Hahn, Wolfram

[["dc.bibliographiccitation.artnumber","12.e1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","American Journal of Orthodontics and Dentofacial Orthopedics"],["dc.bibliographiccitation.volume","136"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Fialka-Fricke, Julia"],["dc.contributor.author","Fricke-Zech, Susanne"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T08:27:52Z"],["dc.date.available","2018-11-07T08:27:52Z"],["dc.date.issued","2009"],["dc.description.abstract","Introduction: The aim of the study was to quantify the forces delivered by thermoplastic appliances made of 2 materials with 2 thicknesses to a maxillary central incisor during tipping. Methods: Two materials were tested, each in 2 thicknesses: Erkodur (Erkodent Erich Kopp GmbH, Pfalzgrafenweiler, Germany) 1.0 and 0.8 mm, and Biolon (Dreve Dentamid GmbH, Unna, Germany), 1.0 and 0.75 mm. For each material, 5 appliances were produced. To measure the forces applied, an isolated measuring tooth, part of a standardized resin model, was deflected in 0.05 degrees steps from 0 degrees to 0.42 degrees in the vestibular and palatine directions, after placing the respective appliance on the model. For statistical analysis, the force components Fx/tipping and Fz/intrusion at a displacement of +/- 0.151 mm from the incisor edge were selected. Means and standard deviations were calculated. The Wilcoxon 2-sample test for group pairings was used. Results: The norms for the mean Fx forces ranged from 1.62 (SD, 0.41) to 5.35 N (SD, 0.63). The mean Fz forces were between 0.07 (SD, 0.13) and -2.47 N (SD, 0.34). The highest intrusive forces were measured during vestibular displacement of the measuring tooth. The forces delivered by the thick appliances were overall significantly higher (P < 0.0001) than those of the thin materials. The forces delivered by the Biolon appliances were generally significantly higher (P < 0.0001) than those for the Erkodur materials. Conclusions: The forces applied were mostly too high when compared with those stated in the literature as ideal. In addition to thickness, the thermoforming process influences the magnitude of the force delivered by a thermoformed appliance. (Am J Orthod Dentofacial Orthop 2009; 136: 12.e1-12.e7)"],["dc.identifier.doi","10.1016/j.ajodo.2008.12.015"],["dc.identifier.isi","000267695500009"],["dc.identifier.pmid","19577136"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16295"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Mosby-elsevier"],["dc.relation.issn","0889-5406"],["dc.title","Influence of thermoplastic appliance thickness on the magnitude of force delivered to a maxillary central incisor during tipping"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","443"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTOLOGY"],["dc.bibliographiccitation.lastpage","449"],["dc.bibliographiccitation.volume","108"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Fricke-Zech, Susanne"],["dc.contributor.author","Fialka-Fricke, Julia"],["dc.contributor.author","Dullin, Christian"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Gruber, Rudolf"],["dc.contributor.author","Sennhenn-kirchner, Sabine"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T11:25:20Z"],["dc.date.available","2018-11-07T11:25:20Z"],["dc.date.issued","2009"],["dc.description.abstract","Objective. An investigation was conducted to compare the image quality of prototype flat-panel volume computed tomography (fpVCT) and multislice computed tomography (MSCT) of suture structures. Study design. Bone samples were taken from the midpalatal suture of 5 young (16 weeks) and 5 old (200 weeks) Sus scrofa domestica and fixed in formalin solution. An fpVCT prototype and an MSCT were used to obtain images of the specimens. The facial reformations were assessed by 4 observers using a 1 (excellent) to 5 (poor) rating scale for the weighted criteria visualization of the suture structure. A linear mixed model was used for statistical analysis. Results with P < .05 were considered to be statistically significant. Results. The visualization of the suture of young specimens was significantly better than that of older animals (P < .001). The visualization of the suture with fpVCT was significantly better than that with MSCT (P < .001). Conclusion. Compared with MSCT, fpVCT produces superior results in the visualization of the midpalatal suture in a Sus scrofa domestica model. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 108: 443-449)"],["dc.identifier.doi","10.1016/j.tripleo.2009.02.034"],["dc.identifier.isi","000269361900023"],["dc.identifier.pmid","19464211"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56598"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Mosby-elsevier"],["dc.relation.issn","1079-2104"],["dc.title","Imaging of the midpalatal suture in a porcine model: Flat-panel volume computed tomography compared with multislice computed tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","433"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","European Journal of Orthodontics"],["dc.bibliographiccitation.lastpage","436"],["dc.bibliographiccitation.volume","30"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Fricke, Julia"],["dc.contributor.author","Fricke-Zech, Susanne"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Gruber, Rudolf"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T11:10:30Z"],["dc.date.available","2018-11-07T11:10:30Z"],["dc.date.issued","2008"],["dc.description.abstract","The aim of this study was to evaluate the time requirement of a newly developed device made of neodymium-iron-boron (NdFeB) magnets for positioning a multi-stranded, canine-to-canine retainer during bonding compared with dental floss and a transfer tray. Forty-five patients aged between 12 and 33 years (26 male, 19 female) previously treated with fixed appliances were enrolled in the study. The patients were randomly allocated to three groups (15 per group). For each group a mandibular canine-to-canine retainer of 0.018 inch Dentaflex multi-stranded wire (Dentaurum) was prefabricated for each patient on a cast. The bonding procedure was identical, except for the method of positioning the wire during adhesive fixation: group A dental floss, group B a small prefabricated transfer tray of dental resin and group C the NdFeB magnet device. For each group, the time required for the complete bonding process was measured. Kruskal-Wallis and Wilcoxon-Mann-Whitney tests were used for group and pairwise comparisons, respectively. The three methods required statistically significant different times (P < 0.001). The Wilcoxon-Mann-Whitney test revealed that wire positioning with the magnet device was significantly faster [4.98 minutes; standard deviation (SD) 0.68 minutes] than with dental floss (7.65 minutes, SD 1.14 minutes; P = 0.0001) or with transfer tray (5.75 minutes, SD 0.57 minutes; P = 0.001). The NdFeB magnet device is a timesaving appliance for positioning a multi-stranded, canine-to-canine retainer during bonding when compared with dental floss and an individually prefabricated transfer tray."],["dc.identifier.doi","10.1093/ejo/cjn037"],["dc.identifier.isi","000260151600001"],["dc.identifier.pmid","18687989"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53223"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Oxford Univ Press"],["dc.relation.issn","0141-5387"],["dc.title","The use of a neodymium-iron-boron magnet device for positioning a multi-stranded wire retainer in lingual retention-a pilot study in humans"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","607"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","European Journal of Orthodontics"],["dc.bibliographiccitation.lastpage","613"],["dc.bibliographiccitation.volume","32"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Fialka-Fricke, Julia"],["dc.contributor.author","Fricke-Zech, Susanne"],["dc.contributor.author","Gruber, Rudolf"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T08:36:11Z"],["dc.date.available","2018-11-07T08:36:11Z"],["dc.date.issued","2010"],["dc.description.abstract","Five identical appliances were manufactured from each of three materials, all with a thickness of 1.0 mm (Ideal Clear (R), Erkodur (R), and Biolon (R)). An upper central incisor, as part of the measuring device, was torqued in defined steps in the vestibular and palatal directions with the respective appliance in place. For statistical analysis, the resulting forces, Fx (forces acting in the palatal and facial directions) and Fz (intrusive force as a side-effect) at a displacement of +/- 0.15 and +/- 0.8 mm from the tooth at the gingival margin were calculated. The mean Fx forces for +/- 0.15 mm displacement ranged from -1.89 N [standard deviation (SD) 0.48] to 0.11 N (SD 0.1). The mean Fz forces were between -0.97 N (SD 0.57) and -0.07 N (SD 0.22). The highest intrusive forces were measured during palatal displacement of the measuring tooth. An influence of direction of displacement on the levels of force was observed, especially for Fz at the greater displacement of +/- 0.8 mm. In relation to the intended amount of root movement during torquing, aligners tend to 'lift up' and therefore no effective force couple can be established for further root control. The force delivery properties are also influenced by the material used and the shape of the tooth."],["dc.identifier.doi","10.1093/ejo/cjq007"],["dc.identifier.isi","000284638800005"],["dc.identifier.pmid","20462912"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18252"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Oxford Univ Press"],["dc.relation.issn","0141-5387"],["dc.title","Torquing an upper central incisor with aligners-acting forces and biomechanical principles"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","152"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie"],["dc.bibliographiccitation.lastpage","158"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Knoesel, Michael"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Bauss, Oskar"],["dc.date.accessioned","2018-11-07T08:32:17Z"],["dc.date.available","2018-11-07T08:32:17Z"],["dc.date.issued","2009"],["dc.description.abstract","Objective: The objective of this study consisted in determining the variability of the ANB angle in relation to the position of the A- and B-points in the sagittal vertical plane. Materials and Methods: Using a theoretical model, we varied the position of the cephalometric points A and B in the sagittal vertical plane while its sagittal relationship was kept constant (Wits value = 0 mm). For this purpose, seven Lines were erected perpendicular to the occlusal plane on a lateral cephalogram. The position of points A and B were determined on each of the vertical Lines by calculating one anterior and one posterior angle in each case. In this way, the positions of all A- and B-points were clearly defined in the sagittal vertical plane. Results: The characteristic of the ANB angle in the sagittal vertical plane was graphically represented by determining both points A and B using two angles instead of one. This revealed that the ANB angle for the same sagittal base relationship was characterized by major variations depending on the position of the A- and B-points in relation to the anterior cranial base. The Larger the SNA and SNB angles were, the larger the corresponding ANB angle. At the same time, the absolute value of ANB increased with the Length of the vertical distance between the points A and B. Conclusion: The ANB angle is strongly influenced by geometric factors. Accurate diagnosis of the sagittal base relationship should thus take the individual character of the ANB angle into account."],["dc.identifier.doi","10.1007/s00056-009-8809-5"],["dc.identifier.isi","000266559400005"],["dc.identifier.pmid","19322533"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17305"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Urban & Vogel"],["dc.relation.issn","1434-5293"],["dc.title","Geometric Influence of the Sagittal and Vertical Apical Base Relationship on the ANB Angle"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","390"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Annals of Anatomy - Anatomischer Anzeiger"],["dc.bibliographiccitation.lastpage","392"],["dc.bibliographiccitation.volume","189"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Knoesel, Michael"],["dc.contributor.author","Thieme, Kirsten M."],["dc.contributor.author","Naegerl, Hans"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.date.accessioned","2018-11-07T11:05:56Z"],["dc.date.available","2018-11-07T11:05:56Z"],["dc.date.issued","2007"],["dc.description.abstract","The primary aim of the study was to reveal whether the free opening movement of the mandible can be determined by only 2 rotational axes as suggested in recent literature. For this purpose, the free opening movement of the mandible was registered in 20 asymptomatic patients using an ultrasonic measuring system. Subsequently, the locations of the instantaneous centers of rotation (ICR) were determined directly from the raw data. In a second approach, the same data were used to construct a mandibular and maxillar rotational axis according to the dimeric link chain (DLC) concept. On the basis of the angular velocities around these 2 axes, the positions of the ICR were calculated in the sagittal-verticat plane. Calculating the ICR by the DLC method provides similar results to that of the conventional approaches. It can be concluded that the DLC method is a valid approach and that considering the planar mandibular movement as a movement with 2 degrees of freedom is justified. (C) 2007 Elsevier GmbH. All rights reserved."],["dc.identifier.doi","10.1016/j.aanat.2007.02.013"],["dc.identifier.isi","000248006000018"],["dc.identifier.pmid","17695999"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52186"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Gmbh, Urban & Fischer Verlag"],["dc.publisher.place","Jena"],["dc.relation.conference","102nd Annual Meeting of the Anatomische-Gesellschaft"],["dc.relation.eventlocation","Giessen, GERMANY"],["dc.relation.issn","0940-9602"],["dc.title","Dimeric link chain and instantaneous centers of rotation of the mandible"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","404"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Annals of Anatomy - Anatomischer