Aichi Gakuin Daigaku Shigakkai shi最新文献

{"title":"[Bone inductive activity of beta-tricalcium phosphate-bone morphogenetic protein complex].","authors":"A Mieki","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>For the development of new implantable biomaterials as bone substitutes in the treatment of jaw bone defects, bone morphogenetic protein (BMP) bound to porous beta-tricalcium phosphate (beta-TCP) was investigated in the present experimental study in mice. The BMP was extracted from bovine cortical bone while the beta-TCP was synthesized by a mechanochemical method. The affinity of BMP to beta-TCP was examined by means of beta-TCP column chromatography. The porous beta-TCP combined with the BMP by dialysis was implanted in the muscle pouches of mice. The beta-TCP or BMP alone was also implanted in the same places in the controls. Three weeks after the implantation a new bone formation was observed in the exterior surface of the beta-TCP/BMP complex, but not in that of the beta-TCP control. The quantity of bone induced by the beta-TCP/BMP complex was determined on the X-ray film by a computer supported image analysis system. The osteoinductive activity of the complex was higher than that of the BMP alone. The histological relationship between the beta-TCP/BMP complex and the original tissues was excellent. The result of the present study may indicate that the beta-TCP/BMP complex can be used as an osteogenetic biomaterial for the treatment of bone tissue defects.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"43-58"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Study on high temperature oxidation of Ni-Cr ceramic alloys. Effects of Cr and Mo].","authors":"M Mizutani","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The effects of Cr and Mo addition to Ni-Cr alloys on high temperature oxidation were investigated. The alloys were prepared with the composition of Cr ranging from 5 to 40 wt%. Also 2, 4 and 9 wt% of Mo was added to both Ni-5% Cr and Ni-20% Cr binary alloys. The alloys were heated at 800 degrees C, 900 degrees C and 1000 degrees C for 15 minutes in air, and the weight change after heat treatment was measured by electric automatic balance. The weight change during heating was measured by thermogravimetric measurement (TG). The products after heat treatment were characterized by X-ray diffraction and scanning electron microscopy (SEM). The results are summarized as follows: The Ni-Cr binary alloys were classified into three types of Cr ranging from 5 to 20 wt%, Cr 25% and Cr from 30 wt% to 40 wt% according to the weight gains with oxidation. In the case of the more than 25 wt% Cr content of the Ni-Cr binary alloys, the weight gain was extremely low and the heating temperature effects on the weight change were also small. X-ray diffraction study showed that NiO, NiCr2O4 and Cr2O3 formed on the surface of the Ni-Cr binary alloys whose composition of Cr ranged from 5 to 25 wt%, whereas NiO and NiCr2O4 rarely formed on the Ni-Cr binary alloys whose composition of Cr ranged from 30 to 40 wt%. This suggests that the formation of Cr2O3 prevents the formation of NiO on the alloy with a high Cr content. The weight gain of the Ni-Cr-Mo ternary alloys was smaller than that of the Ni-Cr binary alloys without Mo, and the temperature effects on the weight gain of the Ni-Cr-Mo ternary alloys were different for each Cr content. However, the effect of the amounts of Mo was small. NiO, NiCr2O4, Cr2O3 and MoO2 were identified by X-ray diffraction on the surface of the Ni-Cr-Mo ternary alloys. According to the SEM observation, it seems that NiO was formed at the outermost layer, both NiCr2O4 and Cr2O3 at the inside layer, and MoO2 at the innermost layer. The formation of both NiO and Cr2O3 on the Ni-Cr-Mo ternary alloys was restrained compared with that of the Ni-Cr binary alloys. However, the adhesion of oxides to the Ni-Cr-Mo ternary alloys was lower than that of the Ni-Cr binary alloys.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"59-78"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Effect of long-term methotrexate-induced neutropenia on experimental periodontal lesion in rats].","authors":"N Yoshinari","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of the present study was to investigate histologically and histometrically the effect of a long-term methotrexate-induced neutropenia on the periodontal lesion in rats. Forty rats were used in this study. The control side (the interdental area between the left maxillary 1st and 2nd molars) of the rats received no treatment. In the experimental side (the interdental area between the right maxillary 1st and 2nd molars) of the same animals, a suturing nylon thread was inserted into the interdental space between these two molars for 3 weeks to produce a slight inflammation of the gingival tissue. Then, the animals were divided equally into Group A and Group B. Group A received no injection of methotrexate, whereas Group B was injected with 1.0 mg/kg of methotrexate 3 times per week for 1 to 9 weeks. Animals of both groups were killed at 1, 3, 5, 7, and 9 weeks. During the sacrifice, peripheral blood was taken from all animals. White blood cells and neutrophils were counted and the periodontal tissues were examined by light microscopy. 1. Blood findings In Group A, the white blood cell count and neutrophil count did not show any changes for 9 weeks. In Group B, however, the white blood cell count and neutrophil count decreased at 3 to 9 weeks. 