The aim of this study was to compare clinical as well as radiographic status of periodontal tissue of carious or badly restored teeth in comparison to healthy adjacent ones. A group of 50 individuals aged 20-50 years were selected from those referred to periodontics department at Shahid Beheshti Medical University for their periodontal complications including bleeding and recession. Clinical and radiographic examinations were performed on cases including Bleeding on Probing (BOP) pocket depth, attachment and bone loss level. All posterior teeth were looked at for presence of caries or faulty restorations. Similar number of cases were also assessed from the adjacent sound teeth as control. Collected data were then analyzed using P2-test. There was a significant association between the presences of defective restoration and periodontal disease. A similar finding was corresponded to the presence of active carious lesion. This change of the periodontal tissue status was not observed on the sound adjacent teeth. Comparing the different groups for their power of difference, the sound and either carious or faulty restored teeth showed no significant difference between periodontal status of carious and restored teeth (p<0.05). Results of this investigation revealed that faulty restored and carious teeth could develop periodontal disease through out time and any delay in treating such cases would further complicate the case.
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