Wil Gm Geraets1, Grethe Jonasson2,3, Magnus Hakeberg3. 1. Department of Oral Radiology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands. 2. Research & Development Unit in Southern Ӓlvsborg County, Sven Eriksonplatsen 4, SE-50338 Borås, Sweden. 3. Department of Behavioral and Community Dentistry, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Box 450, 405 30 Gothenburg, Sweden.
Abstract
OBJECTIVES: The radiographic trabecular pattern on dental radiographs may be used to predict fractures. The aim of this study was to analyze longitudinal changes in the mandibles of 145 females between 1980 and 2005. METHODS: Panoramic radiographs were obtained in 1980 and 2005. On 290 radiographs, regions of interest (ROIs) were selected in the ramus, angle and body. In all ROIs, the orientation was measured in 36 directions with the line frequency deviation method. The effects of ageing were analyzed for the fracture and the non-fracture groups separately. RESULTS: During the follow-up, 61 females suffered fractures of the hip, wrist, spine, leg or arm. The fracture and non-fracture groups displayed dissimilar age changes in each investigated ROI. All significant changes pertained to increasing values of line frequency deviation. With increasing age, the trabecular network in the mandible lost details and the trabeculae became more aligned in their main direction. In the "ramus", the alignment was to the 110-120˚ axis, parallel to the posterior and anterior ramus border. In the "angle", the alignment was to the 135-150˚ axis, parallel to the oblique line, and in the "body" ROI to the 150-175˚ direction, approximately parallel to the occlusal plane and inferior cortex. CONCLUSION: Most changes were consistent with the notion that the bone aged less severely in the non-fracture group. In the fracture group, the findings indicate that bone loss leads to redistribution of the remaining bone tissue in such a way that the trabeculae are accentuated perpendicular to the principal loading.
OBJECTIVES: The radiographic trabecular pattern on dental radiographs may be used to predict fractures. The aim of this study was to analyze longitudinal changes in the mandibles of 145 females between 1980 and 2005. METHODS: Panoramic radiographs were obtained in 1980 and 2005. On 290 radiographs, regions of interest (ROIs) were selected in the ramus, angle and body. In all ROIs, the orientation was measured in 36 directions with the line frequency deviation method. The effects of ageing were analyzed for the fracture and the non-fracture groups separately. RESULTS: During the follow-up, 61 females suffered fractures of the hip, wrist, spine, leg or arm. The fracture and non-fracture groups displayed dissimilar age changes in each investigated ROI. All significant changes pertained to increasing values of line frequency deviation. With increasing age, the trabecular network in the mandible lost details and the trabeculae became more aligned in their main direction. In the "ramus", the alignment was to the 110-120˚ axis, parallel to the posterior and anterior ramus border. In the "angle", the alignment was to the 135-150˚ axis, parallel to the oblique line, and in the "body" ROI to the 150-175˚ direction, approximately parallel to the occlusal plane and inferior cortex. CONCLUSION: Most changes were consistent with the notion that the bone aged less severely in the non-fracture group. In the fracture group, the findings indicate that bone loss leads to redistribution of the remaining bone tissue in such a way that the trabeculae are accentuated perpendicular to the principal loading.
Entities:
Keywords:
aging; bone fracture; longitudinal; mandible; orientation; population study; prospective; radiography; women
Authors: W G M Geraets; L J van Ruijven; J G C Verheij; T M G J van Eijden; P F van der Stelt Journal: Dentomaxillofac Radiol Date: 2006-09 Impact factor: 2.419
Authors: Stuart C White; Akira Taguchi; David Kao; Sam Wu; Susan K Service; Douglas Yoon; Yoshikazu Suei; Takashi Nakamoto; Keiji Tanimoto Journal: Osteoporos Int Date: 2004-07-27 Impact factor: 4.507
Authors: S C White; K A Atchison; J A Gornbein; A Nattiv; A Paganini-Hill; S K Service; D C Yoon Journal: Dentomaxillofac Radiol Date: 2005-05 Impact factor: 2.419
Authors: Brent C Taylor; Pamela J Schreiner; Katie L Stone; Howard A Fink; Steven R Cummings; Michael C Nevitt; Paula J Bowman; Kristine E Ensrud Journal: J Am Geriatr Soc Date: 2004-09 Impact factor: 5.562