Material parameters and stress profiles within the periodontal ligament

Andersen, Kim Normann; Pedersen, Erik Helmer; Melsen, Birte

doi:10.1016/s0889-5406(05)81576-8

Cited by 95 publications

(73 citation statements)

References 34 publications

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“…By comparing measured and calculated movements, Andersen et al [1] determined for their finite element model their own linear set of parameters for the periodontal ligament. At 0.07 MPa, it was far below the value reported by Tanne and between the two Young's moduli determined in the present study.…”

Section: Diskussionmentioning

confidence: 99%

Determination of the Elasticity Parameters of the Human Periodontal Ligament and the Location of the Center of Resistance of Single-rooted Teeth

Poppe¹,

Bourauel²,

Jäger

2002

Journal of Orofacial Orthopedics/Fortschritte der Kieferorthop�

120

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Section: Diskussionmentioning

confidence: 99%

Determination of the Elasticity Parameters of the Human Periodontal Ligament and the Location of the Center of Resistance of Single-rooted Teeth

Poppe¹,

Bourauel²,

Jäger

2002

Journal of Orofacial Orthopedics/Fortschritte der Kieferorthop�

120

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“…However, it is still a challenge to accurately quantify 3D experimental variables such as root resorption and bone formation. It is known that the mechanical stimuli for orthodontic responses are the 3D distributed stresses/strains on the root and bone-PDL (periodontal ligament) interface (Andersen et al, 1991a;Andersen, Pedersen & Melsen, 1991b;Cattaneo, Dalstra & Melsen, 2005;Davidovitch, 1991;Fukui, 1993;Jones et al, 2001;Katona et al, 1995;Kawarizadeh et al, 2003a;Kawarizadeh et al, 2004;Krishnan & Davidovitch, 2006;Melsen, 1999;Melsen, 2001;Middleton, Jones & Wilson, 1996;Provatidis, 2002;Roberts, Goodwin & Heiner, 1981;Rygh, 1976;Toms et al, 2002;Wright & Yettram, 1979). Histology provides only 2D data and the results greatly depend on the choice of the representative sections, as well as choice of method of root resorption assessment.…”

Section: Introduction Orthodontic Tooth Movement Bone Response and Rmentioning

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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“…Location of the Crot has been studied over the years with numerous model systems; these studies include analytical models, direct measurement in vivo, 25 photoelastic technique, 21 strain gauge technique, 26 laser reflection technique 27 and holographic method, 23 etc. Although these model systems have provided some insight into the displacement characteristics of the tooth to apply forces, these studies have obvious limitations, such as: 1.…”

Section: Discussionmentioning

confidence: 99%

The Location of the Center of Rotation of the Maxillary Central Incisor during Stage III of the Begg Technique: A Finite Element Study

Faizee

Dhinahar

Gupta³

et al. 2012

JIOS

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Objective: To evaluate Stage III of the Begg technique using finite element method and to locate the center of rotation (Crot) during torquing and uprighting of the central incisor. Materials and methods:The maxillary central incisor was subjected to a finite element study. Movement of the tooth along the z-axis (labiolingual) and X-axis (mesiodistal) was noted. The Crot was located by finding the nodes which had zero displacement during the torquing and uprighting maneuvers. The location of Crot was also confirmed by the point of intersection of lines drawn along the long axis of the tooth between the initial and final positions after displacement.Results: This study revealed that the location of the Crot was 6.59 mm from the incisal edge (between the bracket slot and the cervical margin) during torquing maneuvers and 17.31 mm (between the apex and the middle third of the root) while uprighting the tooth. This is suggestive of a lack in control of the position of the crown during the third stage of Begg technique. Conclusion:Though the efficiency of torquing and uprighting in the Stage III of Begg technique was considered to be acceptable or satisfactory, it may be prudent to consider altering or effecting the Crot closer to the incisal edge for producing optimal result in Stage III.

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Material parameters and stress profiles within the periodontal ligament

Cited by 95 publications

References 34 publications

Determination of the Elasticity Parameters of the Human Periodontal Ligament and the Location of the Center of Resistance of Single-rooted Teeth

Determination of the Elasticity Parameters of the Human Periodontal Ligament and the Location of the Center of Resistance of Single-rooted Teeth

Orthodontic mechanotransduction and the role of the P2X7 receptor

The Location of the Center of Rotation of the Maxillary Central Incisor during Stage III of the Begg Technique: A Finite Element Study

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