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[Problems in orthodontic space closure after loss of first permanent molars]. 第一恒磨牙缺失后正畸间隙封闭的问题
Praktische Kieferorthopadie Pub Date : 1991-11-01
H Wehrbein
{"title":"[Problems in orthodontic space closure after loss of first permanent molars].","authors":"H Wehrbein","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Space closure after loss of first permanent molars represents a difficult treatment task. To arrive at a reasonable treatment result a great variety of factors has to be evaluated in each individual case. These are among others: patient's age, topography of toothless alveolar bone, specific periodontal conditions and general orthodontic problems. In case of several unfavourable prognosticated factors alternative treatment methods should be taken into consideration.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 4","pages":"261-70"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978904","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
[Acceptance of headgear in children and teenagers]. [儿童和青少年对头饰的接受程度]。
Praktische Kieferorthopadie Pub Date : 1991-11-01
M K Thomas, R R Miethke
{"title":"[Acceptance of headgear in children and teenagers].","authors":"M K Thomas,&nbsp;R R Miethke","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>This survey may provide a starting point for the improvement of the acceptability of headgears for children and teenagers during orthodontic treatment by taking aesthetic and material factors into consideration when selecting these appliances. The extent to which these findings are allowed to influence the planning of future treatment must be decided on an individual base; it is to be expected that such considerations will contribute both to the success of therapeutic aims and a reduction of costs in orthodontics.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 4","pages":"285-94"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978906","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 principles of two-teeth-mechanics in straight-wire-technique]. [直线技术中的两齿力学原理]。
Praktische Kieferorthopadie Pub Date : 1991-11-01
R Meyer, H Wehrbein, B Schneider
{"title":"[The principles of two-teeth-mechanics in straight-wire-technique].","authors":"R Meyer,&nbsp;H Wehrbein,&nbsp;B Schneider","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Application of straight-wire-technique leads to expression of complicated biomechanical systems. If these--according to Burstone--are subdivided into simple couples of teeth, it is possible to determine the moments and forces acting on one side of a tooth. However the significant factor for clinical tooth movement are the resulting forces and moments. These can be computed by adding the vectors of the forces and moments acting on both sides of a tooth. Consequently the movement of a single tooth results from the geometry of three teeth. This can be simulated by the superimposition of two systems of two teeth.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 4","pages":"295-302"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978907","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
[Extremely delayed mineralisation of a first premolar in conjunction with submerged deciduous molars--a case report]. [第一前磨牙矿化极度延迟，并伴有乳牙浸没- 1例报告]。
Praktische Kieferorthopadie Pub Date : 1991-11-01
K B Reck, P G Jost-Brinkmann, D E Toll
{"title":"[Extremely delayed mineralisation of a first premolar in conjunction with submerged deciduous molars--a case report].","authors":"K B Reck,&nbsp;P G Jost-Brinkmann,&nbsp;D E Toll","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>This case report presents a patient with extremely delayed mineralisation of a first upper right premolar and simultaneously congenitally missing second premolars. While the germs of the first premolars are usually detectable on dental X-ray films at the age of three or four years, the demonstrated patient was older than 13 years when the first premolar became visible. As the right first bicuspid actively erupted normal root growth took place, and once the tooth is in its normal position its anatomy can be considered normal. With the eruption of the permanent tooth the periodontal situation improved considerably in the region where depression of its predecessor had taken place. As a practical clinical consequence one should take into consideration that mineralisation of a first premolar can be extremely delayed in cases with congenitally missing second premolar teeth.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 4","pages":"303-8"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978908","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
[Combined orthodontic and surgical approach to dentofacial abnormalities--coordination of orthodontic and orthognathic therapy. 1]. 正畸与外科联合治疗牙面异常——正畸与正颌治疗的协调。1]。
Praktische Kieferorthopadie Pub Date : 1991-11-01
F Richter
{"title":"[Combined orthodontic and surgical approach to dentofacial abnormalities--coordination of orthodontic and orthognathic therapy. 1].","authors":"F Richter","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Correction of dentofacial deformities requires a high standard of teamwork between the orthodontist, the oral surgeon and the general dentist. Both, orthodontist and maxillofacial surgeon must establish a combined treatment plan and a time schedule. The treatment goal of presurgical orthodontic preparation includes three-dimensional intra-arch alignment to provide ideal conditions for orthognathic surgery. A typical case report is presented.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 4","pages":"271-84"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978905","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
[Problems of orthodontic care in a patient with Wiedemann-Beckwith-syndrome]. [1例Wiedemann-Beckwith-syndrome患者的正畸护理问题]。
Praktische Kieferorthopadie Pub Date : 1991-11-01
C Opitz, R Witkowski, E Ullrich
