Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society最新文献

{"title":"[Longitudinal observation of condylar position in anterior crossbite at the mixed dentition during orthodontic treatment].","authors":"N Iijima,&nbsp;E Motegi,&nbsp;Y Kuboki,&nbsp;H Miyazaki,&nbsp;H Konishi,&nbsp;M Sebata","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We investigated the condylar position by transcranial radiography which can be put daily clinical use easily. The patients are 8 anterior crossbite at the mixed dentition (4 functional crossbite and 4 skeletal crossbite). We observed their condylar positions before treatment (average age is 9.3 years old), after correction of overbite (average age is 10.0 years old) and 3-4 years after correction of overbite (average age is 14.0 years old). The results were as follows: 1. Condylar position of 7 cases changed after correction of overbite. The differences between right and left condylar position of six in seven cases had been recognized before treatment decreased after correction of overbite. Their condylar position were stable during the observation period of 3-4 years after correction of overbite. The condylar position of the other one case closed to fossa and then relapsed 3-4 years later. 2. Condylar position of only one case hasn't changed during the observation. 3. In functional crossbite cases, there were some differences between right and left condylar position before treatment, but no differences after crossbite correction. In skeletal crossbite cases, there was no tendency of the changing on their condylar position through treatment. 4. The changing to same direction was observed in the decrease of differences on condylar position and in the result of frontal cephalogram analysis. 5. There wasn't special relationship between changing of condylar position and orthodontic appliances. 6. TMJ dysfunction was observed in the case which has significant difference in its condylar positions before treatment and in the other case in which difference was not corrected after treatment. We recognized the usefulness of transcranial radiography for orthodontic treatment.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"263-75"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288118","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 PTH and periodic tension on osteoblast-like cells for collagenase synthesis].","authors":"K Miyajima","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of the present study was to determine whether cyclically applied tension stimulates osteoblast-like cells to produce collagenase as well as parathyroid hormone (PTH) does. Experimental evidences suggest that osteoblast growth can be altered by various extrinsic control factors, including continuous and intermittent mechanical forces. In the present study, morphological change and collagenase synthesis were observed for both cultures that were added PTH and under the periodic tension condition applied on osteoblast-like cells and their parallel controls. periodic tension was used because it was thought to more closely mimic the in vivo functional situation. An initial seeding density of 50,000 cells/well was used for both the PTH stimulated and mechanically stimulated cells and their controls. For the mechanically stimulated cultures, the cells were subjected to the following tension/relaxation combination; 3 cycles/minute at 17% elongation of tensional force. The cells were fixed at 24, 72, and 120 hours after the start of experiments and collagenase was stained immunohistochemically. The following results were obtained: 1. PTH stimulated collagenase production from the first through the fifth day; 2. Periodic tension changed cell morphology from round to stellate; and 3. Periodic tension increased collagenase production from the first through the fifth day.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"218-25"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13125961","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":"[Changes of frontal facial form occurred after correction of anterior reversed occlusion in children with TMJ dysfunction].","authors":"H Fukazawa,&nbsp;N Endo,&nbsp;S Kurita,&nbsp;H Mitani","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of this study was to investigate the facial pattern of early childhood patient with temporomandibular joint (TMJ) dysfunction (clicking) occurred after anterior cross-bite correction. Chin cap appliance was engaged in all cases, with or without minor intraoral mechano-therapy. Materials were consisted of postero-anterior cephalograms of 50 Japanese patients (6-9 years old), all showing anterior cross-bite with normal function of TMJ at pre-treatment stage. They were consisted of two groups, one was the group of 22 patients with TMJ dysfunction occurred after cross-bite correction and the other was the control group of 28 patients with no TMJ problem. Morphological measurements were done and compared between two groups at pre-treatment stage and after cross-bite correction stage. The results were as follows: 1. In many cases, the TMJ dysfunction was found at about 6 months later after anterior cross-bite correction. 