1. Wheeler's atlas of tooth form;Ash,1984
2. Esthetics of anterior fixed prosthodontics;Chiche,1994
3. An analysis of selected normative tooth proportions;Gillen;Int J Prosthodont,1994
4. Width/length ratios of normal clinical crowns of the maxillary anterior dentition in man;Sterret;J Clin Periodontol,1999
5. Bonded porcelain restorations in the anterior dentition: a biomimetic approach;Magne,2002