The children were guided into placing the mandible in a comfortable position, they were then asked to open the mouth to their utmost might, without causing pain. The digital vernier caliper ridge was located at the incisive edge of the upper central incisor which was in the most vertical position. At that point, distance between this tooth and the incisive edge of the lower incisor was measured inter-incisive distance.
Se le guío al escolar a colocar la mandíbula en una posición cómoda, posteriormente se le indicó abrir la boca lo más grande que pudiera, sin que le causara molestia; se ubicó el borde de vernier digital pie de metro en el borde incisal del incisivo central superior que estaba más vertical, y se midió la distancia entre este y el borde incisal del incisivo inferior, distancia interincisal.