Descriptive study of dental injury incurred by junior high school and high school students during participation in school sports clubs.

Aim: Students often injure their teeth during participation in school-based sports clubs. This study examined the frequencies and types of dental injuries sustained at school sports clubs and compared the risk of dental injury among different sports.

Methods: Based on injury statistics from the Japan Sport Council of the junior high schools and high schools in seven prefectures during fiscal year 2006, the risk of dental injury was estimated using a rate ratio (RR) by calculating the ratio of occurrence of dental injury under various circumstances.

Tooth loss and risk of hip fracture: a prospective study of male Japanese dentists.

Objectives: To determine whether the number of teeth lost can predict the risk of subsequent hip fracture.

Methods: We followed up 9992 male Japanese dentists aged 50 years or more (mean age ± standard deviation [SD], 61.1 ± 9.

Comparison of clinical practice education in dental hygiene schools in eight countries.

Objectives: The profession of dental hygienist is one of the few in which the primary function of the practitioner is to prevent oral disease and to promote the well-being of patients. The aim of this study was to investigate clinical training conditions in schools of dental hygiene in eight countries (the USA, Canada, the UK, Sweden, Denmark, Thailand, South Korea and Japan).

Methods: In 2006, we sent out a questionnaire in which we asked dental hygiene schools about how they educate dental hygiene students.

Recent trends in sugar content and pH in contemporary soft drinks.

Purpose: The purpose of this study was to determine the content of sucrose, glucose, total sugar, and pH in a range of popular contemporary Japanese soft drinks and compare their changes in different periods.

Methods: The pH value and content of sucrose and glucose of popular Japanese soft drinks were determined, and this study's results were compared with the previous data of beverages in 1978, 1981, 1985, and 1997.

Results: Coffee drinks showed the highest content of sucrose, while carbonated diet drinks showed the lowest.

Remineralization of primary tooth enamel from individuals with Down syndrome.

Purpose: The purpose of this study was to clarify the characteristics of primary tooth enamel of Down syndrome patients (DSPs). We examined 9 primary teeth of Down syndrome children and 11 primary teeth of normally developed children to investigate the remineralization processes of enamel by transverse microradiography and X ray micro analyzer (XMA).

Methods: Mineral loss, lesion depth, maximum mineral value, minimum mineral value, depth of maximum mineral value, and depth of minimum mineral value were used to analyze transverse microradiography (TMR).

Impact of interocclusal contacts on infrared laser fluorescence in pits of sound first permanent molars in children.

Background: A device based on infrared laser fluorescence (IRLF) has become available as an adjunct for the diagnosis of dental caries.

Aims: The objective of this study was to clarify the differences of IRLF readings in the mesial, central and distal occlusal pits of first permanent molars.

Design: Sixty-four children (average age 8.

Quantitative evaluation of the oral biofilm-removing capacity of a dental water jet using an electron-probe microanalyzer.

Objective: This study was conducted to evaluate the oral biofilm-removing capacity of a dental water jet (DWJ) by measuring biofilm thickness using an electron-probe microanalyzer (EPMA).

Methods: Thirty consenting subjects wore in situ plaque-generating devices, which consisted of a pair of 4mm(2) enamel slabs attached to the upper molars for 2 days. Each device removed from the mouth was clamped, and one of the slab surfaces was treated with the DWJ, irrigating it for 5s.

Is there a relationship between periodontal disease and smoking after adjusting for job classification in Japanese employed males?

Objectives: The objective of this study is to examine whether the well-known association between periodontal disease and smoking persists after adjusting for job classification.

Methods: A sample of 16,110 employed Japanese males aged 20-69 years was included in the study. Periodontal examinations were conducted using the Community Periodontal Index.

[An intervention comparison of dental hygienist visits and leaflet mailing for improvement of oral health scores in village residents].

Purpose: This study was undertaken to clarify to what extentintervention by dental hygienist visits and leaflet mailing, once or three times a year, increased the dental health scores of Tobishima Village residents in a 3 year period.

Methods: The oral health status and oral health score (the Oral Salutogenic Score) of 786 residents were examined in May, 2004. Of the total, 446 people had oral health scores equal to or less than 15.

Tooth loss and intakes of nutrients and foods: a nationwide survey of Japanese dentists.

Objectives: To clarify the association of tooth loss with dietary intakes among dentists, for whom sufficient dental care is available.

Methods: We analyzed the data from 20 366 Japanese dentists (mean age +/- SD, 52.2 +/- 12.

Average daily intake of phosphorus in 3- to 5-year-old Japanese children as assessed by the duplicate-diet technique.

The present study aimed to determine whether there is excessive mean daily intake of phosphorus in 3- to 5-year-old Japanese children and to ascertain relationships between phosphorus intake and various food and beverage groups. Subjects comprised of 90 children, with 15 boys and 15 girls in each age group from 3 to 5 years. The duplicate-diet technique was used to ascertain total dietary intake, including snacks and beverages over a 24-h period on 3 separate days from summer 1999 to winter 2000.

Relationships between mandibular cortical bone measures and biochemical markers of bone turnover in elderly Japanese men and women.

Objective: The aim was to clarify the association between dental panoramic radiography measures of mandibular inferior cortical shape and biochemical markers of bone turnover in elderly men and women.

