Aichi Gakuin Daigaku Shigakkai shi最新文献

{"title":"[A new edentulous model maintained at body temperature].","authors":"T Ono,&nbsp;T Kawaguchi,&nbsp;Y Takasawa,&nbsp;A Tashiro,&nbsp;T Terakura","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We have produced a new edentulous model, which is maintained at the human body temperature, for higher grade model practice and pre-clinical education. A soft material, its thickness based on the value of the oral mucosa, covers the surface of this model. It takes 4 minutes to reach the body temperature after turning on the switch, and it consumed about 9 watts per hour. This new model is useful for teaching clinical characteristics of impression materials in which the setting time is influenced by the temperature. Improvements are under consideration to fit some thermal and pressure sensors to the buccal and labial parts to make a more sophisticated patient simulator.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1043-6"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633630","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":"[Survey of what dental students feel regarding their profession (3). The relation with their self concept].","authors":"T Tsuchiya,&nbsp;Y Yamada,&nbsp;K Kurosu","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The present survey was undertaken to find out how dental student feel about their profession and what type of the self concept they have. The subjects were 263 students in the 5th and 6th grades of dental school, Aichi-Gakuin University. The pattern of self concept as dental students or dentists was classified into three types, based on a survey of twenty statements test. These types were positive, negative and neutral. The results were as follows: 1. In both the 5th and 6th grades, statements about \"present satisfaction as a dental student\", in the 5th grade, \"progress of university entrance examination\", and in the 6th grade, \"feelings about the scholastic side of dentistry\", were strongly related to their type of self concept. But in both the 5th and 6th grades, there were few related statements about \"the motive for entering the dental school\" and \"occupational choice after graduation\". 2. In the result of the multivariate analysis Discriminant Analysis by the Second Class of Hayashi's Quantifying Theory, those students who were graded as \"positive\" had the following characteristics: (1) Regarding entrance examinations, they took only one examination for dental school when they entered. (2) When choosing dentistry as their occupation, they had not thought of it as a \"self supporting occupation\" or \"occupation of high social standing\". (3) Their present interest is learning about dentistry. (4) After their graduation from dental school, they would like to be professional dentists or, a practicing dentists or students of clinical dentistry in the hospital of the dental school.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1047-60"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633631","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":"[Case report of progenie with a congenitally missing mandibular right incisor].","authors":"S Hamajima","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The female in this case was 9 years and 9 months old at the initial visit with a dental stage of III B. The chief complaint was anterior cross bite. Diagnosis revealed a class III angle at the right side and class I at the left. The ANB angle was -3.0 degrees with mandible shifting to the left side. Tooth size was large, and a lack of space, observed, and 2 was congenitally missing. A chin cap was used for treatment to retract and inhibit mandibular growth. The anterior cross bite was corrected within two months when class I angle molar relationship was achieved and the extraction of midline was also corrected. Since the lack of space in the upper arch was about 10 mm, extraction of 5 was decided, although the assigned ANB angle improved to be -0.5 degree within one year of treatment. 3 was to replace the position of the congenitally missing 2. At the age of 11 years and 1 month, 4 was extracted to guide the eruption of 3. 4 and E were extracted guide the eruption of 3 and 5. Then 5 was extracted. As a result of these serial extractions, space closing and leveling were automatically achieved without use of the multibracket system. Good stable occlusion has been maintained up to the present age of 15 years and 8 months.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1089-100"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633634","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":"[Case report of long-term treatment of a cleft lip and palate patient].","authors":"T Negoro,&nbsp;K Yoshida,&nbsp;T Kajiwara,&nbsp;T Suzuki","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Cleft lip and palate patients have narrow maxillary arches and mesio-distal disharmony between the jaws caused by cicatricial contracture from cleft lip and palate surgeries. In such cases, early orthodontic treatment is required including improvement of the mesio-distal disharmony of the jaws. Following orthodontic treatment, prosthodontic treatment is required to improve the masticatory function and esthetic appearance in the cleft area. Thus, improving the occlusion of cleft lip and palate patients takes a long time. This case report concerns such a longterm handling of over 17 years from the initial treatment at 5 years 3 months till the final prosthodontic treatment for an under-developed maxilla with partial closure of the fistula to which ilium was later grafted following orthodontic treatment. Considerations are discussed about timing of the initiation of orthodontic treatment, closure of the oronasal fistula and the final prosthodontic restoration.