2. Histological findings In Group A, the control side did not show any changes for 9 weeks, but the experimental side showed a slight gingival inflammation and a moderate alveolar bone resorption at 7 and 9 weeks. In Group B, the control side was similar to that in Group A for 9 weeks, but the experimental side displayed a slight gingival inflammation and a severe alveolar bone resorption at 7 and 9 weeks. 3. Histometrical findings In Groups A and B, the control sides did not show any changes for 9 weeks in the gingival ressection. However, in both groups, the experimental sides showed an increased gingival ressection from 1 to 9 weeks. In the experimental sides, the gingival ressecion between these two groups did not show any differences statistically. In Groups A and B, the control sides did not show any changes for 9 weeks in alveolar bone loss. However, in both groups, the experimental sides showed increasing alveolar bone loss from 1 to 9 weeks. In the experimental sides, the alveolar bone loss in Group B at 7 and 9 weeks was significantly severer (p less than 0.01) than that in Group A for the same weeks.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"345-66"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Dependence of incisor dentin mineralization on plasma calcium levels in parathyroidectomized rats].","authors":"M Yoshida","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>This experiment was performed to clarify whether mineralization of incisor dentin depends upon plasma calcium (Ca) levels. Male Wistar rats (7 weeks old) were parathyroidectomized (PTXed) and given vitamin D-deficient diets containing various amounts (0.3-2%) of Ca for 2 weeks in order to maintain the plasma Ca at various levels and to examine their relationship with the mineralization of incisor dentin. Plasma Ca levels, which were lowered to about 6 mg/dl by PTX, ranged from 5.1 to 10.1 mg/dl after feeding on diets containing various amounts of Ca; the plasma Ca level in the group given 2% Ca reached the same level as that in the sham-operated group. On the other hand, plasma phosphorus (P) levels, which were increased by PTX, reduced markedly with increases in dietary Ca, leading to hypophosphatemia in the group given 2.0% Ca. In this series of experiments, the plasma Ca levels in PTXed rats seemed to be kept constant by the dietary Ca without any involvement of hormones regulating the Ca metabolism because a high correlation was found between the plasma Ca and the dietary Ca (r = 0.987). Both dry and ash weights of the upper incisor also increased with the plasma Ca levels, but with the plasma P levels it was just the opposite. The content of ash in the incisor also increased with the plasma Ca levels. Transverse sections of the lower incisors stained with hematoxylin showed a zone of remineralization of the dentin on the lingual aspect in rats with plasma Ca levels of about 6.5-7.0 mg/dl; the width of the zone was greater in groups of rats with higher plasma Ca levels. Appositional rates of dentin (y, micron/3 days) as determined by a time marking method showed a high positive correlation with the plasma Ca levels (x, mg/dl). The regression equations were as follows: y = 4.8 + 5.7x (r = 0.915, p less than 0.001) on the lingual aspect and y = 6.0 + 5.8x (r = 0.959, p less than 0.001) on the labial aspect. There were a high positive correlation and a negative correlation between appositional rates of dentin and plasma Ca: P ratios (r = 0.928) and between appositional rates of dentin and plasma P levels (r = -0.927) or the products of plasma Ca x P (r = -0.834). These results suggest that the mineralization of incisor dentin depends upon the plasma Ca levels in PTXed rats.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"225-39"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Properties of experimental high abrasion resistance plastic teeth].","authors":"Y Takahashi,&nbsp;J Hasegawa,&nbsp;K Hiranuma,&nbsp;H Mori,&nbsp;A Hasegawa","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>High abrasion resistance plastic teeth made of microfilled urethane dimethacrylate resin were developed around ten years ago. In recent years, several of this same type of resin teeth were developed and introduced commercially in Japan. Many studies have reported the properties of restorative resin materials, but few comparative studies have been conducted among the various resin teeth on the market. The purpose of this study was to compare the basic physical properties of conventional acrylic resin teeth as dental materials with an experimental high abrasion resistance plastic for posterior teeth made of microfilled urethane dimethacrylate. In addition, we compared the properties of the experimental teeth with the other high abrasion resistance plastic teeth including a comparative study of anterior and posterior teeth already on the market. The results indicated that basic physical properties of the experimental posterior resin teeth were better than those of the conventional acrylic resin teeth, but the staining resistance of the former was a little lower than that of the latter. Further, the experimental posterior teeth appeared to have physical properties equal to those of other resin teeth of the same type, but the staining resistance of the experimental resin teeth was higher.