On 311 dental stone casts of living children aged from 8 to 12 years, were measured the lingual fossa depth, MD diameter, and the BL diameter of the permanent maxillary incisors. The correlations and the differences of measured variables between left and right incisors, centrals and laterals, male and female incisors as well as the correlations between measured variables themselves were analysed. High left-right symmetry was established, except for directional asymmetry in female centrals. A significant positive correlation in terms of positive allometry between the lingual fossa depth and MD diameter was found. In the light of these results, the significance of the lingual fossa depth as a factor of strength is discussed.