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J Dent Res 31(3): 412-415, 1952
© 1952 International and American Associations for Dental Research
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THE EFFECT OF ALTERATIONS OF THE FACIAL MUSCULATURE ON THE FACIAL SKELETON AND DENTAL ARCH FORM OF THE RAT

A PRELIMINARY STUDY

SIDNEY L. HOROWITZ 1 and HARRY H. SHAPIRO 1

1 Research Division, School of Dental and Oral Surgery of the Faculty of Medicine, and Department of Anatomy, College of Physicians and Surgeons, Columbia University, New York, N. Y.

1. Portions of the lips and cheeks were removed in a number of 1-month-old rats.

2. A series of measurements of various skeletal dimensions was made on the dried skulls following sacrifice of the experimental and control groups at about four and one-half months of age.

3. Those animals in which the entire orbicularis oris muscle had been removed showed evidence of reduction in the dimensions of the nasal bones and premaxillary area as compared with the normal control group.

Submitted on March 19, 1952






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