The association of the numbers of teeth present and missing teeth with medical visit due to aspiration pneumonia in older people was analyzed using the Receipt and Health Checkup Information Database in Japan. Data of dental care claims of patients aged 65 or older diagnosed with chronic periodontitis（n＝1,662,158）or missing teeth（n＝356,662）in April 2013 were combined with those of medical care claims diagnosed with aspiration pneumonia including outpatient care, inpatient care and pharmacy. Numbers of teeth present and missing teeth were calculated using a dental formula in the claims of chronic periodontitis and missing teeth, respectively, and categorized into three groups each. Percentages of subjects treated for aspiration pneumonia in those having 20-32, 10-19 and 1-9 teeth were 0.08，0.14 and 0.25％, respectively. Percentages of subjects treated for aspiration pneumonia in those having 1-14, 15-27 and 28-32 missing teeth were 0.09, 0.18 and 0.43％, respectively. Logistic regression models using treatment of aspiration pneumonia as an outcome variable and adjusting for age and sex showed that the odds ratios for those having 10-19 teeth and 1-9 teeth（reference：20-32 teeth）were 1.20 and 1.53, respectively, showing a statistically significant difference. Logistic regression models using treatment of aspiration pneumonia as an outcome variable and adjusting for age and sex showed that the odds ratios for those having 15-27 missing teeth and 28-32 missing teeth（reference：1-14 missing teeth）were 1.67 and 3.14, respectively, showing a statistically significant difference. In conclusion, among subjects visiting dentists due to chronic periodontitis or missing teeth, older people having fewer teeth present and more missing teeth were more likely to visit medical doctors due to aspiration pneumonia.

　It is considered that trainees who undergo elderly simulation experience training, through experiencing changes in the physical conditions of the elderly, can develop psychological empathy with the elderly and learn experientially how to support elderly people. The Department of Geriatric Dentistry, Osaka Dental University has been providing dental students with an elderly simulation experience training program as pre-clinical education between the basic dental education and dental clinical training curriculums since 2001. In this study, we evaluated the factors affecting the learning effects of elderly simulation experience training by text-mining analysis of reports based on an open-ended question method, using a natural language processing package and multivariate analysis. The analyses focused on the effects of characteristics of training practitioners and the sex of trainees.

　We used 253 responses to the open-ended questions by the fourth-grade dental students of Osaka Dental University after participating in elderly simulation experience training as a pre-clinical education program before dental clinical training. Data were analyzed by a text-mining software package, KH Coder 2.00 e. Co-occurrence analysis revealed that there were differences in the understanding of the physical condition of the elderly, and in psychological empathy, between male and female trainees, as well as between training practitioners. The results revealed that, in order to improve the learning effect of elderly simulation experience training, we need to consider differences in learning between male and female trainees. Furthermore, it is also important to review and refine the experience items and contents of instructions provided by training practitioners.

　Some elderly patients who receive home-visit dental treatment do not use their newly fabricated dentures. The aim of this study was to investigate factors associated with non-use of newly fabricated dentures among elderly Japanese patients during home-visit dental treatment.

　In total, 108 patients received newly fabricated dentures in a private practice in Kumamoto prefecture from August 2012 to July 2013. The usage situation of the new dentures was recorded. Additional information obtained from medical records included age, sex, medical history, care need certification, oral state by Eichner’s classification, and experience of wearing dentures prior to the manufacture of new dentures, which were compared between the denture use and denture non-use groups after the newly fabricated dentures were divided into upper jaw（n＝88）or lower jaw（n＝83）categories. Logistic regression analysis was performed with non-use of the newly fabricated dentures as a dependent variable and age, sex, experience of wearing dentures and care need certification as independent variables.

　Overall, 7 subjects（8.0％）did not use the newly fabricated dentures in the upper jaw and 7 subjects（8.4％）did not use them in the lower jaw. Among those who did not use the newly fabricated dentures, the percentage of subjects with no denture-wearing experience was 71.4％ in the upper jaw and 85.7％ in the lower jaw groups. Logistic regression analysis showed that no experience of wearing dentures was associated with non-use of the newly fabricated dentures during home-visit dental treatment after adjusting for age, sex, experience of wearing dentures and care need certification.

　These results suggest that no experience of wearing dentures is associated with a risk of non-use of newly fabricated dentures among elderly Japanese patients during home-visit dental treatment.

　Fabricating complete dentures for some inpatients requires early completion of denture preparation. Therefore, we attempted to fabricate complete dentures more quickly than normally required using typical methods.

　After taking a preliminary impression, we fabricated a denture base and bite plate using a denture resin polymerized at room temperature and ready-made bite rim wax on plaster. Inside the patientʼs oral cavity, the patientʼs bite was registered concurrent to the extension and relining of the edge of the denture base. The dentures were adjusted during a trial insertion and were subsequently polymerized and completed after arranging the artificial teeth. The process of artificial tooth arrangement, polymerization, and completion was performed at an external laboratory. The mean fabrication time described in this report, from preliminary assessment to complete denture preparation, was 15±2.8 days, which is significantly shorter than the 35±3.7 days required using typical methods（p＜0.01）.

　The complete denture fabrication method described in this report is suitable for patients who are hospitalized for a short time or who immediately require complete dentures after developing difficulties pertaining to oral intake. Furthermore, application of this simple method could shorten the fabrication time for complete dentures and provide more options for complete denture fabrication in dental care in the future.

　Elderly bedridden patients with dysphagia have difficulty performing oral health care by themselves. Our aim was to evaluate the effectiveness of an oral hygiene method of using edible sesame oil in elderly bedridden patients with dysphagia in nursing homes.

　Using a one-group multicenter before-and-after design, our intervention focused on 13 elderly bedridden patients with dysphagia in nursing homes for a duration of two weeks. Our self-designed oral health care method involved using gauze swabs dipped in edible sesame oil for providing oral health care to the participants.

　The evaluation indexes were microbial colony counts for total bacteria, Candida spp., and Pseudomonas spp. from the participantsʼ tongue swabs, oral cavity moisture levels, subjectsʼ cheek mucosal integrity by cytodiagnosis, and assessment of participantsʼ oral health using the Sakota Oral Assessment Scale（SOAS）and the Revised Oral Assessment Guide（ROAG）.

　Post-intervention, the total microbial count decreased to －0.56±0.63 log₁₀ CFU/swab（n＝12）（p＝0.010）, and the Candida spp. count changed to －1.55±2.19 log₁₀ CFU/swab（n＝9）（p＝0.066）. Six patientsʼ assessment score improved regarding ‘Tongue’ and ‘Halitosis’, while 3 patientsʼ scores for ‘Lips’ condition, and 2 patientsʼ scores for ‘Saliva’, ‘Mucous membranes’, and ‘Gums’ showed improvement. An improvement in the subjectsʼ cheek mucosal integrity was observed in 11 patients.

　In conclusion, the results of our study suggest that using edible sesame oil for oral hygiene could be an effective way to reduce the tongue microbial load among elderly patients with dysphagia.

　Further study on the effect of this intervention when applied to a larger patient sample for a longer term is needed.

　Purpose：We observed the prevalence of aspiration pneumonia in psychiatric hospital inpatients and responded only to those patients with dysphagia.

　Objective：From 2005 to 2015, there were a total of 7,286 inpatients in the Hinaga General Center for Mental Care.

　Results：We observed that：1）40％ of inpatients were over 65 years of age, and that this rate has been steadily increasing in recent years. 2）The total number of pneumonia onset cases was 148（male to female ratio 2：1, over 65 years 75％）. The incidence of total pneumonia for the 10-year periods was about 2.0％. The number of aspiration pneumonia onset cases was 41（28％）. 3）The total number of inpatients with pneumonia was 73（average age at initial stage 70±10 years）. The number of multiple onset cases of pneumonia was 31（42％）. 4）After medical intervention for patients with dysphagia, the number of onset cases decreased.

　Conclusion：It was inferred that aspiration pneumonia was mostly diagnosed as pneumonia, and that aspiration pneumonia is an important issue to be addressed among psychiatric hospital inpatients.