Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society最新文献_第2页

[On eruption of mandibular third molar after extraction of mandibular first or second molar]. [下颌第一或第二磨牙拔除后第三磨牙的萌出]。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

K Yamabe, M Kouguchi, Y Watanabe, K Yamauchi

{"title":"[On eruption of mandibular third molar after extraction of mandibular first or second molar].","authors":"K Yamabe, M Kouguchi, Y Watanabe, K Yamauchi","doi":"","DOIUrl":"","url":null,"abstract":"In the orthodontic practice, the first or second molars are extracted by reason of a necessity based on the treatment planning. In these cases, it is desirable that the third molar would be taken part in the masticatory function. This study was made to investigate the natural movement of the erupting third molars after the extraction of the first or second molar on the serial lateral cephalometric radiographs and orthopantomographs. Subjects were divided into three groups. The first is the group which the mandibular second molars were extracted. The second is the group which the first molars were extracted bringing about the successful eruption of the third molars. The third is the group which the first molars were extracted with resultant in the failure of the third molar eruption. In all cases, the orthodontic forces were not applied to the third molars. The results were as follows: 1. In the first group, all third molars were successfully erupted and a lot of the spaces after the extraction of second molars were utilized for the eruption of third molars. 2. In the second group, all third molars were successfully erupted and a lot of the spaces after the extraction of first molars were utilized for the mesial movement of the second molars. 3. In the third group, there were various patterns of the impaction of the third molars. It was suggested that the eruption of the third molar was related to the space distal to the second molar but it was not related to the anterio-posterior length of the mandibular body significantly.","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 4","pages":"302-13"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288003","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}

引用次数: 0

[Tooth movement of an impacted lower 2nd premolar in the root developmental stage--a follow-up radiographic observation on the root formation]. [根发育阶段阻生下第二前磨牙的牙齿运动——根形成的后续x线观察]。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

N Ohya, T Ohya

{"title":"[Tooth movement of an impacted lower 2nd premolar in the root developmental stage--a follow-up radiographic observation on the root formation].","authors":"N Ohya, T Ohya","doi":"","DOIUrl":"","url":null,"abstract":"A 9 year old girl presented an impacted lower right 2nd premolar which not only was in horizontal position, but its crown was directed lingually. As a lower right 2nd premolar was in such a position that normal eruption was impossible, the deciduous predecessor was extracted at 9 years of age, and then sufficient space had been created for the lower right 2nd premolar to be erupted, and the eruption of it was observed for about 2 years. 2 years later, radiographic indication showed that no spontaneous eruption of a lower right 2nd premolar was to be expected. At 11 years of age, surgical exposure and traction of a lower right 2nd premolar was attempted. When the lower right 2nd premolar was upright, its root formation was in the 1st stage of root developmental stages according to Moorrees et al. Follow up radiographic observations on surgical exposure and traction of a lower right 2nd premolar 3 years later revealed the following results: 1. The root development went on to amount to about 90 percent of the root formation of the other tooth concerned without the curvature of the root. 2. Lamina dura and periodontal space were normal. The continued root formation was narrowing the root apex and the pulpal tissue of apical foramina was continuous with the periodontal space surrounding the root. 3. Bone deposition occurred at the alveolar crest and the latter was recontoured normally. The interdental and inter-radicular trabecula were good. As based on these results, normal development of the root of a lower right 2nd premolar with normal periodontium can be anticipated. Clinically, the lower right 2nd premolar had completely erupted and was in normal position on the arch and in occlusion. Color, vitality and mobility were normal. Periodontal support was good. The above-mentioned findings give support to the possibility that \"early treatment\" enables the impacted tooth to correct.","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 4","pages":"379-91"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288553","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}

引用次数: 0

[Clinical investigation of orthodontic treatment of palatally impacted canines, using ballista spring appliance]. [ballista弹簧矫治器治疗腭阻生犬的临床研究]。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

S Umemura, T Yamaguchi, K Suginome, S Nishiguchi

引用次数: 0

Effect of micro-pulsed electricity on experimental tooth movement. 微脉冲电对实验牙齿运动的影响。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

