Abstract
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. 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. 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. The resorbable mini-plates provided a fixation stable enough to allow immediate oral alimentation and callus formation in both groups.
Highlights
Resorbable fixation systems are biologically inert, which offers great advantages while avoiding the need to remove the implanted material
Twenty hemimandibles of ten rabbits were divided into two groups according to duration of resorbable fixation—one or three months
The mandibular vertical body osteotomies (MVBO) were performed and one four-hole, resorbable, 2.0mm mini-plate fixation system was used on each side
Summary
Resorbable fixation systems are biologically inert, which offers great advantages while avoiding the need to remove the implanted material. .Favorable fracture healing has been observed in osteosynthesis with biodegradable systems in adults. .Favorable fracture healing has been observed in osteosynthesis with biodegradable systems in adults2-5 They have been used in midfacial fractures as well as maxillary and mandibular osteotomies in orthognathic surgery. The use of resorbable fixation systems for osteosynthesis is currently a controversial issue in the literature. Various studies have been published regarding the disadvantages of biodegradable osteosynthesis materials, varying from less stabilization to more difficulty in handling[4,9]. Many reports have shown that resorbable osteosynthesis yields comparable results in terms of stability and relapse[10,11,12,13]
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