Tesi sul tema "Implants osseux"
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AUBER, GUILLAUME, e Michel Macé. "Les implants endo-osseux en 1987". Rennes 1, 1987. http://www.theses.fr/1987REN1D015.
Testo completoVayron, Romain. "Remodelage osseux et stabilité d'implants". Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1145.
Testo completoDue to the increase of life duration and to the frequency of certain types of accidents, the problematic of the evolution of joints and aging bone has become crucial, leading to an important number of surgical interventions requiring implant placement. Although these interventions are carried out routinely in the clinic, there are still risks of surgical failure, which induce dramatic consequences for the patient. Despite the evolution of the surgical strategies, the implants failure rate remains important because the phenomena involved are not well understood due to their complexity and to their multi-scale nature. One of the main determinants of the success of these surgical interventions lies in the implant osseointegration, that is to say the ability of bone tissue to regenerate around the implant integrating the implant in a sustainable manner. The surgical success depends primarily on the physical characteristics of the bone-implant interface transmitting the biomechanical efforts, which play a major role in bone remodeling. The approach carried out in the present research consist in developing a multimodal experimental approach to characterize the biomechanical properties of the bone-implant interface in order to assess the impact of bone remodeling around the implant on the mechanical response of the implant. In the first part, a multiphysical approach is carried out using a dedicated animal model. Coin-shaped titanium implants are implanted in vivo on the proximal part of the tibia of rabbits during different periods of healing time. A nanoindentation device is used to measure the mechanical properties of the newly formed bone at the microscopic level. A micro-scattering Brillouin device is employed to estimate the ultrasonic velocity of newly formed bone at the same scale. The results obtained with both techniques are used to determine the difference of bone mass density difference between mature bone tissue and newly formed bone tissue for different healing times.In the second part, an ultrasonic device aims at investigating the stability of titanium dental implants. The ultrasonic response is measured in echographic mode and is shown to be sensitive to the properties of the material (bone, biomaterial) in contact with the implant. Firstly, the evolution of the in vitro ultrasonic response of dental implants inserted into a bioactive dental substitute (tricalcium silicate based cement) and loaded using a mechanical protocol stress is assessed. To do so, a mechanical fatigue bench simulating chewing motions was developed. Secondly, the same ultrasonic device is used to determine in vitro the primary stability of an implant placed into bovine bone tissue. Third, an in vivo study using an animal model (rabbit) investigates the effect of healing time on the ultrasonic response of the implant. The ultrasound device is used to quantify the primary and secondary dental implant stability. The phenomena of ultrasonic propagation in the implant are modeled using techniques of numerical simulations by finite elements. The simulations show the potential of the technique to monitor changes in several key parameters for osseointegration of the implant under controlled conditions
Chatard, Jean-Michel. "Etude des solutions prothétiques sur les implants endo-osseux : application aux implants en céramique alumineuse". Bordeaux 2, 1992. http://www.theses.fr/1992BOR20006.
Testo completoValentin, Bianco Isabelle. "Etude des contraintes à l'interface implant dentaire/tissus osseux". Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22089.
Testo completoCordova, Jara Luis. "Microenvironnement osseux et ostéolyse : application au descellement aseptique des implants orthopédiques". Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=5fd80b3c-4cf9-4de6-94cd-04ac507ed372.
Testo completoProsthetic joint replacement is one of the most successful procedure performed today, however 10-20% of patients show periprosthetic osteolysis induced by wear particles released from bearing surfaces at 10 years leading to the surgical revision of the prosthesis. In this regard, the long-term survival of joint implants continues to be a major challenge in orthopedic research. Thus, a better understanding of the pathophysiology of periprosthetic osteolysis induced by wear particles is essential for the development of new therapeutic strategies. This report provides an overview of current concepts of osteoimmunology applied to periprosthetic osteolysis and aseptic loosening of orthopedic implants. In the experimental part, this study aims to deep in the understanding of mechanisms of osteolysis by a) identifying cell populations of human periprosthetic membranes retrieved from surgical revisions, b) reproducing the inflammatory and osteolytic changes in a calvaria mouse model and evaluating the interference of RNA targeting the receptor activator of nuclear factor kappa B (RANK) as a new therapeutic approach for this condition and, finally, c) evaluating the interactions between polyethylene nanoparticles and human CD14+ monocyte/macrophages at cellular level
DIRARKILIAN, HAIK. "Les implants lames : etude synthetique dans un service hospitalier parisien". Paris 5, 1990. http://www.theses.fr/1990PA05M056.
Testo completoAbillama, Magid. "A propos de l'implant C. B. S. . Et de la lame de Linkow : historique, biomécanique, sélection des patients, terminologie, (cas cliniques)". Bordeaux 2, 1988. http://www.theses.fr/1988BOR20074.
Testo completoSananes, Véronique. "A propos de l'implant C. B. S. . Et de la lame de Linkow : historique, bio-intégration, prothèse, (cas cliniques)". Bordeaux 2, 1988. http://www.theses.fr/1988BOR20075.
Testo completoRozé, Julie Hoornaert Alain Saffarzadeh Kermani Afchine. "Architecture osseuse et stabilité implantaire analyse pré-clinique /". [S.l.] : [s.n.], 2007. http://castore.univ-nantes.fr/castore/GetOAIRef?idDoc=28176.
Testo completoNaim, Souad. "Implantation d'un phosphate tricalcique sous la capsule rénale du rat". Toulouse 3, 1994. http://www.theses.fr/1994TOU30218.
Testo completoBoix, Damien. "Etude de la biofonctionnalité d'un substitut osseux injectable : applications en implantologie orale". Nantes, 2003. http://www.theses.fr/2003NANT28VS.
Testo completoCompared with the techniques of differed implantation, dental implant placement in same operational time that the extraction increases the comfort of the patient since it requires only one surgical operation and that it allows an earlier prosthetic rehabilitation. The immediate implantology remains however a less used technique. Indeed the no-concordance between the implant morphology and that of the socket generates the existence of a bone gap which can compromise the final success of the intervention. The objective of this work was to develop an injectable bone substitute (IBS) to support the osseointegration of dental implants. Previousiy developed in the laboratory INSERM 99-03, the IBS is a composite of calcium phosphate granules (BCP) with a cellulosic derivative (hydroxy-propyl-methyl-cellulose [HPMC]). Firstly, it was checked that the physicochemical properties of this bone substitute fitted with the product specifications for a peri-implant application. Two preclinical trials were then led in order to determine the best compromise between injectability and granulometry. A first animal experiment was carried out on socket filling, to check the efficacy of IBS containing BCP granules with a granulometry ranging between 200 and 500 [micro]m. The osteoconductive properties of the IBS could thus be evaluated and it was shown that this biomaterial prevented the alveolar crest resorption after dental extraction. With regards to the kinetics of resorption higher than the usually recommended periods of bone healing, the 200/500 [micro]m granulometry seemed incompletely adapted to oral implantology. A second study with IBS containing BCP granules ranging between 40 and 80 [micro]m, has then shown that this biomaterial supported the osseointegration of implants immediately placed after extraction. Indeed, in addition to its rheological properties adapted to the clinical situation, IBS 40/80 [micro]m allowed a rapid bone ingrowth around the implant with complete resorption of the biomaterial. Viewed together, these results highlight the possibility to use IBS as an alternative to autologous bone graft and tissue guided regeneration in immediate dental implantology
Faudemer, Gonzague. "Contribution de l'analyse mécanique à l'étude des implants et des biomatériaux dentaires". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00841306.
Testo completoZAHRAOUI, CHOUKRI. "Greffage de biomolecules sur un nouveau biomateriau a base d'hydroxyapatite : application aux implants osseux". Toulouse 3, 1999. http://www.theses.fr/1999TOU30239.
Testo completoGineste, Laurent. "Etude comparative de l'ostéointégration d'implants dentaires recouverts de différents phosphates de calcium". Toulouse 3, 1993. http://www.theses.fr/1993TOU30106.
