Mini-interfacial fracture toughness as a new validated enamel-bonding effectiveness test

Pongprueksa, Pong; Munck, Jan De; Barreto, Bruno de Castro Ferreira; Karunratanakul, Kavin; Meerbeek, Bart Van

doi:10.1016/j.jmbbm.2016.05.022

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…While a reliable bonding to enamel has been established decades ago, the current results demonstrate that the enamel marginal seal is still at risk. Enamel gaps were more extensive in the 1-SEAs than in 2-SEAs, which is in line with previous reports on lower enamel bond strength (Pongprueksa et al 2016) and higher microleakage of the former (Schwendicke et al 2015). Another important finding was the development of postcuring enamel cracks along the enamel walls of some specimens (Appendix Fig.…”

Section: Discussionsupporting

confidence: 90%

Real-Time Imaging of Gap Progress during and after Composite Polymerization

et al. 2017

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The aims of this study were to observe the behavior of composite and formation of gaps during and immediately after light polymerization using swept source optical coherence tomography (OCT) and to compare the interfacial integrity of adhesives in cavities through 3-dimensional (3D) image analysis. Forty tapered cylindrical cavities (4-mm diameter, 2-mm depth) were prepared in bovine incisors and restored using Bond Force (BF), Scotchbond Universal Adhesive (SBU), OptiBond XTR (XTR), or Clearfil SE Bond 2 (SE2), followed by Estelite Flow Quick flowable composite. Real-time imaging was performed at the center of restoration by the OCT system (laser center wavelength: 1,330 nm; frequency: 30 KHz) during and up to 10 min after light curing. The 3D scanning was performed 0, 1, 3, 5, and 10 min after light curing. The percentages of sealed enamel and dentin interface area (E%, D%) were calculated using Amira software. In real-time videos, the initial gaps appeared as a bright scattered area mainly on dentin floor and rapidly progressed along the cavity floor. The timing, rate, and extent of gap formation were different among the specimens. From 3D visualization, gap progress could be seen on both enamel and dentin even after irradiation; furthermore, typical toroidal gap patterns appeared at the dentin floor of BF and SBU. XTR and SE2 showed nearly perfect sealing performance on the dentin floor up to the 10 min that images were recorded. From quantitative analysis, SE2 and XTR showed significantly higher E% and D% than other groups. SBU showed the smallest E% and BF showed a significantly smaller D% than other groups ( P < 0.05). In conclusion, real-time observation of composite placement and 3D quantification of interfacial gaps were implemented within the experimental limitations. Interfacial gap formation during polymerization of the composite depended on the adhesive system used. The formed gaps continued to propagate after composite light curing finished.

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Section: Discussionsupporting

confidence: 90%

Real-Time Imaging of Gap Progress during and after Composite Polymerization

et al. 2017

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“…(1) Ideally, bonding effectiveness should be measured by determining the strength of the adhesive interface solely, which can be achieved best using a fracture toughness approach. (16) In this study fracture toughness test was used as its values are not test-dependent and also less affected by random flaws in the test specimens so, better comparable, and less variable and more universal values.…”

Section: Discussionmentioning

confidence: 99%

Fracture toughness of different adhesive/dentin interfaces analyzed by finite element stress analysis

Mustafa

Kandil

Nassef

et al. 2021

Egyptian Dental Journal

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Objectives: This study aimed to assess the fracture toughness of different dentin adhesive approaches and to evaluate the stress distribution at the bond interface during fracture toughness testing by finite element analysis.Materials and Methods: Specimens for chevron-notched beam fracture toughness (CNB) were prepared with dimensions of (3.0 mm × 4.0 mm × 20 mm) according to ISO 24370:2005 standard. Chevron notch was prepared at the adhesive-dentin interface using a highly polished stainless steel spacer. Four different dentin adhesives approaches were used total etch 3 and 2 step and self adhesives 2 and 1 step. A total of 60 specimens were prepared for each adhesive approach (n=15). Each specimen was loaded until failure in a 4-point bend test setup and the fracture toughness was calculated according to the ISO specifications. Finite element modeling of the specimens was carried out in order to analyze stress distribution during fracture toughness testing. Data were analyzed by one-way ANOVA followed by tukey's post hoc test with significant level at p < 0.001 level (p= 0.0001).Results: Solobond plus 3-step etch-and-rinse showed the highest mean fracture toughness (1.78 MPam 1/2 ) Whereas, Futurabond M+ 1-step self-etch showed the lowest value (1.13 MPam 1/2 ). These finding were supported by finite element analysis which showed stresses to concentrate at the adhesive-dentin interface during fracture toughness loading and crack propagation. Conclusion:The adhesive approach has a strong effect on the fracture toughness of the adhesive-dentin interface. the 3-step etch-and-rinse approach showed the highest mean fracture toughness while 1-step self-etch approach showed the lowest value.

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“…3 ), may suffer from smear-layer interference and thus explain the lower fracture toughness. In another study, the lowest interfacial fracture toughness onto enamel was found for the adhesives applied following a one-step self-etch approach ( 15 ).…”

Section: Discussionmentioning

confidence: 99%

“…Fracture toughness test is considered a more valid method to assess bonding effectiveness compared with conventional bond strength testing ( 13 ). However, to date, only few studies have measured fracture toughness using various methodologies ( 12 - 15 ).…”

Section: Introductionmentioning

confidence: 99%

Interfacial fracture toughness of universal adhesive systems treated with an antioxidant

Samimi

Nazem²,

Shirban

et al. 2018

J Clin Exp Dent

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BackgroundSecondary caries, degradation of the dentin-resin interface and fracture of the restoration are the most common forms of failure. The aim of this study was to assess the interfacial fracture toughness of three different adhesive approaches and to compare their fracture toughness after surface treatment with antioxidant.Material and MethodsSeventy two dentin blocks with 3×4mm dimension and 3mm thickness were prepared and attached to precured 3×4×12mm composite blocks from both sides. Six adhesive groups (N=12), All-bond universal, Scotchbond universal and Clearfil SE bond with or without antioxidant treatment (Sodium Ascorbate 10% )were applied to dentin surfaces, a 160µ polyethylene paper formed the chevron in adhesive-dentin interfaces. Chevron-notched beam fracture toughness was measured following a modified ISO 24370 standard. The uniform composite-dentin-composite block was subjected to a 4-point test in universal machine. Data were analyzed by Kruskal-Wallis, Wilcoxon signed-rank and Mann-Whitney tests (α =0.05).ResultsDifferent adhesive approaches yielded different significant in fracture toughness rates. A significant increase of fracture toughness was observed between adhesive groups after antioxidant surface treatment. The difference in fracture toughness between Scotchbond universal and All-bond universal were significant.ConclusionsThe highest value of fracture toughness was reported for Clearfil SE bond and the lowest value was found for All-bond universal. Sodium ascorbate as antioxidant surface treatment had a significant effect in increasing the fracture toughness. Key words:Chevron-notched beam fracture toughness, fracture toughness, dentin, adhesive, antioxidant.

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Mini-interfacial fracture toughness as a new validated enamel-bonding effectiveness test

Abstract: mini-iFT appeared a valid alternative method to assess the mechanical properties of adhesive-enamel interfaces.

Cited by 7 publications

References 46 publications

Real-Time Imaging of Gap Progress during and after Composite Polymerization

Real-Time Imaging of Gap Progress during and after Composite Polymerization

Fracture toughness of different adhesive/dentin interfaces analyzed by finite element stress analysis

Interfacial fracture toughness of universal adhesive systems treated with an antioxidant

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