1. An evaluation of smiles before and after orthodontic treatment;Mackley;Angle Orthod,1993
2. Simulation of natural appearance;Kraijicek;J Prosthet Dent,1962
3. The dynesthetic interpretation of the dentogenic concept;Frush;J Prosthet Dent,1958
4. A new classification of human tooth forms with special reference to a new system of artificial teeth;Williams;Dent Cosmos,1914
5. The mandibular incisor—its role in facial esthetics;Wylie;Angle Orthod,1955