The effect of post, core, crown type, and ferrule presence on the biomechanical behavior of endodontically treated bovine anterior teeth

Silva, Natércia Rezende da; Raposo, L.; Versluis, Antheunis; Fernandes-Neto, Alfredo Júlio; Soares, Carlos José

doi:10.1016/s0022-3913(10)60146-1

Cited by 104 publications

(121 citation statements)

References 37 publications

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“…Finite element analysis shows that the ferrule effect attenuates stress intensity on the root when either metal or fiber posts are used [12][13][14][15] . Previous studies also did not find a difference in fracture resistance between teeth restored with crowns and cast and post cores or fiber posts when a ferrule was present 13,16,17 . As long as there is ferrule presence, the effect of the stiffness of the post system is secondary for the mechanical behavior of endodontically treated teeth 16 , thus the difference between the elastic modulus of the post materials was minimized by the ferrule.…”

Section: Discussionmentioning

confidence: 79%

“…Previous studies also did not find a difference in fracture resistance between teeth restored with crowns and cast and post cores or fiber posts when a ferrule was present 13,16,17 . As long as there is ferrule presence, the effect of the stiffness of the post system is secondary for the mechanical behavior of endodontically treated teeth 16 , thus the difference between the elastic modulus of the post materials was minimized by the ferrule. Figure 2 shows a representation of the bending moments on the post.…”

Section: Discussionmentioning

confidence: 79%

“…with possibility of re-intervention and preservation of the tooth 4 . These findings may also be associated with the presence of a ferrule, which has a protective effect since it improves the mechanical behavior of pulpless teeth by reducing cervical stress level on the restored root 14,16 . Other studies have shown that the ferrule effect provided by remaining dentin is associated with restorable failure modes [20][21][22] .…”

Section: Discussionmentioning

confidence: 99%

“…Displacement measurement associated with mechanical tests and failure mode analysis contributes to a better understanding of the behavior of the restorative complex during loading 13,16 . Teeth are submitted to stress concentration and strain under load application.…”

Section: Discussionmentioning

confidence: 99%

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Influence of elastic modulus of intraradicular posts on the fracture load of roots restored with full crowns

Marchionatti

Valli

Wandscher

et al. 2017

Rev. odontol. UNESP

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Objective This study aimed to evaluate the fracture load and displacement of roots restored with posts of different elastic modulus. Material and method Thirty-six replicas of epoxy resin mixed with glass microfibers were made from an endodontically-treated human premolar root prepared to a length of 12 mm with a custom drill, leaving the apical 4 mm unprepared. Replicas were randomly restored with (n = 12): FP-LM (fiber post with low elastic modulus– 50 GPa), FP-HM (fiber post with high elastic modulus – 67 GPa) and MP (metallic post – 208 GPa), using self-curing adhesive and dual resin cement. Cores were built up with composite resin and metallic crowns were cemented in all the roots with self-adhesive resin cement with self-curing mode. Specimens were subjected to a fracture load test (45° inclination/0.5 mm/min) and displacement was registered at 100 N. Result One-way ANOVA showed that elastic modulus of the post did not affect the fracture load means (p = 0.203) (FP-LM: 237.4 ± 65.11 N; FP-HM: 236.7 ± 92.85 N; MP: 295.8 ± 108.7 N) but was statistically significant for the displacement (p < 0.00): Tukey’s test showed that FP-LM displacement mean (0.81 ± 0.15 mm) was significantly higher than those for FP-HM (0.46 ± 0.26 mm; p = 0.00) and MP (0.62 ± 0.07 mm; p = 0.04). Conclusion Posts with different elastic modulus exhibit similar fracture loads, but a lower displacement is achieved when fiber posts with a high elastic modulus and metallic posts are used.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of elastic modulus of intraradicular posts on the fracture load of roots restored with full crowns

Marchionatti

Valli

Wandscher

et al. 2017

Rev. odontol. UNESP

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“…[1][2][3][4][5] The likelihood of a pulpless tooth surviving is directly related to the quantity and quality of remaining tissue. [5][6][7][8] Posts may interfere with the mechanical resistance of teeth, thus increasing the risk of damage to the residual tooth structure. [9][10][11] The main purpose of a post is to provide retention for the core foundation, when there is an insufficient remaining clinical crown.…”