Testo completoBosc, Romain. "Impact des tissus mous sur les méthodes acoustiques d’évaluation de la stabilité des implants osseux". Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC0009.
Testo completoAbstract:This work studies the biomechanical behavior of a cadaveric model and an in vitro model of total hip arthroplasty. We sought to highlight and study parameters that could allow us to have a method of objective analysis of the stability of the acetabular cup implant.The first part describes the context of the study. We have emphasized the different methods of analysis that make it possible to analyse the stability of a bone implant. Indeed, despite the daily use of implants, the failure rate of osseointegration remains high and failures still happen due to inadequate mechanical behavior of the prosthesis.Among the identified causes of failure, aseptic loosening of the acetabular cup after hip arthroplasty may be related to a primary defect in stability, not achieved during the surgical procedure. It has been shown that loosening of the acetabular cup may result from poor primary stability between the prosthetic cup and the surrounding bone.A method of estimating primary stability could allow the orthopaedic surgeon to better control the stability of the implants he poses in the operating room.The main purpose of this thesis work was to study the impact signals on the prosthetic acetabulum.Firstly, we carried out a study of the insertion of the cup by impacts on a cadaveric model. A correlation was found between impact time and stability (R2 = 0.69). This experimental study has thus shown the potential of the impact signal processing method in predicting the primary stability of the acetabular cup. But we observed changes between the signals obtained on the different subjects. We hypothesized that these changes were related to soft tissue variation between subjects.The third part of this thesis focused on analysing the biomechanical behavior of our model in the presence of soft tissues.We used again the in vitro model that we had developed and added in the impaction system turkey slices of varying thickness.The purpose of this second study was to integrate the parameter related to the existence of a variable thickness of soft tissues in the dynamic interaction between the hammer, the ancillary (and the cup) and the bone tissue during the insertion. The mean and standard deviation of the Im indicator obtained for all samples and configurations at a soft tissue thickness value of 10 mm (30 mm) was 0.592 ± 0.141, (respectively 0.552 ± 0.139). Statistical analysis showed that there was no significant effect of the value of soft tissue thickness on the values of the Im indicator (F = 3.16, p = 0.08). Despite the obvious limitations of an in vitro study on a partial model of total hip arthroplasty, these results, as well as the previous results obtained on anatomical subjects, show the feasibility of developing a medical device dedicated to estimating the stability of the acetabular implant and which could be used as a decision support system by the orthopaedic surgeons
Bouyssié, Jean-François. "Modélisation des déficits osseux par stéréolithographie. Etude sur la précision dimensionnelle et surfacique du procédé". Toulouse 3, 1996. http://www.theses.fr/1996TOU30160.
Testo completoChatard, Isabelle. "Approche clinique de l'implantologie à travers l'étude d'un implant en céramique alumineuse". Bordeaux 2, 1992. http://www.theses.fr/1992BOR20005.
Testo completoCabantous, Vincent. "A propos de la réhabilitation orale d'une mandibule édentée par implants C. B. S : illustration par un cas clinique". Bordeaux 2, 1988. http://www.theses.fr/1988BOR20034.
Testo completoPiotrowski, Bernard. "Apport des substituts osseux synthétiques en régénération osseuse post-extractionnelle et péri-implantaire". Toulouse 3, 2006. http://www.theses.fr/2006TOU30006.
Testo completoThe aim of the thesis is to evaluate the contribution of certain bone substitutes in bone regeneration. The first part is a literature review on immediate implantation and synthetic bone substitutes. The second part consists of an animal experiment focussed on the study of the behaviour of two synthetic materials. The first is a Calcium phosphate combining one HA and one tricalcic b, used in post-extraction socket filling. The second, a bioglass, was placed in post-extraction sockets and around immediate implants. Histological observation confirmed the biocompatibility of both materials, evaluated their resorption, their osteoconductive properties and their role in bone wound healing. Considering the specificity of the animal model, the advantage of using synthetic bone substitutes in post-extraction socket filling is discussed as well as the opportunity of immediate implantation
ASSAF, JOSEPH. "Formes cliniques des implants endo-osseux et etude de la biocompatibilite des materiaux utilises en implantologie orale". PARIS 6, DENTAIRE, 1988. http://www.theses.fr/1988PA06H009.
Testo completoGUEZ, JEAN-LOUIS. "Etude de contraintes sur des implants vis mandibulaires : analyse comparative par elements finis selon le profil de filetage". Paris 7, 1992. http://www.theses.fr/1992PA07GS01.
Testo completoKERORGANT, YVES, e OLIVIER ROZUEL. "Contribution a l'etude de la corrosion et de la relation epithelio-implantaire des implants endo-osseux en titane". Rennes 1, 1987. http://www.theses.fr/1987REN1D021.
Testo completoLe, Guennec Benoît Hoornaert Alain. "Impact du remodelage osseux crânio-facial sur l'esthétique à long terme de la prothèse implanto portée unitaire du secteur maxillaire antérieur". [S.l.] : [s.n.], 2008. http://castore.univ-nantes.fr/castore/GetOAIRef?idDoc=50416.
Testo completoDidier, Paul. "Solutions matériaux et géométriques pour la réalisation de dispositifs médicaux implantables sur-mesure en alliages de titane : application aux implants endo-osseux et supra-osseux obtenus par fabrication additive". Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0262.
Testo completoThe use of Titanium-based implantable medical devices, mainly Ti-6Al-4V alloy, significantly increased in recent decades. From a biological and chemical point of view, some elements of this alloy, such as vanadium and aluminum, are considered potentially toxic. From a mechanical point of view, Ti-6Al-4V is significantly more rigid than the cortical bone on which the prostheses/implants are attached. This difference in stiffness between the bone and the implant is at the origin of a stress deviation, called "stress-shielding", that can finally lead to loosening of the device due to bone loss. The aim of this thesis is to provide solutions for both the choice of implantable medical devices’ material and geometry, improving the transfer of charge at the interface. The dental field, where loads are important, is an appropriate environment for the implementation of these material and geometric solutions. Two types of devices are thus considered in this study: endo-osseous implants and bone plate supra-osseous implants. The positioning of conventional implants, termed endo-osseous, is evaluated with regard to the peri-implanted bone by a multiparametric numerical study, taking into account mechanical criteria. Otherwise, the supra-osseous implants are used for the rehabilitation of complete dental arches of patients with more atypical pathologies, especially when the placement of endo-osseous implants is not possible. The need to have individualized shapes to patients’ anatomy fully justifies a realization by Selective Laser Melting additive manufacturing. However, this approach requires attention in all aspects of the value chain of medical devices realization by metal additive manufacturing. In the design stage, it is not only a matter of a taking into account the mechanical strength of the implanted device but also topologically optimizing its geometry with regard to the stresses applied to the bone, to minimize stress-shielding effect. Moreover, the development of these custom-made devices has to necessarily take into account post-manufacturing finishing operations by subtractive processes. These functionalization steps still constitute a hurdle that limits the use of additive manufacturing. The problems of finishing by machining the custom-made parts are related to the transfer between the additive manufacturing machine and the machining center. The idea developed in this study is to use additive manufacturing supports as a custom-made machining fixture. To anticipate the potential instabilities during this finishing operations, a numerical model is developed and coupled with an analytical model for determining cutting forces in peripheral milling. Finally, the control of the surface quality of the devices resulting from the SLM process by sandblasting and tribofinishing is investigated, in connection with a biocompatibility study
Pomar, Philippe. "Nouvelle approche de la réhabilitation prothétique après maxillectomie". Toulouse 3, 1993. http://www.theses.fr/1993TOU30103.
Testo completoRomanos, Georgios. "Immediate loading of endosseous implants in the posterior mandible animal and clinical studies /". London ; Chicago : Quintessence, 2005. http://catalog.hathitrust.org/api/volumes/oclc/57431031.html.
Testo completoDe, La Rosa Castolo Guillermo. "Analyse de la tenue mécanique des implants, des composants prothétiques et de l'interaction avec les tissus osseux en implantologie dentaire". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0700/document.
