title: Early-loaded one-stage implants retaining mandibular overdentures by two different mechanisms: 5-year results.
abstract: OBJECTIVE
  To compare the biologic and prosthetic outcomes of implants loaded early to retain mandibular overdentures by means of two different attachment systems.
  
  
  METHODS
  Patients were screened according to specific inclusion/exclusion criteria and randomly allocated to treatment groups involving two-implant-supported early loaded mandibular overdentures retained by ball attachments or Locator attachments. Marginal bone loss, Plaque Index, peri-implant infection, Bleeding Index, prosthetic complications, and Kaplan-Meier survival estimates of the groups were assessed at the 5-year recall.
  
  
  RESULTS
  Among the 29 patients (58 implants) who completed the study, one implant was lost during healing; all implants survived after prosthesis delivery. Bone loss in the ball attachment group (0.77 ± 0.05 mm) was significantly greater than that in the Locator group (0.59 ± 0.03 mm). The Plaque and Bleeding indices of both groups were comparable, and peri-implant inflammation scores in both groups were zero for all implants. The frequencies of activation of the matrix, replacement of the matrix, and denture reline in the ball attachment group were significantly higher than those observed in the Locator group. While assessments for the absence of any complication showed that the 1- and 3-year Kaplan-Meier survival probabilities of both groups were comparable, when activation of the retainer was excluded, survival probabilities of the ball attachment group were higher.
  
  
  CONCLUSIONS
  The biologic outcomes of early loaded mandibular overdentures retained by ball attachments or Locators were comparable. Although the frequency of prosthetic complications with ball attachments was higher, this did not decrease the survival probability for the treatment.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Hazettepe University, Ankara, Turkey. akcak@hacettepe.edu.tr
authors.forename: Kivanç
authors.initials: K
authors.lastname: Akça
authors.forename: Yeliz
authors.initials: Y
authors.lastname: Çavuşoğlu
authors.forename: Elçin
authors.initials: E
authors.lastname: Sağirkaya
authors.forename: Murat Cavit
authors.initials: MC
authors.lastname: Çehreli
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000209:etiology*; D015921:Dental Implants; D003773:Dental Plaque / Q000175:diagnosis; D003774:Dental Plaque Index; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects / Q000379:methods*; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible; D008875:Middle Aged
chemical_list: D015921:Dental Implants