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. 2017 Nov 7;17:151. doi: 10.1186/s12871-017-0442-z

Fig. 4.

Fig. 4

Schematic drawing showing the force, F, as the laryngoscope blade contacts the tooth of length. The blade produces tension (stretch) on one side of the tooth and compression on the other side. The amount of tension and compression are measured by strain gauges glued to each side of the tooth