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An evaluation of external apical root resorption after orthodontic treatmentThomas, Elizabeth 19 January 2012 (has links)
Root resorption is a common problem encountered in all branches of dentistry but is more commonly seen in cases that had been treated orthodontically. Orthodontists are constantly improving materials and techniques to reduce undesirable side effects like root resorption. Therefore in this retrospective study the primary objective was to compare the amount of root resorption observed after active orthodontic treatment with three different appliance systems namely, Tip Edge, Modified Edgewise and Damon. The sample consisted of pre and post-treatment cephalograms of sixty eight cases that were treated in three different groups (i.e., techniques). Root resorption of the maxillary central incisor was assessed from pre- and post- treatment lateral cephalograms using two schemes. In the first method overall tooth length (Black, 1902) from the incisal edge to the apex was measured on both pre and post-treatment lateral cephalograms and root resorption was recorded as an actual millimetre loss of tooth length. Percentage shortening per tooth was also recorded.
The results were subjected to various statistical analyses. There was a significant upward linear trend (p=0.022) for root resorption from Group 1 (Tip Edge) to Group 3 (Damon). Statistical modeling illustrated that only baseline length (pre-treatment incisor length) was a significant confounder. Gender, race, age and treatment time did not have a significant influence on the amount of root resorption seen after orthodontic treatment. In the final analysis after having adjusted for baseline length it was found that there were no significant differences (p=0.133; ANCOVA) in the degree of root resorption observed after the active phase of orthodontic treatment between groups. Similarly the percentage of root resorption calculated did not differ significantly between groups (p=0.067). The result was also confirmed by following a non-parametric approach by doing an analysis of covariance (ANCOVA) in which data was allocated a rank value.
In the second method root resorption was visually evaluated by using the five grade ordinal scale of Levander and Malmgren (1988). It was found that majority of cases in the sample came under Grade1 and Grade 2 category of root resorption. The upward linear trend between actual measurements and visual measurements was found to be statistically significant (p=0.0183).
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The reattachment of free gingival autografts to the root surfacesSaid, Yousri Z. January 1976 (has links)
Thesis (D.Sc.D.)-- - Boston University School of Graduate Dentistry, 1976 (Periodontology). / Bibliography included.
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INFLUENCE OF CHEMICAL AND PHYSICAL FACTORS ON SPORULATION OF PHYMATOTRICHUM OMNIVORUM (SHEAR) DUGGARBaniecki, John F. (John Ferdinand), 1938- January 1969 (has links)
No description available.
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Histochemistry and enzyme activity of resistant and susceptible cotton infected by Meloidogyne incognitaNoel, Gregory Ross, 1947- January 1972 (has links)
No description available.
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The hemoglobin of leguminous root nodulesLittle, Henry Nelson, January 1948 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1948. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [30-32]).
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Dynamics and architecture of fine root system in a Cryptomeria japonica plantation / スギ人工林における細根系の動態と構造 / スギ ジンコウリン ニオケル サイコンケイ ノ ドウタイ ト コウゾウ田和 佑脩, Yusuke Tawa 07 March 2019 (has links)
博士(理学) / Doctor of Philosophy in Science / 同志社大学 / Doshisha University
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Theological implications of kbš and rdh in Genesis 1:28Cox, Joseph E. January 1987 (has links)
Thesis (M.A.)--Denver Conservative Baptist Seminary, 1987. / Includes bibliographical references (leaves 85-90).
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Evaluation of the sealer film mass in obturated root canals using the electron scanning microscopeCarter, Geoffrey J. January 1974 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1974. / Typescript (photocopy). Includes bibliographical references (leaves 30-31). Also issued in print.
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A comparison of apical versus coronal seal a thesis submitted in partial fulfillment ... endodontics /Tichenor, William J. January 1978 (has links)
Thesis (M.S.)--University of Michigan, 1978.
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A triated thymidine study of the developing root in rhesus monkeys a thesis submitted in partial fulfillment ... periodontics ... /Kenney, Ernest Barrie. January 1967 (has links)
Thesis (M.S.)--University of Michigan, 1967.
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