Praktische Kieferorthopadie最新文献

{"title":"[Use of temporary crowns for corrections of malocclusions during the deciduous dentition in children with cleft lips and palates].","authors":"M Bacher,&nbsp;P Koppenburg,&nbsp;D Dausch-Neumann","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Diagnosis and correction of the a priori not normal development of the dentition in cleft palate children is of utmost importance in the primary dentition. Secondary preventive dental care using uncomplicated procedures is one of the most rewarding responsibilities in cleft orthopedics. Aesthetics in dentistry is stressed and cleft palate children should not be excluded out of consideration for their parents. A technical modification of the inclined plane using only tooth coloured materials for the treatment of sagittal and transverse anomalies of the primary dentition is presented. Case reports include a patient with a genetic disposition for anomalies in the ipsilateral maxillary quadrant.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 1","pages":"49-60"},"PeriodicalIF":0.0,"publicationDate":"1991-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12977455","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":"[Clinically relevant biomechanics--1. Moment/force ratio--terminologic clarification].","authors":"R S Meyer,&nbsp;P Diedfrich","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The movement of a tooth under the influence of an orthodontic appliance is dependent upon the acting force and the resulting moment. This moment can be computed by adding the inherent moment of the force and the therapeutic moment of the appliance. The article points out the differences between these two kinds of moments. Moreover, it describes, that the resulting moment is the base for another kind of moment-to-force-ratio, Mi/F', which is the only parameter to predict the direction of orthodontic tooth movement.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 1","pages":"37-42"},"PeriodicalIF":0.0,"publicationDate":"1991-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12977452","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":"[Usefulness of the sum angle according to Björk (Jarabak)].","authors":"K B Reck,&nbsp;R R Miethke","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The term sumangle (SA) according to Björk has been attributed in the literature to Jarabak. The term was not used by Björk in his original works. Because of the demonstrated relations the sumangle can be deducted from the simplified calculation SA = X + 360 degrees, whereby X is the angle between the reference lines NS-ML. Beside from this fact also the high unreliability of defining the necessary reference points makes the sumangle a questionable measurement of vertical skeletal development. Therefore other trigonometric parameters as for instance the Y-axis are preferable.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 1","pages":"61-4"},"PeriodicalIF":0.0,"publicationDate":"1991-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12977456","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 different enamel structures on bonding of glass ionomer cements].","authors":"H Fischer-Brandies,&nbsp;G Kluge,&nbsp;J Theusner","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In the present study, the adhesive strength of glass-ionomer cement (GIC) for bracket bonding is analysed in relation to the surface characteristics of the enamel. The bonding of brackets to the enamel of impacted teeth as well as erupted teeth of adolescents and adults is determined in shear force experiments. The results of our investigation shows that GIC attaches to adult enamel to a significantly better extent than to the teeth of adolescents. The poorest values were shown in impacted teeth. It is shown with reference to scanning electron micrograms that surface lesions occur especially frequently in use of conventional etching technique on enamel in adults after debonding the bracket. GIC thus appears to be a promising alternative material for bracket fixation which does not damage the enamel, especially in adult orthodontics. In view of the result, its suitability should be checked in clinical studies.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 1","pages":"43-8"},"PeriodicalIF":0.0,"publicationDate":"1991-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12977454","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":"[Biomechanical aspects of the spring-active-appliance during the night sleep].","authors":"F G Sander","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. During the night the mandibular activities caused by the spring-active-appliance are increased. Seven times more mandibular movements occur compared to the activator according to Andresen-Häupl. 2. A distinct increased mandibular activity during the time the patient fall asleep or in the wake up time can be registered, especially in the adaptation phase or after reactivating the springs. 3. Powerful activities of the m. masseter did not lead to an inversion of the mandibular movement. 4. A regular movement of the mandible is the most frequent movement whilst mandibular activities. 