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Saravanamuttu, R. Changes in the community periodontal index of treatment needs (CPITN) after periodontal treatment in a general dental practice'. Br Dent J 172, 48 (1992). https://doi.org/10.1038/sj.bdj.4807766
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DOI: https://doi.org/10.1038/sj.bdj.4807766