Four different core materials measured for fracture strength in combination with five different designs of endodontic posts

Cohen, Beverly S.; Pagnillo, Mark K.; Condos, Spyridon; Deutsch, Allan S.

doi:10.1016/s0022-3913(96)90006-2

Cited by 63 publications

(42 citation statements)

References 23 publications

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“…Foram encontrados 79% de falhas nos núcleos de preenchimento e 21% das falhas restantes ocorreram por fratura da raiz, concluindo que o ponto crítico quando se usa pino pré-fabricado e núcleo de preenchimento é um micromovimento do núcleo de preenchimento, podendo gerar falha na adaptação da coroa e infiltração marginal 15 . Em nosso trabalho, verificamos também que o micromovimento, provocado pela força aplicada, aumentou as tensões na união do pino/resina composta, exceto para o pino metálico fundido que teve a dissipação das tensões bem mais favorável.…”

Section: Distribuição Das Tensões Relacionadas Ao Uso De Retentores Eunclassified

Distribuição das Tensões Relacionadas ao Uso de Retentores em Dentes Tratados Endodonticamente Utilizando o Método dos Elementos Finitos

Oliveira¹,

Ferreira²,

Graça³

et al. 2012

Pesqui. bras. odontopediatria clín. integr.

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; Cresus Vinícius Depes de GOUVÊA 4 A restauração dos dentes tratados endodonticamente, com grande fragilidade de suas estruturas, traz dúvidas ao clínico quanto à melhor forma de atuar nesses elementos. Os retentores intrarradiculares, sejam núcleos metálicos fundidos ou pré-fabricados, são geralmente necessários para a restauração destes elementos. Cada um desses materiais imprime uma força diferente nas estruturas adjacentes, sendo o entendimento destas uma necessidade para a melhor escolha e aplicação clínica do retentor. Objetivo: A proposta do presente trabalho é analisar e avaliar a distribuição de tensões no complexo dente-periodonto pelo método dos elementos finitos bidimensional com a utilização de diferentes tipos de retentores. Método: Este estudo tem por base modelos matemáticos de um canino superior tratado endodonticamente com a utilização de retentores intrarradiculares metálicos fundidos em NiCr, metálicos pré-fabricados em titânio. Os modelos foram submetidos a uma carga de 100 N por palatina em um ângulo de 45º. A análise e avaliação das tensões foram realizadas para cada um dos modelos e seus diferentes tipos de pinos. Resultados: A maior concentração de tensões se deu com o uso do pino metálico pré-fabricado de titânio, com valores de tração que oscilam entre 1.207 MPa a 4.878 MPa e de compressão entre -9.806 MPa a -2.464 MPa. O pino metálico fundido imprimiu tensões de menores valores, mais homogêneas e uniformes, tendo seus valores de tração variando de 1.287 MPa a 4.919 Mpa e seus valores de compressão variando de -9.607 MPa a 2.344 Mpa. Conclusão: Os pinos intrarradiculares metálicos pré-fabricados de titânio geram forte estresse no sistema dente-periodonto, sendo o menos indicado clinicamente. O mais indicado para uso clínico foi o pino metálico fundido, cuja tensão se manifestou de maneira mais uniforme no elemento dentário.Biomecânica; Propriedades físicas; Técnica para retentor intrarradicular.The restoration of endodontically treated teeth with great structure fragility challenges the clinician about the best way to proceed on these elements. The use of intracanal retainers, either post and core systems of prefabricated posts, is usually necessary to restore this kind of teeth. Each one of these materials exerts a different force on the adjacent structures and understanding these forces is mandatory for a better choice and clinical application of intracanal retainers. Objective: The purpose of this study was to analyze and evaluate the stress distribution in the tooth-periodontium complex by the twodimensional finite element method, using different types of retainers. Methods: This study was based on mathematical models of an endodontically treated maxillary canine, using a NiCr cast intracanal posts and a prefabricated titanium post. The models were subjected to a 100 N load directed palatally at a 45º angle. The strains for each of the models and different types of post were analyzed and evaluated. Biomechanics; Physical properties; Post and core technique.

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Section: Distribuição Das Tensões Relacionadas Ao Uso De Retentores Eunclassified

Distribuição das Tensões Relacionadas ao Uso de Retentores em Dentes Tratados Endodonticamente Utilizando o Método dos Elementos Finitos

Oliveira¹,

Ferreira²,

Graça³

et al. 2012

Pesqui. bras. odontopediatria clín. integr.

