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Root Canal MeterとEndodontic Meterの臨床での比較検討について
Get PDFapplication/pdfA clinical study was done in order to discover the relationship between the readings of the Endodontic Meter and the Root Canal Meter, the latter of which had been used as the standard. These two electric devices were also studied on their usefulness in determining the working length for the preparation of an apical seat. The results were as follows: 1. When a 25 or 30 size reamer was inserted into the root canal to the apical portion on the pulpectomy and at a 40μA reading of the Root Canal Meter, the mean reading of the Endodontic Meter was 41.0μA. 7 out of 17 cases ranged from 40.0μA to 40.5μA. At the beginning of the first treatment after the pulpectomy, the reading of the Endodontic Meter was in the range of 40.0±0.2μA on 10 out of 14 cases. It was recognized that the readings of the Endodontic Meter were more definite on root canal treatment after pulpectomy than during pulpectomy. 2. Using 40, 50 or 60 size reamers according to the kind of teeth, root canals were prepared to 1.0mm short of the root canal length at 40μA by the Root Canal Meter. At this working length, neither the Root Canal Meter nor the Endodontic Meter could give definite readings, and the readings of both were scattered. This method appears to be useful in determining the working length for the preparation of apical seats.journal articl
カエル舌咽神経電気刺激による反射性放電の発火様式と潜時の比較
Get PDFapplication/pdfReflex neural discharges recorded in the branch of the trigeminal nerve innervating the submental muscle, following electrical stimulation of the glossopharyngeal nerve, exhibited temporal facilitation, after-discharge and fluctuant long latency, whereas those recorded in the hypoglossal nerve did not. These facts suggest that the reflex pathway of the nostrilclosing reflex is more complicated than that of the linguo-hypoglossal reflex in the frog.journal articl
A Comparison of Four Types of Toothbrushes and Different Tooth Brushing Methods on Plaque Removal I. Examinations using second year dental hygiene students as subjects
Get PDFapplication/pdfTo clarify the relationship between the type of brush and brushing methods, 30 students in Mastumoto Dental College, School of Dental Hygiene were requested to use 4 different types of brushes with 4 brushing methods during 4 two week periods. The following results were obtained: 1. Brushing methods: The scrub method had the best results in plaque control, followed by the Bass, modified Stillman and roll methods in that order. A significant difference was observed with these brushing methods (p<0.01). 2. Toothbrushes: Test brushes S and M got the best results, and H and the open-tufted brushes followed. Significant differences were observed with these brushes (p<0.01). 3. Interaction between brushing methods and brushes: Plaque control effectiveness tended to differ with brushing method between the facial and proximo facial surfaces, a. Facial surfaces: Test brush H showed a higher plaque control effectiveness with the scrub and Bass methods than that of test brushes M and S. Test brush M was the most effective for plaque control using the roll and modified Stillman methods. b. Proximofacial surfaces: Test brush S was the most effective with the Bass method and M was more effective with the other methods.journal articl
ハイドロキシアパタイトセラミックスインプラントに関する組織学的研究埋入と非埋入における比較
Get PDFapplication/pdfThis study was made to compare tissue differentiation and bone formation around hydroxy apatite (HAP) ceramics implants between the implants embedded completely in the bone (embedded implants) and those implanted conventionally (unembeded implant). In adult dogs. of which P_2 P_3 P_4 teeth had been extracted, two HAP ceramics implants were inserted, to the holes made in the mandibules of the dogs three months after extraction, and one of them was cut off its head at the level of the alveolar ridge. The dogs were sacrificed three months after insertion and the tissues surrounding the HAP ceramics implants were histologically investigated. Three months after implantation, all the surfaces of embedded implants are covered with newly formed bones. These bones were made direct contact with the ceramics. In unembedded implants, newly formed bones covered the surface of the implants, but a small amount of fiberous connective tissues was detected in the bone-implant interface. These results indicate that the bone formation of the embedded implants was more rapid than that of the unembedded implants.journal articl
扁平上皮癌組織より分離した上皮系と間葉系の2種類の株化細胞の樹立
Get PDFapplication/pdfTwo kind of cell lines (H-I, H-II) derived from epithelial squamous cell carinoma of the maxilla were established. These cell lines have passed though more than 46 trancfer generations, and H-I was histologically differed from H-II. H-I was coposed of epitherial cells and H-II of spindle-shaped cells similar to fibroblast. The doubling time of H-I cell and H-II cell showed 21 hrs and 18 hrs, respectively. The colony-forming ability of H-II cell was higher than that of H-I cell. Heterotransplantation of cultured H-II cells was possible, but not of H-I cells. We concluded that these cell lines are useful for further research in oncology.journal articl
Endocaterの臨床使用経験について
Get PDFapplication/pdfEndocater, the newest electric root canal measuring device, was clinically evaluated on pulpectomy cases. Root Canal Meter was employed as control. The results were as follows: 1. The hand reamer was inserted into the root canal, of which most of the pulp had been previously removed, and the root canal length was measured by Endocater according to the manufacturer's instruction. In 12 (root canals) out of 48 cases, the reamer tips were between 0.2mm and 0.5mm shorter than the root canal length measured by Root Canal Meter at 40μA. In 10 cases, they were between 0.6mm and 2.8mm shorter than the root canal length at 40μA. In the remaining 26 cases, they were more than 3.8mm shorter than the root canal length at 40μA. 2. The cases in which the meter readings of the Endocater -with the working length shortened 1.0mm of the 40μA length- were between -3.0mm and +3.0mm from the central line of the meter, were 38 out of 55 cases (69.0%) at the time of pulp removal, and 47 out of 57 cases (82.5%) at the beginning of the next appointment after the pulpectomy. At this working length, the meter readings of the Root Canal Meter scattered from 28.0μA to 39.0μA, and 78.2% of the pulp removal time or 82.5% of the next appointment were included in this range. 3. Apical seat formation was evaluated by examining the location of master corn tips using X-ray dental photographs taken immediately after the root canal filling. In 39 out of 52 cases (75.0%), apical seats were formed in the range of 0.6mm to 1.2mm short of the root apex. Another 10 cases had apical seats formed between 1.4mm and 2.8mm short of the root apex. 8 cases failed in apical seat formation.journal articl
模型実習における総義歯の臼歯部人工歯の排列状態に関する検討上下顎第2小臼歯,第1,第2大臼歯について
Get PDFapplication/pdfUndergraduate students in dental colleges are required to establish the arrangement of artificial teeth in the upper and lower occlusion-rims of complete dentures. However, this is very difficult. Thus, we studied the inaccuracies in the positions of posterior artificial teeth in 69 pairs of upper and lower complete dentures constructed by the undergraduate dental students. The results may be summarized as follows: 1) Positional relationship between the alveolar ridge and the posterior artificial teeth of upper and lower complete dentures (69 pairs): Some teeth are placed properly above the alveolar ridge. Lower teeth are placed more accurately above the alveolar ridge than the upper teeth. Many teeth deviated buccally from the alveolar ridge on the upper dentures, and lingually on the lower ones. 2) The crossing part of the occlusal surface with the interalveolar crest lines: The second premolar is 35-70%, the first molar is 35-60% and the second molar is 15-40%. 3) Contact points on the occlusal surface: Many of the upper and lower second molars do not have any contact point on the occlusal surfaces.journal articl
