A finite element study of teeth restored with post and core: Effect of design, material, and ferrule

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Abstract

Background:

Different postdesigns and materials are available; however, no consensus exists regarding superiority for stress distribution. The aim of this study was to evaluate the effect of design and material of post with or without ferrule on stress distribution using finite element analysis.

Materials and Methods:

A total of 12 three-dimensional (3D) axisymmetric models of postretained central incisors were made: Six with ferrule design and six without it. Three of these six models had tapered posts, and three had parallel posts. The materials tested were titanium post with a composite resin core, nickel chromium cast post and core, and fiber reinforced composite (FRC) post with a composite resin core. The stress analysis was done using ANSYS software. The load of 100 N at an angle of 45΀ was applied 2 mm cervical to incisal edge on the palatal surface and results were analyzed using 3D von Mises criteria.

Results:

The highest amount of stress was in the cervical region. Overall, the stress in the tapered postsystem was more than the parallel one. FRC post and composite resin core recorded minimal stresses within the post but the stresses transmitted to cervical dentin were more as compared to other systems. Minimal stresses in cervical dentine were observed where the remaining coronal dentin was strengthen by ferrule.

Conclusion:

A rigid material with high modulus of elasticity for post and core system creates most uniform stress distribution pattern. Ferrule provides uniform distribution of stresses and decreases the cervical stresses.

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Most cited references 29

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Comparison of the fracture resistances of pulpless teeth restored with a cast post and core or carbon-fiber post with a composite core.

Arturo Martínez-Ínsua, Luís da Silva, Benito Rilo … (1998)

The survival of pulpless teeth restored with a post and core system is a controversial issue. This study compared the fracture resistance of 2 types of restorations: teeth restored with prefabricated carbon-fiber posts and composite cores to cast dowel-core restored teeth. A total of 44 recently extracted sound premolars were randomly distributed into 2 equal groups: group I, restored with prefabricated carbon-fiber post and a composite core; and group II, with custom-cast type III gold alloy post and cores. The size and shape of the posts were identical in the 2 groups. All teeth were fully covered with a nonprecious cast crown. Fracture resistance was measured by applying a point force at 45 degrees to the long angle of the tooth. Mean fracture threshold was 103.7 +/- 53.1 kg for group I versus 202.7 +/- 125.0 kg for group II (differences significant with P = .003). In group II, however, fracture nearly always affected the tooth itself, whereas in group I, the post-core nearly always failed first. Significantly higher fracture thresholds were recorded for the cast post and core group. Teeth restored with cast posts typically showed fracture of the tooth, although at loads rarely occurring clinically.

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Evaluation of two post core systems using two different methods (fracture strength test and a finite elemental stress analysis).

Mustafa Kalkan, Sema Belli, Gurcan Eskitascioglu (2002)

The aim of this study was to compare a fiber composite laminate (FCL) post core and a conventional cast post core system by using two different methods. The first method was a conventional fracture strength test, and the second was a finite elemental stress-analysis method (FEM). For the conventional fracture strength test, 20 extracted, human upper, central incisors were used. The teeth were decoronated, treated endodontically, and restored with two post core systems. After embedding the samples in resin blocks, a loading force was applied to the teeth at a crosshead speed of 5 mm/ min at an angle of 45 degrees to the long axis of the tooth. The data were recorded, and the results were compared by using the Mann-Whitney U test. There was no statistically significant difference between the two post systems (p > 0.05). For FEM analysis, a pseudo three-dimensional model of a maxillary central incisor, theoretically restored with either a cast post or an FCL, was used. The analysis was performed by using the structural analysis program (SAP90). FEM analysis showed that stress was accumulated within the cast post core system, and transmission of stress to supportive structures and the tooth was low. This is an advantage for tooth and supporting tissues. When the FCL post core system was evaluated by FEM, the results indicated that this system transferred stress to supportive structures and the tooth while stress accumulation within the post system was low. This is an advantage for the restoration but disadvantage for the supporting tissues.

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Corono-radicular reconstruction of pulpless teeth: a mechanical study using finite element analysis.

