Hahn, Wolfram

[["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"]]