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Acta cir. bras ; 31(6): 364-370, tab, graf
Article in English | LILACS | ID: lil-785015

ABSTRACT

ABSTRACT PURPOSE: To compare bone healing in mandibular vertical body osteotomies (MVBO) after fixation with a resorbable 2.0mm-profile fixation system in the first and third postoperative months in rabbits. METHODS: Twenty hemimandibles of ten rabbits were divided into two groups according to duration of resorbable fixation-one or three months. The MVBOs were performed and one four-hole, resorbable, 2.0mm mini-plate fixation system was used on each side. The computed tomography (CT) scans, scanning electron microscopy (SEM), and histomorphometric outcomes of groups I and II were compared. RESULTS: Significant differences were found between the one- and three- month assessments in terms of newly formed bone ratio values (p<0.05). There was more new bone formation at the third month on both the CT and histomorphometric examinations. A better adaptation of the bone tissues to the resorbable mini-plate and screws was observed on SEM at three months. CONCLUSION: The resorbable mini-plates provided a fixation stable enough to allow immediate oral alimentation and callus formation in both groups.


Subject(s)
Animals , Female , Rabbits , Wound Healing/physiology , Internal Fixators , Absorbable Implants , Mandibular Osteotomy/rehabilitation , Osteogenesis/physiology , Postoperative Period , Bone and Bones/pathology , Bone and Bones/ultrastructure , Microscopy, Electron, Scanning/methods , Tomography, X-Ray Computed/methods , Bone Remodeling/physiology , Models, Animal , Mandibular Osteotomy/instrumentation
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