Fig. 3

Measurements performed in the maxillary digital dental models: A Crown width/height proportion. The crown height measured from the gingival zenith to the incisal edge and crown width considered the maximum distance between the mesial and distal contact points; The width/height proportion was calculated after each value was recorded; B Mesiodistal dimension in the frontal view, with the occlusal plane parallel to the ground; C Crown angulation, measured using the occlusal plane and the long axis of the clinical crown; For D gingival and E incisal level between CI/LI and CI/C, a reference line was drawn parallelly to the occlusal plane and tangent to the most cervical portion of the gingival margin of the right central incisor was positioned. D Gingival level considered the distance between the reference line and the most cervical position of the gingival margin; E Incisal level was calculated using the distance between the reference line to the incisal edge of each tooth. Negative values indicated an apical position