Protection of the upper teeth is one of the important factors in the technic to be observed during a bronchoscopic or esophagoscopic examination. There have been numerous occurrences of injury to the upper teeth, regardless of what instrument or method has been employed.
Unless the teeth have been properly protected, patients frequently complain of sensitiveness or tenderness of the teeth, particularly on the edges, lasting for several days after a bronchoscopic or esophagoscopic examination, as a result of the pressure of the metal tube, which rests on the edges of the teeth.
Heretofore to protect the upper teeth from injury by the bronchoscopic or esophagoscopic tube it has been the accepted custom to use the examiner's thumb or a pad of gauze or cotton. Neither of these measures is completely satisfactory. When the thumb of one hand is used, that hand is eliminated
Israel S. DEVICE FOR PROTECTION OF THE TEETH DURING BRONCHOSCOPY AND ESOPHAGOSCOPY. JAMA. 1935;104(6):462–463. doi:10.1001/jama.1935.92760060003007b
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