Viscoelastic properties of human periodontal ligament: <i>Effects of the loading frequency and location</i>

Wu, Bin; Zhao, Siyu; Shi, Haotian; Lu, Ruxin; Yan, Bin; Ma, Songyun; Markert, Bernd

doi:10.2319/062818-481.1

Cited by 18 publications

(17 citation statements)

References 19 publications

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“…Consistent with previous findings of the human PDL revealing a frequency-related viscoelasticity under dynamic tension [ 12 ], our current experiment yielded similar results when the analysis was extended to compressive forces. However, the dynamic moduli were much greater in the compression test than in the tension test (E’ from 0.808 MPa to 7.274 MPa, E'' from 0.087 MPa to 0.891 MPa).…”

Section: Discussionsupporting

confidence: 92%

“…Due to collagen fibers’ resistance against tensile loads and ground substance tolerance against compressive loads, the PDL has displayed different mechanical responses under tension and compressive loadings [ 11 ]. We clarified the viscoelastic properties of the human PDL under dynamic tension in our former study, in which the viscoelasticity of PDL was believed to be related to frequency, tooth position, and root level [ 12 ]. However, its mechanical behavior under dynamic compression loading is still to be determined.…”

Section: Introductionmentioning

confidence: 99%

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Frequency-related viscoelastic properties of the human incisor periodontal ligament under dynamic compressive loading

Zhao

et al. 2020

PLoS ONE

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Studies concerning the mechanical properties of the human periodontal ligament under dynamic compression are rare. This study aimed to determine the viscoelastic properties of the human periodontal ligament under dynamic compressive loading. Ten human incisor specimens containing 5 maxillary central incisors and 5 maxillary lateral incisors were used in a dynamic mechanical analysis. Frequency sweep tests were performed under the selected frequencies between 0.05 Hz and 5 Hz with a compression amplitude that was 2% of the PDL’s initial width. The compressive strain varied over a range of 4%-8% of the PDL’s initial width. The storage modulus, ranging from 28.61 MPa to 250.21 MPa, increased with the increase in frequency. The loss modulus (from 6.00 MPa to 49.28 MPa) also increased with frequency from 0.05 Hz– 0.5 Hz but remained constant when the frequency was higher than 0.5 Hz. The tan δ showed a negative logarithmic correlation with frequency. The dynamic moduli and the loss tangent of the central incisor were higher than those of the lateral incisor. This study concluded that the human PDL exhibits viscoelastic behavior under compressive loadings within the range of the used frequency, 0.05 Hz– 5 Hz. The tooth position and testing frequency may have effects on the viscoelastic properties of PDL.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Frequency-related viscoelastic properties of the human incisor periodontal ligament under dynamic compressive loading

Zhao

et al. 2020

PLoS ONE

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“…Furthermore, this method may be a good model for fluid exudation in tension due to Poisson effects, particularly in a highly anisotropic tissue. Recent studies investigating dynamic tensile function have also demonstrated heterogeneity in PDL viscoelastic properties with root level but not between mesial and distal surfaces (Uhlir et al, 2017;Wu et al, 2019Wu et al, , 2018. Our data consistently also showed limited differences between the mesial and distal surfaces, but instead demonstrated large variability in bucco-lingual properties, which to our knowledge has not been measured in previous studies.…”

Section: Resultssupporting

confidence: 80%

In situ AFM-based nanoscale rheology reveals regional non-uniformity in viscoporoelastic mechanical behavior of the murine periodontal ligament

Connizzo

Samorodnitzky-Naveh

2020

Journal of Biomechanics

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The periodontal ligament (PDL) is a critical player in the maintenance of tooth health, acting as the primary stabilizer of tooth position. Recent studies have identified two unique regions within the PDL, the 'dense collar' region and the 'furcation' region, which exhibit distinct structural and compositional differences. However, specific functional differences between these regions have yet to be investigated. We adapted an AFM-based nanoscale rheology method to regionally assess mechanical properties and poroelasticity in the mouse PDL while minimizing the disruption of the 3-dimensional native boundary conditions, and then explored tissue mechanical function in four different regions within the dense collar as well as in the furcation region. We found significant differences between the collar and furcation regions, with the collar acting as a stabilizing ligamentous structure and the furcation acting as both a compressive cushion for vertical forces and a conduit for nutrient transport. While this finding supports our hypothesis, based on previous studies investigating structural and compositional differences, we also found surprising inhomogeneity within the collar region itself. This inhomogeneity supports previous findings of a tilting movement in the buccal direction of mandibular molar teeth and the structural adaptation to prevent lingual movement. Future work will aim to understand how different regions of the PDL change functionally during biological or mechanical perturbations, such as orthodontic tooth movement, development, or aging, with the ultimate goal of better understanding the mechanobiology of the PDL function in health and disease.

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“…Using the tangent of the phase angle, termed the loss factor tanδ, as a measurement of the damping capacity of materials, [ 27 ] we found that the measured average loss factor of the PIL (tanδ ≈ 0.053 ± 0.008) was approximately five times higher than that of the non‐modified Ti substrate (0.009 ± 0.0010) at a variety of frequencies (Figure 2c). The value of tanδ also approached that of natural PDL over a wide range of frequencies (e.g., the tanδ of human PDL is ≈0.078–0.13 at 0.5–10 Hz, [ 28 ] and bovine PDL is ≈0.04–0.08 at 0.01–100 Hz). [ 14 ] Further, the average tanδ value of amorphous titania (0.012 ± 0.002) substantially exceeded that of crystalline titania (0.004 ± 0.002) at 1–100 Hz (Figure S14a, Supporting Information).…”

Section: Resultsmentioning

confidence: 88%

An Amorphous Peri‐Implant Ligament with Combined Osteointegration and Energy‐Dissipation

et al. 2021

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Progress toward developing metal implants as permanent hard‐tissue substitutes requires both osteointegration to achieve load‐bearing support, and energy‐dissipation to prevent overload‐induced bone resorption. However, in existing implants these two properties can only be achieved separately. Optimized by natural evolution, tooth‐periodontal‐ligaments with fiber‐bundle structures can efficiently orchestrate load‐bearing and energy dissipation, which make tooth–bone complexes survive extremely high occlusion loads (>300 N) for prolonged lifetimes. Here, a bioinspired peri‐implant ligament with simultaneously enhanced osteointegration and energy‐dissipation is presented, which is based on the periodontium‐mimetic architecture of a polymer‐infiltrated, amorphous, titania nanotube array. The artificial ligament not only provides exceptional osteoinductivity owing to its nanotopography and beneficial ingredients, but also produces periodontium‐similar energy dissipation due to the complexity of the force transmission modes and interface sliding. The ligament increases bone–implant contact by more than 18% and simultaneously reduces the effective stress transfer from implant to peri‐implant bone by ≈30% as compared to titanium implants, which as far as is known has not previously been achieved. It is anticipated that the concept of an artificial ligament will open new possibilities for developing high‐performance implanted materials with increased lifespans.

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Viscoelastic properties of human periodontal ligament: Effects of the loading frequency and location

Cited by 18 publications

References 19 publications

Frequency-related viscoelastic properties of the human incisor periodontal ligament under dynamic compressive loading

Frequency-related viscoelastic properties of the human incisor periodontal ligament under dynamic compressive loading

In situ AFM-based nanoscale rheology reveals regional non-uniformity in viscoporoelastic mechanical behavior of the murine periodontal ligament

An Amorphous Peri‐Implant Ligament with Combined Osteointegration and Energy‐Dissipation

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