{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T13:25:29Z","timestamp":1791465929099,"version":"4.3.4"},"reference-count":22,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2019,6,28]],"date-time":"2019-06-28T00:00:00Z","timestamp":1561680000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Clinic Periodontology"],"published-print":{"date-parts":[[2019,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>We aimed to assess how the 2018 and 1999 classifications of periodontal diseases reflect (a) patients\u2019 characteristics, (b) disease severity\/extent\/progression and (c) tooth loss (TL) during observation period.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total of 251 patients were followed over 21.8\u00a0\u00b1\u00a06.2\u00a0years. For the 1999 classification, using clinical attachment level (CAL), patients were classified as localized\/generalized, mild\/moderate\/severe and aggressive\/chronic periodontitis. For the 2018 classification, patients were staged according to their CAL or bone loss (BL) and the number of lost teeth (stages I\u2013IV). Further factors like probing pocket depths (PPD) or furcation involvement modified the stage. The extent was sub\u2010classified as generalized\/localized. Patients were graded according to the BL\/age index, smoking and\/or diabetes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>According to the 1999 classification, most patients suffered from generalized severe chronic periodontitis (203\/251) or generalized\u00a0aggressive periodontitis (45\/251). Patients with aggressive periodontitis were younger and less often female or smokers. They showed similar TL (0.25\u00a0\u00b1\u00a00.22 teeth\/patient*year) as generalized severe chronic periodontitis patients (0.23\u00a0\u00b1\u00a00.25\u00a0teeth\/patient*year). According to the 2018 classification, most patients were classified as generalized III\u2010C (140\/251), III\u2010B (31\/251) or IV\u2010C (64\/251). Patients\u2019 age, smoking status, CAL, PPD and BL were well reflected. TL differed between IV\u2010C (0.36\u00a0\u00b1\u00a00.47), generalized III\u2010C (0.21\u00a0\u00b1\u00a00.24) and localized forms (0.10\u20130.15).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Patients\u2019 characteristics, disease severity\/extent\/progression and TL were well reflected by the 2018 classification.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jcpe.13157","type":"journal-article","created":{"date-parts":[[2019,6,1]],"date-time":"2019-06-01T14:50:03Z","timestamp":1559400603000},"page":"908-917","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":91,"title":["Comparison of periodontitis patients\u2019 classification in the 2018 versus 1999 classification"],"prefix":"10.1111","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8316-0565","authenticated-orcid":false,"given":"Christian","family":"Graetz","sequence":"first","affiliation":[{"name":"Clinic of Conservative Dentistry and Periodontology University of Kiel Kiel Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucas","family":"Mann","sequence":"additional","affiliation":[{"name":"Clinic of Conservative Dentistry and Periodontology University of Kiel Kiel Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joachim","family":"Krois","sequence":"additional","affiliation":[{"name":"Department of Operative and Preventive Dentistry Charit\u00e9 University of Berlin Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9099-7750","authenticated-orcid":false,"given":"Sonja","family":"S\u00e4lzer","sequence":"additional","affiliation":[{"name":"Clinic of Conservative Dentistry and Periodontology University of Kiel Kiel Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maren","family":"Kahl","sequence":"additional","affiliation":[{"name":"Clinic of Conservative Dentistry and Periodontology University of Kiel Kiel Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudia","family":"Springer","sequence":"additional","affiliation":[{"name":"Clinic of Conservative Dentistry and Periodontology University of Kiel Kiel Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1223-1669","authenticated-orcid":false,"given":"Falk","family":"Schwendicke","sequence":"additional","affiliation":[{"name":"Department of Operative and Preventive Dentistry Charit\u00e9 University of Berlin Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,6,28]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1902\/annals.1999.4.1.1"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/jcpe.12056"},{"issue":"20","key":"e_1_2_9_4_1","first-page":"S1","article-title":"A new classification scheme for periodontal and peri\u2010implant diseases and conditions \u2010 Introduction and key changes from the 1999 classification","volume":"45","author":"Caton J. 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