Thesis (M.S.)--University of Michigan, 1985.

Thesis (M.S.)--University of Michigan, 2000. / Includes bibliographical references.

Thesis (M. Cl. D.)--University of Western Ontario, 1997. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1985.

Thesis (M.S.)--University of Alberta, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Alberta, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M. Cl. D.)--University of Western Ontario, 1997. / Includes bibliographical references.

Thesis (M.D.S.)--University of Adelaide, Degree of Master of Dental Surgery, 1999. / Includes bibliographical references.

Indiana University-Purdue University Indianapolis (IUPUI) / A method was devised for the measurement and tabulation of load-deflection values for various wire spring configurations that are commonly used for orthodontic procedures. 1. The deflection of a simple cantilever varies as the third power of the length. 2. The incorporation of a helix into a cantilever at the area of maximum stress markedly increased the deflection. 3. The addition of a helix into a short lever produced a proportionately greater amount of deflection than did the addition of a helix into a long lever. 4. Under continued loading, the rate increased on all springs tested. 5. The load-deflection characteristic of a base arch is approximately the same as that of a simple cantilever. 6. Alteration of the spring height greatly affects the load-deflection values of the retraction springs. Reducing the spring height from 10 mm. to 8 mm., resulted in an increase of approximately 1.5 times as much force being delivered.

Indiana University-Purdue University Indianapolis (IUPUI) / The constructed cephalometric line sella-nasion minus seven degrees (SN-7°) has long been used as a substitute for the Frankfort horizontal in the descriptive analysis of orthodontic cases, due to the difficulty in locating anatomic porion. To eliminate this problem, the cephalostat was modified by replacing the original ear rods with hollow, cylindrically shaped shafts which permit the consistent visualization of anatomic porion. Location accuracy was tested by the double determination method. Then, using anatomic porion, the hypothesis that the constructed line SN-7° is an accurate and reliable substitute for Frankfort horizontal in the descriptive analysis of cases was tested. In an adult sample, the mean Frankfort horizontal - sella-nasion angle was 9.03° (S.D.=2.58) with a range of 2.0° to 17.5°. It was concluded that neither SN-7° nor any other constructed line is a reliable substitute for the Frankfort horizontal, due to the wide range of values determined. The mean Frankfort horizontal - mandibular plane angle was determined to test the hypothesis that when anatomic porion is utilized to construct the Frankfort horizontal, this angle is significantly different from that measured in other similar samples. The mean angle was 19.50° (S.D.=5.74) with a range of 8.0° to 35.5°. This value was significantly less than those determined for the Frankfort horizontal – mandibular plane angle in previous research.