Evaluation of the 1999 and 2018 Periodontal Disease Classifications: a Retrospective Study

Inclusion Criteria

• •Patients with a complete periodontal chart and full mouth radiographic series at baseline
• •Diabetes Mellitus:Patients who consulted by an internist/endocrinologist and underwent HbA1c measurements in the last three months.
• •Smoking status:All current smokers who had smoked more than 100 cigarettes in their lifetimes and used cigarettes for more than five years
• •Patients meeting the case definition of periodontitis
• •Relative radiographic bone loss(in %) was assessed on peri-apical radiograph films