H Hashimoto

{"title":"Effect of micro-pulsed electricity on experimental tooth movement.","authors":"H Hashimoto","doi":"","DOIUrl":"","url":null,"abstract":"The purpose of this study was to determine whether a micro-pulsed electrical potential on the tooth surface could induce effective remodeling of the alveolar bone and enhance tooth movement. Twenty-eight cats were divided into 4 groups of 7 animals each for 1, 4, 7, and 14 days of treatment, respectively. A 60 gram orthodontic force was applied to distally tip the maxillary canines. In addition, the left canine only was subjected to a one hertz square wave form of 6 volts which induced a current of about 10 microA. Tooth movement and the amount of newly formed bone for the control and experimental sides were compared statistically using the Student's t test. Histochemical observations were also carried out. The results indicated that when electrical stimulus was applied to the surface of the canines in addition to mechanical force: 1) The periodontal tissue was affected. 2) The teeth moved more rapidly. 3) Wider areas of bone deposition and larger amounts of newly formed bone were observed on the tension side, and the amount of this newly formed bone increased with time. 4) More osteoblasts were observed on the tension side. 5) More tartrate-resistant acid phosphatase (TRACP) positive mononuclear and multinuclear cells were seen on the compression side. These results indicate that micro-pulsed electrical stimulation might play a role in the efficient remodeling of alveolar bone, and in inducing more rapid tooth movement.","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 4","pages":"352-61"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288008","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}

引用次数: 0

[The clinical study on occurrence of TMJ dysfunction in orthodontic patients]. 正畸患者颞下颌关节功能障碍发生的临床研究

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

H Tosa, T Imai, F Watanabe, M Sumori, T Tsuchida, I Matsuno, S Nakamura

{"title":"[The clinical study on occurrence of TMJ dysfunction in orthodontic patients].","authors":"H Tosa, T Imai, F Watanabe, M Sumori, T Tsuchida, I Matsuno, S Nakamura","doi":"","DOIUrl":"","url":null,"abstract":"Occlusal disharmony is considered to be the most significant factor of temporomandibular joint (TMJ) dysfunction, but the relationship between malocclusion and TMJ dysfunction has been unknown yet. The purpose of present study was to investigate the relationship between TMJ dysfunction and occlusal disharmony (eccentric occlusal contacts and functional shift of the mandible) in orthodontic patients. The subjects were 533 orthodontic patients, 209 males and 324 females, who were received at the Department of Orthodontics, School of Dentistry, Hokkaido University from April 1985 to March 1988. Their ages ranged from 8 to 38 years old. All were prior to orthodontic treatment. The results were as follows 1. The prevalence of TMJ dysfunction was 27.6%, 24.9% in males and 29.3% in females. The difference was insignificant between males and females. 2. The patients with TMJ dysfunction increased after 13-15 years old, corresponding to dental age IV A (Hellman's classification). 3. In patients with TMJ dysfunction, the highest frequency of symptom of TMJ dysfunction was joint sounds (77.6%), the second was pain (22.4%), the third was disturbance of mandibular movement (4.8%). The complication of those symptoms were compounded in 26.3% of the total patients. 4. The prevalence of TMJ dysfunction had no relation to specific malocclusion and maxillofacial morphologic characteristic. 5. Most patients with TMJ dysfunction had occlusal disharmony (95.9%). 6. Eccentric occlusal contacts were found most frequently in patients with open bite and functional shift of the mandible was found most frequently in patients with deep bite. From these findings, the prevalence of TMJ dysfunction was frequent in orthodontic patients, however the symptoms were objective and the patients were not aware of TMJ dysfunction. TMJ dysfunction had no relation to specific malocclusion but some kinds of occlusal disharmony were easy to occur in specific malocclusion and TMJ dysfunction was induced by those etiological factors.","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 4","pages":"341-51"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288007","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}

引用次数: 0

[Three-dimensional morphological analysis for craniofacial deformity]. [颅面畸形的三维形态学分析]。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

I Matsuno, M Kawakami, M Yamamura, H Ishikawa, A Kudou, S Nakamura, O Takamichi, N Ohhata, Y Uchiyama, T Ohura

{"title":"[Three-dimensional morphological analysis for craniofacial deformity].","authors":"I Matsuno, M Kawakami, M Yamamura, H Ishikawa, A Kudou, S Nakamura, O Takamichi, N Ohhata, Y Uchiyama, T Ohura","doi":"","DOIUrl":"","url":null,"abstract":"Morphological analysis of the craniofacial deformity has been performed by cephalometric radiography, but even with this method, it is difficult to analyze the cases with complicated deformity. The purpose of the present study is to develop the new 3-D CT morphological analyzing system in order to investigate complicated craniofacial deformity. Using the 67 landmarks, we established the 3 D line drawing method. Then the reproducibility of the landmarks were examined and the clinical cases were investigated. The measurement of landmarks were carried out 10 times by the same operator, and standard deviation of 67 landmarks were calculated. Some landmarks which were difficult to identify showed high value of standard deviation. However, it was almost same value between standard deviation of most of the landmarks and the CT system error. Therefore, location of landmarks in the system were found to be reproducible. This new analyzing system was performed in clinical cases with craniofacial deformity. In such cases, cranium deformity and complicated deformity such as twist-form arrangement of cranium, maxilla and mandible were detected. The 3-D CT morphological analysis is effective for analyzing severe craniofacial deformity which was impossible to recognize with conventional cephalometric analysis.","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 4","pages":"291-301"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288002","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}

