3D FEA of cemented steel, glass and carbon posts in a maxillary incisor

Lanza, Alessandro; Aversa, Raffaella; Rengo, Sandro; Apicella, Davide; Apicella, Antonio

doi:10.1016/j.dental.2004.09.010

Cited by 267 publications

(241 citation statements)

References 27 publications

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“…The choice of a suitable material for intraradicular retainers is still controversial and generates discussion in the dental community [2][3][4][5][6] . In addition to retention, one of the important requirements of intraradicular retainers is their effect in terms of homogeneous distribution of stress on the restored assembly.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to retention, one of the important requirements of intraradicular retainers is their effect in terms of homogeneous distribution of stress on the restored assembly. Accordingly, fiber reinforced composite (hereon: fiber) posts seem to better fulfill this biomechanical aspect, as they have a Young's modulus similar to dentin 1,[3][4][5] . The fact that these materials are also more biomechanically compatible also contributes to reduce the risk of root fracture [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

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Fiber-matrix integrity, micromorphology and flexural strength of glass fiber posts: Evaluation of the impact of rotary instruments

Pereira

Lançanova

Wandscher

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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Several rotary instruments have been daily employed on clinic to promote cut aiming to adjust the length of fiber posts to the radicular conduct, but there is no information on the literature about the effects of the different rotary instruments and its impact on the micromorphology of surface and mechanical properties of the glass fiber post. This study aimed the impact of rotary instruments upon fiber-matrix integrity, micromorphology and flexural-strength of glass-fiber posts (GFP). GFP (N=110) were divided into 5 groups: Ctrl: as-received posts, DBc: coarse diamond-bur, DBff: extra-fine diamond-bur, CB: carbide-bur, DD: diamond-disc. Cutting procedures were performed under abundant irrigation. Posts exposed to rotary instruments were then subjected to 2-point inclined loading test (compression 45°) (n=10/group) and 3-point flexural-strength test (n=10/group). Fiber-matrix integrity and micromorphology at the cut surface were analyzed using a SEM (n=2/group). Cutting procedures did not significantly affect the 2-point (51.7±4.3-56.7±5.1 MPa) (p=0.0233) and 3-point flexural-strength (671.5±35.3-709.1±33.1 MPa) (p=0.0968) of the posts (One-way ANOVA and Tukey s test). Fiber detachment was observed only at the end point of the cut at the margins of the post. Cut surfaces of the CB group were smoother than those of the other groups. After 3-point flexural strength test, fiber-matrix separation was evident at the tensile side of the post. Rotary instruments tested with simultaneous water-cooling did not affect the resistance of the tested fiber posts but caused disintegration of the fibers from the matrix at the end of the cut, located at the margins. VALANDRO; Email: lfvalandro@hotmail.com Tel: (55) Fax: (55) 55-3220-927 2 ABSTRACTThis study assessed the impact of rotary instruments upon fiber-matrix integrity, micromorphology and flexural strength of glass fiber posts (GFP). Glass fiber posts (N=110) were divided into 5 groups: Ctrl: Asreceived posts, DBc: Coarse diamond bur, DBff: Extra-fine diamond bur, CB: Carbide bur, DD: Diamond disc. Cutting procedures were performed under abundant irrigation. Posts exposed to rotary instruments were then subjected to 2-point (compression 45°) (n=10/group) and 3-point flexural strength (n=10/group).Fiber-matrix integrity and micromorphology at the cut surface were analyzed using a Scanning Electron Microscope (n=2/group). Cutting procedures did not significantly affect the 2-point (51.7±4.3 -56.7±5.1 MPa) (p=0.0233) and 3-point flexural strength (671.5±35.3 -709.1±33.1 MPa) (p=0.0968) of the posts (One-way ANOVA and Tukey's test). Fiber detachment was observed only at the end point of the cut at the margins of the post. CB cut surfaces was smoother than those of the other groups. After 3-point flexural strength test, fiber-matrix separation was evident at the tensile side of the post.3

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fiber-matrix integrity, micromorphology and flexural strength of glass fiber posts: Evaluation of the impact of rotary instruments

Pereira

Lançanova

Wandscher

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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show abstract

“…All materials were assumed as homogeneous, isotropic and linearly elastic; except for the glass fiber post (GFP) ( Table 3), which was assumed as orthotropic, homogeneous and linearly elastic (19). GFP was assumed as orthotropic since its mechanical properties are different along the fiber (x) and normal directions (y and z).…”

Section: Properties Of Materialsmentioning

confidence: 99%

“…GFP was assumed as orthotropic since its mechanical properties are different along the fiber (x) and normal directions (y and z). Thus, the mechanical characteristics of these materials were represented by the Young modulus in the 3 axes (Ex, Ey, Ez), while Poisson ratio (vxz, vxz, vyz) and shearing modulus (Gxz, Gxz, Gyz) in the orthogonal planes (xy, xz and yz) ( Table 3) (19). All structures of the models were assumed as perfectly joined, which means no failure at bonding and interposition.…”

Section: Properties Of Materialsmentioning

confidence: 99%

Reliability of FEA on the Results of Mechanical Properties of Materials

et al. 2015

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The present study evaluated the reliability of FEA on the results of different mechanical properties (E and v) of materials. Two 3D models of a maxillary canine with endodontic treatment, intracanal post, composite resin core and restored with porcelain-fused-tometal crown were generated according to micro-CT images. Two groups with different E and ν values for porcelain, metal coping alloy, resin cement and composite resin were established. The materials' properties for group GL were based on literature data, while for group GIE the impulse excitation technique was used. A load of 180 N was applied at 45° on the incisal third of the lingual surface of the canine tooth. All models were supported by the periodontal ligament (x=y=z=0). The von Mises stress (VMS) was calculated. The stress values revealed differences between the groups for both VMS distribution and value. The porcelain (GL: 5.966 MPa; GIE: 7.478 MPa), metal coping (GL: 3.811 MPa; GIE: 0.973 MPa) and core (GL: 4.771 MPa; GIE: 0.026 MPa) were significantly affected. In conclusion, this study showed that the determination of mechanical properties (E and ν) of materials is essential for the reliability on the results of FEA.

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“…Em um estudo utilizando a análise de elementos finitos em duas dimensões foi comprovado que pinos de fibra produzem menor concentração de tensões na dentina radicular circundante à ponta do pino do que os pinos metálicos (118) . Outros estudos tiveram os mesmos resultados (119,120) .…”

Section: Ensaio De Push-outunclassified

Avaliação dos ensaios de microtração, push-out e pull-out: resistência de união entre pino de fibra e dentina radicular, análise de elementos finitos e microscopia confocal

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3D FEA of cemented steel, glass and carbon posts in a maxillary incisor

Cited by 267 publications

References 27 publications

Fiber-matrix integrity, micromorphology and flexural strength of glass fiber posts: Evaluation of the impact of rotary instruments

Fiber-matrix integrity, micromorphology and flexural strength of glass fiber posts: Evaluation of the impact of rotary instruments

Reliability of FEA on the Results of Mechanical Properties of Materials

Avaliação dos ensaios de microtração, push-out e pull-out: resistência de união entre pino de fibra e dentina radicular, análise de elementos finitos e microscopia confocal

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