title: [The maxillary sixth-year molar and its relation to the maxillary sinus. A comparative study between the panoramic tomogram and the computed tomogram].
abstract: Panoramic radiographs (OPGs) and computer tomograms (CTs) of 30 patients, the latter taken on average 2.5 months later, were evaluated for the purpose of comparing the relation of their roots to the bottom of the maxillary sinus. The CT and OPG images yielded significant differences in the topographic relations between the roots and the maxillary sinus. In the OPG 64 out of 129 roots seemed to penetrate the maxillary sinus. In the CT transversal slices, on the other hand, penetration could be observed for only 37 roots. This phenomenon became more apparent when the relations between the mesial, distal, buccal, and oral root surfaces and their relations to the sinus were assessed. Applying a three stage scoring scheme, it was found that in the large majority of cases only the apices were in contact with the mucosa of the sinus. Thus, the possible loss of anchorage in these cases is below five percent.
authors.affiliation: Poliklinik für Kieferorthopädie, Rheinische Friedrich-Wilhelms-Universität Bonn.
authors.forename: M
authors.initials: M
authors.lastname: Freisfeld
authors.forename: D
authors.initials: D
authors.lastname: Drescher
authors.forename: B
authors.initials: B
authors.lastname: Schellmann
authors.forename: H
authors.initials: H
authors.lastname: Schüller
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging*; D008963:Molar / Q000000981:diagnostic imaging*; D011862:Radiography, Panoramic / Q000295:instrumentation / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods; D014092:Tooth Root / Q000000981:diagnostic imaging
vernacular_title: Der Oberkiefer-Sechsjahrmolar und seine Beziehung zur Kieferhöhle. Eine Vergleichsstudie zwischen Panoramaschichtaufnahme und Computertomogramm.