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This study aimed to evaluate the impact of smoking on clinical outcomes of non\u2010surgical periodontal therapy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Electronic databases were searched to screen studies published before May 2020. The included studies had to have two groups: smokers (S) and non\u2010smokers (NS) with periodontitis. The outcomes evaluated were differences between groups in probing depth (PD) reduction and clinical attachment level (CAL) gain after non\u2010surgical periodontal therapy. Meta\u2010regressions were conducted to evaluate correlations between outcomes and other contributing factors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Seventeen studies were included. The post\u2010treatment PD reduction in the S group was smaller than in the NS group (weighted mean difference in PD reduction: \u22120.33\u00a0mm, 95% confidence interval (CI): [\u22120.49, \u22120.17], <jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.01). The CAL gain in the S group was also smaller than in the NS group (weighted mean difference in CAL gain: \u22120.20\u00a0mm, CI: [\u22120.39, \u22120.02], <jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.01). Additionally, baseline PD significantly affected the difference in PD reduction between two groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Smoking negatively impacts clinical responses to non\u2010surgical periodontal therapy. Smokers with periodontitis have significantly less PD reduction and CAL gain than non\u2010smokers.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jcpe.13384","type":"journal-article","created":{"date-parts":[[2020,10,6]],"date-time":"2020-10-06T21:50:15Z","timestamp":1602021015000},"page":"61-76","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":54,"title":["The impact of smoking on non\u2010surgical periodontal therapy: A systematic review and meta\u2010analysis"],"prefix":"10.1111","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9315-5500","authenticated-orcid":false,"given":"Jennifer","family":"Chang","sequence":"first","affiliation":[{"name":"Department of Periodontics and Dental Hygiene The University of Texas Health Science Center at Houston School of Dentistry Houston TX USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hsiu\u2010Wan","family":"Meng","sequence":"additional","affiliation":[{"name":"Department of Periodontics and Dental Hygiene The University of Texas Health Science Center at Houston School of Dentistry Houston TX USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evanthia","family":"Lalla","sequence":"additional","affiliation":[{"name":"Division of Periodontics Columbia University College of Dental Medicine New York, NY USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7812-5637","authenticated-orcid":false,"given":"Chun\u2010Teh","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Periodontics and Dental Hygiene The University of Texas Health Science Center at Houston School of Dentistry Houston TX USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,11,5]]},"reference":[{"key":"e_1_2_9_2_1","article-title":"Frequency of Porphyromonas gingivalis fimA in smokers and nonsmokers after periodontal therapy","volume":"27","author":"Abreu M. 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