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"271-81"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12889510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Morphological study using Moiré patterns on the dental arch and palate of Japanese with normal occlusion].","authors":"Y Hotta","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Studies of the dental arch and the palate have progressed from two-dimensional to three-dimensional analysis. However, many points still need clarification in this field even though the fundamental structure of arch and palate have a common function in connection with mastication. The present study, using three-dimensional measurements of the palate, endeavors to clarify the differences in palatal morphology as these are affected by the changes in the dental arch morphology. Casts were made using 62 males between the ages of 20-25. Only those casts which were considered to represent normal occlusion of the upper dentition were selected for use in this study. Photographs of the casts were studied using the Moiré topographical method with a grid of 0.5 mm. Seven points were selected for measurement purposes (figs. 2 and 3). Based on these points, the seven distances were used in this study. Measuring of the palate was performed in the following manner: lines were drawn radially from the origin (F) to the most lingually protrusive point on the gingiva of each of the 12 teeth from the right first molar round to the first molar on the left side. The points of mergence by these lines with every second line (2 mm deep) of the Moiré pattern were fed into a digitizer. The results were summarized as follows: 1. The anterior, posterior and complete arch chords were 23.73 mm, 19.93 mm and 41.68 mm respectively. The anterior, posterior and complete arch lengths were 14.14 mm, 19.98 mm and 34.12 mm respectively. The anterior and posterior arch widths were 38.02 mm and 50.73 mm respectively. 2. As for the correlation coefficients, there was a correlation between the lengths and widths of the anterior portion, but not for the posterior. 3. The length from the origin (F) to the papilla incisiva was 25.4 mm, and the depth of the palate at the origin (F) was 13.4 mm on the average. 4. In the vertical cross section of the palate for each tooth, the slope line of the palate gradually increased from the incisors to the first molars, but the amount varied between the anterior and posterior portions of the maxillary dentition. Also, the line of the palate converged at one point about 11 mm from the origin (between lines 9 and 11 on the Moiré pattern). 5. In the horizontal cross section of the palate, the shape of the palate was almost semi-circular in the range of Moiré lines 9-11 with the origin at the center.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"321-43"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Chemical analysis and immunochemical characterization of serotype-specific antigens from the strains of Actinobacillus actinomycetemcomitans which were frequently found in the periodontal pockets of the patients of localized juvenile periodontitis].","authors":"K Amano","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Serotype-specific polysaccharide antigens of Actinobacillus actinomycetemcomitans ATCC 29523 (serotype a), Y4 (serotype b) and NCTC 9710 (serotype c) were extracted from whole cells by autoclaving. The extracts were purified by chromatography on DEAE-Sephadex A-25 and Sephacryl S-300 columns. The purified polysaccharide antigens formed a single precipitin band with the corresponding anti-a, b or c serum on immunodiffusion. Analysis of component sugars by GLC, HPLC, GLC-MS, NMR together with specific optical rotation data showed that the serotype a antigen consisted of 6-Deoxy-D-talose, the serotype b antigen consisted of L-rhamnose and D-fucose, and the serotype c antigen consisted of 6-Deoxy-L-talose. Structural analysis indicated that these antigens were composed of closely related repeating units, -3)-6-deoxy-alpha-D-Talp-(1-2)-6-deoxy-alpha-D-Talp-(1- (serotype a), -3)-alpha-D-Fucp-(1-2)-beta-L-Rhap-(1- (serotype b) and -3)-6-deoxy-alpha-L-Talp-(1-2)-6-deoxy-alpha-L-Talp-(1- (serotype c). 13C and 1H-NMR analyses suggested that the serotype a and c polysaccharides carried approximately one acetyl group per two sugar residues, although the acetylated position was not identified. In quantitative precipitin inhibition tests, the component sugars showed very low inhibition, whereas the partial hydrolysates of these antigens were effective inhibitors. These results suggest that the serotype-specific antisera recognize larger oligosaccharide units.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"461-81"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Effects of cusp angle on the adaptation of masticatory function].","authors":"H Usami","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of this study was to elucidate the adaptation in masticatory function by changing the cusp angle of the natural dentition of one person using a metal splint. During each experiment mandibular movements and EMG were recorded during a period of weeks. While chewing raisins as test food, mandibular movements as measured by the lower incisal point displacement were detected three-dimensionally using the Selspot system, and electrical activity of the masticatory muscles was picked up for the anterior temporal and masseter muscles, at the right and left using surface electrodes. The time schedule was composed of three terms: (1) before insertion of the splint, (2) for 20 days after insertion of the splint and then for 30 days after removal (Experiment-1), (3) for 14 days after reinsertion of the splint and then for 7 day after removal (Experiment-2). The measurements were done for the following 7 indices: (1) opening phase, (2) closing phase, (3) cycle time, (4) stopping phase (St), which is the period when the mandible was stationary during occlusal contact, (5) duration of EMG activity, (6) duration of EMG silence, (7) the period of EMG silence (IA), which is the period from the end of EMG activity to the end of the stopping phase. The following results were obtained 1) On changing the cusp angle, there was an increase in cycle time, closing phase, opening phase, duration of EMG activity, and duration of EMG silence, but the stopping phase was less than before insertion of the splint. These 6 indices showed a great variation and became irregular at first. 