“…However, values conventionally adopted as representative of normality not always can be used indistinctly, given that variation due to growth and craniofacial development are characteristic of different organisms. 11 The normal mandibular growth tend to increase the SNB, with greater progress attributed to point B, since the point N does not progresses with the same intensity, altering the geometric relation of the line NB with the long axis of the lower incisor, with artificial reduction of 1.NB and 1-NB. Therefore, the IMPA presents more reliable value for the analysis of the lower incisor position, since it experiences less diScuSSion…”