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“…Moreover, PPS GF40 possessed a structure similar to the glass fiber post used in dentistry in that it was manufactured by bundling thousands of pieces of glass fibers and bonding with resin, and would hence exhibit a mechanical behavior similar to that of the glass fiber post. Based on studies pertaining to metal core 9,[31][32][33] and the length of dowel post [18][19][20] , the length of the post in this study was decided to be 80 mm, which was 2/3 of the length of the root and was also equal to the height of the core. With the photoelastic method, the data obtained from each model were compared with the corresponding figure. Since the magnitude of stress is proportional to the isochromatic fringe order, comparison is possible regardless of the load magnitude.…”

Section: Loading Testmentioning

confidence: 99%

Photoelastic stress analysis of different post and core restoration methods

et al. 2009

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The aim of this study was to compare three types of post and core systems by analyzing the stress magnitude within the root. To this end, two-dimensional photoelastic simulation models of endodontically treated maxillary central incisors were fabricated. Three different types of post and core systems were selected for this study: composite resin post and core, composite resin core in combination with a glass fiber post, and conventional cast metal post and core. The fabricated models were observed in a transmission polariscope with the same loading force (400 N) on 45° palatal direction and the fringe orders registered were thereby analyzed. Results obtained in this study suggested that abutment build-up using composite resin core in combination with a glass fiber post model produced the lowest stress concentration and is hence effective in preventing stress concentration in the case of restored endodontically treated teeth.

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“…The endodontically treated teeth (ETT) for anterior teeth traditionally were restored with post and core as a foundation for the permanent restoration to replace the loosed coronal portion (Gutma 1992, P. 458; Cohen BI et al, 1996, p. 487; Preethi & Kala, 2008, p. 162). Although the need for crown coverage for an ETT is still convective, and no recent clinical study is a valuable to confirm the indications given in the literature (Sorenson JP et al, 1984, p.780, Paul & Scharer, 1998, p. 513) [4][5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of maxillary anterior endodontically treated teeth restored with different types of crowns

Moaleem

Mobaraky²,

Madkhali³

et al. 2017

IJDR

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Statement of the problem: restoring endodontically treated teeth (ETT) is one of the major treatments provided by a dentist. Glass fiber posts (GFP) showed good clinical performance during last few years. Aim of the study; to assess and compare the clinical as well as the radiographic performance of different types of ceramic crown systems used in restoration of maxillary anterior teeth over a cemented GFP and composite resin core. Materials and methods: 50 ETT with GFP were included in this study. These teeth were divided into four gropes (composite resin. Porcelain fused to metal (PFM), e. max and zirconia restorations). Both the clinical and radiographic assessments were done for the restoration at a period of one week, 3, 6, 9, and 12 months after composite build up and crown's cementations. All data were registered and analyzed by SPSS program using percentages and Kaplan-Meyer analysis. Fisher's exact test was used for categorical values while logrank test was used for descriptive statistical analysis. Results: the clinical assessment showed no changes in the one week, 3 and 6 months in the four groups. While during the 9 and 12 months, a movement of the crown margin under finger pressure was present in one case, loss or retention in 2 cases of zirconia, the periodontal status with violation of biological width was present in one case of PFM and finally the color changes were obvious in one case of PFM and 2 cases of composite restoration. All the restorations in the four groups had no radiographic changes in the one week and three-month assessments. While during six-month follow-up, a loosed of retention in one case of the zirconia crown was detected. At the 9 and 12 months, two cases showed recurrent caries at the cervical margin of the composite restoration, cases with periapical infection and other with loss of retention of the post were recorded in the PFM restoration. Conclusion: e. Max and zirconia all ceramic crowns showed better clinical and radiographic performance than the PFM and composite restorations over 12 months recall.

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Four different core materials measured for fracture strength in combination with five different designs of endodontic posts

Cited by 63 publications

References 23 publications

Distribuição das Tensões Relacionadas ao Uso de Retentores em Dentes Tratados Endodonticamente Utilizando o Método dos Elementos Finitos

Distribuição das Tensões Relacionadas ao Uso de Retentores em Dentes Tratados Endodonticamente Utilizando o Método dos Elementos Finitos

Photoelastic stress analysis of different post and core restoration methods

Evaluation of maxillary anterior endodontically treated teeth restored with different types of crowns

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