Fracture resistance of weakened roots restored with relined or milled CAD-CAM glass fiber posts

Maia, Belizane das Graças Oliveira; Santos, Thaís da Silva Alves; Carvalho, Cláudio Antônio Talge; Verner, Francielle Silvestre; Junqueira, Rafael Binato

doi:10.4012/dmj.2022-114

Dent. Mater. J.

2023

DOI: 10.4012/dmj.2022-114

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Fracture resistance of weakened roots restored with relined or milled CAD-CAM glass fiber posts

Belizane das Graças Oliveira Maia

Thaís da Silva Alves Santos

Cláudio Antônio Talge Carvalho

et al.

Abstract: This in vitro study compared the fracture resistance of weakened roots restored with milled or relined glass fiber post (GFP). Seventy bovine incisors were divided into seven groups, according to the weakening protocol (none: control; medium-weakened: MW; highlyweakened: HW) and post anatomization technique (non-relined, relined with Bulk Fill or Z350 resin; milled GFP: M). Roots were thermomechanical cycled and submitted to compression. Frequencies and groups were compared by the chi-square test and twofactor… Show more

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Cited by 3 publications

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“…There are studies in the literature comparing CAD/ CAM-fabricated custom post and core systems with fiber post and composite core structures. [9][10][11] However, in those studies, milling was used to fabricate test specimens rather than 3D printing. There is no study in the literature concerning the fracture resistance of 3Dprinted post and core systems.…”

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Evaluation of the Mechanical Properties of 3D-Printed Post and Core Systems

Çelik Öge,

Küden,

Ekren

2024

Int J Prosthodontics

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To evaluate and compare the fracture resistance and elastic modulus of 3D-printed post and core systems and fiber posts and composite cores. Materials and Methods: Endodontic treatment was performed on 30 mandibular premolars, and post space preparation was performed. The teeth were then randomly divided into two groups (n = 15 per group): the 3D-printed (3DP) group and the fiber post and composite core (FPC) group. In the FPC group, fiber posts (Cytec Blanco 43.604, Hahnenkratt) were bonded with resin cement (RelyX U200, 3M), and the composite core dimension was standardized with a silicone index. In the 3DP group, the impression of the post space for each specimen was taken with pattern resin (Pattern Resin, GC America), and the coronal core was produced with the same silicone index. The impressions of the posts and cores were scanned, and then the custom post and core structures were fabricated from permanent crown resin material (Permanent Crown Resin, Formlabs) with a 3D printer (Form3B, Formlabs). Specimens were subjected to load tests with a universal testing machine (M500-25AT, Testometric). After fracture occurred, the fracture force and elastic modulus were calculated. The data were analyzed by independent sample t test (α = .05) Results: There was no statistically significant difference between the two groups in terms of peak fracture force (P = .626) and elastic modulus (P = .125), and no catastrophic root fractures were observed in either group. Conclusions: The fracture resistance of endodontically treated teeth was not significantly influenced by the post material. 3D-printed, custom-made resin posts were as effective as fiber glass posts with regard to fracture resistance.

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mentioning

confidence: 99%

Evaluation of the Mechanical Properties of 3D-Printed Post and Core Systems

Çelik Öge,

Küden,

Ekren

2024

Int J Prosthodontics

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Are CAD-CAM milled glass fiber posts better than prefabricated or custom glass fiber posts for endodontically treated teeth? A systematic review with meta-analysis

Campos,

Pellizzer,

de Carvalho

et al. 2024

The Journal of Prosthetic Dentistry

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The Effect of Remaining Coronal Tissue Height on the Fracture Strength of Over-Flared Endodontically Treated Central Incisors Restored Using a Multipost Approach

Farshbaf-antik,

Abed-Kahnamouei,

Alizadeh-Oskoee

et al. 2023

International Journal of Dentistry

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Objectives. This study aimed to examine the effect of remaining coronal tissue height on the fracture strength of over-flared endodontically treated central incisors restored with multiple prefabricated fiberglass posts using the multipost approach. Materials and Methods. A total of 40 human central maxillary incisors were examined in this study. The samples were assigned to five groups (n = 8) based on the height of the remaining coronal tissue: with no remaining coronal tissue, 1-mm coronal tissue height (CTH1), 2-mm coronal tissue height, 3-mm coronal tissue height (CTH3), and one intact tooth (IT) group. Following endodontic treatment of an over-flared canal, the postspace depth was 10 mm, and the residual dentin thickness was 1 mm. Two prefabricated fiberglass posts were cemented into the root canal, adopting a multipost approach. The static load was applied at 0.5 mm/min and 135° concerning the tooth’s longitudinal axis until a fracture occurred. One-way analysis of variance and the post hoc Tukey’s test were performed to analyze the data at a significance level of p < 0.05 . Results. The maximum fracture strength was recorded for IT (control group), while the minimum fracture strength was found for teeth with a coronal tissue height of 1 mm. The differences between IT group and other groups ( p < 0.05 ), as well as the differences between the group with CTH3 and groups without coronal tissue and CTH1, were significant. Conclusion. In sum, an increase in the height of the remaining coronal tissue (≥3 mm) significantly increased the fracture strength of over-flared endodontically treated central incisors after restoration with prefabricated fiberglass posts by adopting a multipost approach.

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Fracture resistance of weakened roots restored with relined or milled CAD-CAM glass fiber posts

Cited by 3 publications

References 23 publications

Evaluation of the Mechanical Properties of 3D-Printed Post and Core Systems

Evaluation of the Mechanical Properties of 3D-Printed Post and Core Systems

Are CAD-CAM milled glass fiber posts better than prefabricated or custom glass fiber posts for endodontically treated teeth? A systematic review with meta-analysis

The Effect of Remaining Coronal Tissue Height on the Fracture Strength of Over-Flared Endodontically Treated Central Incisors Restored Using a Multipost Approach

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