Testo completoThe research purpose in this study is to develop of mechanical evaluation methods to dental implants, their prosthetic components and the interactions with bone tissues in mandible zone. According to the World Health Organization (WHO), 15 to 20% of population from 35 to 44 years old is reached of partial edentulism problems and about 30% of population from 65 to 74 years old is reached of complete edentulism problems. This represents approximately 7 million people in France who have lost teeth during their lifetime. Treatments proposed by dental implantology have become effective solutions for edentulous patients with clinical success rates greater than 90%. However, clinical complications exist, characterized by inflammation or partial losses of the surrounding tissues. Dentists are responsible for the treatment choice for their patients; an appropriate decision is crucial and requires an understanding of the benefits and risks. In this context, a first methodology was developed for evaluated the endosseous dental implants under the conditions of the ISO 14801 certification standard. This methodology is based with an approach numerical by Finite Element Analysis (FEA). Furthermore, theoretical approaches and clinical data were used to evaluate the mechanical resistance of the bone tissues in the jaw with different dental implant configurations and their prosthetic components
Guérin, Gaëtan. "Modélisation des interactions mécanobiologiques dans la phase de cicatrisation de l'interface os-implant". Toulouse 3, 2009. http://thesesups.ups-tlse.fr/759/.
Testo completoWe hypothesized that explicitmodeling of mechanobiological interactions could be helpful to make progress in the investigation of periprosthetic healing. The governing equations were based upon the coupling of poroelasticity with cellular migrations in presence of growth factors to obtain a multiphasic model of reactive transport. The role of implant in tissue healing was evaluated using a dedicated experimental implant as reference. A multiscale approach allowed cellular interaction to be locally studied. We focused on local osteogenic role of implant surface, mechanical unstability stimuli and clinical aspects through defects of localization and shape of interface. The results were in good agreement with healing patterns observed in experiments and clinical setting. This confirmed the reliability of our original research approach
Biotteau, Florian. "Impression 3D de céramiques phosphocalciques dopées : applications en régénération tissulaire osseuse". Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2024. http://www.theses.fr/2024UCFA0044.
Testo completoAdditive manufacturing is a recent shaping method that allows for the creation of innovative structures and customization of parts. These two aspects are of interest for the medical field to improve the osteointegration properties of bone substitutes in a focused reflexion on a personalized medicine tailored to each patient's needs allow an improvement in the quality of life. In this context, the orthopaedic surgeons of the team “Matériaux Pour la Santé” from “Institut de Chimie de Clermont-Ferrand” have identified the ceramic bone substitutes, particularly calcium phosphate substitute, in response to their needs. The necessary equipment, from the preparation of ceramic powder to the thermal treatment of parts, was acquired through funding from European Regional Development Fund and various public procurement procedures within the scope of this thesis. This led to the acquisition of a grinder, two additive manufacturing printers, a tubular furnace and three muffle furnaces. Two complementary technologies of ceramic additive manufacturing have been set up, the stereolithography and the digital light projection. Both are using a photosensitive ceramic loaded resin which is removed during a thermal treatment. The ceramic used is a calcium deficient hydroxyapatite either doped with copper at 1% atomic proportion of calcium or undoped, the copper doping having shown antibacterial activity. This ceramic is decomposed into a biphasic mixture of hydroxyapatite and tricalcium phosphate (60/40) after thermal treatment. Both powders have been synthesized in batches of 2 kg at “Centre Ingénierie et Santé de Saint-Etienne”. The influence of the preparation steps on the final parts has been studied through various milling of powder, with or without additives and various incorporation methods of ceramic into a commercial organic photosensitive mixture. Printing with both initial powder and thermally treated powder revealed differences in densification leading to notable changes in microstructure. The influence of sintering temperature on the chemical composition and crystallochemistry of the parts was primarily investigated using X-ray diffraction accompanied by Rietveld refinement, enabling the determination of the mass percentages of the different phases present. The spatial distribution of these phases was studied to better understand the behaviour of bone substitute during their biological degradation and the impact of this degradation on the structural integrity of the substitute. Programs have been developed to enable the structuring of any initial form with various geometric structures, such as triply periodic minimal surfaces. These programs have facilitated a better understanding of the digital aspect of 3D printing and the structuring of bone substitutes derived from cases previously encountered by team's surgeons, which have been printed with commercially available hydroxyapatite to validate the proof of concept. Two case studies have been explored: one involving humeral head depression and the other involving complex acetabular reconstruction during a total hip revision
Himdani, Kadhim al. "L'implant lame stabilisé : étude clinique et expérimentale dans un service hospitalier parisien". Paris 7, 1985. http://www.theses.fr/1985PA07F014.
Testo completoGrosgogeat-Balayre, Brigitte. "Contribution à l'étude de la corrosion galvanique entre un implant dentaire à base titane et sa suprastructrure". Lyon 1, 1995. http://www.theses.fr/1995LYO1U224.
Testo completoStéphan, Grégory. "Prothèse complète mandibulaire à compléments de rétention implantaire : étude comparative entre mise en charge immédiate et mise en charge différée". Aix-Marseille 2, 2007. http://www.theses.fr/2007AIX21601.
Testo completoGracia, Alain. "Les impératifs en prothèse adjointe complète : apports des racines sous-prothétiques et des techniques implantaires". Bordeaux 2, 1994. http://www.theses.fr/1994BOR2OC02.
Testo completoMoreau, David. "Elaboration et caractérisation de films d’hydrogel et de composites hydrogel-céramique pour les applications biomédicales". Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM015/document.
Testo completoThe replacement of soft osteoarticular tissues by synthetic hydrogel implants is often limited by a weak anchorage to bone tissues. One approach to strengthen the bone-implant interface consists in functionalizing the surface of the implant by a coating of bioceramics. In this thesis, we investigate two approaches to coat hydrogels of poly(vinyl alcohol) (PVA) with ceramic particles of hydroxyapatite (HA). In a first “soft” process, based on dip-coating, hydrogel substrates were coated with hydroxyapatite particles embedded in a non-degradable PVA hydrogel matrix. In this process, the control of the soaking solution composition allows to finely tune the thickness, the cohesion and the adhesion of the coating, as well as the HA exposure at the coating surface. The biocompatibility with surgical handling and the osteointegration of these systems were assessed by an in vivo study in a rabbit model of bone tunnel healing. This first approach led to the discovery of a new approach to grow physical hydrogel films by a self-sustained process, consisting in using the solvent depletion created at the surface of a swelling polymer substrate immersed in a PVA solution to induce the gelation of hydrogel films without external action. In this process, the growth of these hydrogel films depends on the solution concentration, the soaking time and the swelling kinetics of the substrate. We verified the gentle character of this process by encapsulating fibroblasts, which remain viable for 48h. In a second more “energetic” process, dense coatings of submicronic HA particles were produced on PVA hydrogel by cold spray. Spraying parameters (temperature, pressure and stand-off distance) were varied systematically to determine efficient spraying condition. Based on microscopic observations, a picture explaining the formation of the coating is proposed. Both processes and their combination open new routes for the design of ceramic-hydrogel systems having controlled microstructural, mechanical and biological properties
Lopez, Heredia Marco Antonio. "Bioactivité d'implants en titane poreux produits par prototypage rapide". Nantes, 2008. http://archive.bu.univ-nantes.fr/pollux/show.action?id=666e1d4d-775d-4f85-a273-157a7d47e72d.
