1. Classification and Nomenclature of Periodontal Diseases;Orban;J. Periodont.,1942
2. Report of Nomenclature Committee;J.A.D.A.,1943
3. Report of Nomenclature Committee;J. Periodont.,1943
4. This holds true even if systemic factors are indirectly responsible. Calculus is a direct and local cause for gingivitis though systemic factors may be responsible for the quantity and quality of the calculus.
5. Diffuse Atrophy of the Alveolar Bone;Orban;J. Periodont.,1942