Problems can occur with the use of the various denture cleaners that are sold for the sterilization and deodorization of dentures. Some of these cleaners may be swallowedby mistake, which can be said to be a form of "misuse". Also, the smell of deodorant maylinger in the dentures. Additionally, small amounts may remain in the dentures and besubsequently gradually absorbed into the body.
Even when it is absorbed, the deodorant will have turned to harmless water by the time it reaches the stomach and there are consequently no side effects. A type of ozonewith strong deodorization power was used for deodorization of the denture.
A total of 10 subjects (5 men and 5 women), with 15 dentures took part in this experiment.
An organoleptic score was performed three times to test the odor of the denture. First, before it was washed with ozone, and then at 5 and 10 minutes after washing.
Except for one person judged "strongly smelling" in the inspection before the ozonewashing, the deodorization results of all the subjects were "odorless" after a 5 minuteozone wash, and one subject judged "strongly smelling" also became "odorless" in after a10 minute ozone wash.
These results show that ozone is very effective for the deodorization of dentures when used for 10 minutes. It is also very useful for the health administration of elderlypeople's dentures.

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Many abutment teeth of the overdenture were infected with dental caries or periodontal disease because of the difficulty of plaque control and the poor of self-cleansing.However, a few studies have reported the prevention of these diseases. Fluoride hasbeen reported to have antibacterial ability. In addition, highly concentrated fluoride varnish can be kept around the teeth. In this study, we examined the preventive effects ofhigh concentration fluoride varnish on dental caries and periodontal disease of abutmentteeth for overdenture.
The subjects, consisting of 16 patients from 48 to 73 years of age, were allocated atrandom to a test group (6 patients, 14 teeth) or a control group (10 patients, 17 teeth).The test group' s teeth were treated by high concentration fluoride varnish (22, 600ppmF-). In this study, we examined the status of periodontal disease, dental cariesand the number of microorganisms (mutans streptococci, Lactobacilli) in the patient'ssaliva.
There were no extracted teeth in the test group.In contrast, 4 teeth in the controlgroup were extracted because of periodontitis. The CPI code and tooth mobility scoresimproved in the test group (p<0.05). However, there were no significant differencesbetween the groups in the number of microorganisms.
From these results, the regular application of fluoride varnish indicates the effectson improvement periodontal diseases

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[in Japanese]

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[in Japanese]

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[in Japanese]

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A series of rehabilitation program for recovering oral function was provided for 4 weeks at 24 institutions for dependent elderly people. Oral Health Exercise were give nfor all the institutionalized elderly people in the facilities, and for the selected 116 people with swallowing disorder, a series of functional oral rehabilitation were given everyday. The program were organized by the Association for Medical Facilities of National Health Insurance and given by care workers of the institutions and by dentists and dental hygienist of dental clinics. In those who had functional oral rehabilitation, about half showed increased level of swallowing function, 22% showed increased diet, 22% showed shortened time for food taking. Enriched facial expression and smiles, increased oral communication and increased abilities for daily living activities were also observed. The result of the assessment of functional oral rehabilitation program in this study suggests the possibility for more effective services for dependent elderly people by active commitments by dental personnel.

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