81 Determination of intra-oral surface areas Fig. 1 Schematic illustration of human head with all the anthropometric measurements used in this study. Each number indicates a different proportion, Table 1 for the exact definitions; length of the head (I), width of the head (II), depth of the head (III), face height (IV), lower face height (V), nose height (VI), width of the mouth (VII), upper face height (VIII), upper lip height (IX), mandible height (X) and tragus–gnathion distance (XI). 4
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