A novel dentin bond strength measurement technique using a composite disk in diametral compression

Huang, Shih-Hao; Lin, Lianshan; Rudney, Joel D.; Jones, Rob; Aparicio, Conrado; Lin, Chun-Pin; Fok, Alex

doi:10.1016/j.actbio.2011.12.036

Cited by 20 publications

(21 citation statements)

References 22 publications

(21 reference statements)

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“…Many mechanical test methods have been used to measure the bond strength between filling materials and tooth tissues, such as the microtensile test, shear test and push-out test [16]. In parallel with our development of the CDC reactor model, we also optimized a system for evaluating failure at the dentin - adhesive - composite interface [17], a major component in a composite restoration. In that system, dentin disks are made from bovine incisor roots, and the canal is enlarged and filled with composite (Fig.…”

Section: Introductionmentioning

confidence: 99%

Degradation in the dentin–composite interface subjected to multi-species biofilm challenges

Li¹,

Carrera²,

Chen³

et al. 2014

Acta Biomaterialia

114

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Oral biofilms can degrade the components in dental resin-based composite restorations, thus compromising marginal integrity and leading to secondary caries. In this study, we investigated the mechanical integrity of the dentin-composite interface challenged with multi-species oral biofilms. While most studies used single-species biofilms, we used a more realistic, diverse biofilm model produced directly from plaques collected from donors with a history of early childhood caries. Dentin–composite disks were made using bovine incisor roots filled with Z100™ or Filtek™ LS (3M ESPE). The disks were incubated for 72hr in paired CDC biofilm reactors, using a previously published protocol. One reactor was pulsed with sucrose, and the other was not. A sterile saliva-only control group was run with sucrose pulsing. The disks were fractured under diametral compression to evaluate their interfacial bond strength. Surface deformation of the disks was mapped using digital image correlation (DIC) to ascertain fracture origin. Fracture surfaces were examined using SEM/EDS to assess demineralization and interfacial degradation. Dentin demineralization was greater under sucrose-pulsed biofilms, as the pH dropped below 5.5 during pulsing, with LS and Z100 specimens suffering similar degrees of surface mineral loss. Biofilm growth with sucrose pulsing also caused preferential degradation of the composite-dentin interface, depending on the composite/adhesive system used. Specifically, Z100 specimens showed greater bond strength reduction and more frequent cohesive failure in the adhesive layer. This was attributed to the inferior dentin coverage by Z100 adhesive which possibly led to a higher level of chemical and enzymatic degradation. The results suggested that factors other than dentin demineralization were also responsible for interfacial degradation. We have thus developed a clinically relevant in vitro biofilm model which would allow us to effectively assess the degradation of the dentin-composite interface subjected to multi-species biofilm challenge.

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Section: Introductionmentioning

confidence: 99%

Degradation in the dentin–composite interface subjected to multi-species biofilm challenges

Li¹,

Carrera²,

Chen³

et al. 2014

Acta Biomaterialia

114

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“…As an alternative bond strength test, we recently proposed a variant of the Brazilian disk test (BDT), or disk in diametral compression, to assess the interfacial debonding of endodontic posts from root dentin (17). The BDT has been used widely for testing the tensile strength and fracture toughness of brittle materials.…”

Section: Introductionmentioning

confidence: 99%

“…The force required to cause failure is used to estimate the tensile strength (20). In the previous work (17), the disk specimen consisted of a slice of root dentin with a section of a circular post cemented in the enlarged concentric root canal. The dentin itself was surrounded by a layer of resin composite to form a disk of 10-mm diameter and 2-mm thick.…”

Section: Introductionmentioning

confidence: 99%

Dentin-composite bond strength measurement using the Brazilian disk test

Carrera

Chen

et al. 2016

Journal of Dentistry

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Objectives This study presents a variant of the Brazilian disk test (BDT) for assessing the bond strength between composite resins and dentin. Methods Dentin-composite disks (φ 5 mm × 2 mm) were prepared using either Z100 or Z250 (3M ESPE) in combination with one of three adhesives, Adper Easy Bond (EB), Adper Scotchbond Multi-Purpose (MP) and Adper Single Bond (SB), and tested under diametral compression. Acoustic emission (AE) and digital image correlation (DIC) were used to monitor debonding of the composite from the dentin ring. A finite element (FE) model was created to calculate the bond strengths using the failure loads. Fracture modes were examined by scanning electron microscopy (SEM). Results Most specimens fractured along the dentin-resin composite interface. DIC and AE confirmed interfacial debonding immediately before fracture of the dentin ring. Results showed that the mean bond strength with EB (14.9±1.9 MPa) was significantly higher than with MP (13.2±2.4 MPa) or SB (12.9±3.0 MPa) (p<0.05); no significant difference was found between MP and SB (p>0.05). Z100 (14.5±2.3 MPa) showed higher bond strength than Z250 (12.7±2.5 MPa) (p<0.05). Majority of specimens (91.3%) showed an adhesive failure mode. EB failed mostly at the dentin-adhesive interface, whereas MP at the composite-adhesive interface; specimens with SB failed at the composite-adhesive interface and cohesively in the adhesive. Conclusions The BDT variant showed to be a suitable alternative for measuring the bond strength between dentin and composite, with zero premature failure, reduced variability in the measurements, and consistent failure at the dentin-composite interface.

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“…It is therefore possible that failure of the disks was caused by dentin fracture. The previous study demonstrated that some disks did fracture near the point of loading [31]. However, as shown in Fig.…”

Section: Discussionmentioning

confidence: 90%

“…Diametral compression is commonly used on homogeneous disks of brittle materials to test their tensile strength. In previous studies, disks of composite-restored dentin rings were successfully used to measure the composite-dentin interfacial bond strength [15,30,31] There was concern that the localized high tensile and shear stresses produced at the contact points between the flat compression plates and the round disk could induce dentin fracture. At the fast fracture load of 400 N, the predicted maximum tensile stress in the dentin of disks restored with Z100 is ∼80 MPa, which is similar to the tensile strength of dentin [31].…”

Section: Discussionmentioning

confidence: 99%

Fatigue failure of dentin–composite disks subjected to cyclic diametral compression

Carrera

Chen

et al. 2015

Dental Materials

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Objective Our aim was to establish the relationship between cyclic loading and fatigue life of the dentin-composite interface using the newly developed disk in diametral compression tests. The results were then used to estimate the fatigue life of restored teeth under occlusal loading. Methods Disk specimens (5mm dia. × 2mm thick) were prepared using bovine incisors and restored with either a methacrylate-based composite Z100™ with Adper Single Bond Plus (Z100) or silorane-based composite Filtek ™ LS with LS System adhesive (LS). The dentin-composite disks were tested under cyclic diametral compression to determine the number of cycles to failure (Nf) at three load levels (n = 3 per group). Finite element analysis (FEA) was used to calculate the interfacial stresses (σ) within the specimen, to establish the σ vs. Nf curves, and those within a restored tooth under normal chewing forces (15N maximum). These were then used to estimate the lifetime of the restored tooth for the two restorative systems. Results The disks restored with LS had a higher fatigue resistance than those restored with Z100. The maximum interfacial stress in the restored tooth determined by FEA was ∼0.5MPa. Based on the estimate of 300,000 cycles of chewing per year, the predicted lifetime under occlusal loading for teeth restored with LS and Z100 was 33 and 10 years, respectively. Significance The disk in cyclic diametral compression has been used successfully to provide fatigue data which allows the lifetime of composite-restored teeth under occlusal loading to be predicted using numerical simulation.

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A novel dentin bond strength measurement technique using a composite disk in diametral compression

Cited by 20 publications

References 22 publications

Degradation in the dentin–composite interface subjected to multi-species biofilm challenges

Degradation in the dentin–composite interface subjected to multi-species biofilm challenges

Dentin-composite bond strength measurement using the Brazilian disk test

Fatigue failure of dentin–composite disks subjected to cyclic diametral compression

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