Biomedical subjects

S Hatate

Publications and source records attributed to S Hatate.

17 recordsLinked to original sources

PubMed1990

[Clinical evaluation of protocol for the craniomandibular disorders. 2. Craniomandibular disorders according to new classification].

The purpose of this study is to clarify the actual state in the patients with extensive pathological states of craniomandibular disorders (CMDs). 100 patients, with their ages ranging from 11 to 77 years old, were selected for the study and they were divided into 5 groups according to classification of Japanese Society for Temporomandibular Joint. The following results were obtained: 1. By classification type, the ratio was 88, 16, 8 and 2% for Type III, Type I, Type IV and Type II. Type V was not found. 2. 22% of patients were male and 78% were female. The ratio of male and female was 1:4. 3. By age group, the ratio was 34, 23, 18, 12, 11, 1 and 1% for twenties, tens, thirties, fifties, forties, sixties and seventies. CMDs was found highly in younger ages (tens and twenties). 4. The ratio diagnosed Type III was 86.9, 97.0, 88.8 and 83.3% for tens, twenties, thirties and forties. Type III was found high ratio in all ages. 5. In all patients, right TMJ with disorder 37%, left TMJ with disorder 34%, bilateral TMJ with disorder 29%. There were no difference between right and left. 6. As can be seen from the above, young individuals with CMDs were clearly high ratio and many CMDs were diagnosed Type III through all the ages. Therefore, the results of our study suggest that young CMDs patients could be increasing gradually and complicating a pathological state.

Adolescent↗

PubMed1990

[Clinical evaluation of protocol for the craniomandibular disorders. 3. Questionnaire for the craniomandibular disorders].

The purpose of this study is to clarify the effectiveness of questionnaire which is included in the protocol designed for screening the patients with extensive pathological states of craniomandibular disorders. 100 patients, with their ages ranging from 11 to 77 years old, were selected for the study and they were classified under various disorder classification which is based on the criteria of Japanese society for Temporomandibular Joint. Statistical analysis was performed to find the relationship between the different pathological states and the results of the questionnaire. The following results were obtained: 1. The ratio of appearance on TMJ pain was as follows: Type I (100%), Type II (0%), Type III (43.8-75.0%) and Type IV (75.0%). 2. The ratio of appearance on TMJ pain on chewing was as follows: Type I (50.0%), Type II (100%), Type III (20.0-100%) and type IV (37.5%). 3. The ratio of appearance on TMJ pain on maximum opening was as follows: Type I (100%), Type II (100%), Type III (50.0-100%) and Type IV (75.0%). 4. The ratio of appearance on TMJ noise was as follows: Type I (0%), Type II (0%), Type III (40.9-81.3%) and Type IV (50.0%). 5. The ratio of appearance on the fatigue by mastication was as follows: Type I (0%), Type II (50.0%), Type III (40.0-100%) and Type IV (75.0%). 6. The ratio of appearance on bruxism was as follows: Type I (0%), Type II (0%), Type III (10.4-40.0%) and Type IV (25.0%). 7. The ratio of appearance on the stiff of jaw on awakening was as follows: Type I (50.0%), Type II (0%), Type III (20.8-70.0%) and Type IV (37.5%). 8. The ratio of appearance on the unilateral chewing was as follows: Type I (50.0%), Type II (0%), Type III (20.0-50.0%) and Type IV (62.5%). 9. There were significances among those types about each items on the questionnaire, it can be suggested that the questionnaire for screening about craniomandibular disorders was effective.

Adolescent↗

PubMed1990

[Clinical Evaluation of protocol for the craniomandibular disorders. 1. Protocol of our department].

Craniomandibular disorders are conditions encompassing various types of dysfunction of the stomatognathic system. To define the very nature of morbidity, both differential and pathological diagnosis are absolutely necessary. At present, each medical institution in this country has its own protocol for evaluating and treating craniomandibular disorders. This makes it difficult to exchange and compare data between institutions. In this paper, a protocol worked out by our department after a series of clinical tests and study is presented, and its merits and unresolved problems are discussed.

Clinical Protocols↗

PubMed1989

[Clinical studies on rotation and translation of mandibular head in internal derangements of the temporomandibular joint with dual axis graph].

