Fractal analysis at varying locations of clinically failed zirconia dental implants

Jodha, K.S.; Marocho, S.M. Salazar; Scherrer, Susanne S.; Griggs, Jason A.

doi:10.1016/j.dental.2020.04.021

Cited by 11 publications

(7 citation statements)

References 23 publications

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“…Regarding mechanical properties, DPBHA reached biaxial flexural strength (FS) about 235.2 MPa, Vickers hardness about 335 GPa, and a high Weibull modulus ( m) , and characteristic life (σ0) 6 . Yttria‐stabilized tetragonal zirconia polycrystal (Y‐TZP) microstructure is similar to that of DPBHA but with higher mechanical values, ranging from 680 to 1200 MPa of FS 7–13 and from 3.17 to 8 MPa.m 1/2 of fracture toughness 14 …”

Section: Introductionmentioning

confidence: 92%

“…5 Regarding mechanical properties, DPBHA reached biaxial flexural strength (FS) about 235.2 MPa, Vickers hardness about 335 GPa, and a high Weibull modulus (m), and characteristic life (σ0). 6 Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) microstructure is similar to that of DPBHA but with higher mechanical values, ranging from 680 to 1200 MPa of FS [7][8][9][10][11][12][13] and from 3.17 to 8 MPa.m 1/2 of fracture toughness. 14 Seeking for improving one of the most important mechanical properties from ceramic materials, fracture toughness, which measures the stress concentration at a crack tip (intensity factor -K IC 15 ), TiO 2 , ZnO, Y-TZP, Al 2 O 3 , and graphene at nanoscale have been added to reinforce ceramic materials.…”

Section: Introductionmentioning

confidence: 93%

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Novel 8%‐TiO₂‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic

Azevedo-Silva

Ferrairo

Pires

et al. 2022

Int J Ceramic Engine & Sci

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This study aimed to produce and characterize the microstructure and mechanical properties of dense polycrystalline bovine hydroxyapatite (DPBHA) bioceramics with 5% and 8% of TiO 2 nanoparticles after final synthetization for future use in dental implants. Structural characterization was obtained from analyzes by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy, and relative density and apparent porosity. The mechanical characterization was performed by measuring the fracture toughness after three-point flexural strength (FS) test. The microstructural characterization results showed no secondary phase formation and nonhomogeneous nanoparticle dispersion in HA matrix. DPBHA/Np8% (2.9 ± 0.09 g/cm 3 ) exhibited significantly greater density than DPBHA (2.7 ± 0.03 g/cm 3 ) (p = 0.011) and DPBHA/Np5% (2.7 ± 0.05 g/cm 3 ) (p = 0.041). DPBHA (0.9%) had the smallest porosity followed by DPBHA/Np8% (3.4%). DPBHA/Np5% (4.5%) exhibited the greatest proportion of pores. Pure HA (51.7 ± 10.3 MPa) and DPBHA/Np8% (47.4 ± 6.4 MPa) had significant greater FS (p < 0.001) than DPBHA/Np5% (28.8 ± 3.1 MPa). DPBHA (0.43 ± 0.01 MPa m 1/2 ) and DPBHA/Np8% (0.40 ± 0.06 MPa m 1/2 ) presented greater KIc than DPBHA/Np5% (0.23 ± 0.02 MPa m 1/2 ) (p < 0.003; p < 0.007). In conclusion, 8% TiO 2 nanoparticle addition to this synthesis would be a promising HA blend, as mechanical properties were similar, and the relative density/apparent porosity showed superior results than those of the DPBHA.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 93%

Novel 8%‐TiO₂‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic

Azevedo-Silva

Ferrairo

Pires

et al. 2022

Int J Ceramic Engine & Sci

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“…After eliminating the obstacles described above, the revised protocol was used to examine clinically failed Y-TZP dental implants. Several brands of dental implants were examined: Axis Biodental (n=7), Z-Systems (n=3), Straumann (n=1), and SDS (n=1) [22]. Polyvinylsiloxane impressions (Extrude) were made from several locations on each implant fracture surface, and the corresponding epoxy replicas were scanned under AFM ( Figure 6).…”

Section: Past Obstaclesmentioning

confidence: 99%

“…The direction of crack propagation was from left to right. After Jodha et al [22]. Mean and standard deviation of D* values measured on Brownian interpolation surfaces (n=10) having a true D* value of 0.4.…”

Section: Highlightsmentioning

confidence: 99%

Using fractal geometry to examine failed implants and prostheses

Griggs

2018

Dental Materials

Self Cite

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Objectives: To develop a novel protocol that is precise and accurate for analyzing the fracture surfaces of ceramic specimens using fractal geometry and to demonstrate its use on both clinically retrieved specimens and standard test specimens. Methods: A MathCAD script was written to transfer data from atomic force microscope scans to the FRACTALS software of John Russ. This software provided six algorithms for analyzing surfaces, so an experiment was conducted to determine which algorithm provided the most precision in fractal dimensional increment (D*) values and to calibrate that algorithm on surfaces generated with known D* values. Physical specimens were then tested using the chosen algorithm. These included pure silica glass fractured in deionized water versus nominally identical specimens fractured in saliva. Light body polyvinysiloxane was used to make impressions of Y-TZP fracture surfaces, and replicas were casted using a low-viscosity, low-shrinkage epoxy. Clinically failed Y-TZP dental implants were also examined. In addition, the fracture toughness and D* values of four ceramic materials (silicon nitride, silica glass, Y-TZP, and lithium disilicate glass-ceramic) were tested using standard geometry flexure beam specimens (ISO 6872). Results: The Minkowksi Cover algorithm was the most precise algorithm, and it had a negative bias that was corrected. There was no difference in D* based on water vs. saliva environment (p>0.05), and D* values from the deionized water group had lower standard deviation. The mean D* value obtained from the epoxy replicas 2.247 (0.007) was the same as that obtained from the original Y-TZP specimens 2.245 (0.002) (p=0.43, paired t-test). All scanned areas of the dental implants were fractal in nature, and there was no difference in fractal dimension between the locations near the failure origin and those far from the origin (on the compression curl) (p=0.74, repeated measures ANOVA). There was little scatter in the data collected using the revised protocol on ISO 6872 specimens, and the regression models succeeded in passing through the origin while achieving a good fit to the data (R 2 = 0.99 and 0.95). Significance: The new protocol proved to be a powerful tool in analyzing fracture surfaces of dental ceramic materials.

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“…The topography of a surface can be examined using such imaging methods as light microscopy, atomic microscopy (AFM), scanning tunneling microscopy (STM), and electron microscopy (SEM) [ 33 ]. FDA is broadly used in surface testing of such dental materials as lithium disilicate-based crowns [ 38 ], zirconia dental implants [ 39 ], or dental restorative composite [ 40 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Texture and Fractal Dimension Analysis to Evaluate Subgingival Cement Surfaces in Terms of Biocompatibility

Skośkiewicz−Malinowska

Mysior²,

Rusak

et al. 2021

Materials

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Biocompatibility is defined as “the ability of a biomaterial, prosthesis, or medical device to perform with an appropriate host response in a specific application”. Biocompatibility is especially important for restorative dentists as they use materials that remain in close contact with living tissues for a long time. The research material involves six types of cement used frequently in the subgingival region: Ketac Fil Plus (3M ESPE, Germany), Riva Self Cure (SDI, Australia) (Glass Ionomer Cements), Breeze (Pentron Clinical, USA) (Resin-based Cement), Adhesor Carbofine (Pentron, Czech Republic), Harvard Polycarboxylat Cement (Harvard Dental, Great Britain) (Zinc polycarboxylate types of cement) and Agatos S (Chema-Elektromet, Poland) (Zinc Phosphate Cement). Texture and fractal dimension analysis was applied. An evaluation of cytotoxicity and cell adhesion was carried out. The fractal dimension of Breeze (Pentron Clinical, USA) differed in each of the tested types of cement. Adhesor Carbofine (Pentron, Czech Republic) cytotoxicity was rated 4 on a 0–4 scale. The Ketac Fil Plus (3M ESPE, Germany) and Riva Self Cure (SDI, Australia) cements showed the most favorable conditions for the adhesion of fibroblasts, despite statistically significant differences in the fractal dimension of their surfaces.

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Fractal analysis at varying locations of clinically failed zirconia dental implants

Cited by 11 publications

References 23 publications

Novel 8%‐TiO₂‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic

Novel 8%‐TiO₂‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic

Using fractal geometry to examine failed implants and prostheses

Application of Texture and Fractal Dimension Analysis to Evaluate Subgingival Cement Surfaces in Terms of Biocompatibility

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Fractal analysis at varying locations of clinically failed zirconia dental implants

Cited by 11 publications

References 23 publications

Novel 8%‐TiO2‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic

Novel 8%‐TiO2‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic

Using fractal geometry to examine failed implants and prostheses

Application of Texture and Fractal Dimension Analysis to Evaluate Subgingival Cement Surfaces in Terms of Biocompatibility

Contact Info

Product

Resources

About

Novel 8%‐TiO₂‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic

Novel 8%‐TiO₂‐nanoparticle‐reinforced dense polycrystalline bovine hydroxyapatite bioceramic