Nanomechanical Properties of Different Dental Restorative Materials

Altan, Halenur; Bilgiç, Fundagül; Arslanoğlu, Zeki; Kale, Ediz; Kale, Anita; Altan, Ahmet; Şahin, O.

doi:10.12693/aphyspola.130.394

Cited by 7 publications

(8 citation statements)

References 21 publications

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“…In a recent study by Altan et al, glass-ionomer and glass-carbomer cements were compared in terms of H nano [17]. The results have revealed higher mean values for glass-ionomer over glass-carbomer cement, being completely in accordance with those of the present study.…”

Section: Discussionsupporting

confidence: 90%

“…Glass-carbomer cement is relatively new on the market and is very scarcely represented in dental literature [17], whereas there are quite a lot of studies investigating mechanical properties of glass-ionomer, polycarboxylate and resin cements [8,9,11]. Rosenstiel et al have reviewed the mechanical properties of different dental luting cements and have ordered the materials, considering the compressive strength, from low to high, as polycarboxylat, glass-ionomer and resin cements [11].…”

Section: Discussionmentioning

confidence: 99%

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Nanomechanical Comparison of Commonly Used Dental Crown Cements to a Newly Developed One

et al. 2017

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The main goal of nanoindentation tests is to obtain elastic modulus and hardness of the specimen material from load-displacement measurements. With this study, it was aimed to establish a quantitative relationship between the nanomechanical properties of commonly used dental cements in comparison to a newly developed crown cement and to predict its performance potential. Nanomechanical properties of polycarboxylate cement (PCC), glass-ionomer cement (GIC), dual-cure self-adhesive cement (SAC) and a newly developed glass-carbomer cement (GCC) were investigated by nanoindentation tests. All samples were fabricated according to their respective manufacturer's instructions. Available damage on the surface due to manipulation was removed by grinding with 1200, 2400 and 4000 grit sandpaper, and then polishing on 6, 3, and 1 µm diamond-lap-wheel was performed. Nano-mechanical measurements were done using nanoindenter machine with resolution less than 1 nN and displacement resolution of 0.04 nm. Berkovich diamond indenter tip was used for the nanoindentation tests. For each indentation, a set of nanoindentation tests at least on 6 different locations per specimen surface were performed to obtain more representative mean results. Indentation test load-displacement curves were analysed using Oliver-Pharr method, and one-way ANOVA or Kruskal-Wallis test, following Kolmogorov-Smirnov and Shapiro-Wilk, was used to compare the results. Nanohardness (Hnano) values were 0.52±0.25, 0.45±0.18, 1.03±0.82 and 0.43±0.18 GPa for GIC, GCC, PCC, and SAC, respectively. Reduced elastic modulus (Er) values were 9.51 ± 6.17, 11.77 ± 5.04, 27.37 ± 20.61, 10.33 ± 5.08 GPa for GIC, GCC, PCC, and SAC, respectively. There was no statistical difference between the tested materials. PCC was the hardest, and GIC was the least hard material, whereas the newly developed GCC was the second, in terms of Hnano, before SAC. PCC also had the highest Er mean, compared to the other dental crown cements, suggesting lower elastic properties. SAC was more elastic than GCC and less elastic than GIC. GCC had the second highest Er, standing closer to SAC and GIC. Within the limitations of the current study, it can be concluded that the newly developed glass-carbomer cement is comparable to the other tested commonly used dental crown cements, regarding Hnano and Er.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Nanomechanical Comparison of Commonly Used Dental Crown Cements to a Newly Developed One

et al. 2017

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“…Analysis region of each adhesive group and type of indenter may change the values of mechanical properties of materials [22]. The analysis of nanoscale mechanical properties, such as hardness, modulus of elasticity, fracture toughness, yield strength of the adhesives, can be made based on the nanoindentation test [23,24]. Nanoindentation test is a very powerful method to measure samples of smaller sizes, with reliable values of mechanical properties, as the applied force is at micro and nano level [25,26].…”

Section: Discussionmentioning

confidence: 99%

“…They found that the highest overall hardness value had Light-Bond specimens. It was reported that due to lower degree of conversion, chemically cured composites had smaller hardness values than the light-cured ones [24,29].…”

Section: Discussionmentioning

confidence: 99%

Effects of Third-generation LED LCU on Nanomechanical Properties of Orthodontic Adhesives

et al. 2017

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“…For this we used a small load of HV0.1 (0.9807N), in which the distance between the two measuring points was 50 µm, while the load time was 10 s [9][10][11]. The total number of points in the sample was between 15 and 30 (depending on the nitriding parameters, i.e.…”

Section: Methodsmentioning

confidence: 99%

Hardness Curves for 31CrMoV9 Steel after Gas Nitriding

2017

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This work is an experimental study of the hardness curve in the zone of diffusion for the gas nitriding process of 31CrMoV9 steel. 12 samples were subjected to gas nitriding at three different temperatures -510• C, 550• C, and 590• C -and for each temperature four different nitriding times were used. Hardness was measured with an automatic microhardness tester PCE from LECO with a load of HV0.1 (0.9807N), and the distance between the points was 50 µm. It was found that the hardness of the diffusion layer changed from 602 HV to 787 HV. The maximum surface hardness was found at 510• C after nitriding for 16 h. Depending on the process parameters, the depth of the diffusion layer ranged from 270 µm to 700 µm. From the results we can draw conclusions for the gradient curve of nitriding parameters, and from each curve we can find the depth of the diffusion of nitrogen in steel.

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Nanomechanical Properties of Different Dental Restorative Materials

Cited by 7 publications

References 21 publications

Nanomechanical Comparison of Commonly Used Dental Crown Cements to a Newly Developed One

Nanomechanical Comparison of Commonly Used Dental Crown Cements to a Newly Developed One

Effects of Third-generation LED LCU on Nanomechanical Properties of Orthodontic Adhesives

Hardness Curves for 31CrMoV9 Steel after Gas Nitriding

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