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      ESTUDO DA DISTRIBUIÇÃO DAS TENSÕES INTERNAS, SOB CARGA AXIAL, EM DENTE HÍGIDO E EM DENTE RESTAURADO COM COROA METALOCERÂMICA E RETENTOR INTRA-RADICULAR FUNDIDO: - MÉTODO DO ELEMENTO FINITO Translated title: FINITE ELEMENT ANALYSIS OF INTERNAL STRESS DISTRIBUTION, UNDER AXIAL FORCE, IN SOUND TOOTH, AND IN TOOTH RESTORED WITH METALLOCERAMIC CROWN AND CAST METAL POST AND CORE

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          Abstract

          Estudou-se comparativamente, pelo método do elemento finito em modelo bidimensional de segundo pré-molar inferior, a distribuição de tensões internas, geradas sob carga axial de 30 kgf em três pontos (contatos principal e estabilizante), em dente natural hígido e em dente endodonticamente tratado. O programa utilizado para o processamento do elemento finito foi o SAP90. Os resultados indicaram maior acúmulo de tensões na metade vestibular, tanto no dente hígido quanto no dente restaurado. As tensões foram mais intensas sob o ponto de aplicação de cargas nos dois modelos. No dente restaurado, as tensões foram maiores devido ao maior módulo de elasticidade dos materiais restauradores, demonstrando que existem diferenças na distribuição das tensões no dente e na base óssea dos dois modelos

          Translated abstract

          This study compared the internal stress distribution in a sound tooth with that in an endodontically treated tooth, by the finite element method, in a two-dimensional, lower premolar model, under an axial load of 30 kgf applied to three points (primary occlusal contact and stabilizing occlusal contact). Results indicated that there was a greater cumulation of stress in the buccal half of both teeth. In both models, peak stress was observed at the places where loads were applied. The restored tooth presented greater stress due to the greater Young's modulus of the utilized restoring materials. It was therefore demonstrated that there are differences in the distribution of internal stress between both models

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          Implant-bone interface characteristics of bioglass dental implants.

          Three-dimensional finite element analysis (FEA) has been used to determine the implant-bone interface characteristics of bioglass dental implants. The results of the FEA were verified by comparison with the results of mechanical testing performed on animal implant specimens. The results of the study showed that the assumption of a discontinuous change of elastic properties at the bone-implant interface was a poor assumption for the bioglass implants. Interface elastic moduli of 354.0, 155.0, and 47.0 MPa for conditions of 25, 50, and 100% tissue attachment were determined for the bioglass implants.
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            A 3-year postoperative clinical evaluation of posts and cores beneath existing crowns.

            Fabrication of posts and cores for fixed partial denture (FPD) and removable partial denture (RPD) abutment restorations is common in dentistry. The biocompatibility of various post and core techniques with the restorations was clinically evaluated according to location and function. In this study, 154 post and core constructions for 150 patients were observed for a 3-year period to determine if the function of the original restorations remained unsatisfactory. The following techniques were included: (1) screw post and light-curing composite resins, (2) cemented post with parallel sides and light-curing composite resins, and (3) a cast and core technique. Seventeen of the 154 restorations failed; four failures were attributed to root fractures, three to radicular caries, and five to crown dislodgement, while five failures were from detachment of the post and core from the root. The statistical analysis revealed that only the factor "type of abutment" (RPDs and FPDs) had some effect on the failure of the restorations.
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              Finite element analysis of dental structures--axisymmetric and plane stress idealizations.

              The finite element method used to study stress generated in a maxillary second premolar as a result of occlusal forces. This mathematical technique has been applied extensively in structural engineering and structural mechanics. It is well suited to the analysis of stress in teeth and dental restorations because it can closely simulate the geometries, loads, and material inhomogeneities in the system being studied.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rousp
                Revista de Odontologia da Universidade de São Paulo
                Rev Odontol Univ São Paulo
                Universidade de São Paulo (São Paulo )
                0103-0663
                April 1997
                : 11
                : 2
                Affiliations
                [1 ] Universidade de São Paulo Brazil
                [2 ] Universidade de São Paulo Brazil
                Article
                S0103-06631997000200006
                10.1590/S0103-06631997000200006
                c65d8a9a-9c25-4426-a8eb-042243e52613

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

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-0663&lng=en
                Categories
                DENTISTRY, ORAL SURGERY & MEDICINE

                Dentistry
                Cast metal post and core,Internal stress distribution,Retentor intra-radicular fundido,Método do elemento finito,Finite element method,Distribuição de tensões internas

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