Influence of Cyclic Loading on Fiber Post and Composite Resin Core

Nishimura, Yasushi; Tsubota, Yuji; Fukushima, Shunji

doi:10.4012/dmj.27.356

Cited by 17 publications

(13 citation statements)

References 16 publications

(23 reference statements)

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“…44 The durability of the marginal fit of fiber post and composite resin core-restored ETT significantly decreased with cyclic loading. 45 The fracture modes observed in group 4 did indicate, besides a fatigue behavior of the ceramic material initially, a debonding failure of the crown impaired by the TML.…”

Section: Discussionmentioning

confidence: 99%

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Sterzenbach¹,

Rosentritt²,

Frankenberger³

et al. 2012

Operative Dentistry

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SUMMARY Objective The load capability of post-restored endodontically treated teeth (ETT) can be determined at different restorative stages. It was the aim of this study to compare the load capability of ETT at these stages. Materials and Methods Maxillary central incisors were divided into 4 groups (n=10) and endodontically treated. Specimens were restored with: (I) only glass fiber posts (GFP); (II) GFP and composite build-up with 2 mm ferrule; (III and IV) with additional adhesively luted all-ceramic crowns. Group (I) to (III) were statically loaded, and group (IV) was exposed to thermomechanical loading (TML) and subsequent static loading. Results The lowest median load level of 73 N was determined for group (I). The maximum median load value of 331 N was found for group (III). The comparison of Fmax [N] of group (I), (II) and (III) revealed significant differences between the groups (p<0.001). The specimens of group (IV) failed at significantly lower load values (p<0.005) as similarly restored specimens of group (III) which were only statically loaded. The stage of restoration and TML loading prior to static loading had a significant impact on fracture patterns (p=0.006). Conclusion Every additional restorative step torwards a final crown-restored ETT significantly increased the load capability. TML prior to load-to-fracture testing of the complete restorative complex, ie. post, core and crown, significantly decreased maximum load capability.

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Section: Discussionmentioning

confidence: 99%

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Sterzenbach¹,

Rosentritt²,

Frankenberger³

et al. 2012

Operative Dentistry

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“…As a result, metal is being replaced by composite resin in core build-up 2,10,17) , and particularly so This paper was originally a thesis submitted to the Graduate School of Tokyo Dental College in March 2014 by Otoaki Miho.…”

Section: Introductionmentioning

confidence: 99%

Grinding Efficiency of Abutment Tooth with Both Dentin and Core Composite Resin on Axial Plane

Miho

Satô

Mutoh

2015

Bull. Tokyo Dent. Coll.

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The purpose of this study was to evaluate grinding efficiency in abutment teeth comprising both dentin and core composite resin in the axial plane. Grinding was performed over 5 runs at two loads (0.5 or 0.25 N) and two feed rates (1 or 2 mm/sec). The grinding surface was observed with a 3-D laser microscope. Tomographic images of the grinding surfaces captured perpendicular to the feed direction were also analyzed. Using a non-ground surface as a reference, areas comprising only dentin, both dentin and core composite resin, or only core composite resin were analyzed to determine the angle of the grinding surface. Composite resins were subjected to the Vickers hardness test and scanning electron microscopy. Data were statistically analyzed using a one-way analysis of variance and multiple comparison tests. Multiple regression analysis was performed for load, feed rate, and Vickers hardness of the build-up material depending on number of runs. When grinding was performed at a constant load and feed rate, a greater grinding angle was observed in areas comprising both dentin and composite resin or only composite resin than in areas consisting of dentin alone. A correlation was found between machinability and load or feed rate in areas comprising both dentin and composite resin or composite resin alone, with a particularly high correlation being observed between machinability and load. These results suggest that great caution should be exercised in a clinical setting when the boundary between the dentin and composite resin is to be ground, as the angle of the grinding surface changes when the rotating diamond point begins grinding the composite resin.

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“…However, various studies that assess bond strength between root canal posts and dentin after mechanical fatigue do not simulate periodontal ligament 3 , 8 . Similarly, most studies fail to simulate the periodontal ligament in fracture resistance tests 5 , 18 , although a few studies simulate the periodontal ligament using polyether 11 , 13 and polivynilsiloxane based elastomers 7 , 22 .…”

Section: Introductionmentioning

confidence: 99%

Influence of periodontal ligament simulation on bond strength and fracture resistance of roots restored with fiber posts

et al. 2014

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ObjectiveConsidering that periodontal ligament simulation may influence the stress distribution over teeth restored with intraradicular retainers, this study aimed to assess the combined effect of mechanical cycling and periodontal ligament simulation on both the bond strength between fiber posts and root dentin and the fracture resistance of teeth restored using glass fiber posts.Material and MethodsNinety roots were randomly distributed into 3 groups (n=10) (C-MC: control; P-MC: polyether; AS-MC: addition silicone) to test bond strength and 6 groups (n=10) (C: control; P: polyether; AS: addition silicone, without mechanical cycling, and C-MC, P-MC and AS-MC with mechanical cycling) to test fracture strength, according to the material used to simulate the periodontal ligament. For the bond strength test, fiber posts were cemented, cores were built, mechanical cycling was applied (2×106 cycles, 88 N, 2.2 Hz, and 45º incline), and the teeth cut into 3 slices (2 mm), which were then subjected to the push-out test at 1 mm/min. For the fracture strength test, fiber posts were cemented, cores were built, and half of the groups received mechanical cycling, followed by the compressive strength (45° to the long axis and 1 mm/min) performed on all groups.ResultsPeriodontal ligament simulation did not affect the bond strength (p=0.244) between post and dentin. Simulation of periodontal ligament (p=0.153) and application of mechanical cycling (p=0.97) did not affect fracture resistance.ConclusionsThe materials used to simulate the periodontal ligament did not affect fracture or bond strength, therefore periodontal ligament simulation using the tested materials could be considered optional in the conditions of the study.

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Influence of Cyclic Loading on Fiber Post and Composite Resin Core

Cited by 17 publications

References 16 publications

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Grinding Efficiency of Abutment Tooth with Both Dentin and Core Composite Resin on Axial Plane

Influence of periodontal ligament simulation on bond strength and fracture resistance of roots restored with fiber posts

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