Esthetic principles in prosthetic dentistry. 
Dento-facial esthetics represents today the fourth clinical dimension in our activity.  Together with morphological, functional and biomechanical factors, aesthetics contribute to a successful clinical result in prosthodontics.  Dento-facial esthetics takes over the visual perception principles adapting them to dental requirements.  Continuously assimilating esthetics information, being a good observer and training visual perception is important for the final complete result in prosthetic dentistry.