Testo completoThe actual efforts concerning the implants for orthopedic and dental applications are focused towards the fabrication of porous bioactif implants. We have developed a fabrication procedure to obtain titanium implants with a controlled porous structure and geometry by using rapid prototyping. Computer tools allow the design of the implants. The work presented in this thesis describes the fabrication of these implants by using a rapid prototyping method and the lostwax process. We have characterized the physicochemical, mechanical and biological properties of the porous titanium implants. The biofunctionality of these implants was specifically shown in critical size bone defects in rabbits. The porous structure allows bone growth towards the center of the titanium implants. We have also studied two surface treatments methods in order to improve the bioactivity of titanium. The first approach is an electrodeposition method to obtain a calcium phosphate coating on the porous titanium implants. The different parameters involved in this procedure (temperature, current, electrodeposition time) have been studied in relationship with the homogeneity, composition and thickness of the calcium phosphate coatings. The effect of radio frequency plasma treatments under different atmospheres and an alkali treatment have been studied in relationship with the ability of the surfaces to induce calcium phosphate precipitation from physiological solutions. Finally we stepped into the bone tissue engineering field by culturing rat mesenchymals stem cells on the porous titanium matrices with or without a carbonate apatite coating
Margossian, Patrice. "Mise en fonction immédiate implantaire chez l'édenté partiel postérieur mandibulaire : étude clinique prospective". Montpellier 1, 2009. http://www.theses.fr/2009MON12201.
Testo completoRibeiro, Fernanda Vieira. "Avaliação da regeneração ossea em defeitos peri-implantares de deiscencia tratados com uma abordagem combinada associando celulas derivadas da medula ossea e regeneração ossea guiada : estudo histomorfometrico em cães". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287911.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo deste estudo foi avaliar histometricamente o reparo ósseo em defeitos periimplantares do tipo deiscência, criados cirurgicamente em cães, tratados com a associação de células derivadas da medula óssea (CMs) e regeneração óssea guiada (ROG). A medula óssea foi obtida a partir da crista ilíaca de oito cães beagle adultos machos. Células derivadas da medula óssea (CMs) foram isoladas, cultivadas in vitro e fenotipicamente caracterizadas com relação as suas propriedades osteogênicas. Os mesmos animais foram submetidos à extração bilateral dos primeiros molares e terceiro e quarto pré-molares inferiores. Após três meses, três leitos para a colocação de implantes foram confeccionados em cada lado da mandíbula, deiscências ósseas vestibulares foram criadas e, então, implantes de titânio de superfície usinada foram colocados. As deiscências ósseas foram tratadas aleatoriamente, de acordo com um dos seguintes grupos: 1) ROG+CMs+C: membrana de PTFE-e com reforço de titânio associada às células derivadas da medula óssea semeadas no carreador, 2) ROG+C: membrana de PTFE-e com reforço de titânio associada ao uso do carreador sem células, 3) CMs+C: células derivadas da medula semeadas no carreador, 4) ROG: membrana de PTFE-e com reforço de titânio, 5) C: carreador sem células e 6) Controle: nenhum tratamento. Após três meses, os animais foram sacrificados e os implantes em conjunto com os tecidos adjacentes foram processados laboratorialmente para obtenção de secções não descalcificadas. Os parâmetros avaliados foram: Contato direto osso-implante (CO), Preenchimento ósseo dentro das roscas do implante (PR) e Área de tecido ósseo fora das roscas (AF). In vitro, a caracterização fenotípica demonstrou que células derivadas da medula óssea apresentaram potencial osteogênico identificado pela formação de nódulos minerais e expressão de marcadores ósseos (fosfatase alcalina, sialoproteína óssea e colágeno tipo I). As análises histométricas revelaram que todos os defeitos tratados com membrana (ROG+CMs+C, ROG+C e ROG) demonstraram resultados estatisticamente similares (p>0,05) com relação à área de novo osso formado fora das roscas do implante, apresentando, no entanto, maior quantidade de osso neoformado fora dos limites das roscas, quando comparados aos demais grupos (CMs+C, C e Controle) (p<0,05). Adicionalmente, foi observado que o preenchimento ósseo dentro das roscas foi estatisticamente semelhante entre os grupos que utilizaram membrana (ROG+CMs+C, ROG+C, ROG) e o grupo tratado com células sem barreira (CMs+C) (p>0,05), enquanto todos estes grupos mostraram um preenchimento ósseo significativamente superior ao grupo Controle (p<0,05). Com relação à porcentagem de contato osso-implante, embora os defeitos tratados com membrana (ROG+CMs+C, ROG+C e ROG) tenham apresentado valores estatisticamente maiores quando comparados aos defeitos dos grupos C e Controle (p<0,05), uma tendência para aumento da extensão de contato osso-implante foi observada nos defeitos tratados com células sem a associação da ROG (grupo CMs+C). Dentro dos limites do presente estudo, pôde-se concluir que embora as células derivadas da medula óssea, utilizadas isoladamente, tenham promovido bons resultados em relação à formação óssea dentro das roscas do implante, o seu uso, associado à ROG, não promoveu benefícios adicionais na formação óssea em defeitos peri-implantares de deiscência.
Abstract: The purpose of this investigation was to histometrically evaluate the bone healing in surgically created dehiscence-type defects around titanium implants treated with an association of bone marrow-derived cells (BMCs) and guided bone regeneration (GBR). Bone marrow cells were harvested from eight male adult beagle dogs, cultured in vitro and phenotypically characterized with regard to their osteogenic properties. Following, the same animals were subjected to bilaterally teeth extraction (lower premolars and the first molar) and three months later, three implant sites were drilled in each side of mandible, buccal bone dehiscences were created and titanium dental implants with machined surface were placed. Dehiscences were randomly assigned to one of the following groups: 1) GBR+BMCs+C: PTFE-e barrier placement associated with BMCs into the carrier, 2) GBR+C: PTFE-e barrier placement associated with carrier, 3) GBR: PTFE-e barrier placement, 4) BMCs+C: BMCs into the carrier, 5) C: carrier without cells e 6) Control: no treatment. After 3 months, the animals were sacrificed and the implants in conjunction with adjacent hard tissues were processed for undecalcified sections. Bone-to-implant contact (BIC), bone filling within the limits of implant threads (BF) and new bone area (BA) in a zone lateral to the implant surface were obtained. Results: In vitro, phenotypic characterization demonstrated that BMCs presented osteogenic potential identified by the mineral nodule formation and the expression of bone markers. Histometrically, inter-group analysis demonstrated that all defects treated with GBR (GBR+BMCs+C, GBR+C and GBR) were statistically similar in terms of BA (p>0.05), presenting significantly higher BA as compared with other groups (BMCs+C, C and Control) (p<0.05). With respect the BF, no differences were observed among GBR+BMCs+C, GBR+C, GBR and BMCs+C groups (p>0.05), whereas all these groups showed statistically superior BF as compared to Control group (p<0.05). Additionally, although the percentage of BIC has been significantly higher in the defects treated by barrier membrane (GBR+BMCs+C, GBR+C and GBR) as compared to C and Control groups (p<0.05), a trend towards to a greater extension of BIC has been observed for the defects treated with BMCs+C. Within the limits of this study, it was concluded that although the use of bone marrowderived cells has provided promising outcomes in terms of bone formation within the limits of implant threads, their use, in combination with GBR, has not promoted additional benefits on the bone regeneration in peri-implantar dehiscence type bone defects.
Doutorado
Periodontia
Doutor em Clínica Odontológica
Leprêtre, Stéphane. "Fonctionnalisation d'hydroxyapatite poreuse pour la délivrance prolongée d'antibiotiques". Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10165.
