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Evaluation of bone gain through computerized microtomography images through use of different titanium meshes associated with particulate bovine bone graft and collagen membrane - study in rats
EAO Online Library. Faria P. Oct 9, 2018; 232732; P-SU-39
Paulo Faria
Paulo Faria
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After loss of the dental element, the alveolar process undergoes significant changes, among them, the gradual reduction of the bone volume, making the edentulous region occupied by trabeculae of lamellar bone. This reduced amount of bone tissue in the alveolar ridges has been one of the great challenges in aesthetic-functional recovery in patients who have suffered dentoalveolar trauma, dental extractions, congenital dental absence, maxillary and mandible pathologies and infections.The aim of this study is to evaluate differences in quality of bone tissue through use of two types of titanium mesh, associated or not to collagen membrane, through in vivo computerized microtomography analysis.This study was previously approved by the Ethics and Research Committee on animals. Ten male Wistar rats weighing 400 grams were used. Two titanium meshes were used- Bionnovation® with perforations of 0.85 mm in diameter (Group 1+ n = 4) and Bionnovation® with perforations of 0.15 mm in diameter (Group 2+ n = 6). The animals were anesthetized with ketamine and xylazine, according to individual weight. In all animals, the meshes were placed and screwed into the femur, associated with bovine bone graft (BioOss Collagen - Geistlich ®). In one of the femurs, collagen membrane (BioGide-Geistlich®) was added, randomly. The surgical wound was sutured with Vycril® 5.0 suture. The animals were submitted to microtomographic evaluation in vivo after 1 and 30 days of the procedure. At day 30, the animals were euthanized. The analyzes measured were of bone volume and density. The data were analyzed in BioEstat 5.0 software using t-test for intra and intergroup comparisons. For intergroup evaluations, bone volume differences of 4.5 ± 3.3 in Group 1 and -1.8 ± 4.2 in Group 2 were observed only in the femur in which the collagen membrane was used. For the density parameter, no statistical differences were observed between the groups. For intra-group evaluations, volume differences were observed after 30 days in Group 2, in femurs in which the collagen membrane (-5.1 ± 4.8) was not used, and a lower density after 30 days (-0.007 ± 0.02).Through the results, it can be concluded that presence of collagen membrane assisted in the maintenance of bone volume. In addition, titanium meshes with smaller diameter perforations demonstrate bone formation of lower volume and density due to reduced supply to underlying bone tissue.
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