Orientadores: Paulo César Rodrigues Palma, Cássio Luís Zanettini Riccetto / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas / Made available in DSpace on 2018-08-26T04:00:44Z (GMT). No. of bitstreams: 1 Souza_RicardoSantos_M.pdf: 13317413 bytes, checksum: 0a96e1d0f200ad24527de159c56d6023 (MD5) Previous issue date: 2014 / Resumo: Introdução e hipótese: O implante de slings corresponde ao padrão atual de tratamento da incontinência urinária de esforço. Para sua eficácia, exigem um mecanismo de ancoragem adequado. O objetivo deste estudo foi comparar as características biomecânicas de sistemas de fixação de dois modelos de mini slings atualmente disponíveis no mercado (Ophira® e Mini Arc®) por meio de teste de tração uniaxial em modelo murino ex vivo. Materiais e Métodos: Os dispositivos de ancoragem dos mini sling foram implantados cirurgicamente na parede abdominal de 15 ratos divididos em três grupos de cinco animais. Estes grupos foram sacrificados de acordo com a data pós implante em 7, 14 e 30 dias. Na sequência, extraia-se em bloco a parede abdominal de cada animal contendo os dispositivos de fixação. Este material era submetido a teste de tração até o despreendimento do sistema de ancoragem a partir do tecido leito de implante. Foram determinadas a medida da carga máxima (N) e deformação total (mm) até a avulsão. Os resultados foram comparados por meio do teste t de Student e o valor de p 5% foi considerado significativo. Resultados: O sistema de fixação do mini sling Ophira® em comparação ao Mini Arc® exigiu maior carga máxima para avulsão do tecido abdominal nos 3 períodos avaliados com significância estatística: 7º dia, 5,14 ± 0,69 N versus 4,11 ± 0,81 N (p 0,037), 14º dia 10,64 ± 0,81 N contra 9,02 ± 0,54 N (p 0,001) e no 30º dia 18,76 ± 1,48 N versus 14,85 ± 1,28 N (p < 0,001), respectivamente. Quanto ao deslocamento ocorrido durante a tração, o Ophira® desenvolveu maior deflexão significante em todos os momentos avaliados: no dia 7, 11,14 ± 0,53 mm enquanto o Mini Arc® 7,89 ± 1,01 mm (p 0,001), no dia 14 15,80 ± 0,95 mm versus 12,49 ± 1,43 mm (p < 0,001) e no trigésimo dia os valores foram 23,95 ± 1,38 mm contra 18,24 ± 0,50 mm (p < 0,001), respectivamente. Conclusão: O dispositivo de ancoragem do mini sling Ophira® proporcionou melhor fixação à parede abdominal murina em relação ao do Mini Arc®. Este resultado foi mantido mesmo no período pós-operatório tardio / Abstract: Introduction and hypothesis: Slings are currently the standard treatment for stress urinary incontinence. To be effective, they require an adequate anchoring system. The aim of this study is compare the biomechanical features of fixation systems of two mini slings models currently available on the market (Ophira¿ and Mini Arc¿). Materials and Methods: Anchoring devices of each sling were surgically implanted in the abdominal wall of 15 rats divided into three groups of five animals. These groups are formed according to the date of post implant euthanasia on 7, 14 and 30 days. Each abdominal wall was extracted in block containing the mini sling fixation device and was submitted to a tensile strength test for measure the maximum load and total deflection until device avulsion from the tissue. The results were compared using Student test t and a 5% cut off was considered significant. Results: The Ophira¿ mini sling fixation system demanded a greater maximum load compared to the Mini Arc¿ for avulsion of abdominal tissue in 3 evaluation periods with statistical significance: 7th day, 5.14 ± 0.69 versus 4.11 ± N 0,81 N (p 0.037), on day 14 10.64 ± 0.81 N versus 9.02 ± 0.54 N (p 0.001) and on day 30 18.76 ± 1.48 N versus 14.85 ± 1.28 N (p <0.001), respectively. Regarding the displacement occurred during traction, the Ophira¿ has developed significant higher deflection at all times evaluated: on day 7, 11.14 ± 0.53 mm while the Mini Arc¿ 7.89 ± 1.01 mm (p 0.001), on day 14 15.80 ± 0.95 versus 12.49 mm ± 1.43 mm (p <0.001) and on day 30 the values were 23.95 ± 1.38 mm vs. 18.24 ± 0.50 mm (p <0.001), respectively. Conclusion: The Ophira¿ mini sling anchoring device provided better fixation to the host tissue site compared to the Mini Arc¿ device in rats. This outcome were maintained even in the late post operative period / Mestrado / Fisiopatologia Cirúrgica / Mestre em Ciências

