Solow, 1967, Tallgren 1977, Posnick 1978, and Showfety 1987 mentioned the fact that extension of the head had been associated to increase of the anterior-posterior maxillary-mandibular dimension, as well as increase in the anterior facial height.
Solow, 1967; Tallgren, 1977; Posnick, 1978; Showfety, 1987; mencionan que la extensión de la cabeza se ha correlacionado con el aumento de la dimensión maxilomandibular anteroposterior y aumento en la altura facial anterior.