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.

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.

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.

Salutogenic factors that may enhance lifelong oral health in an elderly Japanese population.

Objectives: The objective of this study was to assess which factors affected the maintenance of more than 20 teeth in Japanese patients aged 80 years and older, using a life-course perspective.

Subjects And Methods: The oral examination was carried out by dentists. The questionnaire asked about family background, background during various stages of growing up, tooth brushing, snacking, job history, health examination, war experience, number of children, oral health condition and dietary preferences.

Relationship between survival rates and numbers of natural teeth in an elderly Japanese population.

Objectives: The objective of this study was to assess whether elderly people with 20 or more natural teeth were more likely to live longer than a cohort with less than 20 teeth.

Materials And Methods: Groups of elderly people over 80 years of age (24 males and 35 females) with 20 or more teeth (>or=20 group) were compared with elderly people (24 males and 35 females) with less than 20 teeth (<20 group). Follow-up studies were conducted at regular intervals for 10 years from July 1992 to July 2002.

Masticatory performance in 80-year-old individuals.

Objective: To evaluate the masticatory performance of elderly people at the age of 80 years.

Subjects: A total of 283 individuals of 80 years of age took part in a general and dental health survey.

Main Outcome Measures: A dental examination including the number of remaining teeth, occlusion, prostheses, bite force recording, and a questionnaire regarding masticatory performance were recorded.