{"title":"[Problems of orthodontic care in a patient with Wiedemann-Beckwith-syndrome].","authors":"C Opitz,&nbsp;R Witkowski,&nbsp;E Ullrich","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A review of cases with Wiedemann-Beckwith-syndrome in the literature and a comparison with our case is presented. The specific craniofacial and stomatognathical findings are highlighted. Aspects and problems of orthodontic treatment are discussed.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 4","pages":"309-16"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978909","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
[Clinically relevant biomechanics. 3. Critical reflections about the Burstone intrusion mechanics]. [临床相关生物力学]3.对Burstone入侵机制的批判性反思]。
Praktische Kieferorthopadie Pub Date : 1991-09-01
R S Meyer, H Wehrbein, W Bauer, P Diedrich
{"title":"[Clinically relevant biomechanics. 3. Critical reflections about the Burstone intrusion mechanics].","authors":"R S Meyer,&nbsp;H Wehrbein,&nbsp;W Bauer,&nbsp;P Diedrich","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A segmented arch for intrusion of front teeth, as described by Burstone, is compared to a coil-and-stylus-model. The mechanics of constructive modifications are analyzed and their consequences for the movements of front teeth are discussed. It is shown, that in some cases extrusive forces occur, while intrusive forces are applied. In these cases it is necessary to reduce intrusive forces below 0.20 Newton per side. In order to avoid extrusive forces, it is recommended to apply intruding forces between the centers of resistance of the central and lateral incisors.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 3","pages":"209-14"},"PeriodicalIF":0.0,"publicationDate":"1991-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12976635","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
[Elasto-orthodontic system--a development of the positioner]. [弹性正畸系统——定位器的发展]。
Praktische Kieferorthopadie Pub Date : 1991-09-01
R Hinz
{"title":"[Elasto-orthodontic system--a development of the positioner].","authors":"R Hinz","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A clear classification of the various types of elasto-appliances is necessary in order to understand the indications of such appliances. The elasto-finisher, for example, is used over brackets left in situ after the completion of multibracket therapy whilst the elasto-aligner is placed over specially placed buttons. The elasto-orthodontic system and the indications for the four different types of appliances are presented together with typical case examples. The basic principle of the positioner construction to determine the treatment objectives, namely the set-up, is also essential for the construction of elasto-appliances. The differences between the conventional positioner and elasto-appliances are describe in detail.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 3","pages":"179-88"},"PeriodicalIF":0.0,"publicationDate":"1991-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12976632","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
[Findings for validity of Dresden cephalometric (by Hasund)]. [德累斯顿头颅测量的有效性发现(Hasund)]。
Praktische Kieferorthopadie Pub Date : 1991-09-01
J Rädlinger, W Harzer, A Reinhardt, P Dramm
{"title":"[Findings for validity of Dresden cephalometric (by Hasund)].","authors":"J Rädlinger,&nbsp;W Harzer,&nbsp;A Reinhardt,&nbsp;P Dramm","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Cephalometric analysis is essential in order to evaluate treatment results. 202 patients were investigated for the validity of the norm values according to Hasund. In order to test the validity of the growth prediction methods of Björk and Petrovic 23 class II div. 1 and 21 class III patients were analysed before and after treatment and the treatment results achieved compared with the growth prediction values. The results of the norm value tests showed that the population in Saxonia is more retrognath than that in the northern region of Germany (Hasund norm group). The study also showed that the Björk growth prediction and the Petrovic growth categories were not specific enough and it is therefore suggested that separate growth prediction methods should be used in class II div. 1 and class III groups.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 3","pages":"229-34"},"PeriodicalIF":0.0,"publicationDate":"1991-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978903","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
[Optimization of arch guided tooth movement by the use of powerhooks]. [利用动力钩优化弓导齿运动]。
Praktische Kieferorthopadie Pub Date : 1991-09-01
D Drescher, C Bourauel, H A Schumacher
{"title":"[Optimization of arch guided tooth movement by the use of powerhooks].","authors":"D Drescher,&nbsp;C Bourauel,&nbsp;H A Schumacher","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Arch guided tooth movement is today still the most often used technique to move teeth bodily in mesiodistal direction. One of the most important disadvantage of this method, however, is friction between bracket and arch wire, which impairs tooth movement and may result in dangerous overload of the anchorage units. Powerhooks are used to accomplish a more effective orthodontic tooth movement by reduction of the tipping and rotating moments. This investigation answers the question which mechanical dimensions powerhooks should have in order to minimize friction. If the point of force application lies coronally to the center of resistance (CR) and rotatory moments are eliminated, friction can be reduced by as much as 90%. Concerning length, powerhooks must not be extended beyond. Otherwise, if the point of force application lies apically to CR, friction increases dramatically. In the horizontal direction, a unilateral powerhook should not be extended to more than the half of its length.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 3","pages":"201-8"},"PeriodicalIF":0.0,"publicationDate":"1991-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12976634","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
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