The measurements of the free-way space (= distance between physiologic rest position and centric occlusion) vary according to the method used. In order to get a more distinct reference point, the authors suggest tattooing the Menton (lowest chin point) rather than the Pogonion (most anterior chin point). The free-way space measured in this study ranged from 0.5 to 8 mm. 75% of all cases examined revealed a free-way space between 1 and 2 mm and only 5% showed extreme values such as 0.5 and 8 mm. In contrast to Thompson, who believes that the vertical dimension of occlusion equals the vertical dimension in rest position minus 2 mm the results of this study are in agreement with the findings of those authors, who observed an individually great variation of the free-way space.
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Article Synopsis
- A new method for determining the physiologic rest position of the mandible involved using lip contact with a closed mouth and was compared to traditional techniques.
- The study found the median space between maxillary and mandibular front teeth in this lip contact position to be 1.53mm, which is between the conventional resting position (2.16mm) and the swallowing position (1.33mm).
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