Columbia University School of Dental and Oral Surgery - Dental Columbian Yearbook (New York, NY)

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LEWIS R. STOWE D.D.S. Associate Prof, of Dentistry SOLOMON N. ROSENSTEIN B.S.. D.D.S. Assistant Prof, of Dentistry fT V- • ».•: EDWARD V. ZEGARELLI M.S., D.D.S. Instructor in Dentistry ORAL DIAGNOSIS DANIEL E. ZISKIN, D.D.S. Associate Prof, of Dentistry HAROLD J. LEONARD D.D.S. Professor of Dentistry Under the auspices of this department much interesting research work has been carried on. The effect of early thyro-parathyroidectomy on dental and skeletal development of rats was studied. It was found that there was a severe and general retardation of growth and development. Specifically there occurred a reduction of about one-half in the weights of the mandibles of new born and 7th day operated animals. The area of the dental arch was reduced about one-half in these animals. Eruption time, dentin and root development were retarded in the thyro-parathyroidectomized animals. The effects of castration and hypophysectomy on the gingivae and oral mucous membranes of Rhesus monkeys were also studied. It was found that castration of female rhesus monkeys causes, chiefly, alteration of the arrangement of the prickle cell layer of the alveolar and areolar gingivae, and tissue degeneration. Castration of male rhesus monkeys causes changes in the gingivae and oral mucous membranes resembling the effects of injec- tions with the estrogenic hormones; namely, hyperkeratinization. At present the members of the department are engaged in studies on hyperplasia of the gingivae associated with the use of dilantin in the treat- ment of epileptics. DANIEL E. ZISKIN, D.D.S. (ESSE L. LEFC.OURT U.S.. D.D.S. Clinical Assistant [AMES ■. CUNNINGHAM B.S., D.D.S. Assistant in Dentistry JOSEPH A. C ' .l ' T ' I ITA A.B., D.D.S. Assistant in Dentistry

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H. RR A. VOL ' NG DJJ.S. Assistant Prof, of Dentistry |()HN F. RALSTON D.D.S. Issistant Prof, of Dentistry DONALD |. W. McLAUGH] IN D.D.S. Assistant Prof, of Dentistry GILBERT P. SMITH D.D.S. Assistant Prof, of Dentistry MORELL D. McKENZIE D D.S. Instructor in Dentistry HENRY J IN EM ANN A.B.. D.D.S. Instructor in Dentistry HAROLD S. WOODRUFF D.D.S. Instructor in Dentistry NORMAN W. BOYD B.S., D.D.S. Assistant in Dentistry WILLIAM C. WOHLFARTH Ph.B.. D.D.S. Assistant in Dentistry GERARD L. COIRTADE A.B.. D.D.S. Assistant in Dentistry HAROLD J. ZERR A.I!.. D.D.S. Assistant in Dentistry

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OR THODONTICS It lias been established by previous investigations that the influence of orthodontic treatment is not confined to the alveolar process but ex- tends to other parts of the skull, e.g. the mandibular condyle, the glenoid fossa, the ramus and the body and the angle of the mandible. Judicious control of such bone changes which are produced by different orthodontic means seems essential to the obtaining of favorable esthetic results from the treatment of many malocclusions. Thus, Orthodontic procedure develops into orthopedics or, more specifically, orthognatics. Clinical observation and the experimental findings of several authors justify the assumption that the vertical dimension cannot be increased permanently by ordinary orthodontic procedure but is constant in a given individual at a certain stage of development. This distance is probably the result of a balance between the length of the masticatory muscles and the bone. (Since the length of muscles is orthodontically practically unalterable, permanent increase of the vertical dimension cannot be attained by such means.) Proceeding from this basic knowl- edge we may attempt to produce permanent changes in the bony parts of the masticatory apparatus via intermediate changes in the vertical dimension. If we, for instance, raise the bite in one region or another, corresponding bone changes will take place, demonstrating nature ' s intention eventually to reestablish the original vertical dimension. While the depression of the teeth alone would be of slight benefit, and then only in a limited number of cases, the other bone changes leading to the final reestablishment of the original vertical dimension may be of great desirability in the correction of malocclusions and abnormal facial contours. It is the ability to control conscientiously these described bone changes which we hope to attain. LEUMAN M. WAUCH, D.D.S. LEUMAN M. WATCH, D.D.S. Professor oj Dentistry (t toi GEORGE S. CALLOWAY DOS. Associate Prof, of Dentistry m jA HARRY A. GALTON D.D.S. Instructor in Dentistry LEWIS E [ACKSON HENRY U. BARBER, Jr. EDWARD G. MURPHY ARTHUR C. TOTTEN DONALD B. WAI (.11 D.D.S. D.D.S. D.D.S. D.D.S. D.D.S. Instructor in Dentistry Assistant Prof, of Dentistry Assistant Prof, of Dentistry Assistant Prof, of Dentistry Instructor in Dentistry