A comparison of two post systems under applied compressive-shear loads

Greenfeld, Raymond S.; Roydhouse, Richard H.; Marshall, F. J.; Schoner, Bertram

doi:10.1016/0022-3913(89)90101-7

Cited by 48 publications

(27 citation statements)

References 30 publications

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“…It has been postulated that when the cement lute fails the fulcrum point moves in an apical direction. This can increase the lever arm and magnify stresses, leading to further degradation of the cement and an increase in apical stress, which may cause root fracture (1,2).…”

Section: Introductionmentioning

confidence: 99%

In vitro evaluation of the retention of zirconia-based ceramic posts luted with glass ionomer and resin cements

et al. 2005

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The retention of zirconia-based ceramic posts (CosmoPost system) luted with glass ionomer and resin cements was evaluated. Thirtytwo extracted, caries-free, unrestored teeth were selected and stored in chlorhexidine and water solution. The teeth were endodontically treated and randomly assigned to two groups (n=16). Each tooth was decoronated and prepared to a depth of 10.0 mm from root surface to receive a 1.4 mm diameter zirconium dioxide post. Each group had posts cemented with either glass ionomer cement (Fuji I) or resin cement (Variolink II). The post/teeth specimens were embedded in resin blocks and subjected to tensile testing. The tensile force required to dislodge the cemented posts in a tensile testing machine was recorded. The mean stress values of both groups were analyzed for statistical differences using ANOVA and Student's t-test. Significance level was set at 5%. Mean peak forces at failure (N) and standard deviation for the tested cements were the following: Fuji I = 121.8 (±17.4) and Variolink II = 228.1 (±36.8). Posts luted with the resin cement presented statistically significant higher tensile bond strength than those retained with glass ionomer (p<0.05). It may be concluded that zirconia posts cemented with resin-based cement (Variolink II) failed at statistically significant higher values compared to those cemented with glass ionomer cement (Fuji I). Regardless of the cement type, the posts failed adhesively at the cement/post interface when subjected to a tensile force.

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Section: Introductionmentioning

confidence: 99%

In vitro evaluation of the retention of zirconia-based ceramic posts luted with glass ionomer and resin cements

et al. 2005

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“…While custom‐cast tapered posts and cores are traditionally used to restore endontically treated teeth, prefabricated posts have become very popular ( Torbjorner, Karlsson & Odman, 1995). Over the years, various prefabricated post systems have been introduced and successfully used in clinical settings ( Greenfeld et al ., 1989 ; Cohen et al ., 1995 ).…”

Section: Introductionmentioning

confidence: 99%

Effect of prefabricated metal post‐head design on the retention of various core materials

Zalkind

Shkury²,

Stern³

2000

J of Oral Rehabilitation

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Retention of various post heads to core restorative materials is an important factor in the selection of prefabricated post systems and restorative materials for the restoration of endodontically treated teeth. This study examines the retention of a post-core prefabricated system in relation to core material and post-head design. A total of 60 samples were prepared using two different post systems (ParaPost Plus (PP) and ParaPost Unity (PU), with amalgam, composite or glass-ionomer as one of the core materials. The samples were tested using the Instron testing machine. The PP was superior to the PU prefabricated post with respect to the retention of various core materials. Retention values in descending order of magnitude were found to be: composite, amalgam and glass-ionomer (significantly lower). The rhomboid serrated design of PP was superior in retention to the rounded smooth UP system. Composite material proved to be superior in retention, closely followed by amalgam, with glass-ionomer significantly less retentive.

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“…The spilt shank may provide a stress breaking function by collapsing during the development of threaded post space and minimizing hydrostatic backpressure during insertion [11]. The improved failure rate could also be related to the minimal thread penetration into the dentin.…”

Section: Discussionmentioning

confidence: 99%

Spontaneous Subdural Hematoma Secondary to Warfarin Toxicity in a Case with Deep Vein Thrombosis and Pulmonary Embolism

2010

IJEM

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Aim: The purpose of this study was to evaluate the fracture resistance and the mode of failure of endodontically treated teeth with five different post and core systems. A full coverage metal crown was fabricated and cemented onto each tooth. Each specimen was subjected to compressive load at a 130-degree angle to its axis until fracture. The failure load was recorded and compared statistically. The mode of failure of the specimens was analyzed. Results: Cast post and core showed the highest fracture threshold and Titanium post showed the lowest fracture threshold. Cast post and core and titanium post showed evidence of root fracture, which comes under unfavorable fractures. Carbon fiber, Luscent Anchor and Stainless Steel spilt shank post showed either core fracture or a coronal tooth fracture, which comes under favorable fracture, which are restorable. Conclusion: Groups, which have modulus of elasticity close to that of dentin like Carbon fiber post, Luscent Anchor post produced favorable tooth fractures, which are restorable.

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A comparison of two post systems under applied compressive-shear loads

Cited by 48 publications

References 30 publications

In vitro evaluation of the retention of zirconia-based ceramic posts luted with glass ionomer and resin cements

In vitro evaluation of the retention of zirconia-based ceramic posts luted with glass ionomer and resin cements

Effect of prefabricated metal post‐head design on the retention of various core materials

Spontaneous Subdural Hematoma Secondary to Warfarin Toxicity in a Case with Deep Vein Thrombosis and Pulmonary Embolism

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