Micromechanics of dental cement paste

Dohnalík, Petr; Pichler, Bernhard; Zelaya-Lainez, Luis; Lahayne, Olaf; Richard, Gilles; Hellmich, Christian

doi:10.1016/j.jmbbm.2021.104863

Cited by 6 publications

(19 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12 suggest that the strength evolution does, strictly speaking, not come to an end. This is consistent with images of the microstructure of Biodentine taken 4 months after production, which show a significant volume fraction of residual cement grains [see Figure 6 of Dohnalík et al (2021) ], underlining that there is still hydratable matter left. In order to extrapolate the evolution of the uniaxial compressive strength of Biodentine to a material age of 4 months, Eq.…”

Section: Standards-based Evaluation Of Experimental Datasupporting

confidence: 86%

“…12 is evaluated for t = 120 days. This delivers:

257.4 267.8

Notably, at the material age of 4 months, grid nanoindentation tests were performed on Biodentine ( Dohnalík et al, 2021 ).…”

Section: Standards-based Evaluation Of Experimental Datamentioning

confidence: 99%

“…In the first two subsections, essential prerequisites are recalled in order to achieve a stand-alone character of this manuscript. Section 4.1 presents results from a grid nanoindentation testing campaign performed on polished surfaces of mature Biodentine, taken from ( Dohnalík et al, 2021 ). Section 4.2 presents a micromechanics model for the elastic stiffness of mature Biodentine, which allows for downscaling macrostresses imposed on a representative volume of mature Biodentine to microstresses experienced by microscopic hydrates, taken from ( Dohnalík et al, 2022 ).…”

Section: Microscopic Origin Of the Macroscopic Uniaxial Compressive S...mentioning

confidence: 99%

“…Strength modeling builds on the results of two preceding studies, as explained next. The microstructure of mature Biodentine consists of zirconium dioxide, residual calcium silicates, and two populations of calcite-reinforced hydration products ( Dohnalík et al, 2021 ). The expression “populations” is to be understood statistically, because more than 5,000 nanoindentation tests into hardened Biodentine underlined that the stiffness and strength of both types of hydrates are lognormally distributed ( Dohnalík et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

“…The microstructure of mature Biodentine consists of zirconium dioxide, residual calcium silicates, and two populations of calcite-reinforced hydration products ( Dohnalík et al, 2021 ). The expression “populations” is to be understood statistically, because more than 5,000 nanoindentation tests into hardened Biodentine underlined that the stiffness and strength of both types of hydrates are lognormally distributed ( Dohnalík et al, 2021 ). The stiffness distributions were accounted for in the first continuum mechanics model for the elastic stiffness of well-hardened Biodentine ( Dohnalík et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Strength of a cement-based dental material: Early age testing and first micromechanical modeling at mature age

Dohnalík

Hellmich²,

Richard³

et al. 2023

Front. Bioeng. Biotechnol.

Self Cite

View full text Add to dashboard Cite

The compressive strength evolution of 37 centigrade-cured Biodentine, a cement-based dental material, is quantified experimentally by crushing cylindrical specimens with length-to-diameter ratios amounting to 1.84 and 1.34, respectively, at nine different material ages ranging from 1 h to 28 days. After excluding strength values significantly affected by imperfections, formulae developed for concrete are i) adapted for inter- and extrapolation of measured strength values, and ii) used for quantification of the influence of the slenderness of the specimens on the compressive strength. The microscopic origin of the macroscopic uniaxial compressive strength of mature Biodentine is investigated by means of a micromechanics model accounting for lognormal stiffness and strength distributions of two types of calcite-reinforced hydrates. The following results are obtained: The material behavior of Biodentine is non-linear in the first few hours after production. After that, Biodentine behaves virtually linear elastic all the way up to sudden brittle failure. The strength evolution of Biodentine can be well described as the exponential of a function involving the square root of the inverse of the material age. The genuine uniaxial compressive strength evolution can be quantified using a correction formula taken from a standard for testing of concrete, which accounts for length-to-diameter ratios of cylindrical samples deviating from 2. Multiscale modeling suggests that 63% of the overall material volume, occupied by dense calcite-reinforced hydration products, fail virtually simultaneously. This underlines the highly optimized nature of the studied material.

show abstract

Section: Standards-based Evaluation Of Experimental Datasupporting

confidence: 86%

“…12 is evaluated for t = 120 days. This delivers: