Previous studies conducted by our group confirmed that the electrochemical telomerase assay （ECTA） is sufficiently sensitive to detect oral cancer from the cells obtained by exfoliation from the whole oral cavity. In this study to develop a self-screening system for oral cancer using this method, we examined the optimal method for self-collection of exfoliated cells from the whole oral cavity.
First, an interdental brush, a conventional silicone brush for the cervix, a newly developed silicone brush for the oral cavity, a sponge brush used in our previous studies, and a gargle were tested for exfoliation from the oral cavity in ten healthy volunteers. Cells exfoliated from the oral cavity were collected by a single examiner, to prevent inter-examiner variation.
Then, exfoliated cells were collected from the same ten healthy volunteers by the same manner and stained using papanicolaou.
Finally, to mimic self-examination for oral cancer, another ten healthy volunteers were instructed on how to perform a specially-made protocol for collecting exfoliated cells from their oral cavity with a sponge brush, which had been evaluated in the initial study as the most efficient method. All subjects collected a sufficient number of cells comparable to conventional methods of exfoliative cytology.
In conclusion, the self-screening system for detecting oral cancer using ECTA with the cell collection protocol described herein could be promising.

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The purpose of this study was to evaluate the partially edentulous arch and occlusal contact area in new patients aged ≥ 80 years on initial consultation. The subjects were new patients, aged ≥ 80 years, who consulted our dental clinic between January 7, 2008 and December 28, 2015.
The following results were obtained: 1）The number of new patients was 262, and the male-to-female ratio was 1：1.8. There was a slight increase in the number of new patients aged ≥ 80 years. 2）The mean number of residual teeth was 11.1. Patients with ≥ 20 residual teeth accounted for > 20％. 3）According to Eichner’s classification, the grade was evaluated as C in 131 patients （50.0％）, B in 92 （35.1％）, and A in 39 （14.9％）. 4）The most common diagnosis of chief complaint was denture incompatibility/fracture （38.2％）, followed by periodontitis （14.1％）. 5）The number of subjects who had continuously visited our hospital was 195 （65.6％）, and the mean number of extracted teeth per person was 0.9. 6）In patients who had continuously visited our dental clinic, there was a decrease in the number of grade B4 patients after the completion of treatment, and there was an increase in the number of grade C3 patients （p < 0.01）.

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Odontoma is a relatively common disease among odontogenic tumors. Odontoma is classified into compound odontoma and complex odontoma, and is often accidentally detected by X-ray examination for delayed eruption of teeth in the first and second decades of life. We report a case of compound odontoma with a maximum diameter of over 30mm spreading into the maxillary sinus. A 3-year-old boy was referred for detailed examination of a radiopaque lesion in the left maxilla. Painless swelling of the maxillary left deciduous molar region was found at the first visit, and CT examination revealed numerous tooth-like high-density structures within the left maxillary sinus （CT number 2000 to 2680HU）. A diagnosis of compound odontoma was made, and tumor resection was performed under general anesthesia. In a literature review we found 16 cases of Japanese patients with an odontoma having a maximum diameter of over 30mm spreading into the maxillary sinus. Of those, 15 cases were complex odontoma and one case was a compound odontoma （our case）. These findings suggest that the present case is rare because a relatively large compound odontoma spread into the maxillary sinus.

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Habitual luxation of the temporomandibular joint is often seen in elderly patients with dementia, cerebrovascular and neurological diseases. Even if it is difficult to manage with conservative treatment, surgical treatment under general anesthesia is often avoided because of underlying diseases, ADL, concern for postoperative delirium and postoperative cognitive dysfunction （POCD）.
The purpose of this study was to evaluate the efficiency of eminectomy under local anesthesia and intravenous conscious sedation in patients with habitual luxation of the temporomandibular joint, who suffered dementia, neurological and cerebral diseases, in addition to a literature review of the effects of this method on POCD and changes in ADL before and after surgery.

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Tobacco smoking is a worldwide public health problem. Recently, there has been growing interest in smoking cessation. On the other hand, oral mucosal ulcers are common presentations encountered in daily practice. These ulcers may be caused by various etiologies.
We report a case of refractory oral mucosal ulcer caused by improper use of nicotine gum. A male in his 50s presented to our department with an intractable ulcer in the oral floor existing for over 3 months. He had smoked 20 cigarettes per day for 25 years. He had given up smoking and been using nicotine gum for 6 months. He used two pieces of nicotine gum （2mg tablet） per day, and the gum was improperly placed at the oral floor for 3 to 4 hours per piece. An excisional biopsy was performed and revealed a mucosal ulcer without atypical cells. He was instructed to stop using nicotine gum at the first visit to our department, and the ulcer healed completely in 4 weeks.

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A retromolar canal is a branch of a mandibular canal and is rarely detected in the usual radiographic examination. We experienced a case in which damage to the nerve was avoided by having identified the retromolar canal on the image at the time of tooth extraction of the left lower third molar. The patient was a male in his twenties. Although he had consulted a nearby dental clinic for dental care of the molar of the left lower jaw, he was referred to our hospital. In a panoramic X-ray at the first examination, the retromolar canal diverged from the mandibular canal and was located above the lower third molar. Computed tomography imaging findings showed that the retromolar canal was in the cancellous bone buccal to the lower left third molar and the diameter was 3.5mm. For extraction of the left lower third molar, the lingual split technique was selected to avoid damage to the retromolar canal.

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