1. Glossary of prosthodontic terms;Academy of Prosthodontics;J Prosthet Dent,2005
2. The global burden of oral diseases and risks to oral health;Petersen;Bull World Health Org,2005
3. A new method of classifying prognostic co-morbidity in longitudinal studies: development and validation;Charlson;J Chron Dis,1987
4. 4. Healthy People 2010, Volume ii, Section 21, Oral Health. Available at http://www.healthypeople.gov/Publications; pp 21-18 to 21-19, accessed November 25, 2008