{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T02:31:36Z","timestamp":1790303496860,"version":"4.1.0"},"reference-count":35,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2007,8,1]],"date-time":"2007-08-01T00:00:00Z","timestamp":1185926400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Periodontology"],"published-print":{"date-parts":[[2007,8]]},"abstract":"<jats:p><jats:bold>Background:<\/jats:bold> Developmental and morphological abnormalities may contribute to the progression of localized periodontal disease. Although the presence of a disto\u2010lingual root in the mandibular first molar is rare, its role in periodontal destruction has not been examined. The purpose of this study was to evaluate whether the presence of this root contributes to localized periodontal destruction.<\/jats:p><jats:p><jats:bold>Methods:<\/jats:bold> The presence of the disto\u2010lingual root was identified by examination of two periapical radiographs in each of 197 Taiwanese patients with 332 mandibular first molars. Regression analysis was used to evaluate the relationship between the presence of the root and probing depth, gingival recession, and periodontal attachment loss at the disto\u2010buccal and disto\u2010lingual sites of the molars. The adjusted variables included patient characteristics (age, gender, diagnosis, and general periodontal conditions), tooth (right and left location, tooth mobility, and periodontal category of the molar), and site (bleeding on probing and adjacent furcation involvement).<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold> A disto\u2010lingual root was present in 26.9% of patients and in 21.7% of molars examined. A significant interaction between periodontal category and the presence of disto\u2010lingual root on probing depth and attachment loss at disto\u2010lingual but not disto\u2010buccal sites was observed. Multivariable regression analysis showed a significantly higher probing depth and attachment loss at the disto\u2010lingual site in molars with the disto\u2010lingual root than in molars without the root in teeth classified as having advanced periodontitis.<\/jats:p><jats:p><jats:bold>Conclusions:<\/jats:bold> Greater probing depth and attachment loss occurred at disto\u2010lingual sites of molars with the roots. The presence of a disto\u2010lingual root may contribute to localized periodontal destruction.<\/jats:p>","DOI":"10.1902\/jop.2007.060419","type":"journal-article","created":{"date-parts":[[2007,8,1]],"date-time":"2007-08-01T09:22:59Z","timestamp":1185960179000},"page":"1485-1490","source":"Crossref","is-referenced-by-count":46,"title":["Mandibular Disto\u2010Lingual Root: A Consideration in Periodontal 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