title: Clinical complications of osseointegrated implants.
abstract: BACKGROUND
  There is no comprehensive review of the literature that identifies the complications reported in clinical dental implant studies.
  
  
  OBJECTIVE
  This article attempted to determine the types of complications that have been reported and to provide data regarding their frequency.
  
  
  METHODS
  All available clinical studies from 1981 to 1997, published in English or with English abstract, that presented success/failure data regarding implant treatment were evaluated to determine the types of reported complications and to quantify implant loss as it relates to type of prosthesis, arch, time, implant length, and bone quality.
  
  
  RESULTS
  Greater implant loss occurred with overdentures than with other types of prostheses. There was greater loss in the maxilla than mandible with fixed complete dentures and overdentures, whereas little arch difference was noted with fixed partial dentures. Implant loss increased with short implants and poor bone quality. The time of implant loss (preprosthetic vs postprosthetic) varied with type of prosthesis. Surgical complications included neurosensory disturbance, hematoma, mandibular fracture, hemorrhage, and tooth devitalization. Initial and long-term marginal bone changes were identified. Peri-implant soft tissue complications included dehiscence, fistulas, and gingival inflammation/proliferation. Mechanical complications were screw loosening/fracture, implant fractures, framework, resin base and veneering material fractures, opposing prosthesis fractures, and overdenture mechanical retention problems. Some studies also presented phonetic and esthetic complications.
  
  
  CONCLUSIONS
  Although the literature presents considerable information on implant complications, variations in study design and reporting procedures limited the available data and therefore precluded proper analysis of certain complications.
authors.affiliation: School of Dentistry, Loma Linda University, Loma Linda, CA, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Goodacre
authors.forename: J Y
authors.initials: JY
authors.lastname: Kan
authors.forename: K
authors.initials: K
authors.lastname: Rungcharassaeng
mesh_terms: D003724:Dental Arch / Q000473:pathology; D003758:Dental Implantation, Endosseous / Q000009:adverse effects* / Q000145:classification; D015921:Dental Implants / Q000009:adverse effects* / Q000145:classification; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003824:Denture, Complete / Q000009:adverse effects; D003828:Denture, Overlay / Q000009:adverse effects; D003830:Denture, Partial, Fixed / Q000009:adverse effects; D006801:Humans; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants