Comparison of the torsional forces at failure for seven endodontic post systems

Cohen, Beverly S.; Pagnillo, Mark K.; Condos, Spyridon; Deutsch, Allan S.

doi:10.1016/s0022-3913(05)80373-7

Cited by 23 publications

(12 citation statements)

References 21 publications

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“…The retention of silver amalgam was slightly less than that of composite, while that of the glass–ionomer was significantly lower than that of the other two materials. Other researchers reported similar results ( Volwiler et al ., 1989 ; Chang & Millstein, 1993; Cohen et al , 1995 ). It has been reported that silver amalgam retain slightly more strongly to the post head than composite ( Chang & Millstein, 1993).…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…Many methods and techniques for post‐and‐core construction are available. The characteristics of each system are determined by the post‐and‐core design ( Greenfeld et al , 1989 ; Kahn, 1991; Cohen et al , 1995 ). Post heads are either flat, spherical, or serrated, and the most commonly used core materials are silver amalgam, composite and glass–ionomer cement ( Volwiler, Nicols & Harrington, 1989; Chang & Millstein, 1993; Kahn et al ., 1996 ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Single implant-supported restorations can also be subject to rotational or torsion forces, whenever they are clinically demanded through the functional contacts cusp/marginal ridge, that is, in a one tooth to two teeth relation (Cohen et al, 1995). Figure 27 shows tensile stresses between 50 and 300 MPa on the abutment, which was already expected, in view of the direction of the force on the crown, which pulls the implant in this area.…”

Section: Torsion Effect -Load Of 45˚ On the Mesial Marginal Ridgementioning

confidence: 90%

Stress distribution in implant-supported restorations under different simulated loads

Ventura¹,

Poiate²,

Poiate³

et al. 2012

Finite Element Analysis - From Biomedical Applications to Industrial Developments

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“…A post is commonly placed in an attempt to strengthen the tooth (1,2). However, in vitro and in vivo studies have demonstrated that a dowel does not reinforce endodontically treated teeth, in spite of improving retention when little amount of clinical crown is remaining (3)(4).…”

Section: Introductionmentioning

confidence: 99%

Influence of the remaining coronal structure on the resistance of teeth with intraradicular retainer

et al. 2005

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The aim of this study was to compare the resistance of endodontically treated teeth with intraradicular retainer different amounts of remaining coronal structure. Fifty freshly extracted maxillary canines were endodontically treated and randomly assigned to five groups (n=10), as follows: group 1 (control) = teeth with custom cast post and core; group 2 = teeth without remaining coronal structure; group 3, 4 and 5 = teeth with 1 mm, 2 mm and 3 mm of remaining coronal structure, respectively. All specimens in groups 2 to 5 were restored with prefabricated post and resin core. The teeth were embedded in acrylic resin and the fracture strength was measured on a universal testing machine at 45 degrees to the long axis of the tooth until failure. Data were analyzed statistically by one-way analysis of variance and Tukey's test. There was no significant differences (p>0.05) between the control group and group 2, and between groups 3, 4 and 5 (p>0.05). Control group and group 2 had significantly higher resistance strength than groups 3, 4 and 5 (p<0.00001). The findings of this study showed that teeth without remaining coronal structure had significantly higher fracture strength than those with remaining coronal structure (1 mm, 2 mm and 3 mm). When the dental crown was not completely removed, the amount of remaining coronal dentin did not significantly affect the fracture strength of endodontically treated teeth with intraradicular retainer.

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Comparison of the torsional forces at failure for seven endodontic post systems

Cited by 23 publications

References 21 publications

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

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

Stress distribution in implant-supported restorations under different simulated loads

Influence of the remaining coronal structure on the resistance of teeth with intraradicular retainer

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