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1119-29"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633637","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":"[Two case reports of extraction with the upper central incisors].","authors":"T Sasaki","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Although extraction of the upper central incisors is very rare because of their esthetical importance, they are sometimes extracted when impaction, root resorption, abnormal morphology, severe caries and/or trauma are involved. When extracted, tooth size adjustment, crown-bridge and/or orthodontic treatment are proposed for functional and/or esthetic improvement. Two present cases were reported of Angle class I crowding with root resorption of the upper central incisors caused by apical abscess (case 1) and impacted canines (case 2). The above central incisors were extracted and orthodontic tooth alignment was performed on both cases prior to final occlusal adjustment. Problems we encountered in through these cases were tooth size ratio between the upper and lower teeth causing spacing arch and/or disharmony of occlusion. In case 1, edge to edge anterior relationship was established because the over-all tooth ratio was 93.30% which was out side one standard deviation although the upper lateral incisors were tipped mesially to create some spaces. The over-all tooth ratio in case 2, however, was 92.13% which was inside one standard deviation and normal occlusion was restored. It is suggested that final tooth size adjustment is necessary for good occlusion in extraction cases of upper central incisors.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1101-11"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633635","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":"[Influence of hypoproteinemia on the development of skull, mandible and teeth of the rats--metrical studies].","authors":"Y Saitoh","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The amounts of plasma protein in eight groups of rats, A-H, was controlled by diet and a daily study was undertaken to investigate the effect that varying amounts of plasma protein have on body weight, the growth and development of body length, growth of the skull and mandible and development of the teeth. The following conclusions were obtained. 1. It was possible to keep the amount of plasma protein constant in each group by using a specially prepared diet containing differing amounts of casein. Also, when the rats with hypoproteinemia, due to a non-casein diet, were given food containing 24.5% casein, it was found that their plasma protein levels easily and quickly returned to normal. 2. Weight: Counting the first day of the experiment as 100, growth for group A (given a 24.5% casein diet) had reached 281.7% by the fifteenth week, whereas group H (fed a non-casein diet) reached a growth of only 48.5%--below half of day one of the experiment. On the other hand, each group which started out with a non-casein diet and later changed to a 24.5% casein diet recovered very quickly, but not to the extent of group A by the fifteenth week. Body length for all experimental groups increased from the first day to the third week, after which there was a tendency to approximate the body weight. 3. Effect of hypoproteinemia on skull growth: Growth was small for groups B and C whose plasma protein amounts were kept constant. Hardly any growth was seen in groups D and H. Groups E, F and G, whose plasma protein levels were restored, showed a high growth ratio after their diet was changed. Growth of the mandible showed a similar pattern. 4. A comparison of measurements for different parts of the skull indicated different patterns of growth and development for the upper and lower parts. For the upper part, the least growth was in the center followed by the rear area with the largest growth for the nasal bone at the front. The greatest growth ratio in the lower part of the skull was seen in splenoid and occipital bone lengths at the rear followed by the front area and central area. Growth of angular process length of mandible showed a very high growth ratio. 5. The amount of growth for each part of the skull from the largest to the smallest was found to be in the same order for both the upper and lower parts: the front, center and rear.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"885-912"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13636344","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":"[Comparisons of bioavailability of various calcium salts. Utilization incisor dentin in parathyroidectomized rats].","authors":"S Matsumoto,&nbsp;M Arai,&nbsp;M Yamaguchi,&nbsp;A Togari,&nbsp;T Ohira,&nbsp;H Takei,&nbsp;M Kohsaka","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In the present study, we compared the bioavailability of various calcium salts in the diet such as calcium lactate, calcium carbonate and calcium phosphate by examining the effects of these calcium salts on serum calcium concentration and on the mineralization of incisor dentin in parathyroidectomized (PTXed) rats. Each rat was given daily 12 g of a low calcium (0.1% Ca) diet beginning from 3 days before the operation and continuing for 11 days after. Then the diet was changed to those containing various calcium salts (1.5% Ca). The serum calcium and phosphorous concentrations were examined every three days, just before feeding time and 6 hours after. The degree and site of the mineralization of incisor dentin were examined histologically by a time marking method using lead acetate. In the PTXed rats maintained on a low calcium diet, the serum calcium concentration decreased to about 4.5 mg/dl and the mineralization of incisor dentin was inhibited. On the 11th day, just before feeding on diets containing various calcium salts, the serum calcium concentrations were very similar for each group, but at 6 hours after feeding, concentration was 7.6 mg/dl in the calcium lactate group, 6.2 mg/dl in the calcium carbonate group and 4.8 mg/dl in the calcium phosphate group. On the 17th day following administration of the high calcium diets, the serum calcium concentrations were 9.8 mg/dl in the calcium lactate group, 8.4 mg/dl in the calcium carbonate group and 4.4 mg/dl in the calcium phosphate group. Mineralization of the incisor dentin was best in the calcium lactate group, moderate in the calcium carbonate group and poor in the calcium phosphate group. We also examined the effects of dietary phosphorus contents on serum calcium concentrations and on the mineralization of incisor dentin using PTXed rats. On the 17th day following the administration of diets (1.5% Ca, with calcium lactate) containing various amounts of phosphorus, the serum calcium concentrations in the calcium lactate group were 8.8 mg/dl (0.4% P), 6.9 mg/dl (0.8% P) and 4.2 mg/dl (1.6% P) respectively. Mineralization of incisor dentin was also inhibited in rats fed a high phosphorus diet. These results suggest that in PTXed rats, absorption of calcium from the intestines and mineralization of the incisor dentin is best by the administration of calcium lactate, moderate by calcium carbonate and poor by calcium phosphate, and that phosphorus in the diet inhibits calcium absorption from the intestines.