Section: Introductionmentioning

confidence: 99%

Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

et al. 2013

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The aim of this study was to evaluate the effect of parallel and tapered threaded post placement on the strain and stress distribution of endodontically treated teeth. Fifteen bovine incisors were sectioned 15 mm from their apices, endodontically treated, and divided into three groups (n = 5) according to three different threaded posts: parallel threaded post (Radix-Anker, RA); tapered threaded post (Euro-Post, EP) and tapered threaded post (Reforpost II, RII). A strain-gauge was fixed on the proximal surface perpendicular to the long root axis, 2 mm from the cervical limit. Strain generated during post placement was recorded and compared using one-way ANOVA and Tukey's test (α = .05). A scanning electron microscope was used to examine the longitudinal root sections. Stress was evaluated for each group in a two-dimensional finite element analysis. The models were meshed with tetrahedron elements and loaded with 2 N at an angle of 135° to the lingual face. The equivalent Von Mises stress was calculated. The one-way ANOVA showed significant difference among the groups. The RA group (150.0 ± 12.2 A) produced higher external strain than the RII (80.0 ± 12.2 B) and the EP (70.0 ± 6.1 B) groups. The inner strain was approximately five times greater than the external dentin strain. High stress concentrations in each thread of the posts were observed. Scanning electron micrographs showed cracks that started in the threads of the posts. The threaded post placement induced root strain mainly on the parallel side post. Root strain and stress concentration on the post threads tended to create cracks in the inner root canal dentin.

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Evaluation of Er,Cr:YSGG laser technique for fiber post removal of endodontically treated teeth using micro‐computed tomography

Papoulidou,

Dionysopoulos,

Mourouzis

et al. 2023

Microscopy Res & Technique

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Various clinical techniques such as removal kits, ultrasonic tips, burs, and drills, have been used for fiber post removal in endodontically treated teeth. In most clinical cases, the dental practitioners prefer to use ultrasonic tips, despite the heat generation and the formation of microcracks induced in the radicular dentin. The purpose of this study was to investigate the effectiveness of using erbium, chromium: yttriumscandium-gallium-garnet (Er,Cr:YSGG) laser (2780 nm) as an alternative fiber post removal technique and to compare it to an ultrasonic method using micro-computed tomography (micro-CT). The operating parameters of the X-ray tube were set to 50 kVp and 300 mA. This approach allowed the generation of 2D lateral projections that were then used to reconstruct the 3D volume in DICOM format. Fiber posts were removed from 20 endodontically treated single-rooted premolars (n = 10) using an ultrasonic vibrator with diamond-coated ultrasonic tip (control method), or Er,Cr: YSGG laser irradiation protocol; average power 2.5 W, repetition rate 20 Hz, pulse duration 140 μs, 40% air and 20% water, and close-contact mode. The number of sections with newly formed microcracks, the loss of dentinal tissue, the amount of the residual resin cement, and the removal time were evaluated for both methods.The data were analyzed using paired t-test, Wilcoxon signed-rank and Mann-Whitney U tests at level of significance a = .05. In the laser-treated group the parameters regarding microcracks formation (21 ± 16) and removal time (4.7 ± 1.1 min) were advantageous compared to the ultrasonic-treated group (42 ± 27 and 9.2 ± 1.0 min, respectively), indicating that Er,Cr:YSGG laser could be an alternative fiber post removal technique.

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The effect of post, core, crown type, and ferrule presence on the biomechanical behavior of endodontically treated bovine anterior teeth

Cited by 104 publications

References 37 publications

Influence of elastic modulus of intraradicular posts on the fracture load of roots restored with full crowns

Influence of elastic modulus of intraradicular posts on the fracture load of roots restored with full crowns

Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

Evaluation of Er,Cr:YSGG laser technique for fiber post removal of endodontically treated teeth using micro‐computed tomography

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