title: Augmented mandibular bone structurally adapts to functional loading.
abstract: Long-term changes in trabecular bone structure during the 10 years following onlay grafting with simultaneous mandibular implant placement were studied. Extraoral radiographs of both mandibular sides in eight patients were taken regularly. Bone structure was analysed using a custom-written image analysis program. Parameters studied were trabecular area and perimeter and marrow cavity area and perimeter. After skeletonisation of the trabecular network, the number of end points and branching points, skeleton length, and branch angle were determined. The observed structural changes agree with the development of a more complex and more delicate or fine osseous structure. The bone shows more trabecular branching. All changes are most pronounced in the graft spongiosa, but are also found in the graft cortex and in the original mandible. The mean trabecular branch angle becomes more horizontal. The applied technique can be used to analyse long-term changes in the architecture of bone grafts. Changes found in the graft architecture correspond to changes expected after functional adaptation to loading.
authors.affiliation: Department of Oral and Cranio-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University Medical Centre, Utrecht, The Netherlands. Electronic address: j.w.verhoeven@umcutrecht.nl.
authors.forename: J W
authors.initials: JW
authors.lastname: Verhoeven
authors.forename: J M
authors.initials: JM
authors.lastname: Ruijter
authors.forename: R
authors.initials: R
authors.lastname: Koole
authors.forename: C
authors.initials: C
authors.lastname: de Putter
authors.forename: M
authors.initials: M
authors.lastname: Terlou
authors.forename: M S
authors.initials: MS
authors.lastname: Cune
mesh_terms: D000368:Aged; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D001862:Bone Resorption / Q000209:etiology; D016025:Bone Transplantation; D003758:Dental Implantation, Endosseous / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation*; D008297:Male; D008334:Mandible / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography
keywords: augmentation; bone graft; bone structure; dental implant; mandible; radiology