Anzeiger"],["dc.bibliographiccitation.lastpage","406"],["dc.bibliographiccitation.volume","189"],["dc.contributor.author","Ihlow, Dankmar"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Bernitt, Katrin"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.contributor.author","Thieme, Kirsten M."],["dc.contributor.author","Naegerl, Hans"],["dc.date.accessioned","2018-11-07T11:05:57Z"],["dc.date.available","2018-11-07T11:05:57Z"],["dc.date.issued","2007"],["dc.description.abstract","The subject of this study was to analyse how functional parameters of stomatognathic systems are influenced by growth. For this purpose, two cephalometric radiographs of 65 patients with class-II-retation treated with functional appliances were superimposed on the occlusal. plane. The two patient groups consisted of 32 open bite and 33 deep bite cases. The direction of the condylar growth significantly differed for both cases. Nevertheless the hypothesis could be confirmed that the original functional structure was hardly affected by growth. (C) 2007 Elsevier GmbH. All rights reserved."],["dc.identifier.doi","10.1016/j.aanat.2007.02.019"],["dc.identifier.isi","000248006000021"],["dc.identifier.pmid","17696002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52189"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Gmbh, Urban & Fischer Verlag"],["dc.publisher.place","Jena"],["dc.relation.conference","102nd Annual Meeting of the Anatomische-Gesellschaft"],["dc.relation.eventlocation","Giessen, GERMANY"],["dc.relation.issn","0940-9602"],["dc.title","Biomechanical aspects of mandibular growth"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","272"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTOLOGY"],["dc.bibliographiccitation.lastpage","278"],["dc.bibliographiccitation.volume","107"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Fricke-Zech, Susanne"],["dc.contributor.author","Fricke, Julia"],["dc.contributor.author","Gruber, Rudolf Matthias"],["dc.contributor.author","Dullin, Christian"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Hannig, Christian"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T08:33:16Z"],["dc.date.available","2018-11-07T08:33:16Z"],["dc.date.issued","2009"],["dc.description.abstract","Objective. Our aim was to evaluate the capacity of flat-panel volume computerized tomography (fpVCT) to enable the observer to detect and differentiate 3 different sizes of simulated tooth root defects in radiographs. Study design. Three simulated tooth root defects of different sizes and a defect-free area ( 160 sites in total) were randomly distributed on the buccal and lingual surface of 20 mandibular premolar roots of Sus scrofa domestica with round burs. For the imaging of the specimens, an fpVCT prototype was used. Findings were evaluated by 3 observers. Results. Cavity 0 ( no lesion) was correctly identified in 53%, cavity 1 in 69%, cavity 2 in 96%, and cavity 3 in 89%. Altogether, the simulated cavities were classified in a correct manner in 77%. The values were compared using receiver operating characteristic curves. The area under the curve (AUC) for cavity 0 versus the pooled results for cavities 1-3 was found to be 0.72. The AUC for the pooled results for 0-2 ( no pathologic impact) versus cavity 3 ( potential pathologic impact) was 0.94. There was no significant dependence of the results on the observer (P = .37). Results with P < .05 were considered to be significant. Conclusions. Flat-panel volume computerized tomography, which is currently used only as a research tool, has a high potential in detection and differentiation at an early stage of external root resorption cavities with pathologic relevance.. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107: 272-278)"],["dc.identifier.doi","10.1016/j.tripleo.2008.04.030"],["dc.identifier.isi","000262328100020"],["dc.identifier.pmid","18602316"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6122"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17534"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Mosby-elsevier"],["dc.relation.issn","1079-2104"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Detection and size differentiation of simulated tooth root defects using flat-panel volume computerized tomography (fpVCT)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","239"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","The Angle Orthodontist"],["dc.bibliographiccitation.lastpage","246"],["dc.bibliographiccitation.volume","80"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Engelke, Benjamin"],["dc.contributor.author","Jung, Klaus"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Fialka-Fricke, Julia"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T08:45:08Z"],["dc.date.available","2018-11-07T08:45:08Z"],["dc.date.issued","2010"],["dc.description.abstract","Objective: To determine the forces and moments delivered to a maxillary central incisor during rotation by three different thermoplastic appliances with identical thickness. Materials and Methods: Five identical appliances were manufactured from each of three materials (Ideal Clear 1.0 mm, Erkodur 1.0 mm, Biolon 1.0 mm). An upper central incisor fixed in a measuring device was rotated around its central axis in 0.5-degree steps to +/-2.5 degrees, +/-5 degrees, and +/-7.5 degrees (equivalent to an activation of +/-0.17 mm, +/-0.34 mm, and +/-0.51 mm of the incisor edge) in the clockwise and anticlockwise directions with the respective appliance fixed in place. For statistical analysis, the moments Tz (rotation) and forces Fz (intrusion) were tested. Means and standard deviations for Tz and median and 25% and 75% quantiles for Fz were calculated. An analysis of variance (ANOVA) was performed. Results: The minimal moment was determined at a rotation of -0.17 mm (-7.3 Nmm, +/-0.8), and the maximal moment at a deflection of -0.51 mm (-71.8 Nmm. +/-2.5) was recorded. The minimal value for Fz was measured at an activation of -0.17 mm (0.0 N), and the highest intrusive forces were evaluated for a rotation of -0.51 mm (-5.8 N). The particular material sometimes had a significant (P < .05) influence on the forces delivered and the moments. Conclusions: During rotation with aligners, an intrusive force can also be observed. The direction of rotation, and the materials used all exert an influence on the force delivery properties of the appliance. (Angle Orthod. 2010;80:239-246.)"],["dc.identifier.doi","10.2319/033009-181.1"],["dc.identifier.isi","000275383000004"],["dc.identifier.pmid","19905847"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6860"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20365"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","E H Angle Education Research Foundation, Inc"],["dc.relation.issn","0003-3219"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Initial Forces and Moments Delivered by Removable Thermoplastic Appliances during Rotation of an Upper Central Incisor"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","625"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","European Journal of Orthodontics"],["dc.bibliographiccitation.lastpage","631"],["dc.bibliographiccitation.volume","31"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Fialka-Fricke, Julia"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Fricke-Zech, Susanne"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Gruber, Rudolf"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T11:21:26Z"],["dc.date.available","2018-11-07T11:21:26Z"],["dc.date.issued","2009"],["dc.description.abstract","The force properties of thermoformed appliances have not been systematically investigated. Therefore, the aim of the present study was to quantify the forces delivered by thermoplastic appliances manufactured from three different materials, with the same thickness, on a central upper incisor, during tipping. Five identical appliances were manufactured from three different materials all with a thickness of 1.0 mm (Ideal Clear (R), Erkodur (R), and Biolon (R)). For measuring the forces, an isolated measuring tooth, as part of a standardized resin model incorporated in a newly developed measuring device, was tipped in nine 2.7 arc minute (0.04629 degree) steps, from 0 to 0.416 degrees in the vestibular and palatal directions around a rotational axis through the virtual apex, after positioning an appliance on the model. For statistical analysis, the force components Fx/tipping and Fz/intrusion at a displacement of +/- 0.151 mm from the incisor edge were determined. Means and standard deviations (SDs) were calculated. The Kruskal-Wallis test for overall effects and the Wilcoxon two-sample test for individual group pairings were used (P < 0.05 significance level). The mean Fx forces ranged from -2.82 N (SD 0.62) to 5.42 N (SD 0.56). The mean Fz forces were between -0.14 N (SD 0.52) and -2.3 N (SD 0.43). The highest intrusive forces were measured during vestibular displacement of the measuring tooth. The forces delivered by the Biolon (R) appliance were found to be much greater (P < 0.01) than those of the other materials. The forces delivered by the materials investigated were mostly higher than those stated in the literature."],["dc.identifier.doi","10.1093/ejo/cjp047"],["dc.identifier.isi","000272065000009"],["dc.identifier.pmid","19525441"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55770"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Oxford Univ Press"],["dc.relation.issn","0141-5387"],["dc.title","Initial forces generated by three types of thermoplastic appliances on an upper central incisor during tipping"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]