Testo completoBone presents a complex structure, a delicate balance between the constituent cells. The many well-identified and documented diseases that can affect it remain difficult to treat. The removal of the bony parts affected by cancer or osteomyelitis, generally leads to the use of substitute materials. The consequences of such a surgical act can be infection, or the recurrence of the lesion development. The goal of our work was to treat a porous substrate of hydroxyapatite (HA), which has a similar constitution as bone, in order to improve the propenies of controlled release of antibiotics and to obtain an "activated" bone substitute that is efficient against postoperative infections. The phenomenon of controlled release was obtained by the incorporation and fixation of cyclodextrin in the porous structure of the HA and by cross-linking it with a polycarboxylic acid. Once the process and functionalization parameters established, in vitro studies were conducted to verify the biocompatibility of the system. Finally, we could measure an increase of ciprofloxacin and vancomycin adsorption capacity of the treated HA, followed by a in vitro release kinetics prolonged in time
Lima, Liana Linhares. "Efeito da aplicação intermitente do PTH (1-34) sobre o tecido osseo ao redor de implantes inseridos em ratas expostas ou não a fumaça de cigarro". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287910.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo do presente estudo foi avaliar histometricamente a influência do PTH (1-34) sobre o reparo ósseo e osseointegração de implantes de titânio instalados em tíbias de ratas expostas ou não à inalação da fumaça de cigarro. Foram utilizadas 61 ratas Wistar adultas aleatoriamente divididas em: grupo 1 (n=15) : animais que receberam a aplicação do veículo necessário para a dissolução do hormônio após a instalação do implante; grupo 2 (n=16) : inalação de fumaça de cigarro (IFC) por 60 dias no pré e pós-operatório da colocação do implante; grupo 3 (n = 17): tratamento do grupo 2 associado à injeções subcutâneas de 40 fxg/kg de PTH sintético (1-34) três vezes por semana, após a colocação do implante e grupo 4 (n=13) : injeções subcutâneas de 40 Hg/kg de PTH sintético (1-34) três vezes por semana após a instalação dos implantes. Os animais foram sacrificados sessenta dias após a colocação dos implantes, secções não descalcificadas foram obtidas e avaliadas histometricamente, segundo os seguintes parâmetros: porcentagem de tecido ósseo em contato direto com a superfície do implante (CD), porcentagem de preenchimento ósseo das roscas do implante (AO) e porcentagem de tecido mineralizado numa zona de 500 um, adjacente à superfície do implante (PTM). Os parâmetros foram obtidos separadamente para região cortical e região medular. Não foram detectadas diferenças entre os grupos que receberam aplicação de PTH (1-34) (Grupos 3 e 4) em todos os parâmetros avaliados (p>0,05). Além disso, o PTH promoveu um aumento significativo no CD, AO e PTM em ambas as regiões, mesmo na presença de IFC (p<0.05) (exceto para AO na região cortical). Uma influência negativa da IFC foi observada para o parâmetro CD na região cortical, uma vez que o grupo 2 apresentou os menores valores de CD, seguidos do grupo 1. Resultados semelhantes foram observados para PTM em ambas as regiões analisadas. Dentro dos limites deste estudo pode-se concluir que a aplicação intermitente de PTH (1-34) é capaz de minimizar os impactos negativos da inalação da fumaça de cigarro na osseointegração de implantes de titânio inseridos em tíbias de ratas.
Abstract: The aim of this study was to investigate the synthetic parathyroid hormone, PTH (1-34), can mitigate the effect of cigarette smoke inhalation (CSI) on the bone healing around titanium implants inserted in rats. 61 female Wistar rats were randomly assigned to one of four groups: group l(n = 15): animals that received the application of the necessary vehicle for the dissolution of the hormone after installation of the implant; group 2 (n = 16): cigarette smoke inhalation (CSI) for 60 days preoperatively and sixty days after implant placement group 3(n = 17), treatment group 2, associated with subcutaneous injections of 40 u-g / kg of synthetic PTH (1-34) three times a week after implant placement and group 4 (n = 13): subcutaneous injections of 40 ug / kg of synthetic PTH (1-34) three times a week after placement of implants. The animals were sacrificed sixty days after the placement of implants, not decalcified sections were obtained and evaluated histometrically, according to the following parameters: percentage of bone tissue in direct contact with the implant surface (BIC), percentage of bone filling the threads of the implant (BF) and percentage of mineralized tissue in an area of 500 urn adjacent to the implant surface (BA). The parameters were obtained separately for the cortical and cancellous bone. No differences were found between the groups that received PTH (1-34) (Groups 3 and 4) in all evaluations (p> 0.05). In addition, PTH (1-34) caused a significant increase in BIC, BF and BA in both regions, even in the presence of CSI (p <0.05) (except for BF in the cortical region). A negative influence of the IFC was observed for the parameter BIC in the cortical region, as group 2 had the lowest values of BIC, followed by group 1. Similar results were observed for BA in both regions analyzed. Within the limits of this study can conclude that the intermittent application of PTH (1-34) is able to reversing the negative effects of cigarette smoke inhalation on osseointegration of titanium implants inserted in rats.
Doutorado
Periodontia
Doutor em Clínica Odontológica
Olate, Morales Sergio Adrian. "Analise histologica e histomorfometrica do reparo osseo perimplantar em cães submetidos a instalação de implantes endosseos com um modelo de carga precoce em dois diferentes desenhos de implantes". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289423.
Testo completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Diferentes protocolos para a reabilitação com prótese implanto assistida têm sido reportados. Deles, é possível que a carga imediata em implantes unitários sejam um dos mais controversos. O objetivo deste estudo foi estabelecer quantitativamente as características de reparo ósseo em implantes submetidos a um modelo de carga precoce. Foi desenvolvido um modelo experimental em cães para a avaliação de dois protocolos de instalação de implantes dentais com dois desenhos diferentes. Foi realizada a exodontia dos pré-molares bilaterais mandibulares dos animais e após de três meses foi realizada a instalação de dois implantes bilateriais. No implante mesial foi realizada a instalação do parafuso cicatrizador de 7 mm (modelo de carga imediata unitária sem contato oclusal) e no implante distal foi instalado o parafuso cobertor (técnica de implante submerso). Cada hemimandíbula recebeu um implante cilíndrico (Neodent Titamax CM®) e um implante cônico (Conexão Conect Ar®) com seu parafuso cicatrizador. Inicialmente os primariamente foram avaliados com microscopia eletrônica de varredura. Os sacrifícios dos animais foram após de três e seis semanas. Os blocos foram descalcificados e processados para análise com histológica descritiva e histomorfométrica. Foi aplicado o teste estatístico t teste para variáveis independentes com nível de significância de 5%. De forma geral, os implantes apresentaram maior formação óssea no nível cervical e menor no nível apical. Os resultados demonstram também maior formação óssea em implantes com o modelo de carga precoce que em aqueles sem carga, com ausência de diferença estatística. Por outra parte, os implantes cônicos apresentaram maior formação óssea que os cilíndricos, também sem significância estatística. Concluiu-se que os implantes com instalação do parafuso cicatrizador, como modelo de restauração imediata sem contato oclusal, apresenta maior quantidade óssea nos vales quando comparados aos implantes não submetidos a carga
Abstract: Several treatment types using prosthesis over implants have been reported, being the singles immediate loading therapy with more controversy. The meaning of the present study is established the characteristics of bone repair in dental implant submitted to immediate loading. It was performed a experimental model using dogs to value two different installations protocols of dental implants. It was done the extraction of the bilateral premolars of the jaw, installing the dental implants after 3 months of healing. The anterior implant was submitted to healing screw install of 7 mm (unitary immediate load model without oclusal contact) and the posterior ones were covered with cove screrw (immerse implant technique). Each hemi-jaw presented one cylindrical (Neodent Titamax CM®) or conical (Conexão Conect Ar®) with with anterior or posterior position, that was evaluated with scanning electron microscopy. The sacrifices were performed on three and six months. The specimens were decalcified and processed to begging its histological evaluation using descriptive and histomorphometric analyses. The statistical test T test was performed using significance index of 5%. In general, dental implants showed more bone formation on cervical region and less on apical area. The results demonstrated more bone formation on the immediate loading types, with no statistical significance. The conical ones presented more bone formation that cylindrical, but without statistical significance. This way it is possible to conclude that implants with immediate installation of healing screw, how immediately load model without oclusal contact (immediately restauration), have more osseous presence when compared to non load implant
Mestrado
Cirurgia e Traumatologia Buco-Maxilo-Faciais
Mestre em Clínica Odontológica
Hurteaux, Reynald. "Activités biologiques d'un peptide et mise au point d'un système de libération prolongée par microcapsulation en vue de la foctionnalisation de biomatériaux". Reims, 2003. http://www.theses.fr/2003REIMO201.
