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      Comportamento biomecânico das cerâmicas odontológicas: revisão Translated title: Biomechanical behavior of dental ceramics: review

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          Abstract

          Os sistemas cerâmicos representam hoje na odontologia uma alternativa aos metais no tratamento protético. No entanto, esses materiais não atingiram os mesmos resultados a longo prazo da convencional prótese metalocerâmica. Na maioria dos casos, principalmente em próteses anteriores, o comportamento desses materiais é satisfatório. Entretanto, à medida que a demanda por estética exige a utilização de materiais cerâmicos nas regiões posteriores, as taxas de falhas aumentam. Com isso, sabendo o que se pode esperar de cada material é possível não só indicar ou contra-indicar a utilização destas próteses, mas também desenvolver novos materiais e técnicas. O objetivo desta revisão foi apresentar os diversos sistemas cerâmicos e seu comportamento mecânico durante a utilização clínica, relatando as localizações, os tipos e as regiões das falhas mais frequentes nos sistemas atuais, visando à busca por soluções.

          Translated abstract

          The current ceramic systems in dentistry represent an alternative to metals in prosthetic treatment. However, these materials did not reach the same long-term results of conventional metal-ceramic prosthesis. In most cases, especially in anterior prostheses, the behavior of these materials is satisfactory. Nevertheless, as the demand for aesthetics requires the use of ceramics in the posterior regions, the rate of failure increases. Therefore, knowing what to expect of each material makes it possible not only to indicate or contraindicate the use of these prostheses, but also to develop new materials and techniques. The objective of this review was to explain the various ceramic systems and their mechanical behavior during the clinical use, reporting the locations, types and regions of most frequent failures in current systems in the search for solutions.

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          Chemosynthesis of bioresorbable poly(gamma-butyrolactone) by ring-opening polymerisation: a review.

          Recent advances in the synthesis of poly(gamma-butyrolactone) have yielded homopolymers of up to 50,000 Mw from the low-cost monomer gamma-butyrolactone. This monomer has for the better part of a century been thought impossible to polymerise. Poly(gamma-butyrolactone) displays properties that are ideal for tissue-engineering applications and the bacterially derived equivalent, poly(4-hydroxybutyrate) (P4HB), has been evaluated for such uses. The glass transition temperature (-48 to -51 degrees C), melting point (53-60 degrees C), tensile strength (50 MPa), Young's modulus (70 MPa) and elongation at break (1000%) of P4HB make it a very useful biomaterial. Poly(gamma-butyrolactone) degrades to give gamma-hydroxybutyric acid which is a naturally occurring metabolite in the body and it has been shown to be bioresorbable. Investigation into the synthesis of poly(gamma-butyrolactone) has recently produced homo-oligomeric diols 400-1000 Mw that are suitable for reacting with diisocyanates to form polyurethanes. Biodegradable polyurethanes made from diols of polyglycolide (PGA) and poly(epsilon-caprolactone) (PCL) have the disadvantage of high glass transition and slow degradation, respectively. Poly(gamma-butyrolactone) can be thought of as being the missing link in the biodegradable polyester family immediately between PGA and PCL and displaying intermediate properties.
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            Int. J. Prosthodont

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              Oper. Dent

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ce
                Cerâmica
                Cerâmica
                Associação Brasileira de Cerâmica (São Paulo )
                1678-4553
                June 2010
                : 56
                : 338
                : 148-155
                Affiliations
                [1 ] Universidade de São Paulo Brazil
                [2 ] Fundação Bauruense de Estudos Odontológicos
                Article
                S0366-69132010000200009
                10.1590/S0366-69132010000200009
                688f6985-bb9b-463d-a20c-4daca58f5dec

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0366-6913&lng=en
                Categories
                MATERIALS SCIENCE, CERAMICS

                Ceramics
                ceramics,biomechanics,denture partial fixed,cerâmica,biomecânica,prótese parcial fixa
                Ceramics
                ceramics, biomechanics, denture partial fixed, cerâmica, biomecânica, prótese parcial fixa

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