Aichi Gakuin Daigaku Shigakkai shi最新文献

{"title":"[An application of electrochemical detector to dental pharmacology].","authors":"J Sakai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The electrochemical detection (ECD) is highly sensitive and can distinguish selectively electrochemically active materials. A sensitive and selective ECD is widely used for high-performance liquid chromatography (HPLC) of phenolic compounds, such as catecholamines, indoleamines and phenolic steroids in biological materials. In the present study, the HPLC/ECD system was applied for the simultaneous determination of various dental drugs, such as phenol, guaiacol, m-cresol, o-chlorophenol, p-chlorophenol, m-chlorophenol, eugenol, pyrogallol and resorcin. As a compromise between sensitivity and stability, the applied voltage was set at 1.2 V vs the reference electrode. These drugs were rapidly and selectively separated on a reversed-phase column using 10 mM acetate buffer (pH 4.0)-methanol (7:3, v/v) as a mobile phase. The detection limits of these drugs were determined to be 0.25 pmol per injection. These results imply that the HPLC/ECD method should be capable of determining these dental drugs with high sensitivity. The ECD was also applied to determine the enzyme activity. A highly sensitive and specific assay for alkaline and acid phosphatases and N-acetyl-beta-glucosaminidase in biological materials, such as plasma, saliva and bone, has been established. Phenol, formed enzymatically from the substrate, was determined by HPLC/ECD. The retention time of phenol was 7 min and no other peaks were observed. The method is rapid and sensitive with a detection limit for phenol of as little as 0.5 pmol. Thus, as little as 0.5 microliters of rat plasma or 10 microliters of human saliva is all that is required for both alkaline and acid phosphatase assays. The assay is accurate and reproducible. Using this assay, alkaline and acid phosphatase activities in human saliva and in rat saliva elicited by pilocarpine and isoproterenol were determined. It will be possible to apply this new assay method to extremely small biological samples. Thus, the application of the HPLC/ECD system to determine dental drugs and enzyme activity with high sensitivity should prove to be of great value in the field of dental pharmacology.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"509-23"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289525","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":"[Treated case with horizontally impacted mandibular first molar caused by submerged primary molar].","authors":"K Miyajima,&nbsp;K Shirakawa,&nbsp;K Tanida","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A case is here presented in which mandibular first molar was horizontally impacted under the submerged primary molar. The patient was an 8 year-old-boy referred from a general dentist through the Department of Pedodontics in this hospital, whose chief complaint was a horizontally impacted mandibular first molar. Skeletally, diagnosis revealed an Angle Class II Division 2 malocclusion. The impacted first molar was uprighted with a lingual arch and a utility arch following the extraction of the submerged primary molar. The submerged primary molar was probably ankylosed causing a locking of the first molar which rotated as the root formed. The result of rotation during forming twisted the roots of the first molar, which will make root canal treatment difficult if the pulp is infected in the future. It may concluded that dental arches should be carefully observed even in the deciduous dentition.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"251-7"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289679","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 treatment of adults with periodontal disease].","authors":"K Tanida,&nbsp;K Nagahara,&nbsp;T Iwata","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Orthodontic treatment has diversified in recent years along with progress in other dental specialties. Adult orthodontic treatment has become more popular as patients appreciate the need for a higher level of oral health accompanied with progress in orthodontic objectives and treatment methods. At the same time, patients with periodontal disease in number every year. Recently, two adult females with periodontal disease, one with crowding (20 y 1 m at her initial visit) and the other with bimaxillary protrusion (34 y 9 m at her initial visit), obtained good occlusion and periodontal health through orthodontic treatment. As a result of free mandibular movement by applied mild orthodontic forces and balanced occlusion, infrabony defects improved to achieve a higher level of the alveolar crest.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"525-34"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289526","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":"[The effect of experimental traumatic occlusion on the mandibular condyle in rats].","authors":"K Kondo","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of the present study was to investigate histologically and histometrically the effect of experimental unilateral traumatic occlusion (right side) on the mandibular condyle in rats. 1. Histological findings of the periodontal tissues. i. Group A (Control Group) Periodontal tissues of the right mandibular first molar: Throughout the entire experimental period, a normal structure was observed. ii. Group B (1 mm Group) Periodontal tissues of the right mandibular first molar: At 1 and 2 weeks, resorption of the dentin and cementun, irregular arrangement of