Testo completo@The first part of this work was to study the effects of an activator of the TGF-beta. This peptide named KRFK, conserved its activator properties of the TGF-beta in the osteoblast. The second part of this work was to prepare and characterise a sustained release system, and then associate it to a prosthetic coating. This sustained release is called microcapsules. Their characterization allowed us to demonstrate their perfect biocompatibility and to obtain a sustained release of the peptide. Moreover, we created an alginate film in order to associate the release system to a CaP coating. Thus, we obtain a new biomaterial for bone implantation which is able to release an active peptide. This will lead to improve the bone regeneration
MARIE-JULIE, VINCENT MICHELE. "Etude comparative anatomique, radiographique et scanographique de la resorption mandibulaire : interets en implantologie". Nice, 1990. http://www.theses.fr/1990NICE7509.
Testo completoLopes, Fernanda Ferreira. "Avaliação clinica da regeneração ossea guiada associada ou não ao enxerto osseo no tratamento de defeitos osseos resultantes da peri-implantite induzida por ligaduras em cães". [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289023.
Testo completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo deste estudo foi avaliar, clinicamente, o preenchimento de defeitos ósseos ao redor de implantes após a utilização da regeneração óssea guiada (ROG), isolada ou em combinação com enxerto ósseo (E O) mineralizado, no tratamento da peri-implantite induzida por ligaduras em cães. Uma amostra de cinco cães foi selecionada, onde os segundos, terceiros e quartos pré-molares inferiores (P2, P3 e P4) bilaterais foram extraídos. Três meses após a extração dos dentes, dois implantes de titânio foram colocados bilateralmente em cada cão. Os intermediários foram conectados três meses após a colocação dos implantes e induzido o processo de peri-implantite através de ligaduras ao redor dos implantes. As ligaduras e os intermediários foram removidos após um mês e quatro diferentes modalidades de tratamento foram propostas: descontaminação, descontaminação associada a regeneração óssea guiada, descontaminação associada a enxerto ósseo mineralizado e descontaminação associada a regeneração óssea guiada e enxerto ósseo mineralizado. Os níveis de inserção relativos ao redor dos implantes foram obtidos no momento do tratamento (pré-tratamento) e 5 meses após o tratamento (pós-tratamento) da peri-implantite, com o auxílio de um guia de sondagem, fio de aço e paquímetro digital. Estatisticamente, não houve diferença em relação ao preenchimento do defeito ósseo, entre as modalidades de tratamento propostas (p=0,3779). Logo dentro dos limites do presente estudo, as quatro modalidades de tratamento avaliadas mostraram resultados semelhantes, embora maior preenchimento do defeito tenha sido observado clinicamente quando a descontam inação estava associada à técnica de ROG mais enxerto ósseo, seguido por ROG e enxerto ósseo isolados
Abstract: The objective of the present study was to evaluate, clinically, hard tissue fill following treatment of ligature-induced peri-implantitis defects in dogs with guided bone regeneration and/or bone grafts. Five dogs were used. The mandibular premolars were bilaterally removed. After 3 months of healing, two titanium implants were placed on each si de of the mandible. Following abutment connection, 3 months later, experimental peri-implantitis was induced by the placement of cotton ligatures in a submarginal position. Ligatures and abutments were removed after one month and the bony defects were randomly assigned to one of the following treatments: debridement, debridement plus guided bone regeneration, debridement. plus mineralized bone graft and debridement plus guided bone regeneration associated with mineralized bone graft. The peri-implant bone defects were clinically measured before and 5 month post-treatments. No statistically significant differences in hard tissue fill were found between the defects treated by any of the procedures (p=0,3779). Within the limits of this study, it can be concluded that ali tested treatments provided similar results in bone defect fill. However, a trend to improved gains was observed when the debridement procedure was supplemented, sequentially, by bone graft, guided bone regeneration and a combination of both
Mestrado
Periodontia
Mestre em Clínica Odontológica
Oliveira, Greison Rabelo de. "Avaliação clinica e radiografia da neoformação ossea em levantamento do assoalho do seio maxilar utilizando apenas coagulo sanguineo". [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289426.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A instalação de implantes na região posterior da maxila várias vezes é confrontada com processos alveolares reabsorvidos, resultantes de uma combinação da pneumatização do seio maxilar, dos efeitos da doença periodontal, e do processo de reabsorção óssea fisiológica resultante da falta de estímulo funcional que sucede as exodontias. O levantamento do assoalho do seio maxilar vem sendo praticado desde 1980 com o objetivo de aumentar a altura óssea nessa região, promovendo condições para uma reabilitação protética suportada por implantes. Recentemente alguns trabalhos relataram resultados favoráveis utilizando o coágulo sangüíneo no preenchimento do seio maxilar. Dessa forma, avaliamos através de uma análise clínica e radiográfica, a neoformação óssea no interior do seio maxilar após o levantamento do assoalho e preenchimento da cavidade apenas com coágulo sangüíneo local. Para isto foram selecionados 10 pacientes com edentulismo na região posterior da maxila, representando assim 10 seios maxilares. Após um período médio de 11,9 meses depois do levantamento do assoalho, apenas 3 seios maxilares apresentaram neoformação óssea que permitiu a instalação dos implantes. Contrariamente aos resultados favoráveis da análise radiográfica sugestivos de neoformação óssea, clinicamente observamos que a utilização do coágulo no levantamento do assoalho do seio maxilar não se mostrou efetiva neste estudo
Abstract: Implant placement in the posterior maxilla is frequently challenged by resorbed alveolar processes due to a combination of maxillary sinus pneumatization, the effects of periodontal disease and the physiological bone resorption following tooth extractions. The sinus floor augmentation surgery has been performed since 1980 with the purpose of increasing bone height in this region, allowing implant-supported prosthetic rehabilitation. Recently, a few studies have presented favorable results using blood clot for maxillary sinus filling. Therefore, we evaluated through clinical and radiographic analysis the neoformation of bone inside the maxillary sinus after sinus lifting and the filling of the cavity with local blood clot alone. Ten patients with posterior maxillary edentulism were selected, representing 10 maxillary sinuses. Following a mean period of 11.9 months after sinus floor augmentation, only 3 sinuses presented bone neoformation that allowed implant placement. Conversely to the favorable results observed in the radiographic analysis, the use of blood clot for sinus floor augmentation was not clinically effective in the present study
Doutorado
Cirurgia e Traumatologia Buco-Maxilo-Faciais
Doutor em Clínica Odontológica
Bastos, Eider Guimarães. "Analise quimica, microestrutural e da interface implante : pilar intermediario de quatro sistemas de implantes dentarios endo-osseos". [s.n.], 2001. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289438.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo deste trabalho foi avaliar a composição química, metalográficas, a topografia superficial e a interface de adaptação implante pilar intermediário por meio de microscopia óptica, microscopia eletrônica de varredura e espectroscopia de energia dispersiva de quatro sistemas de implantes dentários endoósseos disponíveis no Brasil: Implamed@, Master Screw@, Titanium Fix@ e INP@, divididos em grupos 1, 2, 3 e 4. Os resultados obtidos com a análise química mostraram que todos os grupos apresentaram uma estrutura de titânio comercialmente puro de grau 1. A análise metalográfica mostrou que os quatro grupos apresentaram uma estrutura de fase a+ 13, com o grupo 1 apresentando menor tamanho de grãos. Os resultados obtidos com a microscopia eletrônica de varredura mostraram melhor acabamento nos grupos 1 e 2, com os grupos 3 e 4 mostrando roscas mais afiladas e irregulares, respectivamente. A análise por meio da microscopia eletrônica de varredura e espectroscopia de energia dispersiva mostrou a presença de contaminantes de superfície em todas as amostras. A análise da interface implante-pilar intermediário variou de acordo com o forma geral todos os grupos analisados apresentaram bons resultados, valendo sistema de implante, mas de uma forma geral todos os grupos apresentaram uma boa adaptação entre os componentes. Podemos concluir que de uma ressaltar o bom desempenho dos grupos 1 e 2 nos quesitos de avaliação metalográfica para o tamanho de grãos e acabamento na região das roscas