Le but de ce travail était la mise en place d’une chaîne méthodologique de planification virtuelle d’une ostéotomie sagittale des branches mandibulaires (OSBM) et son transfert au bloc opératoire. Dans la première partie, les méthodes classiques de planification et de transfert sont exposées. Habituellement réalisées à partir de modèles en plâtre sur articulateur, la planification et la production de guides occlusaux chirurgicaux souffrent d’une imprécision potentiellement à l’origine de troubles fonctionnels temporo-­‐mandibulaires. Le contrôle per-­‐opératoire du condyle mandibulaire lors de l’OSBM est un élément de stabilité squelettique dont dépend la qualité du résultat fonctionnel. Une évaluation des pratiques professionnelles des chirurgiens maxillo-­‐faciaux a été réalisée sur ce point. Une méthode de positionnement condylien utilisant un dispositif, moins fréquemment utilisée que la méthode empirique, est proposée comme présentant le meilleur rapport bénéfice/risque. Cette méthode a été reproduite virtuellement à travers les différents maillons de la chaîne méthodologique. Des techniques innovantes informatisées d’acquisition, de conception et modélisation, et d’impression en 3 dimensions ont été utilisées. Dans la seconde partie, la méthodologie de chacun des maillons de la chaîne a été présentée et évaluée, soit sur sujets cadavériques, soit sur patients. L’objectif était de démontrer la faisabilité de la chaîne. Le maillon « acquisition et extraction de surface » a mis en exergue le problème des artéfacts dus aux matériaux métalliques dentaires ou orthodontiques. Dans 90% des cas le maillage obtenu était satisfaisant, permettant de s’affranchir des modèles en plâtre. Le maillon « planification chirurgicale virtuelle » a montré une valorisation par rapport à la technique classique en terme de prévention des interférences des pièces osseuses déplacées. Le maillon « modélisation et impression du guide chirurgical » a décrit les étapes d’invention d’un guide de positionnement occlusal et condylien (OCPD : occlusal and condylar positionning device). Ses caractéristiques techniques, ses modalités de production par impression 3D ainsi que son utilisation peropératoire, ont été précisées. Enfin le maillon « évaluation de l’OCPD » a permis de montrer la faisabilité de la méthode et l’équivalence clinique, technique et biologique de ce dispositif médical sur mesure par rapport à ceux utilisés dans la méthode classique. Enfin le positionnement condylien obtenu grâce à ce dispositif a été évalué de manière préliminaire et comparé aux données de la littérature. Grâce à l’OCPD, nous avons montré la possibilité de transférer au bloc opératoire la planification virtuelle d’une OSBM contrôlant la position des condyles / The purpose of this work was the implementation of a methodological chain for bilateral sagittal split osteotomy (BSSO) virtual planning and its transfer in the operating room. In the first part of the work, usual methods for planning BSSO are exposed. Usually realized from plaster models on articulator, the planning and the occlusal surgical guides production are at risk of temporo-­‐mandibular functional disorders. The quality of the functional result depends on the correct positioning of the mandibular condyle, considered as a skeletal stability element. An assessment of the maxillofacial surgeons practices was realized regarding intra-­‐operative condyle positioning. Using a condylar positioning device (CPD),less frequently employed than the empirical method, meets an acceptable benefit/risk balance. This method was virtually reproduced through various steps of the methodological chain described. Computerized innovative techniques for three-­‐dimensional acquisition, design and manufacturing were used. In the second part of the work, the methodology of each step of the chain was presented and estimated, either on cadaveric subjects, or on patients. The aim was to demonstrate the feasibility of the whole chain. The “acquisition and surface extraction” step pointed the issue of artefacts due to dental or orthodontic metallic devices. Ninety % of the obtained meshes were satisfactory, allowing not to use plaster models. The “virtual surgical planning” step allowed reproducing the usual method and showed great interest in bone interferences prevention. The “modelling and printing of the surgical guide” step described the stages of occlusal and condylar positioning device (OCPD) invention. Its technical characteristics, its methods of manufacturing by 3D printing, and its intraoperative use were specified. The step “OCPD evaluation” showed the method feasibility and the clinical, technical and biological equivalence of this custom-­‐made medical device as compared to those used in the usual method. Finally the condylar position obtained with this device was estimated in a preliminary clinical study and compared with the literature. Thanks to the OCPD, we showed the possibility of transferring in the operating room an OSBM virtual planning controlling condyles position.