The present study was aimed at establishing the standards for functional diagnosis of the internally deranged TMJ by analyzing the rotary and gliding movements of the mandibular head. The subjects were patients with anterior displacement of the articular disc (ADD) and normal persons. The rotary movements were examined by use of a simplified condylar movement recorder and a specially developed dual axis graphic system. The findings are as follows: 1. In the patients and the normal persons as well, the rotary movements near the intercuspal contact position (ICP) showed a tendency to increase anteriorly until the mandibular head moved up to 6 mm from the ICP. However, in both patients with ADD with reduction and without reduction, the rotary movements near the ICP were significantly large as compared with those in the normal subjects. 2. In the ordinary persons, the rotary movements near the ICP were mostly larger during the closing movements than during the opening movements. In both patients with ADD with reduction and without reduction, the rotary movements were larger during the opening movement than during the closing movement. 3. The results of our study suggest that the dual axis graph could be a useful tool in examining the rotary movement of the mandibular head.

Humans↗

PubMed1989

[Reconsideration of anterior reference point in prosthodontics. Orbital point, Inner Canthus of the eye and alae of the nose].

With the aim of designing more aesthetic prosthetic replacements, a series of experiments was conducted to obtain the points of reference for determining the postures (sitting and standing postures) and horizontal reference plane when patients assume the natural head position. The results thus obtained are as follows: 1. Measuring points in the sitting and standing postures were located about 15.0mm below the orbital point respectively. 2. The natural head position tended to shift upward significantly more frequently in the standing posture than in the sitting posture. 3. The natural head position in the standing posture varied less and was more restorable than in the sitting posture. 4. Between the three reference points in both postures, there was no significant difference in the degree of variation, but measurements based on the inner canthus of the eye showed the least variance. 5. In the standing posture, the measurements based on the inner canthus of the eye showed a little, but significant, variance from the measurements based on the three reference points in the sitting posture. From the above, it can be said that the point 25.6mm below the inner canthus of the eye, which was the average of the measurements taken in the standing posture, may be appropriate for use the anterior point of reference for transferring the natural head position onto the articulator.

Cephalometry↗

PubMed1989

[Study on the horizontal reference plane in prosthodontics. Establishment of the anterior reference point].

This study was made to obtain the anterior reference point for determining the horizontal reference plane in prosthodontics for transferring the model in the natural head position of each patient onto the articulator in dental clinics. The results thus obtained are as follows: 1. Measuring points in the sitting and standing postures were located below the orbital point, respectively. 2. The natural head position tended to shift upward significantly more frequently in the standing posture than in the sitting posture. 3. The natural head position in the standing posture varied less and was more restorable than in the sitting posture. 4. The natural head position in the mirror-viewing method varied less and was more restorable than in two other methods. 5. Between the three reference points in the natural head position, the measurements based on the orbital point and the inner canthus of the eye showed less variance than the measurements based on the ala of the nose. 6. The ratios calculated from the measurements based on the reference points in the natural head position showed slightly more variance than the measurements based on the reference points. 7. From the above, it can be said that the point 23.3mm below the inner canthus of the eye, which was the average of measurements taken with the mirror-viewing method in the standing posture, may be appropriate for use as the anterior reference point for transferring the model in the natural head position of each patient onto the articulator.

Cephalometry↗

PubMed1989

[A case of complete rupture of the righ TMJ disc].

A case of complete rupture of the right TMJ disc was described. A 43 year old woman visited our hospital with the chief complaint of a mild pain in the right TMJ. Initially, a conservative treatment using the occlusal splint (condylar repositioning appliance) was carried out. This was because she had reciprocal clicking of the right TMJ which had occurred not long before and it seemed that the symptoms were due to the trouble with the disc. In spite of this treatment, for 6 months no improvement was obtained and the reciprocal clicking changed into crepitation. Moreover the double contrast arthrotomographic image indicated a perforation or a wide rupture of the disc, and deformities of the articular bone. Then a right TMJ osteoarthrosis with wide (complete) disc rupture was diagnosed, and a discectomy was performed. The symptoms were greatly reduced by this treatment. It was conceivable that the steroid which she had used for a long time to treat bronchial asthma caused a remarkable inhibition of the tissue repairing, and an internal derangement of the TMJ rapidly progressed to osteoarthrosis.

Adrenal Cortex Hormones↗

PubMed1988