Miniplate osteosynthesis with four different systems in sheep |
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Authors: | R. Gutwald,R. Schö nM. Metzger,K. KreutzerB. Rahn,R. SchmelzeisenS. Sauerbier |
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Affiliation: | 1 Department of Oral and Craniomaxillofacial Surgery, University Hospital Freiburg, Freiburg, Germany 2 AO/ASIF (Association for the Study of Internal Fixation), Davos, Switzerland |
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Abstract: | The aim of this study was to compare a combination of a locking system with self-tapping (ST-L) or self-drilling-tapping (SDT-L) screws with a combination of conventional miniplates with self-tapping (ST) and self-forming (SF) screws. A standardized osteotomy and osteosynthesis with one of the above mentioned systems was performed in 24 sheep. Callus formation was measured with the help of CT scans assisted by a navigation system. Specimens of each osteotomy gap were taken and examined histologically. The best results were observed when self-tapping screws and the Mini-Locking-System (ST-L) were applied. The slowest healing was seen in animals treated with miniplates and SF screws. After 8 weeks an increase in bone formation could be observed in the ST, SF, SDT-L systems. The results after 8 weeks were comparable with those achieved by the ST-L system after 4 weeks. The improved stability of the osteosynthesis with the ST-L system resulted in early ossification of the osteotomy gap and the smallest amount of callus formation. |
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Keywords: | miniplate osteosynthesis mandible internal fixation mandibular fracture Mini-Locking-System |
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