Oral Biology Research
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Nam B, Ko E, Jeong S.  Comparison of tooth loss after periodontal treatment using the 1999 and 2018 systems of periodontal disease classification: a retrospective longitudinal study with over five years of follow-up.  Oral Biol Res 2023;47:15-21.  https://doi.org/10.21851/obr.47.01.202303.15
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