2) The irregularity of the masticatory function disappeared gradually, and then all indices approached the value before insertion of the splint from day 5 or day 20 at the latest. 3) Scarcely any reaction was detected in IA or in the ratio of cycle time and opening phase throughout the measurement period. 4) The indices of the reinsertion period (Experiment 2) approached the value before insertion more rapidly than the period of the insertion (Experiment-1). And the indices after removal quickly approached pre-insertion values. In short, the indices of the time factor of the masticatory function showed that the effect of changing cusp angle was handled as only disturbances. And once the first adaptation was completed, masticatory function responded more quickly to the same stimulus.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"483-97"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[A study of the relationship between the capacity of oral cavity proper and skeletal malocclusions].","authors":"A Yamada","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A new method was developed for evaluating the quantitative capacity of the oral cavity proper with a three dimensional measurement system, and this was used to measure the capacity in 50 cases of adult female malocclusions. Morphologies of the dental arches, palates and maxillo-facial structures were measured on dental casts and both P-A and lateral cephalograms. Correlation coefficients were calculated between those measurements and the capacity of the oral cavity. Results are shown below: 1. Class III cases were statistically larger than classes I and II in the capacity of the oral cavity proper but there were no significant differences between those of class I and class II. 2. There were no significant differences among classes I, II or III in the maxillary capacity of the oral cavity proper. Class III, however, was significantly larger than classes I and II in the mandibular capacity of the oral cavity proper. 3. There was no significant difference among the three types of palatal morphology: Horizontal, Convex, and Concave. 4. Porions where high correlations were shown were different for classes I, II and III as to the relationship between both the dental arch length and width, and the capacity of the oral cavity proper. The general indication was that width was more related to the size of the capacity of the oral cavity proper than length was. 5. There were significant correlationships between the capacity of the oral cavity proper and maxillo-facial skeletal size in class I, the vertical dimension in class II, and the mesio-distal dimension in class III for the mandibular and maxillary measurements of both P-A and lateral cephalograms.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"203-23"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Comparative study of the palatal rugae and shape of the hard palatal in Japanese and Indian children].","authors":"K Kashima","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The materials for study were serial upper jaw plaster casts of 58 Japanese (29 boys and 29 girls) aged 3 to 7 years, and 93 Indians (46 boys and 47 girls) aged 5 to 8 years. I observed and measured the palatal rugae, the papilla incisiva and the shape of the hard palate using the method of Yamazaki, following Lysell's and Hauser's. The differences according to population (1-5), palatal findings (6) and sex (7) are summarized as follows. 1. The number of primary rugae of Japanese children were more than those of Indian children, but the number of transverse palatal rugae were the same. 2. There were differences between Japanese and Indian children in the primary rugae shapes, the posterior limit of the rugae zone, the number and position of the secondary rugae and fragmentary rugae. 3. The papilla incisiva of the Japanese children were a little larger than those of the Indians. Generally the papilla incisiva of the two populations were pear-shaped, but the Indians showed more variability. 4. The palatal raphe of the Japanese were wider than those of the Indians. The number of children with no palatal raphe branch was large for Indian children, but small for Japanese. 5. The frontal view of the hard palate of Japanese children was broad and that of Indian children was narrower than the Japanese. The palatal shape of the two populations was almost trapezoid. The occlusal view of the two populations was broad and U-shaped. 6. There were many transverse palatal rugae in the two populations at the left side. The posterior limit of the ruga zone of the left side was shifted further back than the right side. 7. There were no significant differences between sexes for most of the above points.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"295-320"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}