Effective use of current core and post concepts

Sokol, David J.

doi:10.1016/0022-3913(84)90101-x

Cited by 54 publications

(37 citation statements)

References 16 publications

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“…For treating these teeth, some researchers claimed that root canal post with core systems provide protection for the remaining teeth by distributing intra-oral forces along the roots 4,5) . Numerous kinds of root canal posts are available, but because of the clinical convenience and the specific nature of aesthetics for the anterior region, prefabricated stainless steel posts and glass fiber posts are popularly used.…”

Section: Introductionmentioning

confidence: 99%

Photoelastic stress analysis of endodontically treated teeth restored with different post systems: normal and alveolar bone resorption cases

Miura

Okada

et al. 2011

Dent. Mater. J.

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The present study examined the influence of different post materials and their lengths on the mechanical stress of endodontically treated incisor roots in two alveolar bone conditions. Two-dimensional photoelastic models were fabricated to simulate the endodontically treated maxillary central incisors restored with three kinds of posts materials (low Young's modulus glass fiber post, high Young's modulus glass fiber post, and prefabricated stainless steel post) and two post lengths (8 and 4 mm). Completed models were placed in a transmission polariscope and loaded with a static force of 150 N at 45° to the tooth axis. Photoelastic photographs and the magnitudes of fringe order revealed stress distribution in the root, and suggest that the glass fiber post with a low Young's modulus and long length can reduce the stress concentration both in normal and alveolar bone resorption conditions.

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Section: Introductionmentioning

confidence: 99%

Photoelastic stress analysis of endodontically treated teeth restored with different post systems: normal and alveolar bone resorption cases

Miura

Okada

et al. 2011

Dent. Mater. J.

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“…Cast posts and cores have been the standard for many years and are still used by clinicians (6,7,8). These may be indicated when a tooth is misaligned or when the coronal structure is minimal and the core must be angled in relation to the post to achieve proper alignment (4,9) While metallic posts are generally easy to retrieve when endodontic retreatment is necessary (6,9), they require laboratory charges (2,9), removal of large amounts of sound tissue (10) and the core stiffness is different from dentin (7,11).…”

Section: Introductionmentioning

confidence: 99%

Removal resistance of glass-fiber and metallic cast posts with different lengths

et al. 2006

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“…These results are clinically important because the wear of the dental structure, during endodontic treatments, occurs during the endodontic access and the chemical-mechanical preparation, especially with cervical preparation techniques. The loss of tooth structure because of caries and trauma leads to a more fragile endodontically treated tooth 6,17,22 . Therefore, the clinician must abrade the least amount of dentinal structure possible or only remove gutta-percha from the root canal, respecting the 4-5 mm apical limit and take advantage of the chemical-mechanical preparation already performed by the endodontist for placement of the intraradicular post; thus reducing the risk of fracture 1,14 .…”

Section: Discussionmentioning

confidence: 99%

Effect of the diameter on Cu-Al post retention

et al. 2004

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ABSTRACT:This study compared the resistance to removal by traction of abraded cylindrical metal cast posts of Cu-Al (Goldent-LA). The posts had constant length (9 mm) and three different diameters (0.9, 1.3 and 1.7 mm), and were cemented with zinc phosphate cement. The crowns of 36 sound maxillary canines were sectioned, the roots were immersed in resin blocks and the root canals were endodontically treated. The teeth were divided into three groups to be prepared and standardized with the use of a parallelometer with the following burs: Group 1 -Largo n. 2; Group 2 -Largo n. 4; Group 3 -Largo n. 6. The posts were molded with chemically activated resin and after casting they were abraded and their dimensions were confirmed with a digital caliper. After cementation of the posts in the prepared root canals, the samples were kept at 37ºC in distilled water for 7 days and subsequently submitted to the traction test in a universal testing machine (Instron 4444). The results showed no statistical difference between the groups. Diameter variation (0.9 mm, 1.3 mm and 1.7 mm) in abraded cylindrical posts cemented with zinc phosphate did not affect resistance to removal. DESCRIPTORS: Tensile strength; Post and core technique. RESUMO:Este estudo in vitro comparou a resistência à remoção por tração de núcleos metálicos fundidos em liga de Cu-Al (Goldent-LA) cilíndricos, jateados, de comprimento constante igual a 9 mm, cimentados com cimento de fosfato de zinco e com três diferentes diâmetros: 0,9 mm, 1,3 mm e 1,7 mm. Trinta e seis caninos superiores hígi-dos tiveram suas coroas seccionadas, sendo as raízes incluídas em blocos de resina acrílica, e os canais, tratados endodonticamente. Os dentes foram divididos em três grupos para serem preparados e padronizados com o auxílio de um paralelômetro com as seguintes brocas: Grupo 1 -Largo nº 2; Grupo 2 -Largo nº 4; Grupo 3 -Largo nº 6. Os núcleos foram moldados com resina acrílica ativada quimicamente e, após a fundição, foram jateados e tiveram as suas dimensões conferidas com um paquímetro digital. Após a cimentação, os corpos-de-prova foram armazenados em água destilada durante 7 dias, em estufa a 37ºC e, posteriormente, submetidos a teste de tração em uma máquina universal de ensaios Instron 4444. Com a análise estatística dos resultados, pôde-se concluir que não houve diferença estatisticamente significante entre os grupos testados. A variação do diâmetro em núcleos cilíndricos jateados cimentados com fosfato de zinco não afetou a resistência à remoção.

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Effective use of current core and post concepts

Cited by 54 publications

References 16 publications

Photoelastic stress analysis of endodontically treated teeth restored with different post systems: normal and alveolar bone resorption cases

Photoelastic stress analysis of endodontically treated teeth restored with different post systems: normal and alveolar bone resorption cases

Removal resistance of glass-fiber and metallic cast posts with different lengths

Effect of the diameter on Cu-Al post retention

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