57 resultados para Porcelana


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Clínica - International Journal of Brazilian Dentistry

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

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Pós-graduação em Odontologia Restauradora - ICT

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Pós-graduação em Odontologia Restauradora - ICT

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O tratamento de escolha para a avulsão dentária é o reimplante dentário, no entanto diversos fatores interferem no prognóstico e a reabsorção radicular é a principal seqüela podendo levar a perda dentária. O objetivo do trabalho foi relatar um caso clínico de reimplante dentário com perda dentária por extensa reabsorção radicular e os planos de tratamento instituídos para reposição do dente perdido. Paciente após acidente motociclístico apresentou avulsão dentária e fratura coronária do elemento 21 e subluxação e fratura coronária do 11. Após quatro anos do reimplante o dente foi perdido por reabsorção radicular externa. Um novo plano de tratamento foi instituído e como a paciente apresentava uma maloclusão foi realizado um tratamento ortodôntico e uma cirurgia ortognática seguido da colocação de um implante para reposição do 21. Como não ocorreu a osseointegração do implante após três tentativas foi realizada uma prótese fixa adesiva associada à laminado de porcelana para o restabelecimento da função e a estética. Desta forma a interdisciplinaridade permitiu a elaboração de planos de tratamento, capaz de eliminar os imprevistos e conduzir o caso a um sucesso.

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The development of an accurate diagnosis and appropriate treatment plan can be a complex task, especially in cases of dentoalveolar trauma. The authors present a case report of crown-root fracture caused by trauma and highlight the importance of a multidisciplinary approach for the treatment. An eighteen year-old boy had a bicycle accident resulting in dental trauma. The upper right first molar showed a complicated crownroot fracture and the lower left second pre-molar showed an uncomplicated crown-root fracture. Endodontic treatment, controlled tooth extrusion, periodontal surgery for recovery of biological width, and porcelain crown and onlay restorations were performed. Esthetic and functional results were achieved. At the two-year follow-up it was observed that the tooth/onlay interface of the upper right first molar was stained and the onlay of the left lower second pre-molar was fractured. Therefore, the interface stained was repaired and a porcelain crown was made for the lower second premolar. The clinical case presented herein leads to the conclusion that a multidisciplinary treatment plan is extremely important for a proper resolution in cases of dentoalveolar trauma.

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The demand for esthetic restorations has resulted in an increased use of dental ceramics and is the main alternative restorative material to tooth structure due to its favorable properties. Therefore, the aim of this work is to study the evolution of ceramic systems, involving different types and properties, indications, and clinical issues as aesthetic, cementing and longevity. In a detailed and advanced search in the database PubMed, 98 articles were found using the following key words: dental porcelain dental all-ceramic and ceramic according to the criteria for inclusion and exclusion left only 35 articles for review. Several ceramic systems are available in the market, making the prosthetic professionals need a constant recycling about their properties and directions, since good results are due to the selection of the best material for a particular case in all the skill of the practitioner.

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Objective: the aim of this study was to evaluate the influence of occlusal veneering material in single fixed implant-supported crowns through the 3-D finite element method. Material and methods: Four models were fabricated using the Rhinoceros 4.0, SolidWorks, and InVesalius softwares. Each model represented a block of mandibular bone with an external hexagon implant of 5 mm x 10 mm and different veneering materials including NiCr (1), porcelain (2), composite resin (3), and acrylic resin (4). An axial load of 200 N and an oblique load of 100 N were applied. Results: model (2) with porcelain veneering presented a lower stress concentration for the NiCr framework, followed by the composite resin and acrylic resin. The stress distribution to the implant and bone tissue was similar for all models. Conclusions: there is no difference of stress distribution to the implant and supporting structures by varying the veneering material of a single implant-supported prosthesis.

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Objective: the aim of this study was to evaluate the influence of occlusal veneering material in single fixed implant-supported crowns through the 3-D finite element method. Material and methods: Four models were fabricated using the Rhinoceros 4.0, SolidWorks, and InVesalius softwares. Each model represented a block of mandibular bone with an external hexagon implant of 5 mm x 10 mm and different veneering materials including NiCr (1), porcelain (2), composite resin (3), and acrylic resin (4). An axial load of 200 N and an oblique load of 100 N were applied. Results: model (2) with porcelain veneering presented a lower stress concentration for the NiCr framework, followed by the composite resin and acrylic resin. The stress distribution to the implant and bone tissue was similar for all models. Conclusions: there is no difference of stress distribution to the implant and supporting structures by varying the veneering material of a single implant-supported prosthesis.

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The evolution of techniques and materials applied to adhesive ceramic restorations resulted in the intensification of its use, proving to be an excellent method of aesthetic restoration. Some important features of this technique are its conservative preparation, which avoids an excessive loss of tooth structure and its high aesthetic value provided by the ceramic even when utilized under different color of dental substrates. The aim of this paper was to report a clinical case with full crowns, porcelain veneers and non-prep veneers, enhancing peculiarities related to the material used, tooth preparation techniques, cementing, indications and contraindications.

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A gestão de resíduos em distribuidoras de eletricidade é bastante complexa, pois enquadram-se em vários tipos (valorizados ou não) e gerados em grande quantidade. Em 2009, a AES Eletropaulo gerou quase quatro mil toneladas de resíduos não perigosos, subdivididos em 30 tipos. Uma divisão por materiais, após desmontagem e separação dos diferentes materiais contidos nos fios, cabos, chaves, isoladores com ferragem e para-raios, subiria o valor da venda em R$ 600 mil. Isso geraria cerca de 214 toneladas de porcelana que, moídas, poderiam substituir as 210 toneladas de brita compradas anualmente pela concessionária para uso em subestações. Cerca de 160 toneladas de porcelanas intactas poderiam ser utilizadas na confecção de gabiões para contenção de encostas. Além disso, peças de ferro galvanizado poderiam ser decapadas e novamente galvanizadas para reaproveitamento.