2. It was cleared that the facial pattern of the TMJ dysfunction group showed asymmetry at pre-treatment stage and the same trend of asymmetry pattern continued after cross-bite correction. In conclusion, it was suggested that the TMJ dysfunction tends to occur in mandibular asymmetry patients after cross-bite correction stage because of the dynamic changes of occlusion and mandibular position.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"199-206"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288112","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":"[Experimental study of the trajectories of the upper first molar with extraoral force. Practical measurement of the movements in the three planes by a magnet-magnetic sensing system].","authors":"N Yoshida","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The upper first molar trajectory under the loading of extraoral force was studied in human subjects. The five loading directions, that is horizontal, upper, lower, high-pull and cervical were tested. Using a magnet-magnetic sensing system, the rectilinear and rotational movements were traced in the three planes, i.e. sagittal, frontal, and horizontal planes. It was concluded; 1. The molar inclined buccally with the loading in all the applied directions. 2. New evidence was found in the horizontal plane, i.e. the molar rotated mesially with the loading in the lower direction. The rotation may depend on the direction of the loop at the terminal of the inner-bow. Therefore it was suggested that the form of the loop affected the molar movements. 3. With the loading in the horizontal direction, the distal movement of the molar was evident and small displacement was observed in the extruded direction. 4. Loading both in upper and lower directions, the rotation of the molar was more evident than the rectilinear displacement. It was suggested that these loading would not be applicable to control the tooth in the rectilinear movements. 5. With the high-pull loading, the molar inclined mesially and shifted distally a little. On the other hand, it was greatly intruded. The results suggested that effective distal and intrusive movements would be expected by bending the outer-bow downward, since this procedure would prevent the tooth from tipping mesially. 6. The loading in the cervical direction caused large distal movement of the molar. Extrusion was also evident as it was expected from the loading direction.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"207-17"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288113","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":"[An evaluation of 3-dimensional position of mandibular condyle to glenoid fossa using tomogram: an analytical technique and its clinical application].","authors":"H Takasugi,&nbsp;M Tsuchiya,&nbsp;E Tanaka,&nbsp;Y Koh,&nbsp;Y Takeuchi,&nbsp;K Tanne,&nbsp;M Sakuda","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In recent years, temporomandibular disorder (TMD) is occasionally found among orthodontic patients and has become a great concern in orthodontics. From this point of view, a certain technique has been hopefully anticipated for diagnosis and treatment planning. The purpose of this study was to develop a new method for evaluating three-dimensional position of the mandibular condyle relative to the glenoid fossa and also to investigate its clinical application. Seven-layered tomograms were taken and contours of the condyle and glenoid fossa were traced on an acetate paper. These contours were entered into a personal computer by use of a digitizer and were equally divided into 9 parts for the condyle and 15 parts for the glenoid fossa, consisting of 10 and 16 points on the contours of condyle and glenoid fossa. Three-dimensional configuration of the TMJ was thus constructed by 108 triangles for the condyle and 180 triangles for the glenoid fossa. The shortest distance between the condyle and the glenoid fossa (CGFD) was then calculated along a perpendicular line to center of gravity of a triangle on the condyle. For evaluating the position of the condyle to the glenoid fossa easily in a three dimensional space, surface of the condyle was divided into five areas, i.e. anterior, posterior, middle, lateral and medial areas. In order to investigate whether or not the CGFD is accurate enough to identify the distance between surface of the condyle and glenoid fossa, a model of hemi-spherical solid shell was made, of which the thickness is 3.0 mm. Tomograms of the model were taken to analyze the thickness. Direct measurement of the same area was also made by calipers. Two means were approximately 3.0 mm, which is the thickness itself and no significant differences were indicated at 5% level of confidence. The present technique was applied to diagnosis of an orthodontic patient with painful clicking as TMD. The analyzed CGFDs were coincident with clinical symptom. It is shown that the present approach provides an availability and a possibility to evaluate positional relationship between the mandibular condyle and the glenoid fossa of patients with TMDs.