Laurent Pierrisnard, Frédéric Bohin, Michel Barquins … (2002)

Following endodontic therapy, teeth need to be protected, particularly in the cervical region, where the majority of fractures occur. The likelihood of a fracture depends on the condition of the crown and the type of reconstruction performed. This simulation study was designed to compare the effect of different corono-radicular reconstruction methods on stress transmission to dental tissues. The study software performed stress analysis of complex structures by finite element analysis. Seven 3-dimensional models were created, each representing a tooth embedded in a bony medium. The following parameters affecting corono-radicular restoration were studied: 2 levels of coronal destruction, core materials, post materials when present, and absence of post. The 2 levels of coronal tissue loss were (1) total tissue loss of the coronal dentin and (2) partial tissue loss of the coronal dentin with 2-mm surviving dentin walls. Teeth with 2 different levels of tissue loss (first study parameter) were reconstructed by 4 different techniques: nickel chromium (NiCr) cast post and core, NiCr post and composite core combination, carbon fiber post and composite core combination, and composite restoration without post. A NiCr crown covered each of the models and received a 30 degrees oblique occlusal load at a constant intensity of 100 N. The software computed the stresses (local tensile stress inducing cracks and compressive stress) for each of the models, comparing maximum intensity observed, localization, and concentration. Whatever the type of stress (tensile or compressive), the greatest stress was observed in the cervical region, regardless of the model. Only tensile stresses potentially responsible for fractures were compared. Cervical tensile stresses exceeded 230 Pa in the absence of a ferrule and were less than 140 Pa when a ferrule was present. In the absence of a ferrule, the NiCr composite/post combination generated greater cervical stress (254 Pa) than the cast post and core (235 Pa). Results with a ferrule showed 92 Pa for the NiCr composite/post combination and 90.5 Pa for the cast post and core. In the presence of a ferrule, the tensile stress intensities generated by the composite restoration with no root canal post (139 Pa) were 51% greater than those generated by the NiCr/composite combination and approximately 26% greater than those generated by the composite/carbon combination. Within the limitations of this study, it was confirmed that all simulated reconstructed teeth were more subject to stress in the cervical region. The absence of a cervical ferrule was found to be a determining negative factor, giving rise to considerably higher stress levels. When no ferrule was present, the NiCr post/composite combination generated greater cervical stress than cast post and cores. Nevertheless, the peripheral ferrule seemed to cancel the mechanical effect of the reconstruction material on the intensity of the stresses. With a ferrule, the choice of reconstruction material had no impact on the level of cervical stress. The root canal post, the purpose of which is to protect the cervical region, was also shown to be beneficial even with sufficient residual coronal dentin. In the presence of a root canal post, cervical stress levels were lower than when no root canal post was present. Moreover, the higher the elasticity modulus, the lower the stress levels.

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Author and article information

Journal

Journal ID (nlm-ta): Dent Res J (Isfahan)

Journal ID (iso-abbrev): Dent Res J (Isfahan)

Journal ID (publisher-id): DRJ

Title: Dental Research Journal

Publisher: Medknow Publications & Media Pvt Ltd (India )

ISSN (Print): 1735-3327

ISSN (Electronic): 2008-0255

Publication date (Print): May-Jun 2016

Volume: 13

Issue: 3

Pages: 233-238

Affiliations

[1 ]Department of Prosthodontics, DAV Dental College, Yamunanagar, Haryana, India

[2 ]Department of Prosthodontics, I.T.S Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India

[3 ]I.T.S Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India

[4 ]Department of Prosthodontics, Kamineni Institute of Dental Sciences, Nalgonda, Andhra Pradesh, India

[5 ]Department of Paper Technology, IIT, Roorkee, Uttarakhand, India

Author notes

Address for correspondence: Dr. Viram Upadhyaya, Department of Prosthodontics, DAV Dental College, Yamunanagar, Haryana, India. E-mail: viram.u@ 123456gmail.com

Article

Publisher ID: DRJ-13-233

DOI: 10.4103/1735-3327.182182

PMC ID: 4878207

PubMed ID: 27274343

SO-VID: 40dd07f4-69ad-4d92-87a1-0eb2b61c89f5

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This is an open access article distributed under the terms of the Creative Commons Attribution NonCommercial ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non commercially, as long as the author is credited and the new creations are licensed under the identical terms.

A finite element study of teeth restored with post and core: Effect of design, material, and ferrule

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Abstract

Background:

Materials and Methods:

Results:

Conclusion:

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Arab Journal of Forensic Sciences & Forensic Medicine (AJFSFM)

Most cited references 29

Comparison of the fracture resistances of pulpless teeth restored with a cast post and core or carbon-fiber post with a composite core.

Evaluation of two post core systems using two different methods (fracture strength test and a finite elemental stress analysis).

Corono-radicular reconstruction of pulpless teeth: a mechanical study using finite element analysis.

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