Influence of remaining coronal structure and finish line on the fracture strength of roots restored with metallic posts

Carlini-Jr, Bruno; Cecchin, Doglas; Pereira, Gisele Damiana da Silveira; Paulillo, Luís Alexandre Maffei Sartini

doi:10.1590/s1806-83242011000400011

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…On the other hand, although our results did not confirm the effectiveness of LuxaCore as a material of a better biomechanical behavior than the others in the reconstruction of teeth with coronal destruction and no significant differences were observed among the failure mode rates of the experimental groups, we can suggest its use for fiber post cementation and core build‐up in a 1‐step for reducing clinical time and technical steps, which is an advantage in the dental practice routine 6,35 . Conversely to some authors, 14,28,30,31 irreparable root fracture was the most common failure mode found in this study. In a systematic review of clinical studies, Marchionatti et al 12 observed a loss of post or post/crown/core retention were the most common reasons for failure when fiber post was used in the anterior teeth.…”

Section: Discussioncontrasting

confidence: 93%

“…30 Therefore, a 1.0 mm ferrule was established for all groups for the simulation of weakened teeth and non-ideal ferrule, achievement of a less favorable situation, and an easier observation among the core materials and techniques used. 4 Several authors 3,8,9,13,15,28,31 reported a minimum length of 2.0 mm complete ferrule (360-degree) increases the tooth fracture strength in comparison to a tooth with less or no ferrule. However, other authors 8,9 observed that 2.0 mm ferrules with palatal axial wall was as effective as a 360-degree ferrule (circumferential) in providing fracture resistance of restored endodontically treated anterior teeth.…”

Section: Discussionmentioning

confidence: 99%

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Fracture strength of teeth with coronal destruction after core build‐up restoration with bulk fill materials

Oliveira

Reis

Tanomaru‐Filho

et al. 2021

J Esthet Restor Dent

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Objective This study aimed to evaluate the fracture strength and failure modes of different core techniques in teeth with simulated coronal destruction. Materials and methods Forty teeth were endodontically prepared and the specimens were divided into four experimental groups (n = 10) according to the core composition: Filtek One Bulk Fill‐FOBF, Filtek Z350 XT‐FZ350 (standard group), Filtek Bulk Fill Flow‐FBFF, and LuxaCore Z‐LCZ. CAD/CAM Monolithic zirconia crowns were obtained and cemented with RelyX U200. After storage in distilled water at 37°C for 48 h, the specimens were subjected to thermal cycling and to compressive strength mechanical tests. Statistical analyses (α = 0.05) were performed by non‐parametric Kruskal–Wallis, Dunn post hoc, and Fisher's exact tests. Results No significant differences (p > 0.05) were observed among FOBF, FZ350, and FBFF (mean ranks = 20.30, 12.20, and 23.20, respectively). LCZ (mean rank = 26.30) produced results similar to those of FOBF and FBFF (p > 0.05) and higher than those of FZ350 (p = 0.042). The most frequent type of failure was irreparable, regardless of the experimental condition. The lowest percentages of reparable fractures were produced by FOBF group (10%). Conclusions The use of bulk fill materials, including the “core‐and‐post” LCZ dual‐cure resin composite, did not impair the fracture strength of endodontically treated teeth with coronal destruction. Clinical significance Resin composite bulk fill materials that can be used as a core‐and‐post cementation in an only stage are interesting, since they enable clinicians to work with one only material, and avoid several materials interfaces, technical sensitivity, and longer chair‐time due to multistep procedures.

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Section: Discussioncontrasting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Fracture strength of teeth with coronal destruction after core build‐up restoration with bulk fill materials

Oliveira

Reis

Tanomaru‐Filho

et al. 2021

J Esthet Restor Dent

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“…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%

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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“…Numerous tests are available for evaluating the mechanical properties of posts and cores [15][16][17][18] . In the present study, static fracture load test was performed to compare the mechanical stability of endocrowns and post-cores.…”

Section: Discussionmentioning

confidence: 99%

Fracture load of ceramic crowns supported by some novel anchoring dental systems

Nagaş¹,

Nagaş²,

Eğilmez³

et al. 2017

Acta Odontologica Turcica

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OBJECTIVE: This study aimed to evaluate the fracture load of endocrown restorations and fiber-reinforced composites (FRCs) fabricated through computer-aided design/ computer-aided manufacturing (CAD-CAM) for postcores of anterior teeth. MATERIALS AND METHOD: Forty post-core-supported crowns and endocrowns were fabricated through CAD-CAM on a canine root zirconia model (Ice Zirconia, ZirkonZahn GmBH, Bruneck, Italy). The static load-bearing capacity was measured on the following restoration groups: Group 1: zirconia crown (Prettau anterior, ZirkonZahn GmBH) retained with CAD-CAM one-piece FRC post-core crown system (experimental CAD-CAM FRC block); Group 2: zirconia crown (Prettau anterior) retained with FRC post (GC Corp., Tokyo, Japan) with discontinuous fiber composite (EverX posterior, GC Corp) core; Group 3: zirconia endocrown (Prettau anterior); and Group 4: lithium disilicate ceramic endocrown (IPS e.max CAD, Ivoclar Vivadent AG, Schaan, Liechtenstein) (n = 10/per group). After the adhesive cementation of crowns/endocrowns to the zirconia root model, a load was applied at 45° to the long axis of the teeth and measured using a universal testing machine. The fracture modes were visually examined. The statistical analyses were performed using one-way ANOVA and Tukey post-hoc tests (p < 0.05). RESULTS: The fracture load significantly differed among the groups (p < 0.05) and was ranked as follows: Group 3 (1168 ± 141 N) > Group 4 (721 ± 96 N) ≥ Group 1 (680 ± 86 N) > Group 2 (534 ± 36 N). CONCLUSION: Endocrown monoblock restorations can be used as an alternative to fiber-reinforced post-core supported crown restorations.

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Influence of remaining coronal structure and finish line on the fracture strength of roots restored with metallic posts

Cited by 6 publications

References 12 publications

Fracture strength of teeth with coronal destruction after core build‐up restoration with bulk fill materials

Fracture strength of teeth with coronal destruction after core build‐up restoration with bulk fill materials

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

Fracture load of ceramic crowns supported by some novel anchoring dental systems

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