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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
361

Simulations of mechanical adaptation and their relationship to stress bearing in skeletal tissue

Hirschberg, Jens January 2005 (has links)
[Truncated abstract] In this work a computer simulation program, similar to a finite element program, is used to study the relationship between skeletal tissue structure and function. Though other factors affect the shape of bone (e.g., genetics, hormones, blood supply), the skeleton adapts its shape mainly in response to the mechanical environment to which it is exposed throughout life. The specific relationship between the mechanical environment and the mechanical adaptation response of the skeleton is reviewed. Theories of mechanical adaptation are applied to the sites of tendon attachment to bone (entheses), the adaptation of generalised trabecular bone (i.e., Wolff’s Law of trabecular architecture), sesamoid bones that are often found where a tendon wraps around a bony pulley, and the internal trabecular structure of a whole bony sesamoid such as the patella. The relative importance of compression rather than tension in bone adaptation theories is still not fully understood. Some mechanical adaptation theories suggest that an overwhelming tensile stress at a skeletal location does not stimulate bone deposition, but would instead lead to bone resorption. The skeletal locations studied in this work were chosen because they have been proposed to be in tension. Computer simulations involving models are an ideal method to analyse the mechanical environment of a skeletal location. They are able to determine the mechanical stresses at, and the stress patterns around, complex biological situations. This study uses a two dimensional computer simulation program, Fast Lagrangian Analysis of Continua (Flac), to analyse the stress at the skeletal locations, and to test theories of mechanical adaptation over time by simulating physiological adaptation. The initial purpose of this study is to examine the stress in the skeletal tissue in generalised trabeculae, anatomical sites where a tendon wraps around a bony pulley, in the trabecular networks that fill the patella, and at tendon attachments. A secondary purpose, that follows directly from the first, is to relate the results of these initial stress analyses to existing and hypothetical skeletal tissue remodelling theories, to suggest how the complex skeletal structures might be generated solely in response to their mechanical environment. The term “remodelling” is used throughout this work to refer to mechanical adaptation of bone, usually at a surface of bone, rather than the internal regeneration of osteons (Haversion systems)
362

Modeling and rendering for development of a virtual bone surgery system

Niu, Qiang, January 2008 (has links) (PDF)
Thesis (Ph. D.)--Missouri University of Science and Technology, 2008. / Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed March 28, 2008) Includes bibliographical references (p. 146-154).
363

Changes resulting from Begg orthodontic treatment, with emphasis on the soft tissue profile /

Farrer, Steven. January 1984 (has links) (PDF)
Thesis (M.D.S.)--University of Adelaide, Dept. of Dentistry, 1985. / Some mounted ill. Includes bibliographical references (v. 1, leaves 206-227).
364

Silver doped hydroxyapatite coating on titanium surfaces and its effect on early bone response and osseointegration

Besu, Nicole, January 2007 (has links) (PDF)
Thesis (M.S.)--University of Tennessee Health Science Center, 2007. / Title from title page screen (viewed October 10, 2007). Research advisor: Joo L. Ong, Ph.D. Document formatted into pages (vi, 22 p. : ill.) Vita. Abstract. Includes bibliographical references (p. 23-32).
365

Bone properties and skeletal maturity in adolescent males as assessed by quantitative ultrasound

Braid, Sarah Anne. January 1900 (has links)
Thesis (M.S.)--Brock University, 2007. / Includes bibliographical references (leaves 123-135). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.
366

Human lead metabolism : chronic exposure, bone lead and physiological models /

Fleming, David E. B. January 1998 (has links)
Thesis ( Ph.D.) -- McMaster University, 1998. / Includes bibliographical references (leaves 237-246). Also available via World Wide Web.
367

Developing bone collagen stable hydrogen isotope analyses for paleoclimate research and enhancing interpretations with bone carbon, nitrogen and oxygen isotopes.

Cormie, Allison B. Schwarcz, Henry P. Unknown Date (has links)
Thesis (Ph.D.)--McMaster University (Canada), 1991. / Source: Dissertation Abstracts International, Volume: 53-11, Section: B, page: 5618. Supervisor: Henry P. Schwarcz.
368

Analysis of the variation of the oxygen isotopic composition of mammalian bone phosphate.

Stuart-Williams, Hilary le Quesne. Schwarcz, H.P. Unknown Date (has links)
Thesis (Ph.D.)--McMaster University (Canada), 1996. / Source: Dissertation Abstracts International, Volume: 57-10, Section: B, page: 6136. Adviser: M. J. McGlinchey.
369

In vitro three dimensional biomechanical comparison of two internal fixation methods in equine adult radii

Janicek, John Charles. January 2007 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2007. / "August 2007" The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Includes bibliographical references.
370

Phosphorus and the dairy cow : influence of intake level, source and stage of lactation on apparent digestibility and bone turnover /

Ekelund, Adrienne, January 2003 (has links) (PDF)
Diss. (sammanfattning). Uppsala : Sveriges lantbruksuniv., 2003. / Härtill 4 uppsatser.

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