1. Palato-gingivai grooves in maxillary incisors. A possible predisposing factor to localized periodontal disease;Lee;Br Dent J,1968
2. Thedisto-lingual groove in the maxillary lateral incisor; a periodontal hazard;Everett;J Periodontol,1972
3. Predictable endodontic and periodontal failures as a result of radicular anomalies;Simon;Oral Surg,1971
4. Advanced periodontal therapy;Prichard,1965
5. Pathways of the pulp;Cohen,1976