引用次数: 0

[Multivariate analysis for the study of craniofacial structure. Selection of parameters on using the principal component analysis]. 颅面结构研究的多变量分析。参数选择上采用主成分分析]。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

K Sato, T Saito, H Mitani

引用次数: 0

[Importance of posterior tooth-to-denture base discrepancy in the development of skeletal open-bite malocclusion]. [后牙-义齿基托差异在骨性开咬错发展中的重要性]。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

S Sato, K Sasaguri, S Kamoi, M Goto, Y Suzuki

引用次数: 0

[Study on the simulation in planning for orthognathic surgery by using a personal computer]. 个人计算机模拟正颌手术规划的研究

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

K Terada, I Saitoh, K Hanada

{"title":"[Study on the simulation in planning for orthognathic surgery by using a personal computer].","authors":"K Terada, I Saitoh, K Hanada","doi":"","DOIUrl":"","url":null,"abstract":"This study was made in order to develop and evaluate three-dimensional simulation programs in planning for orthognathic surgery by using microcomputer system. Microcomputer system is composed of CPU (NEC, PC-9801), high resolutional color display, color printer, image scanner, and MOUSE. This simulation is composed of four procedures. 1. Data input Three-dimensional coordinate data on tracing obtained from CT films is inputted. One data file is made from one outline of structures. 2. Three dimensional reconstruction A control file is made to arrange data files constructing structures. 3. Simulation This procedure is composed of cutting and movement. The horizontal projection of mandible is displayed. After cutting simulated orthognathic surgery is designed, new data files and new control file are made. A movement consists of parallel translation and rotation. A movement data is combined with movements designed on each of three projections. 4. Three-dimensional graphic display Three-dimensional graphics of the mandible before and after a simulation for orthognathic surgery are displayed by perspective views with treated hidden lines and accurate pictures (COSMOZONE 2SA, NIKON). These simulation programs were carried out with the asymmetrical patient. The simulation was supposed that the operation was combined with sagittal splitting osteotomy of the right mandibular ramus and body ostectomy of the left lower first premolar part. Three-dimensional graphics of the mandible before and after the simulation were presented. Its three-dimensional mandibular position and form after orthognathic surgery were predicted. These three-dimensional simulation programs may be important procedure, when a treatment planning in asymmetrical prognathic case is discussed.","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 4","pages":"331-40"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288006","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}

引用次数: 0

[A study to establish the model of transseptal fibers in vitro by human gingival fibroblast]. [利用人牙龈成纤维细胞体外建立跨隔纤维模型的研究]。

Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society Pub Date : 1990-08-01

S Tenshin, M Tsuchihasi, K Sou, K Sumitani, K Yamaguchi, T Kawata

{"title":"[A study to establish the model of transseptal fibers in vitro by human gingival fibroblast].","authors":"S Tenshin, M Tsuchihasi, K Sou, K Sumitani, K Yamaguchi, T Kawata","doi":"","DOIUrl":"","url":null,"abstract":"The present study was attempted to establish the model of transseptal fibers in vitro to clarify the remodeling mechanisms of the fibers during orthodontic treatment. Human premolars were transversally cut. The thickness of films was 150 microns and a pair of dental rings was placed at intermediate of 500 microns in tissue culture dishes. Human gingival fibroblasts were seeded in these dishes and cultured. Culturing of these cells were changed at 1, 5, 10 and 20 days and used to histological observation. The following results were obtained: 1. It was observed that human gingival fibroblasts and fibrillar materials oriented approximately the surfaces of sliced teeth and extended the process of cells along the direction from sliced teeth to another one. The bridges of cells and fibers between two sliced teeth were completed after 10 days culturing. 2. The fibrillar materials were examined by TEM and bundles constructed from banded fibrils which each band was 60 nm in diameter. The red fibers were stained with Van Gieson's stain method and so many red fibers filled in the space between the two sliced teeth. This suggests that the most of fibrillar materials were collagen fibers formed from human gingival fibroblasts. The structural materials were assumed to be resembled to transseptal fibers in vivo. This culture system is usefull to study the remodeling mechanisms of transseptal fibers in tooth movement.","PeriodicalId":76235,"journal":{"name":"Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society","volume":"49 4","pages":"362-8"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288551","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}

引用次数: 0