Influence of Ferrule, Post System, and Length on Biomechanical Behavior of Endodontically Treated Anterior Teeth

Santos-Filho, Paulo César Freitas; Veríssimo, Crisnicaw; Soares, Paulo Vinícius; Saltarelo, Rebeca Carniello; Soares, Carlos José; Martins, Luís Roberto Marcondes

doi:10.1016/j.joen.2013.09.034

Cited by 113 publications

(130 citation statements)

References 37 publications

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“…Glass fiber posts are less rigid and present mechanical properties similar to dentin, creating a homogeneous assembly within the root (4) with better stress distribution than metallic posts (5). In addition, the contact of metallic posts with interstitial fluids results in electrochemical reactions (1) as well as posts more rigid than dentin increase the risk of stress concentration in the apical region of the tooth, which cause a high incidence of irreparable fractures in restored teeth (5).…”

Section: Introductionmentioning

confidence: 99%

Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques

et al. 2016

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This study evaluated the fracture strength of endodontically treated teeth submitted to reconstructive techniques through dynamic and static tests. Forty human anterior teeth were divided into 4 groups (n=10): GNW (non-weakened) -root restored with glass fiber post (GFP), GW -weakened root restored with GFP, GDA -weakened root restored with direct anatomic GFP, and GIA -weakened root restored with indirect anatomic GFP. The teeth were endodontically treated considering that experimental groups (GW, GDA and GIA) simulated weakened roots for restoration with GFP using different techniques. The GFP was luted with resin cement and the coronal portion was restored with composite resin and metallic crowns. All samples were submitted to chewing simulation at 60 cycles/ min in a total of 300,000 cycles. The survival samples were further exposed to compressive loading at a crosshead speed of 1.0 mm/min in a universal testing machine. The load was applied at 135° to the long axis of the tooth until failure. Data were analyzed by ANOVA (α=0.05). After chewing simulation were observed: GNW: 100% of survival roots; GW: 70% of survival roots, and GDA and GIA: 80% of survival roots. The mean fracture strength values (N) were 280.6 (GNW), 239.0 (GW), 221.3 (GDA), and 234.1 (GIA) without significant difference among the groups (p=0.7476). The results suggested similar fracture strength in both weakened and non-weakened teeth regardless the reconstructive technique of root internal wall. Higher incidence of catastrophic fracture was observed in weakened teeth without restoration of the root internal wall.

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Section: Introductionmentioning

confidence: 99%

Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques

et al. 2016

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“…The presence of a cervical ferrule positively affects the stress distribution pattern by reducing stress concentration on the root and risk of tooth fracture. 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 .…”

Section: Discussionmentioning

confidence: 99%

“…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: 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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“…Finite element analysis (FEA) has been suggested as an efficient method to simulate a real clinical scenario and solve complex problems by evaluations of inner structural performance (1,2). Thus, it has also been considered as an important method to foresee long-term failures (3).…”

Section: Introductionmentioning

confidence: 99%

Reliability of FEA on the Results of Mechanical Properties of Materials

et al. 2015

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The present study evaluated the reliability of FEA on the results of different mechanical properties (E and v) of materials. Two 3D models of a maxillary canine with endodontic treatment, intracanal post, composite resin core and restored with porcelain-fused-tometal crown were generated according to micro-CT images. Two groups with different E and ν values for porcelain, metal coping alloy, resin cement and composite resin were established. The materials' properties for group GL were based on literature data, while for group GIE the impulse excitation technique was used. A load of 180 N was applied at 45° on the incisal third of the lingual surface of the canine tooth. All models were supported by the periodontal ligament (x=y=z=0). The von Mises stress (VMS) was calculated. The stress values revealed differences between the groups for both VMS distribution and value. The porcelain (GL: 5.966 MPa; GIE: 7.478 MPa), metal coping (GL: 3.811 MPa; GIE: 0.973 MPa) and core (GL: 4.771 MPa; GIE: 0.026 MPa) were significantly affected. In conclusion, this study showed that the determination of mechanical properties (E and ν) of materials is essential for the reliability on the results of FEA.

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Influence of Ferrule, Post System, and Length on Biomechanical Behavior of Endodontically Treated Anterior Teeth

Cited by 113 publications

References 37 publications

Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques

Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques

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

Reliability of FEA on the Results of Mechanical Properties of Materials

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