Tensile creep mechanical behavior of periodontal ligament: A hyper-viscoelastic constitutive model

Zhou, Jinlai; Song, Yang; Shi, Xue; Zhang, Chunqiu

doi:10.1016/j.cmpb.2021.106224

Cited by 14 publications

(4 citation statements)

References 43 publications

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“…As the NVB is stretched and held at a constant length, the internal (molecular) structure of the material is reconfigured, resulting in a reduction of stress until a plateau is achieved 11,12 . The viscoelastic behaviour demonstrated by our sample is similar in characteristics to the mechanical properties of the PDL, as they both exhibit a time‐dependent non‐linear response to applied forces 23–25 . This is to be expected as both are made up of malleable collagen fibres that do not undergo instant deformation, as seen in purely elastic materials 8,23 .…”

Section: Discussionmentioning

confidence: 66%

“…11,12 The viscoelastic behaviour demonstrated by our sample is similar in characteristics to the mechanical properties of the PDL, as they both exhibit a time-dependent non-linear response to applied forces. [23][24][25] This is to be expected as both are made up of malleable collagen fibres that do not undergo instant deformation, as seen in purely elastic materials. 8,23 We also noticed some variability of Young's modulus in both the NVB from our study and the PDL studies within the literature.…”

Section: Re Sultsmentioning

confidence: 95%

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Tensile forces in the neurovascular bundle: A contributor to orthodontic relapse?

Oki,

Yamakawa,

Paranjapye

et al. 2023

Orthod Craniofacial Res

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ObjectivesThe aim of this study is to investigate the neurovascular bundle (NVB) as a potential orthodontic relapse factor. The mechanical properties and the forces generated in the NVB after orthodontic extrusion are explored.Materials and MethodsSix NVBs branching from the inferior alveolar nerve to the apices of the mandibular canines and premolars of mature pigs were harvested. Stress relaxation tests were conducted. A standard linear solid model (SLS) was utilized to simulate the orthodontic extrusion of a single rooted tooth with NVB length and cross‐sectional diameter of 3.6 and 0.5 mm, respectively, so the NVB was stretched 10% and 20% of its original length. The maximum force within the NVB was then calculated.ResultsBased on our data, the average Young's modulus before relaxation (), after relaxation () and the difference between Young's moduli before and after relaxation () were 324 ± 123, 173 ± 73 and 151 ± 52 kPa, respectively. The theoretical force within the NVB stretched to 10% and 20% strain was 3 and 5 mN, respectively.ConclusionThe data from our study indicate that the NVB exhibits stress relaxation, a characteristic trait of viscoelastic materials. SLS model simulation predicted residual forces around 5 mN for elongation up to 20%. We observed strain hardening with additional elongation, which has the potential to cause forces to increase exponentially. Therefore, tensile forces in the NVB should not be ruled out as a contributor to orthodontic relapse, especially in adult patients who may have decreased adaptability of their NVB. Further preclinical and clinical models should be developed to further clarify what is the contribution of the NVB to orthodontic relapse.

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Section: Discussionmentioning

confidence: 66%

Section: Re Sultsmentioning

confidence: 95%

Tensile forces in the neurovascular bundle: A contributor to orthodontic relapse?

Oki,

Yamakawa,

Paranjapye

et al. 2023

Orthod Craniofacial Res

View full text Add to dashboard Cite

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“…In this regard, the latter observation provides a basis for further ex vivo studies of either cementum alteration under certain conditions or efficacy of dental treatments on recovery of the natural roughness parameters. Besides, the closeness in the roughness of different anatomical parts of root cementum may lead to simplification of the cementum-periodontal ligament interface mathematical models [49,50].…”

Section: Discussionmentioning

confidence: 99%

Nanoindentation and Atomic Force Microscopy Derived Mechanical and Microgeometrical Properties of Tooth Root Cementum

Sadyrin

Lapitskaya

Kuznetsova

et al. 2022

Micro

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In the present research, nanoindentation, atomic-force microscopy and optical microscopy were used to study the mechanical and microgeometrical parameters of tooth tissues. A nanoindentation test unit equipped with Berkovich indenter was used to determine the values of the reduced Young’s modulus and indentation hardness and both nanoindentation and atomic force microscopy using a diamond probe on a silicon cantilever were used to study microgeometrical parameters of human tooth root cementum. Three areas of cementum were studied: the cervical region near the dentine–enamel junction, the second third of the tooth root, and the apex of the tooth root. The interpretation of the results was carried out using the Oliver–Pharr method. It was established, that the mechanical properties of cementum increase from the cervical region to the central part of the root, then decrease again towards the apex of the tooth root. On the contrary, the microgeometrical characteristics of cementum practically do not demonstrate any change in the same direction. A decrease in the roughness parameters in the direction from cellular cementum to dentine was observed. Additionally, a decrease in the reduced Young’s modulus and indentation hardness of dentine in the cervical area compared to dentine in the crown part of the tooth was found using nanoindentation. The investigation of the dentine–cementum junction with high resolution revealed the interspaced collagen fiber bridges and epithelial rests of Malassez, whose sizes were studied. The parameters of the topographic features of the cementum in the vicinity of the lacunae of cementocytes were also established.

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“…The Ogden 3rd model and normalized-based relaxation function regarded PDL as a nonlinear material with both super-elasticity and viscoelasticity as previously reported [ [18] , [19] , [20] ] ( Table 1 , Table 2 , Table 3 ). And parameters of the Ogden 3rd model mainly refer to a previous article [ 21 ]. A PDL model with a thickness of 0.25 mm was then created through Boolean operation.…”

Section: Methodsmentioning

confidence: 99%

An in vivo evaluation of clear aligners for optimal orthodontic force and movement to determine high-efficacy and periodontal-friendly aligner staging

Wang¹,

Chen²,

Qin³

et al. 2023

Heliyon

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Tensile creep mechanical behavior of periodontal ligament: A hyper-viscoelastic constitutive model

Cited by 14 publications

References 43 publications

Tensile forces in the neurovascular bundle: A contributor to orthodontic relapse?

Tensile forces in the neurovascular bundle: A contributor to orthodontic relapse?

Nanoindentation and Atomic Force Microscopy Derived Mechanical and Microgeometrical Properties of Tooth Root Cementum

An in vivo evaluation of clear aligners for optimal orthodontic force and movement to determine high-efficacy and periodontal-friendly aligner staging

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