The facially driven smile design process should always start by defining the incised edge of the anterior upper teeth position, in harmony with the face and lip dynamics (fig 1, blue curve). After that, the most harmonious width relationship between teeth, arch and face should be defined, usually using the RED proportion (Recurring Esthetic Dental proportion) (fig 1, red lines). Only after the previous parameters are defined, one should define the width/length proportion of the central incisor and the ideal gingival position of the central incisors (fig 1, green rectangle). The ideal gingival curve definition will be related to the cervical of the central and the lip dynamics to help determine the hight of the gingiva towards the posteriors (fig 1, yellow curve).
Modern predictable Interdisciplinary Dentistry can only be achieved by linking the initial smile design project to the clinical procedures. Digital technology is the best way to create this link by producing devices to help the clinical performance and allowing for a quality control analysis. On crown lengthening cases this is achieved by transferring the ideal soft tissue position from the 3D digital world to the mouth using printing technology and a vacuum tray. The new double guide will help the soft tissue incision reducing the risk of mistakes and will also improve the bone level visualization when an open flap technique is the choice.