The aim of this study was to lengthen the sheep mandible with a fully buried device and to quantitatively analyze the tissue regenerate in the distraction gap by means of two-dimensional and three-dimensional histomorphometry. A custom-made device for continuous distraction was used in five adult sheep and fixed with three bicortical screws on either side of an osteotomy, anterior to the premolar region of the mandible. A cable-connected power and control unit was implanted in the neck region. After a 5-day latency period, distraction was activated every 2 hours and advanced at a rate of 1.01 mm per day. The distraction period was planned for 14 days, but because of stability problems and cable breakage, the actual distraction period ranged from 2 to 17 days, resulting in gap distances from 1.7 to 17.1 mm (mean, 0.95 mm/day). Osteogenesis was followed by radiographic imaging, and after a 6-week consolidation period, the harvested mandibles were serially sectioned for histologic and two-dimensional histomorphometric analysis, with three-dimensional reconstruction. Histologic examination of the specimens demonstrated predominantly membranous bone formation with remodeling bridging the distraction gap mainly in the periosteal region of the lingual side. In addition, cartilaginous areas and chondral bone formation were observed where the bridging appeared incomplete. Because of device fixation on the buccal side of the mandible, the preservation of the lingual periosteum seemed to play the major role for sufficient bone repair in the distraction gap. Cartilage within the distraction gap suggests fixation instability in this animal model.
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http://dx.doi.org/10.1097/00006534-200207000-00023 | DOI Listing |
Trials
January 2025
Department of Pediatric Surgery, Inselspital University Hospital, Bern, CH, 3010, Switzerland.
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January 2025
Department of Plastic and Reconstructive Surgery, Shanghai 9th People's Hospital, School of Medicine, Shanghai Jiao Tong University.
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View Article and Find Full Text PDFInt J Ment Health Syst
January 2025
Department of Prevention and Evaluation, Leibniz Institute for Prevention Research and Epidemiology, Bremen, Germany.
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December 2024
Harvard Medical School, Boston, USA.
Simulation program staff and leadership often struggle to partner with front-line healthcare workers, their managers, and health system leaders. Simulation-based learning programs are too often seen as burdensome add-ons rather than essential mechanisms supporting clinical workforce readiness. Healthcare system leaders grappling with declining morale, economic pressure, and too few qualified staff often don't see how simulation can help them, and we simulation program leaders can't seem to bridge this gap.
View Article and Find Full Text PDFNicotine Tob Res
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Addictions and related-Research Group, Sangath, Porvorim, Goa, India.
Introduction: Tobacco consumption is a leading cause of mortality globally. Eighty percent of these deaths occur in low- and middle-income countries (LMICs). Despite this, there is a large treatment gap due to both demand and supply-side barriers.
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