Effects of age on the stress–strain and stress–relaxation properties of the rat molar periodontal ligament

Komatsu, Koichiro; Kanazashi, Mikimoto; Shimada, Akemi; Shibata, Tatsuya; Viidik, Andrus; Chiba, M.

doi:10.1016/j.archoralbio.2004.04.002

Cited by 29 publications

(36 citation statements)

References 29 publications

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“…The viscoelastic behavior has been examined in creep and stress-relaxation tests with quasi-static experimental set-ups. 12,13,18 These experiments have provided valuable information on the apparent resistance to deformation in relation to the strain-rate, and on stress distribution. With quasi-static experimental set-ups, however, the frequency dependent viscoelastic behavior relevant for energy dissipation is disregarded.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Dynamic Shear Properties of the Porcine Molar and Incisor Periodontal Ligament

et al. 2006

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The role of the periodontal ligament (PDL) is to support the tooth during function and resist external forces applied to it. The dominant vertical component of these forces is associated with shear in the PDL. The mechanical response to vertical force may, however, be different between the molar and incisor as their loading regimen is different. The present study was designed to determine the viscoelastic behavior in shear of the PDL of the porcine molar and incisor (n = 10 for each). From dissected mandibles transverse sections including the mesial root of first molar and the incisal root were obtained and used for dynamic shear tests. Shear strain of 1.0% was applied in superoinferior direction parallel to the root axis with a wide range of frequencies (0.01-100 Hz). The viscoelastic behavior was characterized by the storage and loss modulus and loss tangent as a function of the frequency. For the incisor and molar, the complex and storage moduli increased significantly with the frequency. For the incisor, the loss modulus also increased with the frequency. The loss modulus and loss tangent were significantly (p < 0.05) larger in the incisor than in the molar. The present results suggest that the incisal PDL revealed more viscous behavior during dynamic shear than the molar one, which might have important implications for the principal role of the anterior teeth such as PDL sensation.

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Section: Introductionmentioning

confidence: 99%

Comparison of Dynamic Shear Properties of the Porcine Molar and Incisor Periodontal Ligament

et al. 2006

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“…This would reduce the risk of injury to the PDL in the case of prolonged static deformation (Fung, 1981;Kwan et al, 1993;Tanaka et al, 1999;Provenzano et al, 2001;Sanctuary et al, 2005;Shibata et al, 2006). The stress-relaxation, one of viscoelastic responses, of the rat PDL during 10 min reaches about 50% (Komatsu et al, 2004a), which is greater than those of other soft connective tissues. Such viscoelastic response should play a role in the tooth support mechanism of the PDL.…”

Section: Introductionmentioning

confidence: 96%

“…Such viscoelastic response should play a role in the tooth support mechanism of the PDL. Methods of stress-relaxation test of the PDL and the analysis have previously been established (Komatsu et al, , 2002a(Komatsu et al, , 2004aToms et al, 2002;Sanctuary, 2003;Natali et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Analysis of contribution of collagen fibre component in viscoelastic behaviour of periodontal ligament using enzyme probe

Komatsu

Shibata

Shimada

2007

Journal of Biomechanics

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“…2 The maximum shear stress and stiffness of the rat molar periodontal ligament decrease with age. 3 In older animals the proliferative rate of periodontal ligament cells 4 and collagenous fibers 2 is reduced, and an elevation of the physiologic threshold against mechanical stress 5 and an inactivity of osteoblasts and osteoclasts occurs histologically. 6 Periodontal tissue, in particular the periodontal ligament, plays an important role in bone remodeling at the periodontal ligament-alveolar bone interface during orthodontic force application.…”

Section: Introductionmentioning

confidence: 99%

Alteration of bFGF expression with growth and age in rat molar periodontal ligament

Sako¹,

Hosomichi²

2010

The Angle Orthodontist

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Objective: To test the hypothesis that immunohistochemical changes in expression of basic fibroblast growth factor in the periodontal ligament do not change with age. Materials and Methods: Thirty male Wistar-ST rats were divided into growing groups (5, 9, and 15 weeks of age) and aging groups (6, 12, and 18 months of age). Serial sagittal sections (5 mm thick) were cut parallel at the distobuccal roots of the maxillary first molar. Paraffin-embedded tissue sections were stained with hematoxylin and eosin and rabbit polyclonal antibodies to basic fibroblast growth factor. Results: The number and the area of basic fibroblast growth factor-immunoreactive cells in the periodontal ligament of the maxillary first molar decreased with age. The number of basic fibroblast growth factor-immunoreactive cells was much greater in the root furcation area, which experiences the greatest effect of occlusal force. Regardless of age, the production of basic fibroblast growth factor in the periodontal ligament may occur subject to functional demand. Conclusions: The hypothesis is rejected. The expression of basic fibroblast growth factor in the periodontal ligament decreased with age. (Angle Orthod. 2010;80:904-911.)

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Effects of age on the stress–strain and stress–relaxation properties of the rat molar periodontal ligament

Cited by 29 publications

References 29 publications

Comparison of Dynamic Shear Properties of the Porcine Molar and Incisor Periodontal Ligament

Comparison of Dynamic Shear Properties of the Porcine Molar and Incisor Periodontal Ligament

Analysis of contribution of collagen fibre component in viscoelastic behaviour of periodontal ligament using enzyme probe

Alteration of bFGF expression with growth and age in rat molar periodontal ligament

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