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"237-46"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288115","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":"[Investigation of the facial symmetry of cases with cross bites needing surgical orthodontic treatment using postero-anterior roentgenographic cephalometrics].","authors":"O Aoshima","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Of the patients who visited the Dental Hospital (Orthodontic Treatment Section), Nihon University School of Dentistry at Matsudo, and received surgical orthodontic treatment for mandibular protrusions (true Class III), 30 (12 with cross bite and 18 without) were selected as study subjects. Postero-anterior roentgenographic cephalometrics were taken of these subjects and, based on these cephalograms, facial symmetry was investigated using an analytical method devised by this study. The results can be summarized as follows. 1. The analytical method is beneficial because it provides a standard for analyzing facial symmetry and it helps to determine if a given part of the face is symmetrically disposed. 2. In this study, the facial symmetry of the cases with cross bites tends to become worse in lower part of the face. This tendency is especially apparent below the plane (JL-JR plane) connecting the intersection where the contour lines of right and left maxillary tuberosities meet the zygomatic alveolar crests. 3. I concluded that surgical orthodontic treatment should be different for cases with cross bites than for those without. For cases without cross bites surgical treatment can be properly planned depending mainly on paper surgery using lateral roentgenographic cephalometrics. For cases with cross bite, however, paper surgery should first be done separately for right and left mandibles using lateral roentgenographic cephalometrics, and paper surgery based on postero-anterior roentgenographic cephalometrics should follow. Finally, combining the results from those three types of paper surgery, overall paper surgery should be done to finish a proper and comprehensive surgical plane.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"256-62"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288117","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 periodic tension on osteoblast-like cells for cell differentiation and alkaline phosphatase activity].","authors":"K Miyajima","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Bone remodeling requires bone resorption and formation. Bone formation involves osteoblastic activity. Both intermittent and continuous mechanical forces have been proved to affect osteoblast differentiation in vivo. It is evident in the present investigation that periodically applied tension alter cell division, protein synthesis and alkaline phosphatase activity. An initial seeding density of 50,000 cells/well was used for both the mechanically stimulated cells and controls. For the experimental cultures, the cells were subjected to different levels of tension applied at different frequencies; 1. Low frequency (0.3 cycles/minute) at moderate tension (17% elongation); 2. Moderate frequency (3 cycles/minute) at moderate tension (17% elongation); 3. High frequency (30 cycles/minute) at moderate tension (17% elongation); 4. Low tension (9% elongation at moderate frequency (3 cycles/minute); 5. High tension (22% elongation) at moderate frequency (3 cycles/minute). Cell numbers, protein synthesis and alkaline phosphatase activity were measured for each treatment combination, as well as for the unstressed controls. The cells were harvested at 24, 72, and 120 hours after the start of force application. Analysis of variance revealed that periodically applied tension stimulated cell activity in cultured UMR 106-01 cells: 1. Seventeen percent elongation at 3 and 30 cycles/minute was the optimum condition for stimulating osteoblastic cell division; and 2. High frequency stimulation at moderate tension and high tension at moderate frequency stimulated alkaline phosphatase activity. Given these findings, the following conclusions seem warranted: 1. There may be an optimal magnitude of tensional force that stimulates osteoblast activity. Beyond this optimal level, osteoblasts may lose potential to have cell divisions; 2. The optimal condition of tension might be different for cell division and other cell functions. Although high tension (22% elongation) did not stimulate cell division, alkaline phosphatase activity showed significantly high measurement at this condition; and 3. in the light of both the present study and previous investigations, periodically applied tension may stimulate both collagenase (a parameter of bone resorption) and alkaline phosphatase (a parameter of bone formation) production.