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ClinicalTrials.gov Identifier: NCT01676545
Recruitment Status : Unknown
Verified August 2012 by Shanghai Stomatological Disease Center. Recruitment status was: Active, not recruiting
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Ages Eligible for Study:
35 Years and older (Adult, Older Adult)
Sexes Eligible for Study:
All study subjects will be selected from a pre-existing patient database in Shanghai. All chronic periodontitis cases and controls will be subjects who were at least 35 years old at time of enrollment.
Classification of chronic periodontitis will be based on the extent of periodontal tissue destruction with consideration of tooth loss.
- To be included in this study, an individual needs to be Han Chinese of 35 years of age or older at time of enrollment.
- 1) Age younger than 35 years old. 2) Patients with diagnosis of rheumatoid arthritis, psoriasis, inflammatory bowel disease, glomerulonephritis/kidney disease, cancer, or Sjogren's syndrome.