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3D FEA of cemented glass fiber and cast posts with various dental cements in a maxillary central incisor.

Madfa AA, Al-Hamzi MA, Al-Sanabani FA, Al-Qudaimi NH, Yue XG - Springerplus (2015)

Bottom Line: Finite element models were constructed and oblique loading of 100 N was applied.There was negligible difference in peak of shear stress when various cements were compared, irrespective of post materials.This study found that the glass fiber dental post reduced the shear stress concentration at interfacial of post and cement/dentine compared to Ni-Cr alloy cast dental post.

View Article: PubMed Central - PubMed

Affiliation: Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Dhamar, Yemen.

ABSTRACT
This study aimed to analyse and compare the stability of two dental posts cemented with four different luting agents by examining their shear stress transfer through the FEM. Eight three-dimensional finite element models of a maxillary central incisor restored with glass fiber and Ni-Cr alloy cast dental posts. Each dental post was luted with zinc phosphate, Panavia resin, super bond C&B resin and glass ionomer materials. Finite element models were constructed and oblique loading of 100 N was applied. The distribution of shear stress was investigated at posts and cement/dentine interfaces using ABAQUS/CAE software. The peak shear stress for glass fiber post models minimized approximately three to four times of those for Ni-Cr alloy cast post models. There was negligible difference in peak of shear stress when various cements were compared, irrespective of post materials. The shear stress had same trend for all cement materials. This study found that the glass fiber dental post reduced the shear stress concentration at interfacial of post and cement/dentine compared to Ni-Cr alloy cast dental post.

No MeSH data available.


Related in: MedlinePlus

Shear stress distributions in ZY direction at the posts and cement/dentine interface
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Fig7: Shear stress distributions in ZY direction at the posts and cement/dentine interface

Mentions: Two sites of severe interfacial shear stress concentrations were identified. The shear stress was concentrated at the interface of coronal region of root (dentine) and dental post and at the interface of apical region of root (dentine) and post (Figs. 5, 6, 7). This indicates that the interfacial failure initiation should be expected to start from the coronal and the apical regions of the dental post. The transition between positive and negative interfacial stress occurred at middle region of the root where the value of interfacial stress reached zero. Similar trends were obtained among different dental cements as exhibited in Figs. 5, 6 and 7.Fig. 5


3D FEA of cemented glass fiber and cast posts with various dental cements in a maxillary central incisor.

Madfa AA, Al-Hamzi MA, Al-Sanabani FA, Al-Qudaimi NH, Yue XG - Springerplus (2015)

Shear stress distributions in ZY direction at the posts and cement/dentine interface
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4627971&req=5

Fig7: Shear stress distributions in ZY direction at the posts and cement/dentine interface
Mentions: Two sites of severe interfacial shear stress concentrations were identified. The shear stress was concentrated at the interface of coronal region of root (dentine) and dental post and at the interface of apical region of root (dentine) and post (Figs. 5, 6, 7). This indicates that the interfacial failure initiation should be expected to start from the coronal and the apical regions of the dental post. The transition between positive and negative interfacial stress occurred at middle region of the root where the value of interfacial stress reached zero. Similar trends were obtained among different dental cements as exhibited in Figs. 5, 6 and 7.Fig. 5

Bottom Line: Finite element models were constructed and oblique loading of 100 N was applied.There was negligible difference in peak of shear stress when various cements were compared, irrespective of post materials.This study found that the glass fiber dental post reduced the shear stress concentration at interfacial of post and cement/dentine compared to Ni-Cr alloy cast dental post.

View Article: PubMed Central - PubMed

Affiliation: Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Dhamar, Yemen.

ABSTRACT
This study aimed to analyse and compare the stability of two dental posts cemented with four different luting agents by examining their shear stress transfer through the FEM. Eight three-dimensional finite element models of a maxillary central incisor restored with glass fiber and Ni-Cr alloy cast dental posts. Each dental post was luted with zinc phosphate, Panavia resin, super bond C&B resin and glass ionomer materials. Finite element models were constructed and oblique loading of 100 N was applied. The distribution of shear stress was investigated at posts and cement/dentine interfaces using ABAQUS/CAE software. The peak shear stress for glass fiber post models minimized approximately three to four times of those for Ni-Cr alloy cast post models. There was negligible difference in peak of shear stress when various cements were compared, irrespective of post materials. The shear stress had same trend for all cement materials. This study found that the glass fiber dental post reduced the shear stress concentration at interfacial of post and cement/dentine compared to Ni-Cr alloy cast dental post.

No MeSH data available.


Related in: MedlinePlus