Increased osseointegration effect of bone morphogenetic protein 2 on dental implants: An in vivo study

Application of recombinant human bone morphogenetic protein 2 (rhBMP-2) to implant surfaces has been of great interest due to its osteoinductive potential. However, the optimal coating methodology has not been clarified. The objective of the study was to determine whether the application of rhBMP-2 onto plasma-sprayed hydroxyapatite implant surfaces by immersion in protein solution before implant installation would result in significantly improved bone apposition. Using a sheep iliac model, titanium (Ti) and plasma-sprayed calcium-phosphate (PSCaP)-coated implants uncoated and coated with rhBMP-2 were assessed for their osteogenic effects in the peri-implant area over time in terms of osseointegration and de novo bone formation. After 3 and 6 weeks postoperatively, the samples were retrieved and were subjected to bone-to-implant contact (BIC) and bone area fraction occupancy (BAFO) evaluation. When rhBMP-2 was applied to the PSCaP surface, significant increases in BIC and BAFO were observed at 3 weeks in vivo, whereas when adsorbed directly onto the titanium implant surface, rhBMP-2 did not as effectively improve the bone response (although significantly higher than control Ti). The outcomes of the present study suggested that the combination of plasma-sprayed calcium-phosphate surface and rhBMP-2 coating significantly enhanced osseointegration, which validated the postulated hypothesis. © 2013 Wiley Periodicals, Inc.

Three-dimensional finite element analysis of stress distribution in retention screws of different crown-implant ratios

The retaining screw of the implant-supported dental prosthesis is the weakest point of the crown/implant system. Furthermore, crown height is another important factor that may increase the lever arm. Therefore, the aim of this study was to assess the stress distribution in implant prosthetic screws with different heights of the clinical crown of the prosthesis using the method of three-dimensional finite element analysis. Three models were created with implants (3.75 mm × 10 mm) and crowns (heights of 10, 12.5 and 15 mm). The results were visualised by means of von Mises stress maps that increased the crown heights. The screw structure exhibited higher levels of stresses in the oblique load. The oblique loading resulted in higher stress concentration when compared with the axial loading. It is concluded that the increase of the crown was damaging to the stress distribution on the screw, mainly in oblique loading. © 2013 Taylor & Francis.

Five-year follow-up of modified implant-supported overdenture in an iliac crest autograft failure: Clinical report

The treatment of extensive pathologic lesions in the jaw, most of the time, can generate rehabilitation problems to the patient. The solid ameloblastoma is a locally invasive odontogenic tumor with a high recurrence rate. Its treatment is aggressive and accomplished through resection with safety margin. The criterion standard for reconstruction is autogenous bone, but it can provide a high degree of resorption, causing inconvenience to the patient because of lack of rehabilitative option. This study aimed to describe a patient with ameloblastoma treated through resection and reconstruction with autogenous bone graft, in which, after an extensive resorption of the graft was made, a modified bar was applied to support a prosthetic implant overdenture. Copyright © 2013 by Mutaz B. Habal, MD.

Tribocorrosion behaviour of anodic treated titanium surfaces intended for dental implants

Tribocorrosion plays an important role in the lifetime of metallic implants. Once implanted, biomaterials are subjected to micro-movements in aggressive biological fluids. Titanium is widely used as an implant material because it spontaneously forms a compact and protective nanometric thick oxide layer, mainly TiO2, in ambient air. That layer provides good corrosion resistance, and very low toxicity, but its low wear resistance is a concern. In this work, an anodizing treatment was performed on commercial pure titanium to form a homogeneous thick oxide surface layer in order to provide bioactivity and improve the biological, chemical and mechanical properties. Anodizing was performed in an electrolyte containing β-glycerophosphate and calcium acetate. The influence of the calcium acetate content on the tribocorrosion behaviour of the anodized material was studied. The concentration of calcium acetate in the electrolyte was found to largely affect the crystallographic structure of the resulting oxide layer. Better tribocorrosion behaviour was noticed on increasing the calcium acetate concentration. © 2013 IOP Publishing Ltd.

Avaliação da influência de diferentes materiais oclusais na confecção de próteses fixas implantossuportadas unitárias com diferentes diâmetros dos implantes osseointegrados: estudo pelo método dos elementos finitos tridimensionais

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação da precisão das técnicas de moldagem para próteses implantossuportadas sobre implantes alinhados e implantes não-alinhados

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Precisão das técnicas de moldagem e vazamento para próteses implantossuportadas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito de dois sistemas de soldagem na alteração dimensional nas ligas de cobalto-cromo verificado por meio de análise por extensometria linear elétrica e resistência à flexão

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência do tipo de fundição e uso de retificação na interface pilar/cilindro protético na adaptação marginal e tensão peri-implantar sobre conexão protética tipo Micro-Unit

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise da distribuição das tensões em restaurações cerâmicas sobre dente natural e implante por meio do método dos elementos finitos

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Cantilever em Próteses: análise da deformação de estruturas metálicas em NiCr, com diferentes configurações, em função da carga aplicada

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Influência de diferentes pilares e materiais de recobrimento estético na manutenção da pré-carga do parafuso de retenção de coroas implantosuportadas

Pós-graduação em Odontologia - FOA

Osseointegração de implantes de titânio com modificação da superfície por ablação a laser e recobrimento por hidroxiapatita biomimética: estudo biomecânico e histomorfométrico em tíbia de coelhos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação do desajuste vertical da interface implante/pilares UCLA com cinta metálica de cinco marcas distintas: análise intra e entre-sistemas

A adaptação passiva entre prótese e implante é fundamental para a longevidade de procedimentos reabilitadores através de implantes odontológicos. Diante disso, este trabalho teve como objetivo avaliar a adaptação na interface UCLA com cinta metálica e implante utilizando-se componentes de um mesmo sistema de implantes e combinações de componentes de diferentes sistemas, através de microscopia eletrônica de varredura. Componentes de 5 empresas foram utilizados: Biomet 3i, Conexão, Neodent, SIN e Titanium fix. Foram realizadas leituras nas interfaces direita e esquerda das várias combinações entre UCLA e implantes, com aumento de 300x. As médias de (des)ajuste vertical foram submetidas a análise estatística pelo teste Student-Newman Keuls, com significância de 5% (p<0,05). Os resultados da análise intra-sistema mostraram desajuste estatisticamente significante para o abutment UCLA SIN com cinta de ouro (desajuste médio 3,88_m) comparando-se com os demais sistemas. Para a análise entre-sistemas, sugere-se que nem todas as combinações podem ser consideradas compatíveis relativamente ao desajuste vertical.

Influência do tipo de pilar de resistência mecânica pré-ciclagem, quantidade de toque retido e desajuste vertical pré e pós-ciclagem, com análise estrutural em MEV

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)