Dentin-composite bond strength measurement using the Brazilian disk test

Carrera, Carola A.; Chen, Yung Chung; Li, Yuping; Rudney, Joel D.; Aparicio, Conrado; Fok, Alex

doi:10.1016/j.jdent.2016.07.002

Cited by 22 publications

(25 citation statements)

References 38 publications

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“…Nevertheless, predictions based on Eq. (10) and failure parameters obtained from previous, independent tests [17,23] were close to the experimental data for both sets of accelerated fatigue tests, provided a suitable value for R, Eq. (8), was used.…”

Section: Discussionsupporting

confidence: 69%

“…In total, 60 dentin-composite disc samples were prepared using bovine incisors as described previously [17,23,27]. Root sections from below the cementum-enamel junction with a root canal diameter less than 2 mm and an outer diameter larger than 5 mm were used.…”

Section: Sample Preparationmentioning

confidence: 99%

“…2. The maximum stress at the dentin-composite interface was considered to be the stress, max , that caused failure [23]. Assuming linear elastic behavior, max = k s W = k s k l Nc , i.e., k = k s k l ; see Eq.…”

Section: Fatigue Testingmentioning

confidence: 99%

“…Dentin-composite discs under diametral compression [17,23] are used to create tensile stresses at the interface to cause debonding. A probabilistic model based on the Weibull function [24] and Basquin's stress-life relationship [25] is also developed to analyze the data.…”

Section: Introductionmentioning

confidence: 99%

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Accelerated fatigue testing of dentin-composite bond with continuously increasing load

Guo

et al. 2017

Dental Materials

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Section: Discussionsupporting

confidence: 69%

Section: Sample Preparationmentioning

confidence: 99%

Section: Fatigue Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accelerated fatigue testing of dentin-composite bond with continuously increasing load

Guo

et al. 2017

Dental Materials

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“…The interfacial bond strength of the dentin-composite disks was determined by diametral compression using a universal test machine (858 Mini Bionix II, MTS, MN, USA) with two parallel horizontal steel plates [25]. The load was applied in a stroke-control mode at a speed of 0.5 mm/min.…”

Section: Methodsmentioning

confidence: 99%

Calibration of a lactic-acid model for simulating biofilm-induced degradation of the dentin-composite interface

Zhu

Carrera

et al. 2017

Dental Materials

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Objective To verify and calibrate a chemical model for simulating the degradation of the dentin-composite interface induced by multi-species oral biofilms in vitro. Methods Dentin-composite disks (5-mm dia. × 2-mm thick) were made from bovine incisor roots and filled with either Z100™ (Z100) or Filtek™ LS (LS) composite. The disks, which were covered with nail varnish, but with one of the dentin-composite margins exposed, were immersed in lactic acid solution at pH 4.5 for up to 48 hr. Diametral compression was performed to measure the reduction in bond strength of the dentin-composite disks following acid challenge. Scanning electron microscopy (SEM) was used to examine decalcification of dentin and fracture modes of the disks. To better understand the degradation process, micro-computed tomography, in combination with a radiopaque dye (AgNO3), was used to assess interfacial leakage in 3D longitudinally, while SEM was used to determine the path of leakage. One-way analysis of variance (ANOVA) was used to analyze the results, with the level of statistical significance set at p < 0.05. The results were compared with those obtained previously using multi-species biofilms for verification and calibration purposes. Results After 48 hr of acid challenge, the debonding load of both the LS- and Z100-filled disks reduced significantly (p < 0.05). In the Z100-filled disks, debonding mostly occurred at the adhesive-dentin interface, while in the LS-filled disks, this happened at the adhesive-composite interface, instead. The degree of dentin demineralization, the reduction in debonding load and the modes of failure observed were very similar to those induced by multi-species oral biofilms found in the previous work. Leakage of AgNO3 occurred mainly along the hybrid layer. The specimens filled with Z100 had a thicker hybrid layer (∼6.5 μm), which exhibited more interfacial leakage than those filled with LS. Significance The chemical model with lactic acid used in this study can induce degradation to the dentin-composite interface similar to those produced by multi-species biofilms. With appropriate calibration, this could provide an effective in vitro method for ageing composite restorations in assessing their potential clinical performance.

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Analytical and numerical stress field solutions in the Brazilian Test subjected to radial load distributions and their stress effects at the centre of the disk

et al. 2019

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A new method is developed in order to determine the stress state inside a disk subjected to arbitrary radial compressive distributions along its boundary, obtaining both numerical and closed-form solutions, which is analytically verified through accepted formulations; additionally, alternative expressions for uniform, sinusoidal and parabolic distributions are proposed. Based on the hypothesis of a smooth stress transition along the loaded and unloaded part of the rim, two new distributions (spline and new cosine) are proposed and analysed. Even if closed-form solutions were not feasible, the latter may be accurately solved numerically since the error committed is that of the numerical technique used. Main differences are observed in radial and shear components, whereas hoop ones are relevant on the vicinity of the load application area and the vertical axis. Special attention is paid to the centre of the sample, of which stress state depends on the distribution shape and the contact angle. Finally, it is concluded that there is always a deviation from the values predicted due to the concentrated load as a consequence of the deformation induced by the jaw, which is especially significant in the uniform stress distribution and also influences the determination of the tensile strength in the material.

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Dentin-composite bond strength measurement using the Brazilian disk test

Cited by 22 publications

References 38 publications

Accelerated fatigue testing of dentin-composite bond with continuously increasing load

Accelerated fatigue testing of dentin-composite bond with continuously increasing load

Calibration of a lactic-acid model for simulating biofilm-induced degradation of the dentin-composite interface

Analytical and numerical stress field solutions in the Brazilian Test subjected to radial load distributions and their stress effects at the centre of the disk

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