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"226-36"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288114","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 dynamics of orthodontic archwire on the dental arch. 1. Distribution of orthodontic forces during labial movement of bilateral incisors].","authors":"H Noma,&nbsp;K Fukai,&nbsp;K Oikawa,&nbsp;M Moriwaki,&nbsp;S Namura","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The study on labial movement of maxillary unilateral incisor had been reported previously. This study was the case of maxillary bilateral incisors. Orthodontic forces during labial movement of maxillary bilateral incisors which were produced by stainless steel archwire with vertical loops and nickel titanium archwire, were measured and were examined the distribution of orthodontic forces to the dental arch in the experimental apparatus with strain gauges. The following results were found: 1. In nickel titanium archwire, orthodontic forces were distributed to the entire dental arch, and the distribution of orthodontic forces could be classified into three types, which were similar to the previous study. 2. In stainless steel archwire with vertical loops, orthodontic forces were distributed only to bilateral incisors and adjacent tooth to bilateral incisors. 3. When bilateral incisors displaced lingually, it showed that there were additional orthodontic forces distributions as if two unilateral distributions were overlapped. 4. For maxillary bilateral incisors were moved in optimum force, some consideration to adjust the loops of stainless steel archwire was needed.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"247-55"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288116","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 application of repelling magnets to distal movement of maxillary molars. Report of three cases].","authors":"T Tokuda,&nbsp;T Itoh,&nbsp;K Kamogashira,&nbsp;M Kanaya,&nbsp;S Kiyosue,&nbsp;M Matsumoto","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Report on three cases of maxillary first molar distalization with the aid of intra-arch repelling magnets were presented in this paper. Two cases were Class II malocclusion and one was a Class I discrepancy case whereby all resulted in rapid distalization of the upper first molars into Class I molar relationship in a relatively short time. Despite the unwanted rotation and tipping of the molars and the anteriors occurred slightly, numerous advantages of the repelling magnetic system were noted applicable to early mixed dentition cases to obtain the sufficient space of the molars rapidly. Moreover, since this is a fixed appliance, no patient cooperation was necessary. In conclusion, this magnetic system was found to be an effective device for molar distalization.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"276-81"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288001","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 serial study on the development of the temporomandibular joint in the fetal mouse--in particular on the fibrous component in the condylar cartilage.","authors":"M Kagawa","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The development of the temporomandibular joint of 400 fetal mice at stages ranging from the 13th to the 20th day after insemination was investigated under the light, scanning (SEM) and transmission electron (TEM) microscopes. The differentiation and development of a cartilaginous tissue were observed at the supero-posterior end of the mandible at the 13 days after insemination. This tissue grew backward, upward and lateralward continuously and maintained a constant articulation with the squamosal part of the temporal bone. Seventeen days after insemination, cell layers in the condylar process and articular disc were arranged regularly. An supero- and inferno-directional cellular differentiation initiated from the subfibrous (SF) layer toward the articular spaces and cartilaginous layer was observed. The perichondrial ossification had taken place with the invasion of capillaries and the differentiation of osteoblasts in the SF layer, and was followed with a hypertrophic degeneration and endochondral ossification in the condylar process. Such a bi-directional growth of collagen and elastic fibers starting from the SF layer was also observed. Observation under SEM and TEM on the autoclaved condylar process revealed a complicated network consisted of main elastic fibers running in the sagittal direction. These fibers as well as the proteoglycan which contributes to the resilient property of the condylar cartilage and the ability to endure tensile or compressive stress from surrounding tissues during the growth and development of the mandibular condyle. The developing cartilaginous tissue was stimulated with the pressure from the masticatory muscles to initiate an active differentiation of the fibrous layer, which was invaded by the blood capillary system closely related with the subsequent endochondral ossification. These results elucidate that the development of the temporomandibular joint has closely kept relations with the functional influences from surrounding tissues, which also play an important role in regulating postnatal growth of the mandible.</p>","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 3","pages":"187-98"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288111","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}