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The auscultation-percussion diagnostic test for fractures of the mandible is presented. The presence of a fracture of the mandible can be determined by its properties as a sound conductor. A stethoscope is placed firmly over the symphysis, and then the areas over the right and left zygomas, condyles, and angles are struck lightly with a finger. The sound of the blow is conducted downward through the bony substance of the mandible. Since transmission of sound through dense bone is more efficient than through less dense soft tissue, any break in the bony column will result in a decrease in the transmission of the sound.
Comment is made on the simplicity and value of this diagnostic aid. The factors involved in its execution are discussed.
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© 1959 Published by Elsevier Inc.