title: Evaluation of bone loss at single-stage and two-stage implant abutments of fixed partial dentures.
abstract: BACKGROUND
  Fixed partial dentures (FPDs) can be supported on implant abutments only or on single-stage and two-stage implants and teeth.
  
  
  OBJECTIVE
  The purpose of this study was a comparative analysis of bone loss at the single-stage and two-stage implant abutments of fixed partial dentures used to restore missing teeth classified as Class I or Class II according to the Kennedy classification.
  
  
  METHODS
  32 patients were treated by using 49 FPDs supported on implants and teeth worn for 2-6 years. Bone loss at the implant abutments of FPDs was evaluated by one examiner using a special ruler with a measuring scale and images of implants. Measurements were conducted at 26 single-stage implants and 50 two-stage implant abutments based on panoramic radiographs.
  
  
  RESULTS
  Statistical analysis showed that the mean bone loss at implants after 2 years was 0.70 mm +/- 0.50. The mean bone loss at implants after 6 years was 1.73 mm +/- 0.41. The bone loss of the alveolar ridge at the single-stage implants was greater than at the two-stage implants but it was not statistically significant.
  
  
  CONCLUSIONS
  Prosthetic treatment of missing teeth classified as Class I or II according to the Kennedy classification with FPDs may result in bone loss less than 2 mm after 6 years. Both single-stage and two-stage intraosseous implants can be suitable for the implant-prosthetic treatment of patients with alar lack of teeth.
authors: University of Medical Sciences, Department of Prosthodontics, Poznań, Poland. rkoczor@amp.edu.pl
authors: R
authors: R
authors: Koczorowski
authors: A
authors: A
authors: Surdacka
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology; D000044:Dental Abutments / Q000009:adverse effects*; D003758:Dental Implantation, Endosseous / Q000009:adverse effects*; D003830:Denture, Partial, Fixed / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography