Evaluation of the mechanical behavior of bulk-fill and conventional flowable resin composites using dynamic micro-indentation

Iwasaki, Takaya; Kamiya, Naotaka; Hirayama, Satoshi; Tanimoto, Yasuhiro

doi:10.4012/dmj.2021-116

Cited by 5 publications

(7 citation statements)

References 35 publications

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“…However, there have been few studies on the dynamic hardness measured by the micro-indentation method. This method is superior to the two conventional methods: the Knoop hardness and Vickers hardness methods 10) . The micro-indentation method serially saves changes in the displacement during dynamic loading and unloading at the indenter to acquire information about the timedependent deformation, hardness, and indentation elastic modulus of the bracket.…”

Section: Introductionmentioning

confidence: 90%

“…2. The specimens were sputtered in the same manner as described in our previous study 10) . For SEM, the accelerating voltage of the electrons was 5.0 kV.…”

Section: Scanning Electron Microscopy (Sem) Observation Of the Specimensmentioning

confidence: 99%

“…where Er is the reduced elastic modulus from the indenter, V is Poisson's ratio of the specimen, Vi (0.07) is Poisson's ratio of the indenter, and Ei (1,140 GPa) is the elastic modulus of the indenter 10) .…”

Section: Dynamic Micro-indentation Testmentioning

confidence: 99%

“…The dynamic micro-indentation tests were performed in the same measurement condition as described in our previous study 10) . The dynamic hardness and indentation elastic modulus of the surface of the specimen were obtained by the mean values of six specimens, which were each measured three times.…”

Section: Dynamic Micro-indentation Testmentioning

confidence: 99%

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Mechanical characterization of aesthetic orthodontic brackets by the dynamic indentation method

et al. 2022

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The objective of this study is to investigate the mechanical properties, such as the dynamic hardness and indentation elastic modulus, of commercially available aesthetic orthodontic brackets, such as ceramic and plastic brackets, by the dynamic micro-indentation method. Five ceramic brackets, which were made of alumina (both monocrystalline and polycrystalline forms) or zirconia, and two plastic brackets, which were made of glass fiber-reinforced polycarbonate or polyamide, were tested. There were significant differences in the mechanical properties of the monocrystalline and polycrystalline alumina brackets. The mechanical properties of the glass fiber-reinforced plastic bracket were significantly superior to these of the non-glass-fiber-reinforced plastic bracket. The differences in the crystal structures of the ceramic brackets surface affected the dynamic hardness and indentation elastic modulus. Furthermore, the short glass fibers contained in the plastic bracket might contribute to the improvement of the mechanical properties.

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Section: Introductionmentioning

confidence: 90%

“…2. The specimens were sputtered in the same manner as described in our previous study 10) . For SEM, the accelerating voltage of the electrons was 5.0 kV.…”

Section: Scanning Electron Microscopy (Sem) Observation Of the Specimensmentioning

confidence: 99%

Section: Dynamic Micro-indentation Testmentioning

confidence: 99%

Section: Dynamic Micro-indentation Testmentioning

confidence: 99%

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Mechanical characterization of aesthetic orthodontic brackets by the dynamic indentation method

et al. 2022

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“…The resins are characterized by their low polymerization contraction due to their high percentage of inorganic load in their composition (quartz, zirconite or silicate) and photoinitiators with translucent characteristics that allow the passage of light into the restorations; these characteristics improve the contraction of polymerization and allow the passage of light to a great depth, improving restoration techniques. (5,10,12) Due to the uncomfortable clinical process of dental restoration, it is recently a matter of minimizing the operative time of restoration through the practice of different techniques. (13) The incremental technique used in restorations with conventional composite resin promises reduced shrinkage and increased working time because it consists of applying small increments of resin within the cavity preparation accompanied by light curing at intervals, which can generate gaps between increments.…”

Section: Introductionmentioning

confidence: 99%

Dental restoration operative time and analysis of the internal gap caused by the microfiltration of conventional resins (incremental technique) vs. bulk fill (single-increment technique): In vitro study

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Aguilar

et al. 2023

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Background: An incremental technique used in restorations with conventional composite resin promises reduced shrinkage and increased working time; the preparation process consists of applying small increments of resin within a cavity while performing light curing in intervals, which can generate gaps between increments. Bulk fill resin allows the use of single-increment technique, improving operative time and facilitating the restoration. The objective of the present work was to determine the operative time and the internal restoration gap in the restoration–tooth interface in the cavity floor using an incremental technique for conventional resins and the single-increment technique for the bulk fill resin. Methods: In this in vitro experimental study, the internal gaps of the restoration–tooth interfaces in the cavity floors of two conventional resins and two bulk fill resins were microscopically analyzed, and the restoration times of the single-increment technique and the incremental technique were determined. Results: Bulk fill resins had smaller internal gap (63.31 µm) than conventional resins (333.14µm).Regarding the restoration time, the single-increment technique obtained the best results in operative time (3.52 minutes), with significant differences relative to the incremental technique. Conclusions:The Tetric N-Ceram bulk fill resin presented better performance than conventional resins relative to the internal gap of the restoration–tooth interface in the cavity floor. In addition, the single-increment technique presented a short clinical restoration time.

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Martens Hardness of CAD/CAM Resin-Based Composites

et al. 2022

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(1) Background: The properties of CAD/CAM resin-based composites differ due to differences in their composition. Instrumented indentation testing can help to analyze these differences with respect to hardness, as well as energy-converting capabilities due to viscoelastic behavior. (2) Methods: Eleven materials were investigated using instrumented indentation testing. Indentation depth (hr), Martens hardness (HM), indentation hardness (HIT), indentation modulus (EIT), the elastic part of indentation work (ηIT), and indentation creep (CIT) were investigated, and statistical analysis was performed using one-way ANOVA, Bonferroni post-hoc test, and Pearson correlation (α = 0.05). (3) Results: All of the investigated parameters revealed differences between the analyzed materials. Besides the differences in hardness-associated parameters (hr, HM, and HIT), instrumented indentation testing demonstrated differences in energy-converting properties. The subsequent one-way ANOVA revealed significant differences (p < 0.001). A significant (p < 0.01, Pearson correlation >0.576) correlation between the materials and HM, HIT, or EIT was identified. (4) Conclusions: Due to the differences found in the energy-converting properties of the investigated materials, certain CAD/CAM resin-based composites could show superior stress-breaking capabilities than others. The consequential reduction in stress build-up may prove to beneficial, especially for implant-retained restorations or patients suffering from parafunctions.

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Evaluation of the mechanical behavior of bulk-fill and conventional flowable resin composites using dynamic micro-indentation

Cited by 5 publications

References 35 publications

Mechanical characterization of aesthetic orthodontic brackets by the dynamic indentation method

Mechanical characterization of aesthetic orthodontic brackets by the dynamic indentation method

Dental restoration operative time and analysis of the internal gap caused by the microfiltration of conventional resins (incremental technique) vs. bulk fill (single-increment technique): In vitro study

Martens Hardness of CAD/CAM Resin-Based Composites

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