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Craniotomy calipers designed for external measurement of the distance from an ear to the eye that is on the same side of the face. The normal distance between the chin and the nose (i.e., vertical occlusal dimension) for a given patient is then determined based on the anatomical correlation that has been found to exist between these two craniofacial features. These handheld instruments are frequently sturdy, metal or hard plastic with an L-shaped frame. They include a linear scale along the longer arm and a second L-shaped sliding arm that may include an auxiliary graduated scale to facilitate fine adjustment and to increase the accuracy of measurement. The results of the ear-eye distance are mainly used to predict chin-nose distance and determining occlusal vertical dimension in edentulous patients.
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