Objective: The aim of the present study is to assess the oral hygiene of patients with black. Stains caused by chromogenic bacteria and its recurrence rate after scaling and polishing. Materials and Methods: A total of 80 patients of age 15-40 years were included in the study and divided in to two groups. Test group consist of 40 patients with black extrinsic stains and control group consists of 40 patients without any stains. Clinical parameters like Oral Hygiene Index, Plaque index. Lobenes stain index and history of scaling are recorded in the groups. Results: The results were analyzed using Chi- square test which indicated that there is a significant difference in the oral hygiene and plaque scores among patients with and without stains. The patients with stains showed a high recurrence rate within few months after thorough scaling and polishing. Conclusion: The findings of this study conclude that the black chromogenic stains are more prevalent in patients with good oral hygiene and good plaque control. A high rate of recurrence after scaling and polishing were also observed among the subjects.
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