Abstract: The purpose of this study was to evaluate the chemical composition, metallography, the surface topographies and the abutment-implant interface by means of optic microscopy and scanning electron microscopy with energy dispersive spectroscopy of four dental implant systems available in Brazil: Implamed@, Master Screw@, Titanium Fix@ e INP@, divided in groups 1, 2, 3 e 4. The results obteined by chemical analysis showed that all groups had one typical structure of commercially pure titanium degree 1. The metallography analysis showed the four groups with structutre of a+ phase, and the group 1 with smaller grains. The results obtained by scanning electron microscopy showed better finish of the groups 1 and 2, with the groups 3 and 4 showing spirals more fine and irregulars, respective. The analysis by scanning electron microscopy with energy dispersive spectroscopy showed contaminants of the surface on all samples. The evaluation of the abutment implant interface varied according to the implant, but all the groups showed good adaptation. We conclude that all the groups showed good results, emphasizing the good performance of the groups 1 and 2 in the metallography analysis to grain size and finish of the spirals
Doutorado
Cirurgia
Doutor em Clínica Odontológica
Gurgel, Bruno Cesar de Vasconcelos. "Efeito do plasma rico em plaquetas na regeneração ossea guiada de defeitos osseos peri-implantares : estudo histometrico em cães". [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287906.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo do presente estudo foi avaliar histometricamente o reparo ósseo obtido após a utilização do plasmarico em plaquetas (PRP) e/ou de membranas não reabsorvíveis no tratamentode defeitos ósseos peri-implantares, do tipo deiscência, criados cirurgicamente em cães. Foram utilizados 1O cães adultos, machos, sem raça definida, nos quais os pré-molares inferiores (P2,P3, P4)e o primeiro molar foram extraídos. Após 3 meses das extrações, os leitosparaos implantes foram criados e posteriormente 2 deiscências ósseas vestibulares bilaterais, sendo então inseridos 4 implantes dentais de titânio. As deiscências foram designadas aleatoriamente às seguintes modalidades terapêuticas: 1) controle; 2) ROG; 3)PRP;4) PRP + ROG. Após 3 meses do tratamento, os animais foram sacrificados e os blocos contendo os implantes e tecidos duros adjacentes processados para secções não descalcificadas. Na análise histométrica, os parâmetros avaliados foram o contato osso-implante, a área de preenchimento ósseo dentro das roscas, a área e a densidade de tecido ósseo formado na região fora das roscas. Análise deVariância foi utilizada para a análise estatística dos dados (p
Abstract: The aim of the present study was to evaluate, histometrically, the bone healing after utilizing the platelet-rich plasma (PRP) and/ornon-resorbable membranes on the treatment of peri-implant bone defects, deiscense type, surgically created in dogs. Ten mongrel male adult dogswere used; in which the threel ow premolars (P2,P3,P4) and the first molar were extracted. Three months after dental extraction, dental implants sites were created and lately two bilater albuccal bone dehiscence, in which four titanium dental implants were inserted. Dehiscences werer and omly assignedfor the following treatment: 1) contrai; 2) GBR;3) PRP; 4) PRP+ GBR. After 3 months, animais were sacrificed; dental implants and adjacent hard tissues were pracessed for undecalcified sections. At histometrical analysis,the parameter se valuated were bone-implant contact, bone filling area into threads, bone tissue area and bone density formed out the threads. Variance Analysis was utilized for statistical analysis of the data (p
Doutorado
Periodontia
Doutor em Clínica Odontológica
Pereira-Stabile, Cecilia Luiz. "Influencia da radiação laser de baixa intensidade sobre o reparo osseo ao redor de implantes de titanio instalados sobre areas tratadas ou não com um substituto osseo : analise histometrica em coelhos". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288779.
Testo completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Este estudo teve como objetivo avaliar histometricamente a influência do uso de um laser de baixa intensidade e de um cimento de fosfato de cálcio sobre o reparo ósseo ao redor de implantes de titânio instalados em tíbias de coelhos. Para tanto, foram utilizados 12 coelhos adultos nos quais foram preparados dois defeitos de diâmetro 3,7 mm em cada tíbia. Os defeitos distais foram preenchidos com o cimento de fosfato de cálcio BoneSource1 e os defeitos proximais não receberam tratamento. Todos os defeitos foram cobertos por membranas de colágeno absorvível ProTape2. Após 6 semanas, as áreas de todos os defeitos receberam implantes de titânio. Os implantes colocados nas tíbias direitas foram então submetidos a aplicações de laser de baixa intensidade, de meio ativo GaAlAs, a cada 48h do 1.º ao 13.º dia pós-operatórios, totalizando 7 sessões, enquanto que as tíbias esquerdas não receberam aplicações de laser. Após 3 e 6 semanas, foram feitos os sacrifícios (6 animais por período), e cortes não-descalcificados foram obtidos e analisados com relação ao contato direto entre osso e implante (CO) e à área de osso no interior das roscas (AO). Os resultados obtidos foram tabulados e analisados estatisticamente usando ANOVA e teste de Tukey. Para o CO apresentou um aumento significante nos grupos laser, comparado com os grupos sem laser, nos tempos de 3 e 6 semanas (p<0,003). As médias de CO foram estatisticamente semelhantes entre os grupos com e sem material, nos tempos de 3 e 6 semanas. O CO não apresentou aumento estatisticamente significante com o tempo, comparando-se os grupos de 3 e 6 semanas. Considerando-se AO, as médias foram estatisticamente semelhantes entre os grupos com e sem material e com e sem laser, nos tempos de 3 e 6 semanas. A AO apresentou aumento estatisticamente significante com o tempo, comparando-se os grupos de 3 e 6 semanas, independentemente do uso de laser e material (p<0,0001). Não houve interação significativa entre os fatores material e laser para ambos CO e AO. Baseado nos resultados obtidos, e dentro das limitações deste estudo, conclui-se que: (1) o laser de baixa intensidade melhorou o contato osso-implante em tíbias de coelho; (2) o material aloplástico testado proporcionou reparo ósseo ao redor dos implantes semelhante ao obtido com o coágulo
Abstract: This study aimed to evaluate histometrically the influence of a calcium phosphate cement and a low intensity laser on bone repair around titanium implants placed in rabbit tibiae. Twelve adult rabbits were used, and two bone defects of 3.7 mm diameter were prepared in each tibia. The two distal defects were filled with BoneSource1 calcium phosphate cement and the proximal defects did not receive any material. All defects were covered with ProTape2 collagen membranes. After six weeks, the areas of all defects received titanium implants. The implants placed in the right tibiae were subjected to low intensity laser therapy (LILT) with a GaAlAs diode laser every 48h from the 1st to the 13th day postoperatively. After 3 or 6 weeks, the animals were sacrificed (6 animals per period), non-decalcified sections were obtained and analyzed for bone-to-implant contact (CO) and bone area within the implant threads (AO). The results were tabulated and analyzed statistically using ANOVA and Tukey¿s test. For CO, the means were statistically similar between groups with and without the material, in the periods of 3 and 6 weeks. CO presented significant increase in the laser irradiated groups, when compared with non-treated groups, in both 3 and 6 weeks periods (p<0.003). CO did not increase significantly with time, when 3 and 6 weeks periods were compared. Considering AO, the means were statistically similar among groups with and without material and with and without laser, in both 3 and 6 weeks periods. The AO presented significant increase with time, when comparing 3 and 6 weeks groups, regardless the use of laser or material (p<0.0001). There was no significant interaction between material and laser for both CO and AO. Based on the results, and considering the limitations of the study, it can be concluded that: (1) low intensity laser improved bone-to-implant contact in rabbit tibiae; (2) the alloplastic material promoted similar peri-implant bone repair when compared to blood cloth
Mestrado
Cirurgia e Traumatologia Buco-Maxilo-Faciais
Mestre em Clínica Odontológica
Santos, Alex Eugênio dos [UNESP]. "Desenvolvimento de parafuso de interferência bioabsorvível para cirurgia de joelho em PLDL (poli ácido lático) e compósito PLDL + βTCP (beta trifosfato de cálcio)". Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/124038.
