Influence of elastic modulus mismatch between dentin and post-and-core on sequential bonding failure

Teshigawara, Daisuke; Ino, Teruo; Otsuka, Hidetoshi; Isogai, Tomonori; Fujisawa, Masanori

doi:10.1016/j.jpor.2018.12.003

Cited by 10 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The recent studies reported that the post materials showed no influence on the fracture strength [42] nor the mode of failure [43]. Nowadays, the most important factors are the ferrule presence [44] and the post bonding condition [45]. In a previous study, zirconia posts were recommended regarding their durable bond after ageing [46] and their favourable long-term clinical outcome [47].…”

Section: Discussionmentioning

confidence: 99%

Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing

et al. 2022

View full text Add to dashboard Cite

Purpose: To evaluate the effect of three different designs and two monolithic ceramic materials on the durability and fracture resistance of endocrowns on maxillary first premolars, in comparison to post-and-core crowns. Methods: Fifty-six maxillary premolars were endodontically treated and shortened to a level of 2 mm from the cervical line, and randomly categorized into six endocrown groups and post-and-core crown control group (n=8); E1; endocrowns with flat occlusal table (without ferrule), E2; endocrowns with 1.5 mm circumferential ferrule, E3; endocrowns with 1.5 mm buccal ferrule preparation. Two materials were used for endocrowns: zirconia (4YSZ; Z), and lithium disilicate (L). The control group was restored with zirconia posts, and lithium disilicate crowns. All restorations were bonded using Panavia V5 and its respective primers and underwent thermo-mechanical fatigue with a 10 kg dynamic load for 1,200,000 cycles and thermocycling between 5 and 55 °C. Thereafter all survived specimens were loaded to fracture. The results were statistically analyzed using ANOVA and T-Test. Results: None of the specimens showed any signs of debonding or fracture caused by the fatigue test. The PC control group showed no statistically significant difference in comparison to groups ZE1, ZE2 and LE2 ( p > 0.05 ). However, it was significantly different from groups LE1, LE3, and ZE3 ( p ≤ 0.05 ). Conclusions: Preparation designs and materials affected the fracture resistance of endocrowns. The results showed a superiority of the post-and-core crowns, zirconia/lithium disilicate endocrowns with 1.5 mm circumferential ferrule, and zirconia endocrowns with the flat occlusal table.

show abstract

Section: Discussionmentioning

confidence: 99%

Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing

et al. 2022

View full text Add to dashboard Cite

show abstract

“… 14- Teshigawara D. and al. (2019) 15 (Finite Element Analysis Studies) A dental model was created and then divided into 4517 sections using eight-noded hexahedral elements. Analyzing the failure processes of the cement in teeth restored with posts and determining how the elastic properties of the posts affect these failure processes.…”

Section: Resultsmentioning

confidence: 99%

Factors Influencing Vertical Radicular Fractures in Teeth Supported by Metallic Dental Core: A Scoping Review

Oulghazi,

El Yamani,

Morchad

2024

CCIDE

View full text Add to dashboard Cite

Purpose The aim of this work is to conduct a literature review to highlight all the parameters involved in sub-prosthetic radicular fractures of teeth supported by metallic dental core. Materials and Methods The following research was performed among published studies over the last 10 years in two PubMed/Medline and Scopus and supplemented by manual searching within the bibliographies. The search was restricted to publications in English and French. Results Out of the 1464 articles initially identified, 18 studies met our inclusion criteria and were subsequently included in the literature review. These consisted of eight Finite Element Analysis Studies, two Retrospective Studies and one Randomized Controlled Trial. The results of this review show that radicular fractures are influenced by several variables, including predisposition, with maxillary premolars and mandibular molars being the most commonly affected teeth. Intracanal preparation can induce crack formation, leading to localized high stress concentrations. Increased ferrule height to 2 mm significantly enhances dental fracture resistance. Using high modulus of elasticity alloys results in nearly complete stress transmission to dentin due to their limited deformability and absorption capacity. The highest fracture resistance is achieved when posts are sealed using resin-modified glass-ionomer cement. Longer posts may be preferable to prevent vertical fractures. Additionally, occlusal factors, through repetitive stresses, contribute to crack propagation from surface defects, a phenomenon termed fatigue fracture. Conclusion These findings have significant implications. Practitioners should be aware of the predisposition of certain teeth, the importance of preserving the ferrule effect, the choice of root post materials, post Cement Material and the role of occlusal forces in managing and preventing vertical root fractures.

show abstract

“…In addition, the tooth model restored with the GF-reinforced V-fa/ECO biocopolymer post showed lower value of the maximum σ v at the dental region, i.e., 28.267 MPa than that of the tooth model restored with commercial glass fiber post, i.e., 28.320 MPa. It is possible that the GF-reinforced V-fa/ECO biocopolymer post allowed to carry load fractions, since its elastic modulus of 21.47 GPa as reported in Table 4 showed closer to dentin with the elastic modulus approximately 18–20 GPa than the elastic modulus of the commercial glass fiber post, i.e., 37.00 GPa (Ko et al 1992 ; Pegoretti et al 2002 ; Teshigawara et al 2019 ). Therefore, this characteristic indicated that the chance of fracture of the root canal can be reduced by the utilization of the GF-reinforced V-fa/ECO biocopolymer as a glass fiber post.…”

Section: Resultsmentioning

confidence: 99%

Mechanical properties and curing kinetics of bio-based benzoxazine–epoxy copolymer for dental fiber post

Mora,

Rimdusit,

Karagiannidis

et al. 2023

Bioresour. Bioprocess.

View full text Add to dashboard Cite

Biocopolymers based on vanillin/fufurylamine–biobenzoxazine (V-fa) and epoxide castor oil (ECO), a bioepoxy, were prepared for application as dental fiber-reinforced composite post. The mechanical and thermal properties of the V-fa/ECO biocopolymers were assessed with regard to the influence of ECO content. The addition of the ECO at an amount of 20% by weight into the poly(V-fa) preserved the stiffness, glass transition temperature and thermal stability nearly to the poly(V-fa). Differential scanning calorimetry (DSC) was used to examine the curing kinetics of the V-fa/ECO monomer system with different heating rates. To determine the activation energy (Ea), the experimental data were subjected to the isoconversional methods, namely Flynn–Wall–Ozawa (FWO) and Friedman (FR). The V-fa/ECO monomer mixture showed average Ea values of 105 kJ/mol and 94 kJ/mol. The results derived using the curing reaction model and the experimental data were in good agreement, demonstrating the efficacy of the FWO method for determining the curing kinetics parameters. The simulated mechanical response to external applied loads by finite-element analysis of the tooth model restored with glass fiber-reinforced V-fa/ECO biocopolymer post showed a similar stress field to the tooth model restored with a commercial glass fiber post. Therefore, based on the findings in this work, it is evident that the bio-based benzoxazine/epoxy copolymer possesses a great potential to be used for dental fiber post. Graphical Abstract

show abstract

Influence of elastic modulus mismatch between dentin and post-and-core on sequential bonding failure

Cited by 10 publications

References 22 publications

Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing

Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing

Factors Influencing Vertical Radicular Fractures in Teeth Supported by Metallic Dental Core: A Scoping Review

Mechanical properties and curing kinetics of bio-based benzoxazine–epoxy copolymer for dental fiber post

Contact Info

Product

Resources

About