Flexural properties of fiber reinforced root canal posts

Lassila, Lippo; Tanner, Johanna; Bell, Anna-Maria Le; Narva, Katja K.; Vallittu, Pekka K.

doi:10.1016/s0109-5641(03)00065-4

Cited by 332 publications

(329 citation statements)

References 18 publications

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“…The most common engineering composites are composed of strong fibers retained by a matrix 17,18) . Some important factors influencing the mechanical properties of the fiber posts include intrinsic properties, such as the elastic and flexural moduli, surface treatment of the fibers and their impregnation in resin, bonding between the fibers and the matrix, the fiber density 9) , diameter, orientation, position1 [8][9][10][11][12][13][14][15][16][17][18][19] , and water absorption by the matrix 9,18) . One of the most important chemical factors influencing the resistance of the post is related to the process of bonding between the fibers and the resin matrix.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

“…The cylindrical fiber posts were tested in the Universal Testing Machine (EMIC DL 2000) according to ISO 10477:1992 9,11,14,15) (Fig. 1b).…”

Section: Three-point Flexural Strength Testmentioning

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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“…Continuous unidirectional FRC, which is used in the load-bearing part of the FRC-BG implant, has flexural strength of 1200 MPa, whereas the mesh-like FRC laminate of the outer and inner surface is having strength of 400-600 MPa due to lower reinforcing efficiency factor (Krenchel's factor) by the bidirectionally directed fibers [50,51]. It needs to emphasize that the load-bearing capacity for the implant structure comes from the FRC material properties and from the sandwich structure of the implant, its shape, its initial screw fixation and finally from the osseointegration and bone ingrowth.…”

Section: Implant Frameworkmentioning

confidence: 99%

Bioactive glass-containing cranial implants: an overview

Vallittu

2017

J Mater Sci

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Although metals have successfully been used as implants for decades, devices made out of metals do not meet all clinical requirements. For example, metal objects may interfere with some medical imaging systems (computer tomography, magnetic resonance imaging), while their stiffness also differs from natural bone and may cause stress-shielding and over-loading of bone. There has been a lot of development in the field of composite biomaterial research, which has focused to a large extent on biodegradable composites. This overview article reviews the rationale of using glass fiber-reinforced composite-bioactive glass (FRC-BG) in cranial implants. For this overview, published scientific articles with the search term ''bioactive glass cranial implant'' were collected for having basis to introduce a novel design of composite implant, which contains bioactive glass. Additional scientific information was based on articles in the fields of chemistry, engineering sciences and dentistry. Published articles of the material properties, biocompatibility and possibility to add bioactive glass to the FRC-BG implants alongside with the clinical experience as far suggest that there is a clinical need for bioactive nonmetallic implants. In the FRC-BG implants, biostable glass fibers are responsible for the load-bearing capacity of the implant, while the dissolution of the bioactive glass particles supports osteogenesis and vascularization and provides antimicrobial properties for the implant. Material combination of FRC-BG has been used clinically in cranioplasty and cranio-maxillo-facial implants, and they have been investigated also as oral and orthopedic implants. Material combination of FRC-BG has successfully been introduced to be a potential implant material in cranial surgery.

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“…In the 1990s, a construction method using a carbon fiber post in combination with a resin core having an elastic modulus similar to that of dentin was invented 5) . More recently, posts made of semitransparent or white glass fiber or quartz fiber have become in mainstream use to improve the appearance of the full ceramic restored tooth 6) . Moreover, restoration of a crown with a combination of fiber post and full-ceramic crown leads to a metal-free treatment and is useful as a countermeasure to metal allergy 7) .…”

Section: Introductionmentioning

confidence: 99%

Development of a new direct core build-up method using a hollow fiber-reinforced post

et al. 2013

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We have developed a new direct construction method for core build-up starting with the hypothesis that an improvement in pullout strength and a decrease in the number of voids in the restorative material will become possible by filling a hollow fiber reinforced post with the restorative material from the bottom of the root canal. For the pullout test, the hollow post was fixed to the head of a mixing tip and inserted into the bottom of a cylinder. The restorative material was then injected through the hollow post. The pullout load of the hollow posts was significantly higher than that of the solid fiber posts. The number of voids observed in the restorative material when using the hollow post was about 1/5 of that in the case of the solid post.

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Flexural properties of fiber reinforced root canal posts

Cited by 332 publications

References 18 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

Bioactive glass-containing cranial implants: an overview

Development of a new direct core build-up method using a hollow fiber-reinforced post

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