{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T13:16:19Z","timestamp":1768914979089,"version":"3.49.0"},"reference-count":36,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2021,9,7]],"date-time":"2021-09-07T00:00:00Z","timestamp":1630972800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["aap.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Periodontology"],"published-print":{"date-parts":[[2022,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>The British Society of Periodontology (BSP) implemented a simplified version of the 2017 World Workshop Classification (WWC) on staging and grading of periodontitis, for use in UK clinical practice. The aim of this study was to assess the long\u2010term (<jats:italic>&gt;<\/jats:italic>10 years) prognostic capability of BSP's implementation (BSP\u2010i) compared with the 2017 WWC, using periodontal\u2010related tooth loss (TLP) as a disease outcome.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Data on medical history, smoking status, and clinical periodontal parameters were retrieved from 270 patients who received non\u2010surgical and surgical periodontal therapy from 1966 to 2007. Each patient received a baseline diagnosis according to the 2017 WWC and the BSP\u2010i guidelines for implementation. Univariate multilevel Cox regression frailty models were performed to analyze the association between variables with TLP. A post\u2010hoc comparison with Bonferroni correction was performed to analyze interclass comparisons. The prognostic performance of both systems was analyzed using Harrell C index.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The prognostic performance of both systems was very similar (0.922 for the 2017 WWC and 0.925 for the BSP\u2010i). The singular prognostic performance of BSP stage was slightly higher than that of 2017 WWC stage (0.9212\u00a0versus 0.9188), while the 2017 WWC grade showed a slightly better performance than BSP grade (0.9175\u00a0versus 0.9155). BSP\u2010i's extent performed better than the 2017 WWC extent (0.9203\u00a0versus 0.9098); however, in the 2017 WWC extent, the class \u201clocalized\u201d was associated with a better prognosis than \u201cgeneralized.\u201d<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The overall prognostic performance of the two systems was excellent, with both systems having a Harrell C index score of &gt;0.92.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jper.21-0296","type":"journal-article","created":{"date-parts":[[2021,7,27]],"date-time":"2021-07-27T13:07:02Z","timestamp":1627391222000},"page":"537-547","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Prognostic performance of the 2017 World Workshop classification on staging and grading of periodontitis compared with the British Society of Periodontology's implementation"],"prefix":"10.1002","volume":"93","author":[{"given":"Himabindu","family":"Dukka","sequence":"first","affiliation":[{"name":"Department of Periodontics University of Louisville School of Dentistry  Louisville Kentucky USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas","family":"Dietrich","sequence":"additional","affiliation":[{"name":"Department of Periodontology, School of Dentistry University of Birmingham  Birmingham UK"},{"name":"Birmingham Community Health Foundation NHS Trust  Birmingham UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Muhammad H. A.","family":"Saleh","sequence":"additional","affiliation":[{"name":"Department of Periodontics University of Louisville School of Dentistry  Louisville Kentucky USA"},{"name":"Department of Periodontics and Oral Medicine University of Michigan School of Dentistry  Ann Arbor Michigan USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5647-4414","authenticated-orcid":false,"given":"Giuseppe","family":"Troiano","sequence":"additional","affiliation":[{"name":"Department of Clinical and Experimental Medicine University of Foggia  Foggia Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zehra","family":"Yonel","sequence":"additional","affiliation":[{"name":"Department of Periodontology, School of Dentistry University of Birmingham  Birmingham UK"},{"name":"Birmingham Community Health Foundation NHS Trust  Birmingham UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrea","family":"Ravid\u00e0","sequence":"additional","affiliation":[{"name":"Department of Periodontics and Oral Medicine University of Michigan School of Dentistry  Ann Arbor Michigan USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4238-1799","authenticated-orcid":false,"given":"Hom\u2010Lay","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Periodontics and Oral Medicine University of Michigan School of Dentistry  Ann Arbor Michigan USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Henry","family":"Greenwell","sequence":"additional","affiliation":[{"name":"Department of Periodontics University of Louisville School of Dentistry  Louisville Kentucky USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Iain L. 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