the periodontal fibers, resorption of the alveolar bone, and widening of the periodontal space were observed. At 3 and 4 weeks, these changes were gradually repaired. At 8 weeks, the changes were almost repaired except the change of the alveolar bone. Periodontal tissues of the left mandibular first molar: Throughout the entire experimental period, no changes were found. iii. Group C (2 mm Group) Periodontal tissues of the right mandibular first molar: At 1 and 2 weeks, resorption of the dentin and cementum, irregular arrangement of the periodontal fibers, necrosis of the periodontal ligament, resorption of the alveolar bone, and widening of the periodontal space were observed. These changes were more marked than those of the same molar in Group B. From 3 to 8 weeks, the changes were similar to those of the same molar in Group B. Periodontal tissues of the left mandibular first molar: Throughout the entire experimental period, no changes were found. 2. Histological and histometrical findings of the mandibular condyles. i. Group B (1 mm Group) Right mandibular condyle: The layers of differentiation and hypertrophy showed a marked decrease in thickness and cellularity at 4 and 8 weeks. The layer of cartilage decreased significantly in thickness at 4 and 8 weeks (p less than 0.01). The cancellous bone showed a marked widening of bone marrow spaces at 4 and 8 weeks. It also decreased significantly in volumetric density at 4 and 8 weeks (p less than 0.01 or p less than 0.05). Left mandibular condyle: The layers of differentiation and hypertrophy showed a marked decrease in thickness and cellularity at 4 and 8 weeks. The layer of cartilage decreased significantly in thickness at 4 and 8 weeks (p less than 0.01). ii. Group C (2 mm Group) Right mandibular condyle: The layer of articular surface showed a marked decrease in cellularity at 1, 2, 3 and 8 weeks. It also decreased significantly in thickness at 1, 2, 3 and 8 weeks (p less than 0.05).(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"123-57"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289780","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 on the dental traits and crown sizes of Japanese children].","authors":"Y Kondoh","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of this study was to clarify the relationship between crown size and crown form of deciduous teeth. The materials used in this study were 1063 shed or extracted deciduous teeth of Japanese children that were identified according to the individual's name, sex and age. These deciduous teeth were classified as to each developmental stage of the dental traits appearing on the crown, and were measured for the mesiodistal crown diameter and labio (bucco) lingual crown diameter. The results obtained were summarized as follows. 1. Tooth size i. For the upper deciduous teeth, the mean values of the tooth sizes (mesiodistal crown diameter and labio (bucco) lingual crown diameter) decreased in the order of V, IV, III, I and II with the exception of mesiodistal crown diameter in girls which decreased in the order of V, IV, III (which was equal to I in size) and II. For the lower deciduous teeth, the mean values of the tooth sizes (mesiodistal crown diameter and labio (bucco) lingual crown diameter) decreased in the order of V, IV, III, II and I. ii. The coefficients of covariation had a tendency to be larger in deciduous anterior teeth than in deciduous molars and were especially large in upper and lower deciduous lateral incisors in the mesiodistal crown diameter and in lower first deciduous molars, lower deciduous lateral incisors and lower deciduous canines in the labio (bucco) lingual crown diameter. iii. The mean values of tooth size (mesiodistal crown diameter and labio (bucco) lingual crown diameter) had a tendency to be larger in boys than in girls. Sexual size differences were significant in upper deciduous canines (mesiodistal crown diameter and labio (bucco) lingual crown diameter) and lower deciduous second molars (bucco lingual crown diameter). 2. Frequency of dental traits i. Shovel shaped teeth were found in 83.5% of the upper deciduous central incisors, 91.8% of the deciduous lateral incisors, 29.6% of the deciduous canines and 46.1% of the lower deciduous central incisors, 45.5% of the deciduous lateral incisors, 40.7% of the deciduous canines. ii. Crown surface patterns of the upper deciduous molars: Type 3 in the first deciduous molars and type 4 in the second deciduous molars were found much more frequency.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"159-94"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289781","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 postsoldering of Ni-Cr ceramic alloys. Effect of soldering temperature and atmosphere].","authors":"K Ishigure","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The effects of soldering temperatures and atmospheres on tensile strength of solder joints were investigated for two types of Ni-Cr ceramic alloys and one type of gold solder for postsoldering. Each alloy and the gold solder were soldered with fluoride flux in an electric furnace in three different temperatures and four different atmospheres. Of the three different temperatures, one was just over the liquidus point of the solder, another 50 degrees C higher than the liquidus point and the other 100 degrees C higher than the liquidus point. Of the four different atmospheres, one was under vacuum, another under vacuum with a 6 l/h argon gas flow, another under vacuum with a 12 l/h argon gas flow and the other under vacuum with a 24 l/h argon gas flow. Tensile strength