title: Effect of periodontitis history on implant success: a long-term evaluation during supportive periodontal therapy in a university setting.
abstract: OBJECTIVE
  The aim of this retrospective study was to evaluate the long-term implant survival in patients with a history of chronic periodontitis, during supportive periodontal therapy (SPT), compared to periodontally healthy patients.
  
  
  METHODS
  Twenty-nine periodontitis patients (test) with SPT for ≥9 years and implant-supported restorations (≥5 years follow-up) were recruited and pair-matched with 29 periodontally healthy patients (control). Subjects in both groups were examined following active periodontal therapy and/or implantation (T1) (test 69 implants, control 76 implants) and at end of SPT or supportive postimplant therapy (T2). Differences between the groups in implant survival (primary outcome), mean marginal bone loss (MBL) and pocket probing depths (PPDs) (secondary outcomes) were evaluated.
  
  
  RESULTS
  Implant survival over 5 years was 97.1% in test compared to 97.4% in control group (p = 0.562). MBL was significantly different (test 18.7 ± 18.2%; control 12.5 ± 21.3%) (p < 0.05). PPDs increased at T2 in both groups (test: T1 3.4 ± 1.0 mm; T2 4.2 ± 1.6 mm; control: T1 1.0 ± 1.2 mm; T2 2.9 ± 0.8 mm; p < 0.05 between groups). Prognostic factors for implant loss appeared to be the presence of residual periodontal pockets of ≥4 mm (OR 1.90), bone height (OR 1.81) and age (OR 1.16) at T1.
  
  
  CONCLUSIONS
  In terms of implant survival, no differences were observed between periodontitis and periodontally healthy patients. However, patients with history of periodontitis showed higher MBL and PPDs compared to periodontally healthy patients.
  
  
  CONCLUSIONS
  The presence of a good periodontal maintenance program with preceding successful active periodontal treatment seems to be indispensable components of successful implant treatment in patients with history of chronic periodontitis.
authors.affiliation: Clinic of Conservative Dentistry and Periodontology, University of Kiel, Kiel, Germany. graetz@konspar.uni-kiel.de.
authors.forename: Christian
authors.identifier: http://orcid.org/0000-0002-8316-0565
authors.initials: C
authors.lastname: Graetz
authors.affiliation: Clinic of Conservative Dentistry and Periodontology, University of Kiel, Kiel, Germany.|Oral Medicine and Periodontology Department, Faculty of Oral and Dental Medicine, Cairo University, Giza, Egypt.
authors.forename: Karim Fawzy
authors.initials: KF
authors.lastname: El-Sayed
authors.affiliation: Clinic of Conservative Dentistry and Periodontology, University of Kiel, Kiel, Germany.
authors.forename: Antje
authors.initials: A
authors.lastname: Geiken
authors.affiliation: Clinic of Conservative Dentistry and Periodontology, University of Kiel, Kiel, Germany.
authors.forename: Anna
authors.initials: A
authors.lastname: Plaumann
authors.affiliation: Clinic of Conservative Dentistry and Periodontology, University of Kiel, Kiel, Germany.
authors.forename: Sonja
authors.initials: S
authors.lastname: Sälzer
authors.affiliation: Department of Oral and Maxillofacial Surgery, University of Kiel, Kiel, Germany.
authors.forename: Eleonore
authors.initials: E
authors.lastname: Behrens
authors.affiliation: Department of Oral and Maxillofacial Surgery, University of Kiel, Kiel, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Wiltfang
authors.affiliation: Clinic of Conservative Dentistry and Periodontology, University of Kiel, Kiel, Germany.
authors.forename: Christof E
authors.initials: CE
authors.lastname: Dörfer
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D055113:Chronic Periodontitis / Q000150:complications* / Q000628:therapy*; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies
chemical_list: D015921:Dental Implants
keywords: Bone loss; Implant loss; Periodontitis; Risk factors; Supportive periodontal therapy