Relationship between fracture toughness and fractal dimensional increment in two types of dental glass-ceramics with different fracture surface roughness

Jodha, K.S.; Kaur, Navleen; Marocho, S.M. Salazar; Mecholsky, John J.; Lirette, Seth T.; Duan, Yan; Griggs, Jason A.

doi:10.1016/j.dental.2022.11.011

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…The values are presented as mean (standard deviation). The present σ F values correspond to d = 1 mm. a Sen and Us (2018). b Stawarczyk et al (2021). c Wang et al (2020). d Demirel et al (2023). e Al-Johani et al (2023). f Diken Türksayar et al (2022). g Alves et al (2019). h Elsaka and Elnaghy (2016). i Alkadi and Ruse (2016). j Jodha et al (2022). k Lubauer et al (2022). l Čokić et al (2022). m Too et al (2021). n Spintzyk et al (2021). …”

Section: Methodsmentioning

confidence: 99%

“…Measuring K C is more involved due to the need to introduce a sharp precrack. The most popular specimens used are the 3-point bending flexure and compact tension specimens with a Chevron notch or local precrack ( Alkadi and Ruse 2016 ; Elsaka and Elnaghy 2016 ; Alves et al 2019 ; Jodha et al 2022 ) and Vickers indentation on a flat surface ( Villas-Boas et al 2020 ; Čokić et al 2022 ). The Vickers test avoids the need to introduce a sharp precrack, but its data reduction is marred by plastic deformation and residual stresses at the indentation site ( Anstis et al 1981 ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Bilayer Method for Measuring Toughness and Strength of Dental Ceramics

Chai,

Russ,

Vardhaman

et al. 2024

J Dent Res

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The ever-increasing usage of ceramic materials in restorative dentistry necessitates a simple and effective method to evaluate flexural strength σF and fracture toughness KC. We propose a novel method to determine these quantities using a bilayer specimen composed of a brittle plate adhesively bonded onto a transparent polycarbonate substrate. When this bilayer structure is placed under spherical indentation, tunneling radial cracks initiate and propagate in the lower surface of the brittle layer. The failure analysis is based on previous theoretical relationships, which correlate σF with the indentation force P and layer thickness d, and KC with P and mean length of radial cracks. This work examines the accuracy and limitations of this approach using a wide range of contemporary dental ceramic materials. The effect of layer thickness, indenter radius, load level, and length and number of radial cracks are carefully examined. The accuracy of the predicted σF and KC is similar to those obtained with other concurrent test methods, such as biaxial flexure and 3-point bending (σF), and bending specimens with crack-initiation flaws ( KC). The benefits of the present approach include treatment for small and thin plates, elimination of the need to introduce a precrack, and avoidance of dealing with local material nonlinearity effects for the KC measurements. Finally, the bilayer configuration resembles occlusal loading of a ceramic restoration (brittle layer) bonded to a posterior tooth (compliant substrate).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Bilayer Method for Measuring Toughness and Strength of Dental Ceramics

Chai,

Russ,

Vardhaman

et al. 2024

J Dent Res

View full text Add to dashboard Cite

show abstract

“…They performed the fractal analysis of surface cracks, including evaluating the fractal dimension with a fracture energy calculation. Recently, the correlation between the fracture toughness and fractal dimension increment in two dental glass-ceramics, varying in crystal volume fraction and fracture surface roughness, was determined by Jodha et al [11]. Fractal analysis is increasingly prominent in characterizing composite materials, particularly in developing models for various mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Agglomerates Hausdorff Dimension and Mechanical Properties of Denture Poly(methyl methacrylate)-Based Composites

Elhmali,

Serpa,

Radojevic

et al. 2024

Fractal Fract

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The microstructure–property relationship in poly(methyl methacrylate) PMMA composites is very important for understanding interface phenomena and the future prediction of properties that further help in designing improved materials. In this research, field emission scanning electron microscopy (FESEM) images of denture PMMA composites with SrTiO3, MnO2 and SrTiO3/MnO2 were used for fractal reconstructions of particle agglomerates in the polymer matrix. Fractal analysis represents a valuable mathematical tool for the characterization of the microstructure and finding correlation between microstructural features and mechanical properties. Utilizing the mathematical affine fractal regression model, the Fractal Real Finder software was employed to reconstruct agglomerate shapes and estimate the Hausdorff dimensions (HD). Controlled energy impact and tensile tests were used to evaluate the mechanical performance of PMMA-MnO2, PMMA-SrTiO3 and PMMA-SrTiO3/MnO2 composites. It was determined that PMMA-SrTiO3/MnO2 had the highest total absorbed energy value (Etot), corresponding to the lowest HD value of 1.03637 calculated for SrTiO3/MnO2 agglomerates. On the other hand, the highest HD value of 1.21521 was calculated for MnO2 agglomerates, while the PMMA-MnO2 showed the lowest Etot. The linear correlation between the total absorbed impact energy of composites and the HD of the corresponding agglomerates was determined, with an R2 value of 0.99486, showing the potential use of this approach in the optimization of composite materials’ microstructure–property relationship.

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