testing was performed at the solder joints. The fracture surface was observed by EPMA. Wettability of the liquid solder on each alloy was performed by the sessile drop method in high-purity argon gas. The surface tension and the contact angle of the liquid solder on MgO were determined by the sessile drop method in high-purity argon gas. The soldering was performed in the furnace used for the sessile drop method in high-purity argon gas. The results are summarized as follows. The tensile strength of UNI METAL-solder joints was significantly affected by the soldering temperature (p less than 0.01). However, the effect of the soldering atmosphere on the tensile strength was small. The effect of the soldering temperature and atmosphere on the tensile strength of Victory II-solder joints was small. Each alloy had a different adequate soldering temperature. With the increase in the soldering temperature, the diffusion layer of the solder joint interface increased, but no correlationship between the atmosphere and the diffusion layer thickness was observed. Fracture patterns of UNI METAL-solder joints were mixed adhesive-cohesive fractures with a large cohesive area. Fracture patterns of Victory II-solder joints were mixed adhesive-cohesive fractures with a large adhesive area. It was possible to perform the soldering without flux in the furnace used for the sessile drop method in a strictly controlled atmosphere of high-purity argon gas. Wettability of the liquid solder on UNI METAL was better than on Victory II. The surface tension of the solder used was 505.9 dyn/cm at 1000 degrees C. The contact angle of the solder used was 163.0 degrees at 1000 degrees C.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"21-41"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13142563","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 formalin-creosote on the rat periapical tissues after pulpectomy].","authors":"M Yamasaki","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of the present study was to investigate histologically, histometrically and immunohistochemically the effect of formalin-creosote (FC) on the periapical tissues after pulpectomy in rats. Experiment I. Seventy-five rats were divided into 3 groups. In all Groups, the mesial root of the right mandibular first molar was removed. After pulpectomy, in Group A, a paper point containing saline was inserted into the root canal. In Group B, a paper point containing FC was inserted, whereas, in Group C, FC was applied and then a paper point containing FC was inserted. The access cavity was sealed with amalgam. The animals were killed at 1, 3, 7, 14 and 28 days. The periapical tissues were examined histologically. The vertical length and the area of the apical periodontal ligament were measured histometrically. The inflammatory cells and the fibroblasts per unit area in the apical granulation tissue were counted. Experiment II. Eighteen rats were divided into 3 groups. In all Groups, pulpectomy was performed as in the experiment I. In Group a, a paper point containing saline was inserted into the root canal. In Group b, a paper point containing FC was inserted, whereas, in Group c, FC was applied and then a paper point containing FC was inserted. The animals were killed at 14 and 28 days. The presence of macrophages in the granulation tissue was examined using polyclonal antibody to lysozyme immunohistochemical techniques. The results were as follows. Experiment I. Histologically, in Group A, severe inflammation was observed in the periapical tissues at 1 and 3 days. Inflammation became moderate and fibrous tissue proliferation was observed in the periapical tissues at 7 days. Inflammation became slight and fibrous tissue increased at 14 and 28 days. In Group B, severe inflammation was observed in the periapical tissues at 1 and 3 days. Inflammation became moderate at 7 and 14 days. Resorption of alveolar bone was observed after 7 days. Fibrous tissue proliferation and resorption of the apical root were seen after 14 days. Inflammation became slight at 28 days. In Group C, severe inflammation was found in the periapical tissues at 1, 3 and 7 days. Resorption of alveolar bone was seen after 7 days. Moderate inflammation remained and fibrous tissue proliferation was seen at 14 and 28 days. Resorption of the apical root was observed after 14 days. Histometrically, vertical length and area of the apical periodontal ligament in Groups B and C increased significantly compared with those in Group A at 14 and 28 days.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"435-59"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288960","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 lipopolysaccharide on biological properties and induction of alveolar bone resorption in rats].","authors":"E Maki","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A study was made on the effects of lipopolysaccharides (LPS) from Escherichia coli and Actinobacillus actinomycetemcomitans on mitogenic response and the release of calcium from mouse calvaria. LPS exhibited significant mitogenic activity on mouse spleen cells, and increased the release of calcium from mouse calvaria in vitro. The effect of LPS from E. coli on alveolar bone resorption in Wistar male rats was also studied. LPS was infused by an Alzet miniosmotic pump that was implanted subcutaneously on the backs of the rats. A catheter connected to the pump was brought up to the maxillary right second molar using a nylon ligature. In this way the rats were continuously infused for 7 days with LPS. Alveolar bone loss was measured by an image-analyser (Nexus 6411). Rats stimulated by LPS exhibited significant alveolar bone loss, but bone loss was not observed in rats stimulated by saline. Polymyxin B effectively inhibited the LPS-stimulated bone resorption.