Influence of endodontic posts on the fracture behavior of crowned premolars with class II cavities

Nothdurft, Frank P.; Seidel, E.; Gebhart, Florian; Naumann, Michael; Motter, P.J.; Pospiech, Peter

doi:10.1016/j.jdent.2008.01.007

Cited by 18 publications

(20 citation statements)

References 21 publications

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“…Dynamic and static loading were performed at an angle of 45° to the long-axis of the roots to simulate a clinical situation, which represents a biomechanical "worst case scenario". This is also in accordance with published reports about post and core fracture and fatigue testing of endodontically treated teeth 21,32) . Fatigue studies have shown the influence of post properties on the restoration behaviour and indicated that posts, which exhibit physical properties close to dentin allow minimization of the incidence of adhesive failures or specimen fractures [32][33][34] .…”

Section: Discussionsupporting

confidence: 93%

“…Recent studies indicated, that the maximum resistance to fracture of endodontically treated teeth with minor loss of hard tissue is provided by the circular covering crown and that it cannot be raised by additional placement of any kind of post 21) . Regarding severely damaged teeth, no differences in the load bearing capabilities could be found between rigid and flexible posts 22) .…”

Section: Introductionmentioning

confidence: 99%

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Influence of fatigue testing and cementation mode on the load-bearing capability of bovine incisors restored with crowns and FRC posts

et al. 2011

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The aim of the study was to evaluate the influence of fatigue and cementation mode on the fracture behaviour of endodontically treated bovine incisors restored with fiber-reinforced-composite (FRC) posts and crowns. Forty-eight endodontically treated incisors were restored with FRC posts, composite build-ups, and cast crowns. In 16 teeth, each of the posts were cemented conventionally with KetacCem (3M Espe) or adhesively with Panavia F (Kuraray) or RelyXUniCem (3M Espe). One-half of the specimens in each group were subjected to thermal cycling with 10,000 cycles at 5-55°C and mechanical aging, loading the specimens in 1,200,000 cycles with 50 N. Fracture resistance was determined by loading the specimens until fracture at an angle of 45°. The loading test showed that cementation mode and fatigue testing had an influence on the load bearing capability. Before fatigue testing no statistically significant differences between the different cementation modes could be detected. After fatigue testing, conventionally cemented FRC posts lead to statistically significant higher fracture loads compared to adhesively luted posts. Most specimens fractured in a favourable way, independent from the type of cementation.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Influence of fatigue testing and cementation mode on the load-bearing capability of bovine incisors restored with crowns and FRC posts

et al. 2011

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“…Fracture strength The fracture strength of zirconia posts was evaluated using natural teeth in 15 studies 12,14,33,39,[41][42][43]48,49,51,55,58,[60][61][62] ( Table 1) and artificial roots in three studies 29,53,59) , and according to core material (composite resin core versus ceramic core) in nine studies 35,40,[44][45][46][47]52,54,57) (Table 2). Table 1 shows that the fracture strengths of teeth with zirconia posts and composite cores ranged between 300 N and 700 N. However, when ceramic cores were used, these values ranged between 800 N and 1500 N. These results concurred with studies which evaluated the fracture strength of zirconia posts according to core material 35,40,44,45,54) .…”

Section: Resultsmentioning

confidence: 99%

“…Akkayan 14) reported that increasing the ferrule length enhanced the fracture strength and that 2-mm ferrule was a rational clinical guideline. Table 1 shows the ferrule lengths of the natural teeth tested in the reviewed studies, whereby fracture strength ranged between 320 N and 780 N with no ferrule 12,48,49,58) , but between 350 N and 1500 N with 2-mm ferrule 14,39,42,43,51) . With artificial roots, lower fracture strength values were obtained because they reduced the effect of structural differences between natural teeth and the posts 29,53,59) .…”

Section: Resultsmentioning

confidence: 99%

Zirconia ceramic post systems: a literature review and a case report

2010

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Cast metal post-core systems have a long history of successful use because of their superior physical properties. However, their high elastic modulus can cause stress concentrations within the surrounding radicular dentin, resulting in root fractures. Moreover, the increasing demand for more esthetically appealing and biocompatible restorations has led to the development of tooth-colored, translucent, metal-free post-core systems. Notably, prefabricated zirconia ceramic post systems have been introduced to satisfy this trend toward a heightened awareness of esthetics, whereby the translucency of all-ceramic crowns can be successfully maintained with the use of ceramic post-core materials. Owing to the keen interest in and widespread use of zirconia ceramic post systems, many in vitro studies on zirconia posts have been published in the last 15 years. The aim of this article was to present data about the retention, fracture resistance, microleakage, light transmission, esthetic advantages, and radiodensity of zirconia posts. Two clinical survival rate studies were also presented. Based on the results of these studies, zirconia posts have been shown to improve the esthetic quality of all ceramic crowns and thus their usage is recommended. Apart from literature review, a case report in which a fractured fiber post was replaced with a custom-made zirconia post was also presented.

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“…34 Mechanical aging was applied with a universal testing machine using a stainless steel spherical antagonist (with tip 3 mm in diameter) contacting on the lingual surface, 2 mm below the incisal edge of the crowns. A 45-degree oblique load of 49.0 6 0.7 N was applied in 60,000 cycles with a crosshead speed of 10 mm/s downward and 70 mm/s upward.…”

Section: Thermomechanical Agingmentioning

confidence: 99%

Effects of Auxiliary Fiber Posts on Endodontically Treated Teeth With Flared Canals

Li¹,

Xu²,

Wang³

et al. 2011

Operative Dentistry

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Macro-Lock post combined with auxiliary fiber posts could increase the fracture resistance of endodontically treated roots with over-flared canals. However, an effect of the auxiliary fibers on retention strength was not observed. SUMMARYThis study investigated the fracture resistance and retention of endodontically treated roots with over-flared canals restored with different post systems, including one cast metal post and four fiber posts with/without auxiliary fiber posts. One hundred endodontically treated incisor roots were experimentally flared using a tapered diamond bur. The roots were restored using one of the five post systems: Ni-Cr cast metal post (CM), D.T. Light glass fiber post (DT), Macro-Lock glass fiber post (ML), ML+2 Fibercone auxiliary fiber posts (2FC), and ML+5 Fibercone auxiliary fiber posts (5FC). After fabrication of the crowns, half of the specimens (n¼50) were subjected to a fracture failure test-loading with an incremental static force at an angle of 45 degrees to the long axis of the root. The other 50 samples underwent a pull-out test. Fracture failure strength and pull-out strength were measured and analyzed using one-way analysis of variance (ANOVA) followed by Tukey's post hoc test (a¼0.05). After the tests were completed, all specimens displayed oblique root fractures or cracks, initiating from the palatal cervical margin and propagating in a labial-apical direction. The order of the fracture failure strength was as follows: 5FC¼CM¼2FC. ML.DT. Cast metal posts demonstrated the highest pull-out strength (p,0.05). No significant differences in pull-out strength were found in the ML, 2FC, and 5FC groups. Within the limitations of this study, it was concluded

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Influence of endodontic posts on the fracture behavior of crowned premolars with class II cavities

Cited by 18 publications

References 21 publications

Influence of fatigue testing and cementation mode on the load-bearing capability of bovine incisors restored with crowns and FRC posts

Influence of fatigue testing and cementation mode on the load-bearing capability of bovine incisors restored with crowns and FRC posts

Zirconia ceramic post systems: a literature review and a case report

Effects of Auxiliary Fiber Posts on Endodontically Treated Teeth With Flared Canals

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