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.
Key words:
Absorbable Implants. Tomography; X-Ray Computed. Mandibular Fractures. Osteotomy. Microscopy; Electron Scanning. Rabbits.
