During EMG biofeedback therapy as a muscle relaxation training in masticatory muscles, an EMG activity of the muscle has been recognized with the aid of an auditory or a visual feedback procedure. A newly developed EMG biofeedback system utilizing a tactile vibration procedure was evaluated for its musde relaxation training efficacy. Eight healthy subjects (mean age of 24.3±2.4 years old) were examined for their fronta1, temporal, masseter, and sternocleidomastoid muscle EMG activities before and after a 3 consecutive day biofeedback training session. During biofeedback training, EMG activity in the frontal muscle was translated into vibration. The subject can monitor his/her EMG intensity levels in palm using a specially designed hand held apparatus. Parameters representing the autonomic nervous system involving the heart rate, and the plethysmogram were also recorded simultaneously.

By means of mean value of the rest session set at 100, EMG activity of each rnuscle was normalized for further analysis. EMG changes of frontal, tempora1, masseter and sternocleidomastoid muscles as an orofacial muscle unit decreased significantly after the biofeedback training session than before the training session(p〈0.05;repeated measure ANOVA). Although EMG levels of all the four muscles decreased after the training session, a statistical significant change was fo皿d only in the frontal muscle. Since it was admitted that the heart rate and plethysmogram were not accompanied by the decline of the muscle activities, the autonomic system could be changed little by frontal EMG biofeedback training.

Mouth odor intensities of 30 healthy female students belonging to a vocational school were measured using a portable sulfide monitor for detection of volatile sulfur compounds, which were the main contributors of oral malodor. Then, a distribution of mouth odor intensities was analyzed. And a questionnaire relating to oral malodor was answered by the same subjects.

The results were as follows.

1. Mouth odor intensities of all subjects showed a wide and irregular distribution ranging from low values to high values. Then, the over half of the subjects had strong mouth odor. The mouth odor intensities were confirmed to change with the time, because the intensities tended to increase as refraining the oral activity more longer.

2.There was a positive correlation between the tongue coating score and the mouth odor intensity.The intensities of subjects in which tongue coating adhered widely to the tongue dorsum surface were high.

3.The clinical indices except for the tongue coating score and questionnaire items on lifestyle habit were not related with the mouth odor intensity、 Based on these results, patients who make oral malodor to be a chief complaint must be diagnosed, treated, and offered health guidance. And it is important to be careful of the condition before mouth odor measurement. Furthermore, research seems to be necessary on the effects of other factors for mouth odor intensity, and on some factors which promote the adhesion of tongue coating.

Recently, a conception of biochelnical modulation, which increases the effect of anti-tumor agents, has been used for cancer chemotherapy. However, there are still few reports that the biochemical modulation was introduced into cancer chemotherapy in the oral region.Therefore, we administered radiotherapy and multi-drug chemotherapy with CDDP, 5-FU/ leucovorin (PFL) to 7 patients who had advanced cancers in the oral region as a preoperative therapy. Clinical therapeutic effects were 2 CR, 3PR and 2 NC; the responsive rate was 71.4%. The histopathological therapeutic effects were 3 G.IV, 2G.Ⅲ and 2 G.Ⅱb; the responsive rate was 100%. The fatal side effects of PFL chemotherapy with irradiation were not observed, but stomatitis accompanied with erosion or ulcers occurred in all cases. From these results, the colnbination of PFL chemotherapy and irradiation was excellent in effects as a preoperative therapy for oral cancers. However, the combination therapy made stomatitis more severe than in each single therapy. In order to decrease the side effects, we need to take care for the time schedule or the dosage of giving anti-tumor agents and irradiation.

Pathological examinations diagnosed at our department in 1999 were statistically reviewed.The number of the examinations amounted to 640 from 528 cases (Male: 224, Female: 304). And,the cases were found the most frequently in the seventh decade (110 cases).In histological classifications of the lesions (mean age±SD), odontogenic tumor consisted of 4 ameloblastomas(37.0±11.9), 3 odontomas (13.3±6.0), and one ameloblastic fibroma (6.0). The non-odontogenic benign lesions were 23 fibrous hyperplasias (52.7±19.8), 11 hyperkeratosis (leukoplakia) (62.6±10.8), 11 hemangiomas (47.2±17.5), 9 papillomas (50.2±19.8), 5 epithelial dysplasias (54.5±21.8), 5 osteomas(exostosis), 5 periapical cemental dysplasias (50.0±16.3), 4 papillary hyperplasias (64.8±12.3), 4 pleomorphic adenomas (57,0±23.8), and 3 irritation fibromas (61.0±3.6). And, non-odontogenic malignant tumor consisted of 45 squamous cell carcinomas (66.0±11.7), 2 verrucous carcinomas (71.5±9.5), one adenoid cystic Carcinoma, one mucoepidermoid carcinoma,one salivary duct carcinoma, and one rhabdomyosarcoma. The odontogenic cyst consisted of 41 radicular cysts (49.2±17.5), 11 primordial cysts(32.1±22.3), 13 dentigerous cysts (27.1±16.3). The non-odontogenic cyst consisted of 45 mucoceles (31.3±20.8), 22 postoperative maxillary cysts (54.9±13.3), and 4 incisive canal cysts (45.8±15.1). In addition,20 Sjögren syndromes (50.6±17.1), 22 lichen planus (63.0±8.4), 20 chronic localized hyperplastic gingivitis (40.5±18.7), 8 dental granulomas (34.3十11.9), and 9 osteomyelitis were revealed.

Titanium is widely used for implants in the field of dentistry because of its good mechanical strength, stability, and compatibility with bone. There have been various reports on edentulous patients being treated with oral implants to recover their masticatory and stomatognathic functions. This report describes about cases of implant treatment and questionaire concerning the evaluation of implants in Implant Center at Iwate Medical University. All osseointegrated implants regained masticatory function by wearing upperstructures. Clinically,good outcome were obtained with all cases. According to questionaire concerning food intake, all patients were able to intake all foods on the food list after oral implant treatment.