title: A follow-up study of maxillary implants supporting an overdenture: clinical and radiographic results.
abstract: OBJECTIVE
  Studies of maxillary overdentures supported by endosseous implants often show a high implant failure rate. The aim of the present investigation was to evaluate clinically and radiographically non-submerged implants supporting an overdenture in the maxilla.
  
  
  METHODS
  Forty-one patients were consecutively admitted for treatment. The standard procedure was to place 4 implants and to mount a U-shaped bar for overdenture connection. When the overdenture was delivered to the patients, peri-implant parameters were recorded and radiographs were taken. All patients were required to follow a maintenance care program. In the context of this study, all patients were clinically examined and the peri-implant parameters were compared. Crestal bone loss was analyzed using linear radiographic measurements. A life table analysis was applied to calculate the cumulative survival rate (CSR).
  
  
  RESULTS
  Three implants failed in the early healing phase, and 3 patients lost 6 implants during the loading period. The 5-year CSR of all implants was 94.2%. The peri-implant parameters gave evidence of healthy soft tissues and good oral hygiene. The increases in probing depths and attachment loss were significant (P < .05). The mean marginal crestal bone loss was about 0.7 mm and was statistically significant at mesial and distal sites (P < .001).
  
  
  CONCLUSIONS
  The correlation between clinical attachment loss and crestal bone loss was not significant. Pronounced marginal bone loss was found around some implants.
  
  
  CONCLUSIONS
  In planned maxillary overdenture treatment, it is possible to achieve a satisfactory survival rate of the implants.
authors.affiliation: Department of Prosthodontics, University of Bern, Switzerland. regina.mericske@zmk.unibe.ch
authors.forename: Regina
authors.initials: R
authors.lastname: Mericske-Stern
authors.forename: Matthias
authors.initials: M
authors.lastname: Oetterli
authors.forename: Peter
authors.initials: P
authors.lastname: Kiener
authors.forename: Ernö
authors.initials: E
authors.lastname: Mericske
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging; D002985:Clinical Protocols; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003779:Denture Design; D003781:Denture Retention; D003828:Denture, Overlay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation / Q000601:surgery; D015993:Life Tables; D008297:Male; D016555:Matched-Pair Analysis; D008437:Maxilla / Q000000981:diagnostic imaging / Q000601:surgery*; D008875:Middle Aged; D009910:Oral Hygiene; D017622:Periodontal Attachment Loss / Q000145:classification; D010514:Periodontal Pocket / Q000145:classification; D011859:Radiography; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D014945:Wound Healing
chemical_list: D015921:Dental Implants