title: Retrospective success and survival rates of dental implants placed after a ridge preservation procedure.
abstract: OBJECTIVE
  Ridge preservation is any procedure that takes place at the time of, or shortly after an extraction, to minimise resorption of the ridge and maximise bone formation within the socket. The aim of this project is to investigate the outcome of implant treatment following ridge preservation and compare it to an ungrafted implant control group.
  
  
  METHODS
  Following ethics approval, an electronic and manual search of patient records was conducted, and appropriate cases of implant placement following a ridge preservation procedure were identified. Forty-two patients with 51 implants at ridge-preserved sites were examined by one author (PA) with the following parameters assessed at each implant: pocket probing depth, bleeding on probing, presence/absence of plaque and radiographic bone loss. Clinical and radiographic findings were compared to an ungrafted implant control group and analysed by years in function.
  
  
  RESULTS
  There was a 100% survival rate of implants in ridge-preserved sites. In the majority of cases, ridge preservation was performed in the anterior maxilla with a flap raised and the use of deproteinised bovine bone mineral and collagen membrane materials. The mean time in function was 31 (±24) months with a range of 2-102 months. Differences in the mean PPD, BOP, plaque index and radiographic bone loss were not statistically significant between implants at ridge-preserved or ungrafted sites. The overall success rate was around 58% for ungrafted implants and around 51% for implants in ridge-preserved sites. However, this difference was not statistically significant.
  
  
  CONCLUSIONS
  In this retrospective study, implant placement at ridge-preserved sites was a predictable procedure that led to very high survival rates and similar success rates to implant placement at ungrafted sites.
authors.affiliation: Periodontics, Melbourne Dental School, Parkville, Vic., Australia.
authors.forename: Peter
authors.initials: P
authors.lastname: Apostolopoulos
authors.affiliation: Periodontics, Melbourne Dental School, Parkville, Vic., Australia.
authors.forename: Ivan
authors.identifier: http://orcid.org/0000-0002-6457-5327
authors.initials: I
authors.lastname: Darby
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000175:diagnosis*; D000540:Alveolar Ridge Augmentation; D016022:Case-Control Studies; D015921:Dental Implants; D003774:Dental Plaque Index; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D010512:Periodontal Index; D011183:Postoperative Complications / Q000175:diagnosis; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: dental implants; ridge preservation; success; survival