Testo completoO parafuso de interferência é o dispositivo de fixação mais usados em cirurgias de reconstrução ligamentar de joelho. O uso dos polímeros bioabsorvíveis está sendo cada vez mais utilizados nesta aplicação, devido suas vantagens relacionadas à excelente biocompatibilidade, bioabsorção, integração do enxerto/osso e também facilidade na revisão cirúrgica. O presente estudo tem por objetivo tem por objetivo o desenvolvimento de um parafuso de interferência bioabsorvível fabricado através do processo de injeção em dois polímeros bioabsorvíveis: PLDL (Poli L-D-ácido lático) e um compósito de PLDL+30% TCP (β Trifosfato de Cálcio). Para o desenvolvimento do projeto do produto foi usado um programa de análise estrutural por elementos finitos, de forma a obter a melhor geometria do encaixe de ferramenta. Através dos estudos de simulação por elementos finitos foi possível selecionar a geometria com maior resistência mecânica levando em conta o esforço de torção e além disso foi possível analisar a influência de furos transversais nas tensões mecânicas geradas pelos esforços de torção. Após a definição da melhor geometria, foram fabricadas amostras dos parafusos com os dois polímeros selecionados, os quais foram esterilizados por ETO (Óxido de etileno). Foram realizados testes mecânicos de torque inserção e torque de ruptura. A resistência mecânica do parafuso foi avaliada através da comparação entre os valores do torque de inserção comparando-se com o torque máximo de ruptura. Para contribuir o estudo foi executado teste de degradação in vitro, durante um período de 180 dias, onde foi avaliada a perda de massa dos implantes, resistência mecânica e queda do peso molecular dos implantes. Logo foi possível avaliar o compartamento mecânico dos implantes em degradação comparando-os com os requerimentos da aplicação. Pode-se observar que a degradação molecular do implante ao longo dos...
The interference screw is the fixation device most selected for Knee ligament reconstruction surgeries. The use of Bioabsorbable polymers in interference screws for this application is increasing due it has advantages like excellent biocompatibility, bioabsorption, good integration between graft / bone and also facility in the surgical revision. The aims of the present study were to develop a bioabsorbable interference screw manufactured by the injection moulding process with two distinct polymeric materials: PLDL, Poly(L,DL-Latic acid) and a composite PLDL + 30% TCP (β Tricalcium phosphate). A program for structural analysis by finite elements was used in the development of the screw design, in the intend to make the best geometry fit for the tool. Trough the study by finite elements simulation it was possible to chose the geometry with higher mechanical resistance taking in the account the torsion effort and analyse the influence of transversals holes in the mechanical tensions made by the torque efforts. After the definition of the best geometry, samples of the screw were manufactured with the two selected polymers, sterilized with ETO (ethylene oxide). Were performed mechanical tests, insertion test and torque to break. The mechanical strenght of the screw was evaluated through the comparison between the values of insertion torque and maximum rupture. In addition, a in vitro, degradation test was performed over a period of 180 year days. It was observed, the weight loss, mechanical strength of the implants was evaluated, and molecular weight drops of the implants. Therefore it was possible to evaluate the mechanical behavior in degradation and compare with the application requirements. It can be observed that the raise of the molecular degradation of the implant along the months had as result a loss of the mechanical resistance of the screw, ina slowly and gradual way for the PLDL material, yet the composite material (PLDL+TCP)...
Bolle, Caroline. "Influence de la conception implantaire sur l'adaptation tissulaire marginale précoce : une étude histologique chez le Beagle". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10117/document.
Testo completoAesthetic and functional long-term success of implant-supported rehabilitations relies on the preservation of peri-implant tissue levels in the most coronal position. Therefore, the achievement of an efficient protective mucosal seal, and the preservation of the peri-implant marginal bone during the first weeks of healing are essential to prevent long term implant failures. The characteristics of an implant transmucosal design (connections, platforms, surface properties) are related to biological width dimensions, marginal peri-implant bone levels, and the amount of inflammation within the peri-implant soft tissues. The aim of the research work presented in this manuscript was to investigate the effect of two innovative implant systems on peri-implant mucosa maturation, dimensions, collagen fiber organization, and marginal bone levels after 3 and 12 weeks of healing in the beagle dog. The results, compared with previous data, show that platform-switched twopiece implants exhibit reduced values of biological width and marginal bone loss, and that a concave transmucosal design in one-piece implants is associated with a short vertical value of biological width, and promote a mechanical interlocking of the implant body at the connective tissue and marginal bone levels. In the first part of this report, an overview of the current knowledge concerning the characteristics and healing patterns of peri-implant tissues, and the influence of implant design on the early peri-implant tissue remodeling is established. We have written two international publications which are presented in the second part. An analytical reflection about this work is presented in the third part
Kluppel, Leandro Eduardo. "Utilização de parafusos absorviveis para fização de enxertos osseos autogenos : estudo histologico em coelhos". [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288687.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo do presente estudo in vivo foi avaliar histologicamente, de forma comparativa, o emprego de parafusos absorvíveis baseados no polímero poli(L-co-D,L ácido lático) 70:30 sintetizado por um laboratório nacional, para fixação de enxertos ósseos autógenos em tíbias de coelhos. Como controle foram utilizados parafusos à base de liga de titânio (Ti-6Al-4V/Grau V) de mesmas dimensões. Para tanto, foram selecionados 15 coelhos adultos, albinos, da raça Nova Zelândia, machos, com idade aproximada de 6 meses e peso variando entre 3,8 e 4,5 kg no momento do procedimento cirúrgico. De cada animal foram removidos 2 enxertos ósseos em espessura total da calota craniana, sendo um deles fixado à tíbia com parafuso absorvível e o outro com parafuso metálico. Os animais foram divididos em 3 grupos, de acordo com os períodos de sacrifício: 3, 8 e 16 semanas pós-operatórias. Após o processamento histológico, as lâminas foram coradas com hematoxilina e eosina e submetidas à análise histológica descritiva em microscopia óptica. Como resultado encontrou-se que o sistema de fixação baseado em polímero apresentou um comportamento histológico bastante semelhante ao sistema metálico. Em ambos os grupos o enxerto encontrava-se incorporado, ocorrendo neoformação óssea em sua interface com o leito receptor. Em nenhum dos grupos foi evidenciado processo inflamatório indesejável ou reação a corpo estranho. Baseando-se nos achados histológicos para o modelo experimental e metodologia empregada, pode-se concluir que o sistema de fixação baseado no polímero poli(L-co-D,L ácido lático) 70:30 é efetivo para a fixação de enxertos ósseos autógenos, com resultados comparáveis ao materiais à base de liga de titânio.
Abstract: The aim of the present in vivo study was to evaluate histologically, by comparative means, the use of resorbable screws based on poli(L-co-D,L lactide) 70:30, manufactured by a brazillian laboratory, used for fixation of autogenous bone grafts in rabbit tibiae. As a control, titanium (Ti-6Al-4V Grade V) screws were used. For this purpose, fifteen white New Zeland male rabbits, with age of 6 months and weight between 3.8 - 4.5 Kg were used. Of each animal, 2 total thickness bone grafts were removed from the cranial vault and one of them was stabilized with resorbable screw while the other was stabilized with the metallic one. Animals were divided in 3 groups, according to the sacrifice period: 3, 8 and 16 week postoperatively. After histological processing, cuts were corated with hematoxilin and eosin and submited to descriptive histological analysis under light microscopy. As a result it was found that the fixation system based on polimer showed a histological behavior similar to the metallic system. For both groups bone graft was incorporated, with the presence of bone neoformation between this and the receptor site. In none of the groups undesirable inflammatory process or foreign body reaction was observed. Based on histological findings and respecting this experimental model it is possible to conclude that that the internal fixation system based on the poli(L-co-D,L lactide) 70:30 polymer is effective for fixation of autogenous bone grafts, offering results that are comparable the titanium fixation systems.
Doutorado
Cirurgia e Traumatologia Buco-Maxilo-Faciais
Doutor em Clínica Odontológica