5. During the night asymmetrical activities of the mm. masseters very often occur. 6. An inversion of the mandibular movement, that means a counter-clockwise-rotation of the m. mandible, occurs if the force direction of the m. temporalis is directed more distally or if the ratio between masseter- and temporalis activities are for the benefit of the temporalis-activities. 7. During the night the springs in the spring-active-appliance cause a counter-clock wise-rotation of the mandible without mandibular activities around a transverse axis in the region of the molars. This leads to an approach of the anterior teeth whilst the distance between the molars remains constant. 8. Contrary movements and rotations around a transverse axis in the region of the molars lead to a distraction of the condyle of about one millimeter.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"5 1","pages":"17-28"},"PeriodicalIF":0.0,"publicationDate":"1991-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12977450","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 bionator with extraoral traction--the Wurzburg concept. 1].","authors":"E Witt,&nbsp;G Sahm,&nbsp;R Hevia","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In this publication the bionator with extraoral anterior traction is presented. The preparation of the bionator and the headgear fit is demonstrated. The indication for the use of the appliance combination is outlined. The results of a cephalometric study concerning the therapeutic effects are presented. The following changes are especially noteworthy: There is a reduction of the SNA-angle, a significant retrusion of the upper incisors occurs. The mesial drift of the upper 6-year molars is inhibited, a slight posterior rotation of the maxilla is observed. In patients who wore their appliances well, a protrusion of the lower incisors could not be observed.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"4 4","pages":"285-92"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290360","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":"[Retrospective evaluation and experimental radiographic study on bone reaction concomitant with orthodontic tooth movement].","authors":"G Sahm,&nbsp;P Haffner,&nbsp;H G Klinger","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Concomitant with orthodontic tooth movement a radiographically dense zone of high mineralisation can be observed on the periodontal tension side. This zone consists of the alveolar cortical bone and mineralized osteoid. This bone reaction has not evoked much interest in orthodontic literature in the past. In a retrospective study, orthopantomograms of children in orthodontic treatment were evaluated, and the discussed reaction was studied in relation with different treatment parameters. Opaque bone layers were found in cases in whom the orthopantomogram was made within 6 months after initiating tooth movement. When using elastics for tooth movement the bone reaction under discussion was comparatively rare. There is no proneness to root resorption in teeth showing the described adjacent bone reaction. Bone reaction was also studied with a densitometric radiological procedure. In all 9 cases the bone reaction was observed.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"4 4","pages":"323-30"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290363","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":"[Criterias for the selection of neckstraps in therapy with extraoral forces].","authors":"A Weinreich","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. Considerable differences could be measured in the force-deflexion-diagram whilst using different neckstraps. These differences could be explained by the different material qualities. 2. Force-deflexion-diagramm achieved in vitro could not be transfered directly to the therapy of patients. 3. Extreme asymmetrical force distributions at the outer bows will arise during the therapy with extraoral forces, because of the friction between skin, textile neckstrap and adjustable traction bands. These asymmetrical force distributions will arise particularly during functional movements of the head. Turnings and noddings lead to extreme values, by reaching the maximum asymptotically. 4. The use of a force snap-away neckpad also often leads to asymmetrical force distributions at the outer bows. 5. Asymmetries occur less often whilst using the low-cervical-pull according to Sander, due to the reduced friction between the two plastic parts of this headgear system. Head movements nearly always lead to an equalization of the forces at the outer bow. Extreme forces last less than one second. The mean value of the force at the outer bow, ascertained over a longer period, is only a little bit less than the force of 500 g adjusted at the beginning. 6. The mean value of the forces measured over a longer period while wearing an adjustable traction band is nearly 50% less than the force adjusted at the beginning. 7. The adjustment of the force at the outer bows is done while the patient is sitting in an upright position. However the patient is normally very seldom in such a position so that, as a rule, the forces at the outer bows are less than the adjusted force. 8. The problem of lesser forces at the outer bows can be compensated by a longer wearing period and by a higher initial force adjustment. 9. The adjustment of the force at the outer bow with the help of a spring-balance leads to inaccuracy and, as rule, the real force application to the molar is significantly less. 10. Only the wearing of the low-cervical-pull according to Sander leads to reproducible force values during head turning and noddings. Also the mean force value corresponds to the initial applied force. 11. While using an adjustable traction band it is advisable to change this often during the treatment. Otherwise the function of the treatment with the extraoral force will be reduced because of the loss of elasticity of the traction band.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"4 4","pages":"305-22"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290362","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":"[Biomechanic of the asymmetrical headgear].","authors":"F G Sander","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The asymmetrical headgear is a very useful treatment device for the unilateral distalisation of molars or for the correction of an unilateral anchorage loss. 1. The dimension of the asymmetrical effect depends on the configuration of the outer bows. 2. The function of an asymmetrical face-bow can be increased or decreased by eccentric bendings. 3. According to the geometry at the outer-bows the force at the outer-bow is divided at a different percentage onto the molars. 4. While the forces increase the asymmetrical effect will decrease when the outer-bow is too flexible. 5. Attention has to be payed at each control-appointment to the distance of the longer outer-bow to the cheek. 6. The asymmetrical swivel face-bow did not produce a greater asymmetrical function than other asymmetrical headgears. The reason of this fact is, that only the geometry of the outer-bows is responsible for the unilateral distalisation. 7. The asymmetrical swivel face-bow as described above is advisable to use because eccentric bendings and less forces at the outer-bows will decrease, stop or even reverse the asymmetrical effect. 8. The side-effect of any asymmetrical face-bow is a lateral force-component. This force-component can cause a cross-bite at the molar which has to be more distalized. The molar which is not be moved by the asymmetrical face-bow will be moved buccally by this force-component. 9. The swivel face-bow according to Sander prevents the buccal movement of the molar which should not be moved. But the tendency to create a cross-bite for the molar which should be more distalized, increases. 10. The swivel face-bow according to Sander can be combined with all well-known extraoral tractions. 11. Equal forces at the outer-bows can be reached while using a cervical-pull neckstrap according to Sander. 12. The asymmetrical face-bow and the bite-jumping-appliance can be used simultaneously if the face-bow inserts directly into the attachments of the molar bands.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"4 4","pages":"293-304"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290361","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":"[Indication and effectiveness of the J-hook headgear].","authors":"R R Miethke","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In this article the three most important types of J-hook headgears, the horizontalpull, the high-pull and the verticalpull are demonstrated. Indications of these headgearsamples are the (asymmetrical) retraction of teeth and groups of teeth, intrusion of anterior teeth including a very effective support of torque control, inhibition of horizontal and vertical growth of maxilla and mandible, compensation of side effects of Class I and Class III rubberbands, midline-corrections and retention following surgical correction of open bites. The headgear force can either be distributed directly on the teeth to be moved, on hooks which are soldered on the archwire, on chin caps or mandibular troughs resp. on functional appliances. The advantages of the J-hook headgear are an excellent control of anchorage, the variability (primarily of the vector of forces), but also a consistency after having established the assigned force vector, a consistency which also includes the amount of choosen force. Further advantageous is the simultaneous retraction of teeth in both arches as is the easy and safe handling of this headgear by patients and by the orthodontic team. In contrast to these outstanding advantages there are only very few disadvantages. These have mainly to be seen in a tendency of dental arch expansion and the rare occurrence of certain pressure induced problems in the soft tissues of the skull. In the first case a constriction of the archwire and even more a transpalatal arch will help to prevent this from happening. In the second case the best counter measure is the use of accessory soft pads.</p>","PeriodicalId":77592,"journal":{"name":"Praktische Kieferorthopadie","volume":"4 4","pages":"267-84"},"PeriodicalIF":0.0,"publicationDate":"1990-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290359","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}