Mechanical evaluation of five flowable resin composites by the dynamic micro-indentation method

Hirayama, Satoshi; Iwai, Hirotoshi; Tanimoto, Yasuhiro

doi:10.1177/1758736014533983

Cited by 17 publications

(30 citation statements)

References 18 publications

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“…There were no significant differences among the dynamic hardnesses and elastic moduli of the GFRTPs with various fiber contents (Figure ). Micro‐indentation is a depth‐sensing technique that can accurately determine the surface properties of materials on a small scale . This method evaluates the surface properties of GFRTPs, such as the dynamic hardness and elastic modulus.…”

Section: Discussionmentioning

confidence: 99%

“…The mechanical behaviors of the GFRTPs were investigated using a dynamic ultra‐micro‐hardness tester (DUH‐211, Shimadzu, Kyoto, Japan) fitted with a Berkovich indenter tip; the instrument has been described in detail elsewhere . The specimens were fixed to an attached holder.…”

Section: Methodsmentioning

confidence: 99%

“…The indentation penetration depth is continuously recorded as a function of load. The dynamic hardness and elastic modulus can be obtained from the indentation load and penetration depth …”

Section: Methodsmentioning

confidence: 99%

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Fabrication and physical properties of glass‐fiber‐reinforced thermoplastics for non‐metal‐clasp dentures

2016

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Recently, non-metal-clasp dentures (NMCDs) made from thermoplastic resins such as polyamide, polyester, polycarbonate, and polypropylene have been used as removable partial dentures (RPDs). However, the use of such RPDs can seriously affect various tissues because of their low rigidity. In this study, we fabricated high-rigidity glass-fiber-reinforced thermoplastics (GFRTPs) for use in RPDs, and examined their physical properties such as apparent density, dynamic hardness, and flexural properties. GFRTPs made from E-glass fibers and polypropylene were fabricated using an injection-molding. The effects of the fiber content on the GFRTP properties were examined using glass-fiber contents of 0, 5, 10, 20, 30, 40, and 50 mass%. Commercially available denture base materials and NMCD materials were used as controls. The experimental densities of GFRTPs with various fiber contents agreed with the theoretical densities. Dynamic micro-indentation tests confirmed that the fiber content does not affect the GFRTP surface properties such as dynamic hardness and elastic modulus, because most of the reinforcing glass fibers are embedded in the polypropylene. The flexural strength increased from 55.8 to 217.6 MPa with increasing glass-fiber content from 0 to 50 mass%. The flexural modulus increased from 1.75 to 7.42 GPa with increasing glass-fiber content from 0 to 50 mass%, that is, the flexural strength and modulus of GFRTP with a fiber content of 50 mass% were 3.9 and 4.2 times, respectively, those of unreinforced polypropylene. These results suggest that fiber reinforcement has beneficial effects, and GFRTPs can be used in NMCDs because their physical properties are better than those of controls. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 2254-2260, 2017.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Fabrication and physical properties of glass‐fiber‐reinforced thermoplastics for non‐metal‐clasp dentures

2016

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“…This might be explained by the fact that the increase in modulus is mainly achieved with an increase in filler loading, which decreases the capacity of the matrix for plastic deformation. However, composites need a high percentage of inorganic-filler particles to withstand high mechanical stresses [10].…”

Section: Discussionmentioning

confidence: 99%

“…Especially for photo-cured dental resins, a homogenized polymerization is hindered by the shallow polymerization depth. When compared to conventional mechanical testing, the development of instrumented indentation testing (IIT) can provide an array of mechanical properties (elastic modulus, creep, relaxation, different expression of hardness and others), according to ISO [4,10,13], based on the continuous recording of time, force and indentation depth with a Vickers, Berkovich or any other type of indenter that is in contact with the sample surface.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of contemporary orthodontic adhesives used for lingual fixed retention

Sifakakis

Zinelis

Patcas

et al. 2016

Biomedical Engineering / Biomedizinische Technik

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OBJECTIVE The aim of the present study was to test the mechanical properties of different adhesives used in orthodontics for fixed retainers and to investigate their possible interrelations. MA-TERIALS AND METHODS Specimens of six different adhesive resins were prepared: Transbond XT, Transbond LR and an experimental BPA-free orthodontic adhesive, as well as IPS Empress Direct (IPS-ED), ZNano and Accolade. The mechanical properties tested were Martens hardness (HM), indentation modulus (EIT), the ratio of elastic to total work, commonly known as elastic index ( IT) and Vickers hardness (HV). These properties were determined using instrumented indentation testing according to ISO 14577-2002. The results of the aforementioned properties were statistically compared with one-way ANOVA-test and Student-Newman-Keuls multiple comparison test at a=0.05, while possible correlations among the properties tested were analyzed by Pearson correlation. RESULTS Significant differences were identified among all the materials tested for HM, with Transbond LR presenting the highest value. This resin presented the highest EIT too. Significant EIT differences were identified among the materials and only ZNano and IPS-ED showed no significant differences for this property. Transbond LR and ZNano showed higher HV values. ZNano demonstrated the highest elastic index. Pearson analysis showed a strong positive correlation between HM and EIT (0.970), HM and HV (0.837), and EIT and HV (0.695), while a weak negative correlation was found between EIT and elastic index (-0.505). CONCLUSIONS The materials tested demonstrated significant differences in their mechanical properties, and thus differences in their clinical performance are anticipated. Abstract Objective: The aim of the present study was to test the mechanical properties of different adhesives used in orthodontics for fixed retainers and to investigate their possible interrelations. Materials and methods: Specimens of six different adhesive resins were prepared: Transbond XT, Transbond LR and an experimental BPA-free orthodontic adhesive, as well as IPS Empress Direct (IPS-ED), ZNano and Accolade. The mechanical properties tested were Martens hardness (HM), indentation modulus (E IT ), the ratio of elastic to total work, commonly known as elastic index (η IT ) and Vickers hardness (HV). These properties were determined using instrumented indentation testing according to ISO 14577-2002. The results of the aforementioned properties were statistically compared with one-way ANOVA-test and Student-Newman-Keuls multiple comparison test at a = 0.05, while possible correlations among the properties tested were analyzed by Pearson correlation. Results: Significant differences were identified among all the materials tested for HM, with Transbond LR presenting the highest value. This resin presented the highest E IT too. Significant E IT differences were identified among the materials and only ZNano and IPS-ED showed no significant differences for this property. Transbond LR and ZNa...

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Composite Resins Used for Retainer Bonding

Sifakakis

2023

Debonding and Fixed Retention in Orthodontics

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Mechanical evaluation of five flowable resin composites by the dynamic micro-indentation method

Cited by 17 publications

References 18 publications

Fabrication and physical properties of glass‐fiber‐reinforced thermoplastics for non‐metal‐clasp dentures

Fabrication and physical properties of glass‐fiber‐reinforced thermoplastics for non‐metal‐clasp dentures

Mechanical properties of contemporary orthodontic adhesives used for lingual fixed retention

Composite Resins Used for Retainer Bonding

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