental caries of 2 364 people aged 65-74 were recorded according to WHO criteria.

[A sampled investigation on tooth loss of middle-aged and elders in Northeast China].

Purpose: To investigate the current status and the distribution of tooth loss in middle-aged people and elders in Northeast China, and provide scientific basis for the establishment of oral health care policies.

Methods: An equal-sized stratified multi-stage random sampling design was applied according to the third national oral health investigation of epidemiology, tooth loss was examined among 4752 people aged 35-44 and 65-74 in northeast China. The data were analyzed with SPSS13.

[Oral health survey of elder people in northeast of China].

Purpose: To assess the oral health status of the 65-74 years old people in the northeast of China, analyze the distribution of caries and periodontal diseases in this group of people, and provide scientific basis for establishing oral health care policies.

Methods: The representative samples were selected by multi-stage, stratified and random sampling from the three provinces of northeast of China. The diagnostic standard of dental caries and periodontal diseases were based on WHO criteria.

[Analysis of the first permanent molar caries epidemiological investigation in area of northeast China].

Objective: To survey the tooth decay of the first molars among the people in area of northeast China in order to provide the foundation for prevention and treatment strategies of caries.

Methods: According to the third national oral health investigation of epidemiology, the dental caries of first permanent molars were examined among 9394 people aged 5, 12, 35-44 and 65-74 in northeast China. The data were analyzed by SPSS 13.

[Difference between dental caries and oral health behavior of family in primary dentition].

Objective: To study the dental caries status in the primary dentition of 5-year-old children and analyze the difference of oral health behavior of family between urban and rural in Liaoning province.

Methods: The representative samples were selected by multi-stage, stratified and random sampling from Liaoning province. Dental caries of 792 children at five years were recorded according to World Health Organization criteria.

[Study on tooth loss and prosthetic condition of middle-aged and elders in Liaoning province].

Objective: To study the status of teeth loss and their restorations of the middle-aged and elders in Liaoning province.

Methods: Investigated the tooth losing and their restoration of middle-aged (35-44 years old) and elders (65-74 years old) according the method of the third national epidemiological investigation of oral health. The data was statistically analyzed by SPSS 11.

[The prevalence of dental caries in primary dentition and the risk factors of 5-year-old children in Northeast of China].

Purpose: To study the prevalence of dental caries in primary dentition of 5-year-old children in Northeast of China, and assess the risk factors for dental caries.

Methods: The representative samples were selected by multi-stage, stratified and random sampling from the three provinces of Northeast of China. Dental caries of 2353 children at five-year age were recorded according to WHO criteria.

[The prevalence and trends of caries in Liaoning province].

Purpose: The aim of this investigation was to analyse the dental caries prevalence, patterns and trends of all age groups in Liaoning province.

Methods: The representative samples were selected by multi-stage, stratified and random sampling, which included subjects aged 5,12,35-44 and 65-74 years. Clinical examination was based on WHO methodology(4th Ed).

[The epidemiological investigation of dental caries among 5-year old children in Liaoning province].

Purpose: To investigate the oral health status and its influential factors among pre-school children in Liaoning province, and to provide first hand data for prevention of caries.

Methods: According to the Third National Oral Health Investigation criteria, the oral status of 792 children aged 5 years old in 6 regions of Liaoning province were examined. SPSS 13.

[Effect of Chelerythrine on glucosyltransferase and water-insoluble glucan of Streptococcus mutans].

Purpose: To study the effect of Chelerythrine on glucosyltransferase and extra-cellular synthesis of water-insoluble glucan of Streptococcus mutans.

Methods: The Chelerythrine was used as the experimental group with concentrations ranging from 24.4microg/ml to 390.

[An epidemiological investigation of deciduous dental caries among 5375 preschool children aged between 3 to 6 years in Shenyang City].

Purpose: To investigate the status of dental caries of deciduous teeth among preschool children in Shenyang city.

Methods: According to the criteria recommended by the World Health Organization and The Second National Oral Health Investigation, the deciduous caries of 5375 preschool children aged from 3 to 6 years were clinically examined. The mean dmft and the prevalence of dental caries for each age group were calculated.

[Effect of Chelerythrine on cell surface hydrophobicity and adherence of Streptococcus mutans].

Purpose: To detect the effect of Chelidonium majus L. extractive Chelerythrine on the cell surface hydrophobicity and adherence of Streptococcus mutans, and to investigate the mechanism of adherence.

Methods: The Chelerythrine was doubly diluted to different concentration from 24.

[Experimental study of the inhibitory effects of Chelidonium majus L. extractive on Streptococcus mutans in vitro].

Purpose: To study the inhibitory effects of Chelidonium majus L. extractive on the growth of Streptococcus mutans in vitro, and to explore its mechanism in caries prevention.

Methods: Streptococcus mutans 25175 was chosen as the experimental bacterium.

[Study of caries polarization in 2-5 year-old children of Shenyang, China].

Objective: To investigate dental caries polarization in 2-5 year-old children.

Methods: 3 799 random samples of 2-5 year-old children from attending kindergarten in Shenyang were selected. Means of dmft index and SiC index for each age group were calculated by WHO Collaborating Center.

[An analysis of the state of teeth of 961 elderly cadres in Shenyang City].

Objective: To assess the current state of teeth in elderly cadres in Shenyang City.

Methods: According to the standards of the 2nd national oral health sampling survey, 961 elderly cadres, above 60 years old, were examined. The results were processed using SPSS.

[An epidemiological survey on fusion of deciduous teeth of 4286 kindergarten children in Shenyang city].

Objective: To clarify the occurrence and distribution of the fusion of deciduous teeth in Shenyang.

Methods: By using cross-sectional study, 4286 children were examined, who aged from 2 to 6 years in 37 kindergartens.

Results: Of 4286 children investigated, fusion of the deciduous teeth were detected in 65 children (1.

[An analysis of the effect of adult tooth-brushing].

Objective: This study observed plaque distribution on permanent dentition before and after brushing to analyze the effect of adult tooth-brushing.

Methods: 81 undergraduate were included in this study. Recorded the time of tooth-brushing, stained with disclosing tablets, plaque deposits on all permanent teeth were recorded using plaque index (PLI) before and after tooth-brushing.