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1029-41"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633629","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":"[Orthodontic case report of anterior cross-bite with periodontitis].","authors":"S Yamamoto","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In adult orthodontic patients, there is an increasing concern about good looks, esthetic orthodontic appliances, and improved surgical orthodontic treatment. The present report presents a case of a 33-year-old female with cross-bite in 1/12 and marginal periodontitis. Orthodontic tooth movement was performed following a flap operation to eliminate a gingival pocket. The treatment was successful resulting in good occlusion and healthy periodontal tissue.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1081-8"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633633","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":"[Dynamic study of orthodontic wires for Edgewise appliance].","authors":"A Togari","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In this research, I conducted a dynamic assessment of both the orthodontic direct force of a round wire and the torque of a rectangular wire, which are used quite commonly for clinical orthodontic treatment. The results are summarized as follows. 1. Leveling .0175\" multistranded wire and .016\" Ni-Ti wire are orthodontic wires with great flexibility and are superior to others for clinical use at the early stage of leveling. However, if the wire is too firmly legated to the teeth with a flexure of more than 2.0 mm for the former, and more than 0.5 mm for the latter, there is the danger of excessively strengthening the orthodontic force. In the case of .016\" stainless steel wire, it is highly possible to give an excessive orthodontic force if it is tied to all the teeth affected by crowding without a bending loop. 2. Torquing Because of their low torque, .017\" x .025\" multistranded wire and .017\" x .025\" Ni-Ti wire are suitable for controlling torque from the early stage of treatment. The careless use of .017\" x .025\" and .018\" x .025\" stainless steel wires must be avoided because of the possibility of producing an excessive torque on a local part.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1007-15"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13634366","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":"[Fatigue properties of dental alloys. 12% Au-Pd-Ag alloy and type III gold alloy].","authors":"H Kato","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Usually the mechanical properties of dental alloys are determined from the values obtained through static tests of their tensile strength, hardness, etc. Generally, high tensile strength and ductility are preferred. However, when small stresses within proportional limits are applied repeatedly (even though not amounting to destructive forces in static tests), they may cause rupture in the alloy or, at least, cause it to lose its original mechanical properties. This phenomenon is called metal fatigue. It is estimated that the intraoral stress loads received by dental restorations during mastication or during insertion and removal of appliances are repeated more than 3 x 10(5) times/year. From this standpoint, it may be more appropriate to estimate the fracture strength of such dental alloys based on the fatigue properties of the restorative materials used for clasps, bars, and fixed bridges. For this reason, it is necessary to obtain data through fatigue tests on the fatigue strength and the fatigue endurance limits of dental alloys, and it is important to find a correlation between these data and the static data on tensile strengths and ductility obtained by tensile tests. Two alloys are used in these experiments. Both wrought specimens and cast specimens of 12% Au-Pd-Ag and Type III gold alloy were prepared for the fatigue tests. The size of the rectangular wrought specimens was 3 x 4 x 110 mm. The 12% Au-Pd-Ag alloy was heated to 800 degrees C for 15 minutes, quenched, and reheated to 400 degrees C for 20 minutes and quenched again according to the manufacturer's instructions for heat treatment. The Type III gold alloy was heated to 700 degrees C for 10 minutes, quenched, and reheated to 350 degrees C for 20 minutes and quenched again. The cylindrical cast specimens were 60 mm long and 2 mm in diameter. They were invested by conventional methods and cast in a centrifugal casting machine, Thermotrol Model 2500. The four point bending test for the wrought specimen was performed with a Universal Fatigue testing machine, Shimazu UF-15 at a stress amplitude rate of 30 Hz. The cylindrical cast specimens were tested in cyclic tension in a Hydraulic IC Servo Machine, Instron Model 8501 at a gauge length of 25 mm and a stress amplitude of 10 Hz. The tensile tests for both wrought and cast specimens were performed with a Universal Testing Machine, Instron Model 1125 and measured at a cross-head speed of 1 mm/min.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"27 4","pages":"1017-27"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13634367","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}