Study Design: Subjects were 80-year-old men (n = 85) and women (n = 153). Mandibular cortical shape and width were evaluated on dental panoramic radiographs.

Analysis of risk factors for dental caries in infants: a comparison between urban and rural areas.

Objectives: This study investigated the incidence of caries in infants and explored the risk factors related to noteworthy variations between urban and rural areas.

Methods: Subjects were 232 infants (111 males and 121 females) aged 1.6 and 3 years born in "N" town between the fiscal years of 1997 and 2001.

[A pilot study to develop a screening system and maltreatment index for elementary schoolchildren focusing on daily habits and dental caries].

Objective: In recent years, the number of consultations for maltreatment cases has been increasing in Japan. The characteristics of maltreated children are important factors for their identification. In an earlier paper, we analysed the daily habits related to maltreated children.

Temporal association of elevated C-reactive protein and periodontal disease in men.

Background: Most studies on the relationship between serum C-reactive protein (CRP) and periodontal disease have been cross-sectional. In this study, we investigated the temporal association between CRP and periodontal disease by following a large number of subjects for 1 year.

Methods: We studied 11,162 men in Nagoya, Japan, who had an initial dental examination as part of a complete physical examination and then underwent the same examination 1 year later.

Longitudinal Evaluation of Multi-phasic, Odontological and Nutritional Associations in Dentists (LEMONADE Study): study design and profile of nationwide cohort participants at baseline.

Background: To examine the association between oral health and general well-being, we are currently conducting a nationwide cohort study comprising members of the Japan Dental Association (JDA). Herein, we describe the study design and the profile of the participants at baseline.

Methods: From 2001 through 2006, the participants completed a baseline questionnaire that surveyed factors related to lifestyle, general health, and oral health.

Development of an oral salutogenic checklist to promote lifelong oral health in Japanese adults.

Purpose: The aim of this study was to assess the relative weights of each factor related to tooth retention identified in our previous study with an objective of developing a risk assessment tool that could be incorporated into a self-administered oral salutogenic checklist.

Materials And Methods: Oral health status and lifestyle were investigated in 777 subjects aged > or = 20 years. Eleven items that had a statistically significant odds ratio of being related to the number of retained teeth in our previous study were identified.

Iron, zinc, manganese and copper intakes in Japanese children aged 3 to 5 years.

This study aimed to measure and evaluate the intakes for the four trace elements of Fe, Zn, Mn, and Cu in 3- to 5-y-old Japanese preschool children. The study group consisted of a total of 90 3- to 5-y-old children living in Yokkaichi, Mie, Japan. Diet samples were collected by the duplicate-portion technique on 3 d at three different seasons between summer in 1999 and winter in 2000.

Calcium, magnesium, potassium and sodium intakes in Japanese children aged 3 to 5 years.

The present study aimed to evaluate in preschool children the intakes of Ca, Mg that possibly affect health and tooth formation and the intakes of K and Na that may affect lifestyle-related diseases. Information on dietary intake was collected from 90 preschool children (15 boys and 15 girls each in the 3-, 4- and 5-year old groups) on 3 separate days in the school fiscal year 1999 (April 1999 to March 2000) by the duplicate-diet technique. The Ca, Mg, K, and Na concentrations were determined by atomic absorption spectrometry using wet-ashed samples.

Effect of strontium in combination with fluoride on enamel remineralization in vitro.

Previous studies showed that strontium (Sr) as well as fluoride (F) can enhance enamel remineralization. The aim of this study was to evaluate the effects of Sr in combination with F on enamel remineralization in vitro. Sixty enamel specimens obtained from caries free human premolars were demineralised to produce caries-like lesions.

Comparison of the health condition between the 8020 achievers and the 8020 non-achievers.

Aim: To review of the difference in the health condition between 8020 achievers and 8020 non-achievers covering 25 papers which were published mainly in Japan.

Background: A campaign targeting the elderly to retain at least 20 teeth by the time they reach the age of 80 years (8020) has been in place since 1991 in Japan.

Results: The percentage of 8020 achievers increased from 10.

Site specific mineral composition and microstructure of human supra-gingival dental calculus.

Dental calculus has been implicated in the aetiology of several periodontal conditions. Its prevention and removal are therefore desirable clinical goals. While it is known that calculus is very variable in chemical composition, crystallinity and crystallite size little is known about site specific variability within a dentition and between individuals.

Tooth size variability and relevance of numerical variation in the Japanese serow.

We analysed the variability of the lower cheek teeth of the Japanese serow, Capricornis crispus, from Aichi Prefecture, Japan, based on the coefficient of variation (CV), and examined tooth size variability. The mesiodistal (MD) and buccolingual (BL) crown diameters of permanent cheek teeth were measured, and an index of the crown surface (MDxBL) was calculated. As a result, the CV for MD measurements ranged from 3.

Gradients in periodontal status in Japanese employed males.

Aim: The objective was to assess whether there was a social gradient in periodontal status by job classification in Japanese male workers.

Material And Methods: Study participants were 15,803 Japanese male workers aged 20-69 years. There were seven groups classified by jobs.

Is there a gradient by job classification in dental status in Japanese men?

The objective of this study was to assess whether there is a gradient in dental health status by job classification in male Japanese workers. The study subjects were 16,261 male Japanese workers aged 20-69 yr. Jobs were classified into seven job groups.