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 2","pages":"283-94"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288954","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 1,25-dihydroxyvitamin D3 on mineralization of incisor dentin in parathyroidectomized rats].","authors":"M Yamaguchi,&nbsp;M Yoshida,&nbsp;H Takei,&nbsp;H Matsui,&nbsp;S Matsumoto","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Male Wistar rats (8 weeks old) were parathyroidectomized (PTX) and given daily subcutaneous injections of different doses (0, 25, 50 or 100 ng/kg) of 1,25 (OH)2D3 for 13 days. Changes in plasma calcium and phosphorus levels were monitored at 3 day intervals. An appositional rate of dentin was estimated by a time marking method; that is, the distance of two lead lines deposited in a transverse section of the incisor dentin on the 9th and 12th days of the experimental period was measured. The plasma calcium levels that had been lowered by PTX were elevated dose-dependently following injections of the drug, but the plasma phosphorus levels that had been elevated by PTX were lowered. The body weight was not affected by the administration of the drug. However, the values for the dry weight and ash weight, and the calcium and phosphorus contents of the upper incisors increased dose-dependently. The mineralization of the dentin, that had been suppressed by PTX, also recovered dose-dependently. Apposition rates of the dentin in groups of rats given various doses of the drug (25, 50 and 100 ng/kg/day) averaged 46, 61 and 69 microns/3 days respectively. There was a significant correlation between the apposition rate of the dentin and the plasma calcium level. The correlation coefficients were estimated to be 0.956 (y = 17.2 + 4.6 chi, p less than 0.001) on the lingual aspect and 0.941 (y = 11.4 + 5.3 chi, p less than 0.001) on the labial aspect. However, the values for the mineralization of incisor dentin were inversely proportional to the plasma phosphorus levels. These results indicate that the stimulating effect of 1,25 (OH)2D3 on the mineralization of the dentin in PTX rats is primarily dependent upon the increase in plasma calcium levels by the hormone. The direct effect of 1,25 (OH)2D3 on the mineralization of dentin could not be demonstrated in this experiment.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"241-50"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289678","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 on interdental spaces of the deciduous dental arch in Indian sample].","authors":"N Ohno,&nbsp;K Kashima,&nbsp;T Sakai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The primate spaces are described as a genetic characteristic of all primate dentitions. In homo sapiens, they are limited to the deciduous dentition. We have now investigated the prevalence of primate spaces and interdental spaces in the deciduous dentition by sex and arch in samples from Indian children and the relationship between these spaces and other morphological characteristics of the deciduous dental arches. The samples were taken from 55 school children, 26 males and 29 females aged 5-7 years, belonging to the middle class of socio-economic status and living in New Delhi. The samples were taken during January of 1988. All were free of dental malformations, extractions or caries and a certain children had erupted permanent first molars. The result were as follows: 1. There was a wide variation in the pattern of the interdental spacing. The most common areas of spacing were mesial to the maxillary primary canine (primate spaces) and mesial to the mandibular primary canine (developmental spaces) for all ages. The mandibular primate spaces were considerably less frequent than the maxillary ones. The prevalence of primate spaces and developmental spaces were higher in the maxillary deciduous arch than in the mandibular deciduous arch. 2. Frequent distribution of the occlusal termination type were found to be more variable. The bilateral vertical terminal plane was found in about 50% at ages 5 to 6 of both sexes. The vertical terminal occlusal pattern existed even in the deciduous arches in which the first permanent molars had erupted. 3. The mesiodistal crown diameters of each deciduous tooth were greater in males than in females. The sex differences in mesiodistal crown diameters were significant for mandibular second deciduous molars. The sum of mesiodistal crown diameter in the closed deciduous arches was larger than in the spaced deciduous arches. 4. The dental arch increased slightly in width but decreased a little in length with changes in age during the deciduous dentition period. The deciduous arch diameters in the spaced arches were larger than in the closed arches. Statistically significant differences were found between the spaced arches and the closed arches for the mandibular anterior or posterior arch lengths and the anterior arch width for both arches. Generally, spacing of the deciduous arches was significantly related to the mesiodistal crown diameter, intercanine width and intermolar width, but there was no significant relationship to the eruption of the permanent first molars.</p>","PeriodicalId":75458,"journal":{"name":"Aichi Gakuin Daigaku Shigakkai shi","volume":"28 1 Pt 1","pages":"79-91"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289683","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}