Comparative hardness and modulus of tooth-colored restoratives: A depth-sensing microindentation study

Yap, Adrian Ujin; Wang, Xiaoyan; Wu, Xiaohu; Chung, Shin

doi:10.1016/j.biomaterials.2003.09.003

Cited by 79 publications

(61 citation statements)

References 26 publications

(31 reference statements)

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“…In diametral tensile strength tests, the elastic modulus of enamel is approximately thrice that of dentin (82.7 GPa versus 18.6 GPa). 27 The modulus of glass ionomer cements (~11 GPa) 28 is considered to be close to that of dentin. In our study, we calculated only the ratio between the load and the transverse area, and the diameter variation in the compression direction (i.e., the stiffness), during the diametral tensile strength test.…”

Section: Discussionmentioning

confidence: 99%

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

et al. 2015

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In this study, conventional restorative glass ionomer cement (GIC) was modified by embedding it with mechanically processed cellulose fibers. Two concentrations of fibers were weighed and agglutinated into the GIC during manipulation, yielding Experimental Groups 2 (G2; 3.62 wt% of fibers) and 3 (G3; 7.24 wt% of fibers), which were compared against a control group containing no fibers (G1). The compressive strengths and elastic modulus of the three groups, and their diametral tensile strengths and stiffness, were evaluated on a universal test machine. The compressive and diametral tensile strengths were significantly higher in G3 than in G1. Statistically significant differences in elastic modulus were also found between G2 and G1 and between G2 and G3, whereas the stiffness significantly differed between G1 and G2. The materials were then characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Heterogeneously shaped particles were found on the G2 and G3 surfaces, and the cement matrices were randomly interspersed with long intermingled fibers. The EDS spectra of the composites revealed the elemental compositions of the precursor materials. The physically processed cellulosic fibers (especially at the higher concentration) increased the compressive and diametral tensile strengths of the GIC, and demonstrated acceptable elastic modulus and stiffness.

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Section: Discussionmentioning

confidence: 99%

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

et al. 2015

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“…Three-point bending test specimens (2×2×25 mm 3 ) were made from each tested composite. Bar-shaped specimens were made in a half-split stainless steel mold between transparent Mylar sheets.…”

Section: Mechanical Testsmentioning

confidence: 99%

“…Compomers are anhydrous and the glass ionomer phase can be formed only upon water uptake into the resin matrix. On the other hand, giomers employ the use of prereacted glass ionomer (PRG) technology to form the glass ionomer phase 3) . Giomers incorporate fillers that are produced from the complete or partial reaction of ion-leachable glasses with polyalkenoic acids.…”

Section: Introductionmentioning

confidence: 99%

“…Giomers incorporate fillers that are produced from the complete or partial reaction of ion-leachable glasses with polyalkenoic acids. Since PRG fillers are pre-reacted, acidic resin monomers are not necessary for in situ acid-base reactions 3) . Beside the ability to release fluoride and inhibit recurrent caries, fluoride releasing materials have the advantage of natural shade and they are less expensive compared with cast gold and ceramic restorations.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of fluoride releasing restorative dental materials

2018

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This study aimed to evaluate and compare certain mechanical properties, Vickers-hardness, water sorption, fluoride-release, shrinkage-stress and wear of five commercial fluoride-releasing restorative materials (Dyract, CompGlass, BEAUTIFIL II, ACTIVARestorative, and GC Fuji II LC), in relation to their microstructural characteristics. Mechanical properties were determined for each material following ISO standards. A wear test was conducted with 15,000 chewing cycles using a dual-axis chewing simulator. Daily fluoride-release was measured during the first 10 days by using a fluoride ion selective electrode. Scanning electron microscopy (SEM) was used to evaluate the microstructure of each material. Results were statistically analysed using ANOVA followed by post hoc Tukey's test. ACTIVA-Restorative exhibited the highest fracture toughness (1.1 MPa m 1/2 ) among the materials tested. BEAUTIFIL II presented the highest flexural strength (145 MPa) which was not significantly different (p>0.05) from CompGlass and Dyract. Highest fluoride-release measurement was located for GC Fuji II LC among other tested materials.

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“…It thus seems plausible that some trends can exist in the relationship between the mechanical properties of resin composites 13) . There is a large amount of data in the literature on the mechanical properties of resin Investigation of the correlation between the different mechanical properties of resin composites 13,24) , HV and FM 25) , FT and BH 22) , HK and FT 26,27) , CS and DTS 28) , FS and DTS 29) , and FS and FM/CS/DTS 16) . Recently, Takahashi et al 30) conducted correlation analysis for the more integrated mechanical parameters including tensile properties, but this analysis was performed in six nano-hybrid and two other composites.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the correlation between the different mechanical properties of resin composites

et al. 2013

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The aim of this study was to investigate the relationship between the different mechanical properties with the filler fraction of various resin composites. Mechanical properties of eighteen different resin composites were investigated in this study; flexural strength (FS), flexural modulus (FM), fracture toughness (FT), compressive strength (CS), diametral tensile strength (DTS), Barcol hardness (BH), Vickers hardness (HV), and Knoop hardness (HK). The mean values of mechanical properties and the filler fractions (V f ) obtained from the literature and the manufacturer were analyzed using Pearson's correlation test at p<0.01. The relationships were compared with the data retrieved from previous studies. Strong correlations between V f and BH/HV/HK and V f and FM were evident in the results of the present study and these results were supported by the retrieved data from previous studies. The other relationships between mechanical properties, such as that between FS and FM and between CS and HV were not significant.

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Comparative hardness and modulus of tooth-colored restoratives: A depth-sensing microindentation study

Cited by 79 publications

References 26 publications

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

Characterization of fluoride releasing restorative dental materials

Investigation of the correlation between the different mechanical properties of resin composites

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