A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown

Mahmoudi, Mojtaba; Saidi, A.R.; NASSAB, Saied Abdolreza GANDJALIKHAN; Hashemipour, Maryam Alsadat

doi:10.4012/dmj.2011-138

Cited by 19 publications

(14 citation statements)

References 22 publications

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“…Research shows that the presence of a 1.5-2.0 mm height of tooth structure above the gingiva is more important for preventing fracture than use of a post, [11,12] although some authors suggest that the bond strength of a resin bonded post reduces the need for a ferrule effect. [13][14][15][16][17][18] Beyond 3 mm of ferrule tooth structure height, there is little improvement in abutment fracture resistance. [19,20] When an abutment has a post, a retentive ferrule causes forces placed on a crown to transmit to the cemento-enamel junction (CEJ) area; here, if the abutment fails, it tends to fail via a horizontal fracture.…”

Section: Research and The Ferrule Effectmentioning

confidence: 99%

On the ferrule effect and the biomechanical stability of teeth restored with cores, posts, and crowns

Mamoun¹

2014

Eur J Dent

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An abutment for a fixed partial denture may not contain enough tooth structure, such that the abutment does not provide an adequate ‘ferrule effect’. A crown or bridge dental prosthesis that is cemented onto such an abutment/s may undergo biomechanical failure. Here, the tooth, core, and post complex, on which the crown is cemented, may fracture off from the abutment, causing the crown to separate from the abutment, while the cement that bonds the crown to the tooth, core, and post complex remains intact, such that the tooth, core, and post complex remains inside the crown when the crown separates from the abutment. This article reviews the dentistry literature on the ferrule effect, and presents alternative definitions for terms such as ferrule, the ferrule effect, and the ferrule tooth structure. The article also explains how the use of a surgical operating microscope, or high magnification binocular surgical loupes of ×6-8, or greater magnification improve the ability of a dentist to assess how much ferrule tooth structure an abutment contains, compared to the use of unaided vision.

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Section: Research and The Ferrule Effectmentioning

confidence: 99%

On the ferrule effect and the biomechanical stability of teeth restored with cores, posts, and crowns

Mamoun¹

2014

Eur J Dent

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“…The elastic modulus and mechanical properties of the materials used have a significant impact on the transmission and distribution of force (15).…”

Section: Discussionmentioning

confidence: 99%

“…It allows a certain level of movement of the tooth against force and it supports the tooth, holding it in place during function. Increased stress on the PDL impairs this mechanism and if it continues, can cause increased stress on the alveolar bone (15).…”

Section: Discussionmentioning

confidence: 99%

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An evaluation using micro-CT data of the stress formed in the crown and periodontal tissues from the use of Peek post and Peek crown: A 3D finite element analysis study

2018

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Aim: Metal-supported ceramics as crown material and glass fibre posts as dental post materials are in frequent current use. In recent years, it has been claimed that stress-based biomechanical problems in dentistry can be resolved with the benefit of the low elasticity modulus of polyetheretherketone (PEEK) material. The aim of this study was to use finite element analysis (FEA) to compare the stresses formed by forces applied after the use of PEEK material as dental post and crown material as an alternative to glassfibre posts and metal-supported ceramic crowns. Material and Method: The stress analysis metthod used in this study was FEA. First, micro-computed tomography (micro-CT) images were obtained of a maxillary central incisor tooth and the data of the post materials scanned with a 3-dimensional (3D) laser scanner were uploaded to a computer program. 3D models were obtained with designs made in the computer program of all the materials. The modelling of a maxillary central tooth was completed using 2 different post materials (glassfibre and PEEK) and 2 different crown materials (metal ceramic and PEEK) and 4 groups were formed for analysis. By applying force of 100N at 135˚ from the absolute central point of the palatinal surface of the tooth, the stress values and distribution occurring in the 3D peiodontal models were compared. Results: The use of PEEK post reduced the stresses occurring on the periodontal ligament (PDL) and the cortical bone, and caused no significant change in the stresses on the crown. The use of PEEK crown reduced the stresses occurring on the crown and increased the stresses occurring on the PDL and cortical bone. Conclusion: With further in vitro and clinical studies of PEEK material, it can be considered that within a short time PEEK post and PEEK crown could be in routine use in dentistry.

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“…In the past, studies of stress concentrations in crowns and abutment roots restored by various materials simultaneously under loading have used FEA 26,27) and strain gauge method 20) . However, these studies simulated FPDs and abutment root restoration by various materials has not yet been reported.…”

Section: Experimental Methodsmentioning

confidence: 99%

Influence of post and core materials on distortion around 4-unit zirconia bridge margins

et al. 2014

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The purpose of this study was to evaluate the surface strain of zirconia fixed partial denture frameworks and their abutment roots when restored with two types of post and core materials. Artificial mandibular first premolars and second molars were used as the abutment teeth. Posts and cores were of two types: resin composite with glass fiber posts (RC) and cast platinum gold alloy (MC). The cores and 4-unit zirconia frameworks were bonded to the specimens. Static loading was applied to the occlusal surfaces, and the surface strain of the frameworks and roots (distal premolar and mesial molar) was measured by strain gauge method. Premolar root showed a significantly higher magnitude of principal strain than molar root. RC showed a significantly higher magnitude of principal strain than MC. The results suggest that MC restrain the surface strain compared to RC when the missing teeth are replaced by a 4-unit zirconia framework.

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A three-dimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown

Cited by 19 publications

References 22 publications

On the ferrule effect and the biomechanical stability of teeth restored with cores, posts, and crowns

On the ferrule effect and the biomechanical stability of teeth restored with cores, posts, and crowns

An evaluation using micro-CT data of the stress formed in the crown and periodontal tissues from the use of Peek post and Peek crown: A 3D finite element analysis study

Influence of post and core materials on distortion around 4-unit zirconia bridge margins

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