title: Partitioning the components of maxillary tooth displacement by the comparison of data from three cephalometric superimpositions.
abstract: Using roentgenographic cephalograms from a sample of subjects with metallic implants, appropriately superimposed tracings were used to distinguish developmental and treatment-associated displacements of the maxillary central incisor and first molar associated "local" changes within the periodontium from "secondary" changes which reflect sutural and appositional growth at more distant osseous loci. Tracings were superimposed on anterior cranial base (ACB), on the maxillary implants only (IMP_MAX), and according to the best fit of maxillary anatomic structures without reference to the implants (A_MAX). Using the IMP_MAX superimposition, one could measure total local displacement at any landmark taking into consideration the effects of all appositional and resorptive changes on the superior and anterior surfaces of the palate, whereas using the A_MAX superimposition one could measure local displacement without consideration of surface appositional and resorptive changes. If the second of these measurements were subtracted from the first, the result would be a direct measurement of the effects of surface appositional and resorptive changes as they are expressed at that particular landmark. This strategy has enabled us to quantify and report the amount of accommodation which occurs at the location of each dental landmark in association with the resorptive and appositional changes which occur through time on the superior and anterior surfaces of the hard palate.
authors.affiliation: Department of Growth and Development, School of Dentistry, University of California, San Francisco 94143, USA.
authors.forename: S
authors.initials: S
authors.lastname: Baumrind
authors.forename: Y
authors.initials: Y
authors.lastname: Ben-Bassat
authors.forename: L A
authors.initials: LA
authors.lastname: Bravo
authors.forename: S
authors.initials: S
authors.lastname: Curry
authors.forename: E L
authors.initials: EL
authors.lastname: Korn
mesh_terms: D000293:Adolescent; D001862:Bone Resorption / Q000473:pathology; D002508:Cephalometry; D002648:Child; D003393:Cranial Sutures / Q000254:growth & development; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology*; D008297:Male; D008311:Malocclusion, Angle Class I / Q000628:therapy; D008312:Malocclusion, Angle Class II / Q000628:therapy; D008437:Maxilla / Q000254:growth & development*; D008670:Metals; D008963:Molar / Q000473:pathology*; D010012:Osteogenesis; D010159:Palate / Q000254:growth & development / Q000473:pathology; D010519:Periodontium / Q000033:anatomy & histology; D019736:Prostheses and Implants; D012886:Skull / Q000254:growth & development; D014087:Tooth Movement Techniques
chemical_list: D008670:Metals