Comparison of Powered versus Manual Tooth Brushing for Safety and Efficacy in Patients with Gingivitis: A Randomised, Multicentre Clinical Trial in China.

Objective: To evaluate the effects of powered and manual tooth brushing on gingival inflammation in a Chinese population with mild to moderate gingivitis.

Methods: The present randomised, single-blind, parallel clinical trial was conducted in five cities in China. Generally healthy participants aged 18 to 65 years, who were non-smokers and had at least 20 sites of gingival bleeding, were included as eligible subjects.

Trend on dental caries status and its risk indicators in children aged 12 years in China: a multilevel analysis based on the repeated national cross-sectional surveys in 2005 and 2015.

Background: This study aimed to explore the trend and risk indicators for dental caries of children aged 12 years in China based on national oral health survey data in 2005 and 2015.

Methods: Research data were from the two latest national oral health surveys conducted in mainland China, including 30 and 31 provinces, autonomous regions, and municipalities in 2005 and 2015, respectively. Children aged 12 years were clinically examined for dental caries and dental fluorosis according to the World Health Organization criteria.

Prevalence and Associated Factors of Tooth Wear in Shanghai.

Objective: To estimate the prevalence and distribution of tooth wear among groups of adolescents and adults in Shanghai, China through an epidemiological survey, and explore the associated factors.

Methods: Multistage, stratified, constant volume and cluster sampling methods were used in an epidemiological survey conducted in Shanghai in 2014. The basic erosive wear examination (BEWE) index was used to screen for tooth wear in different age groups: 12 years, 15 years, 18 to 35 years, 36 to 49 years and 50 to 74 years.

Relationship between periodontal disease and male infertility: A case-control study.

Objectives: To compare the prevalence of chronic periodontitis between men who had semen abnormalities and those who had normozoospermia through a case-control study.

Materials And Methods: Male patients who visited the assisted reproduction clinic of a large general hospital and were diagnosed with semen abnormalities were included in the case group. The control group was composed of patients of the same clinic with normozoospermia.

The 4th National Oral Health Survey in the Mainland of China: Background and Methodology.

Oral disease patterns change over time and it is important to conduct epidemiological surveillance population surveys regularly to monitor the situation. The overall objectives of the present survey were: (1) to describe the oral health status of Chinese children and adults in the 2015-2016 4th National Oral Health Survey; (2) to investigate the oral health knowledge, attitudes, and behaviours among children and adults; (3) to explore the association among sociodemographic characteristics, oral health behaviours, and the oral health status of Chinese children and adults. A national oral health survey was conducted among a representative sample of Chinese children and adults.

[A survey on knowledge, attitude and practice related to evidence-based dentistry among dental students].

Purpose: To investigate the knowledge, attitude and practice related to evidence-based dentistry among dental students, and to provide a reference for targeted evidence-based dentistry teaching and practice evidence-based dentistry in dental students.

Methods: Dental students who attended the internship in Shanghai Ninth People's Hospital and Pudong People's Hospital were invited to attend this survey. Information on knowledge, attitude and practices related evidence-based dentistry was collected through questionnaires.

[Preparation and identification of polyclonal antibody of Streptococcus salivarius 57.I urease].

Purpose: To prepare and identify polyclonal antibody of Streptococcus salivarius 57.I urease.

Methods: The biggest structural subunit of Streptococcus salivarius 57.

[Clinical study on the effect of anti-gingivitis IgY toothpaste in control of gingivitis and dental plaque].

Purpose: To observe the effect of anti-gingivitis IgY toothpaste in control of gingivitis and plaque.

Methods: The study was a double-blind, randomized, parallel-controlled clinical trail with a total of 100 subjects who were divided into two groups, experimental group and control group. The subjects in experimental group used anti-gingivitis IgY toothpaste to brush twice daily for 3 minutes, and the subjects in control group used none anti-gingivitis IgY toothpaste.

Dental erosion among children aged 3-6 years and its associated indicators.

Objectives: To analyze the status quo of dental erosion in 3- to 6-year-old children in Shanghai.

Methods: A stratified, cluster, multistage random sampling methods was applied to 3- to 6-year-old children in Shanghai in 2012. Both questionnaire and clinical oral examination were performed in the survey.

Mode of action studies on the formation of enamel minerals from a novel toothpaste containing calcium silicate and sodium phosphate salts.

Objectives: To investigate in vitro and in situ the deposition and formation of hydroxyapatite (HAP) on enamel surfaces following brushing with a novel toothpaste containing calcium silicate (CaSi), sodium phosphate salts and fluoride.

Methods: Polished enamel blocks were brushed in vitro with a slurry of the CaSi toothpaste. After one brush and four weeks simulated brushing the enamel surfaces were analysed.

A randomized trial on the inhibitory effect of chewing gum containing tea polyphenol on caries.

Objective: The purpose of the study was to determine the cariostatic potential of a chewing gum containing tea polyphenol.

Study Design: A total of 157 schoolchildren aged 8-9 years were randomly allocated into three groups. Two groups received chewing gum with or without tea polyphenol.

[Relationship between ureolytic activity expression of Streptococcus salivarius urease genes ureIABCEFGD in Escherichia coli and nickel ions].

Purpose: To obtain the clone of Streptococcus salivarius 57.I urease genes ureIABCEFGD and investigate the relationship between ureolytic activity expression of this clone in Escherichia coli and nickel ions.

Methods: The target gene was cloned by polymerase chain reaction in 2 parts separately.

[Practice and experience in early clinical education of dental students in preventive dentistry].

To help dental students acquaint the medical environment, doctor-patient communication and relationship, early clinic education was arranged in our college of stomatology. The interesting topics were chosen to enhance the learning enthusiasm of the students in the teaching practice of preventive dentistry. Students were encouraged to practice the skill of doctor-patient communication.

[Cloning and expression of Streptococcus salivarius urease gene in Escherichia coli].

Objective: To clone Streptococcus salivarius (Ss) 57. I urease gene, which can express ureolytic activity in Escherichia coli (Ec) without adding extra nickel ions.

Methods: Urease gene was cloned by polymerase chain reaction in three separate parts.

[The relationship of halitosis and Helicobacter pylori].

Purpose: The aim of the study was to investigate the relationship between halitosis and Helicobacter pylori infection in stomach.

Methods: Fifty subjects without periodontal diseases and systematic disease (exclude gastrointestinal diseases) were included. Infection of H.

[Effect of two kinds of chewing gums on dental plaque pH].

Purpose: The aim of the study was to evaluate the change of plaque pH after chewing 2 kinds of gums.

Methods: The investigation consisted of 8 healthy subjects (aged 23-27 years, 4 males and 4 females) who refrained from toothbrushing for 24 hours before the test. The pH of dental plaque was measured using a Beetrode pH microelectrode before and after sucrose challenge with a 10% sucrose solutions at 5, 10, 15, 20 minutes as the baseline data.

[The effect of chewing gum containing tea polyphenol on salivary flow rate and pH].

Purpose: To investigate the change of saliva flow rate and pH after chewing tea polyphenol gum.

Methods: Saliva was collected before and after chewing tea polyphenol gum and the control gum. Both the salivary flow rate and pH value were measured and analyzed by one-way ANOVA and SNK.