Viscoelastic Response of the Periodontal Ligament: An Experimental–Numerical Analysis

Natali, Arturo N.; Pavan, Piero G.; Carniel, Emanuele Luigi; Dorow, Christina

doi:10.1080/03008200490885742

Cited by 94 publications

(90 citation statements)

References 15 publications

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“…Since then, FEM studies have been published about parameters that may influence orthodontics associated stress magnitudes and their patterns. Most are technical studies of PDL mechanical properties, including its linear/non-linear (Cattaneo et al, 2005), isotropic/anisotropic (Provatidis, 2000), and viscoelastic behaviors (Krstin et al, 2002;Natali et al, 2004), and the absence/presence of principal PDL fibers (Qian, Chen & Katona, 2001). Studies have also looked at the role of bone heterogeneity (Cattaneo et al, 2005).…”

Section: The Three-dimensional Mechanical Environment Of Orthodontic mentioning

confidence: 99%

Orthodontic mechanotransduction and the role of the P2X7 receptor

Viecilli

Katona

Chen

et al. 2009

American Journal of Orthodontics and Dentofacial Orthopedics

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DEDICATIONTo my parents, who have supported my education. iv ACKNOWLEDGMENTSOne of the most important things I have learned during my PhD is the necessity of the existence of a working network of people that can help you achieve your goals. The more effectively this network functions, the higher the chance you will achieve the goals quickly.I would first like to thank my parents, who have unconditionally supported my decision to abandon a profitable private practice in Orthodontics, and return to humble student conditions while aiming for a full time academic career.I also thank my girlfriend Laura Kruter who has (almost always) been ok with my, some might say, not very sane ideas. Sometimes they do turn out fine, though (like this "PhD" one).I can hardly think of anyone else that could have complemented my work and ideas during this Program as well as Dr. Thomas Katona. While I was passionately conditioned to an idea, he was always rational and careful. While I was sometimes furious with a shortcoming, he was always temperate and humorous. When I ran into his office with some news about a project, he would always listen and almost never seem too busy to see me. While I was working and something went wrong, he would listen and wonder with me about the "whys" and "hows", instead of telling me what to do or express disappointment. He was even subject to some of my home culinary experiments. I was extremely fortunate to find someone that thought about science the same way I did, and that actually helped me with my project instead of just telling me what to do. I felt like we worked as a team, and that helped to increase my motivation during my studies. The third part of this project tested the role of the P2X7 receptor in the dentoalveolar morphology of C57B/6 mice. P2X7R KO (knockout) mice were compared to C57B/6 WT to identify differences in a maxillary molar and bone. Tooth dimensions viii were measured and 3D bone morphometry was conducted. No statistically significant differences were found between the two mouse types. P2X7R does not have a major effect on alveolar bone or tooth morphology.The final part examines the role of the P2X7 receptor in a controlled biomechanical model. Orthodontic mechanotransduction was compared in wild-type (WT) and P2X7R knock-out (KO) mice. Using Finite Element Analysis, mouse mechanics were scaled to produce typical human stress levels. Relationships between the biological responses and the calculated stresses were statistically tested and compared.There were direct relationships between certain stress magnitudes and root resorption and bone formation. Hyalinization and root and bone resorption were different in WT and KO. Orthodontic responses are related to the principal stress patterns in the PDL and the P2X7 receptor plays a significant role in their mechanotransduction.

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Section: The Three-dimensional Mechanical Environment Of Orthodontic mentioning

confidence: 99%

Orthodontic mechanotransduction and the role of the P2X7 receptor

Viecilli

Katona

Chen

et al. 2009

American Journal of Orthodontics and Dentofacial Orthopedics

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“…3 In other words, shows directional dependence in terms of stress and strain and has elements of elastic recovery and flow deformation. I would add that the periodontal ligament fibres can be perhaps also likened to a series of springs and thus could be mimicked by Hooke's spring laws.…”

Section: New Twist To An Old Storymentioning

confidence: 99%

New twist to an old story

Loudon¹

2013

Br Dent J

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“…The proposed values were intended to cover evenly already known values and also to investigate values which were not taken into account so far. The values of E1 and E2 were used in strain ranges below and over ε12=0.075 7) , respectively 17,18) . For the finite element method, a bilinear material was modeled using "multilinear elastic model option" which was included in the Ansys material library.…”

Section: Materials Propertiesmentioning

confidence: 99%

Bilinear elastic property of the periodontal ligament for simulation using a finite element mandible model

et al. 2011

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This study aimed to introduce a procedure for determining the bilinear elastic moduli (E1 and E2) of the periodontal ligament for a mathematical tooth model to analyse stress in the mandible. The bone and tooth morphology were scanned from a dry skull and an extracted intact tooth, respectively, and reconstructed in a three-dimensional finite element model. The model showed good agreement with previously reported in vivo premolar movement when an E1 for the first phase tooth movement of 0.05 MPa and an E2 for the second phase of 8.0 MPa with ε12 of 0.075 were adopted. The mandible model analysis indicated that a remarkably high maximum compressive stress in the cervical cortical bone and the tensile stress in areas of masticatory muscle attachment were found. Future stress analyses using a jaw model may follow the process of determination of bilinear moduli to enhance accurate simulation with less calculation time.

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Viscoelastic Response of the Periodontal Ligament: An Experimental–Numerical Analysis

Cited by 94 publications

References 15 publications

Orthodontic mechanotransduction and the role of the P2X7 receptor

Orthodontic mechanotransduction and the role of the P2X7 receptor

New twist to an old story

Bilinear elastic property of the periodontal ligament for simulation using a finite element mandible model

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