title: A 10-year retrospective analysis of radiographic bone-level changes of implants supporting single-unit crowns in periodontally compromised vs. periodontally healthy patients.
abstract: OBJECTIVE
  To compare the 10-year peri-implant bone loss (BL) rate in periodontally compromised (PCP) and periodontally healthy patients (PHP) around two different implant systems supporting single-unit crowns.
  
  
  METHODS
  In this retrospective, controlled study, the mean BL (mBL) rate around dental implants placed in four groups of 20 non-smokers was evaluated after a follow-up of 10 years. Two groups of patients treated for periodontitis (PCP) and two groups of PHP were created. For each category (PCP and PHP), two different types of implant had been selected. The mBL was calculated by subtracting the radiographic bone levels at the time of crown cementation from the bone levels at the 10-year follow-up.
  
  
  RESULTS
  The mean age, mean full-mouth plaque and full-mouth bleeding scores and implant location were similar between the four groups. Implant survival rates ranged between 85% and 95%, without statistically significant differences (P>0.05) between groups. For both implant systems, PCP showed statistically significantly higher mBL rates and number of sites with BL> or =3 mm compared with PHP (P<0.0001).
  
  
  CONCLUSIONS
  After 10 years, implants in PCP yielded lower survival rates and higher mean marginal BL rates compared with those of implants placed in PHP. These results were independent of the implant system used or the healing modality applied.
authors.affiliation: Department of Periodontology, University Federico II, Naples, Italy.
authors.forename: Sergio
authors.initials: S
authors.lastname: Matarasso
authors.forename: Giulio
authors.initials: G
authors.lastname: Rasperini
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Iorio Siciliano
authors.forename: Giovanni E
authors.initials: GE
authors.lastname: Salvi
authors.forename: Niklaus P
authors.initials: NP
authors.lastname: Lang
authors.forename: Marco
authors.initials: M
authors.lastname: Aglietta
mesh_terms: D000367:Age Factors; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging*; D002484:Cementation; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003442:Crowns; D003758:Dental Implantation, Endosseous; D019250:Dental Implants, Single-Tooth; D003764:Dental Materials / Q000737:chemistry; D003774:Dental Plaque Index; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000628:therapy; D010518:Periodontitis / Q000628:therapy*; D058626:Plasma Gases / Q000737:chemistry; D019252:Radiography, Dental, Digital; D012189:Retrospective Studies; D013499:Surface Properties; D016019:Survival Analysis; D014025:Titanium / Q000737:chemistry
chemical_list: D020099:Coated Materials, Biocompatible; D003764:Dental Materials; D058626:Plasma Gases; D014025:Titanium